Merge remote-tracking branch 'origin/master'

# Conflicts:
#	app/src/main/java/org/secuso/privacyfriendlysudoku/ui/GameActivity.java

app/src/main/java/org/secuso/privacyfriendlysudoku/controller/GameController.java

@@ -3,11 +3,15 @@ package org.secuso.privacyfriendlysudoku.controller;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.os.Handler;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.util.Log;
 
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Timer;
 import java.util.TimerTask;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 import org.secuso.privacyfriendlysudoku.controller.helper.GameInfoContainer;
 import org.secuso.privacyfriendlysudoku.game.CellConflict;
@@ -26,7 +30,7 @@ import org.secuso.privacyfriendlysudoku.game.listener.ITimerListener;
 /**
  * Created by Chris on 06.11.2015.
  */
-public class GameController implements IModelChangedListener {
+public class GameController implements IModelChangedListener, Parcelable {
 
     // General
     private SharedPreferences settings;
@@ -50,7 +54,7 @@ public class GameController implements IModelChangedListener {
     private int sectionWidth;
     private int usedHints = 0;
     private GameBoard gameBoard;
-    private int[] solution;
+    private int[] solution = new int[0];
     private GameType gameType;
     private GameDifficulty difficulty;
     private CellConflictList errorList = new CellConflictList();
@@ -63,11 +67,12 @@ public class GameController implements IModelChangedListener {
 
     // Timer
     private int time = 0;
-    private boolean timerRunning = false;
+    private AtomicBoolean timerRunning = new AtomicBoolean(false);
     private LinkedList<ITimerListener> timerListeners = new LinkedList<>();
     private Handler timerHandler = new Handler();
     private Timer timer = new Timer();
     private TimerTask timerTask;
+
     private boolean noteStatus = false;
 
     // Constructors
@@ -155,7 +160,7 @@ public class GameController implements IModelChangedListener {
 
     public int[] solve() {
 
-        if(solution == null) {
+        if(solution == null || solution.length == 0) {
             solution = qqWingController.solve(gameBoard);
         }
         return solution;
@@ -464,7 +469,7 @@ public class GameController implements IModelChangedListener {
     }
 
     public void deleteSelectedCellsValue() {
-        if(isValidCellSelected() && getSelectedCellsValue() != 0) {
+        if(isValidCellSelected()) {
             deleteValue(selectedRow, selectedCol);
             // add state to undo
             undoRedoManager.addState(gameBoard);
@@ -584,31 +589,40 @@ public class GameController implements IModelChangedListener {
         return usedHints;
     }
 
-    private void initTimer() {
+    public void initTimer() {
+        deleteTimer();
+
         timerTask = new TimerTask() {
             @Override
             public void run() {
                 timerHandler.post(new Runnable() {
                     @Override
                     public void run() {
-                        if(timerRunning) {
+                        if(timerRunning.get()) {
                             notifyTimerListener(time++);
+                            //Log.d("Timer", "calling notifyTimerListener(" + time + ");");
                         }
                     }
                 });
             }
         };
         timer = new Timer();
-        timer.scheduleAtFixedRate(timerTask,0,1000);
+        timer.scheduleAtFixedRate(timerTask, 0, 1000);
+    }
+
+    public void deleteTimer() {
+        pauseTimer();
+        timer.cancel();
+        timer.purge();
     }
 
     public void startTimer() {
-        timerRunning = true;
+        timerRunning.set(true);
         notifyHighlightChangedListeners();
     }
 
     public void pauseTimer(){
-        timerRunning = false;
+        timerRunning.set(false);
     }
 
     public void ReDo() {
@@ -665,4 +679,92 @@ public class GameController implements IModelChangedListener {
         }, 0);
     }
 
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel out, int flags) {
+
+        // get the gamecontroller a new context
+        out.writeInt(selectedRow);
+        out.writeInt(selectedCol);
+        out.writeInt(selectedValue);
+        out.writeInt(highlightValue);
+        out.writeInt(gameID);
+        out.writeInt(size);
+        out.writeInt(sectionHeight);
+        out.writeInt(sectionWidth);
+        out.writeInt(usedHints);
+        out.writeInt(time);
+
+        out.writeInt(solution.length);
+        out.writeIntArray(solution);
+
+        out.writeInt(noteStatus ? 1 : 0);
+        out.writeInt(notifiedOnSolvedListeners ? 1 : 0);
+
+        out.writeParcelable(gameType, 0);
+        out.writeParcelable(difficulty, 0);
+        out.writeParcelable(gameBoard, 0);
+        out.writeParcelable(undoRedoManager, 0);
+
+        // delete lists, in case we get the same object back from Parcel
+        removeAllListeners();
+
+    }
+
+    public static final Parcelable.Creator<GameController> CREATOR = new Parcelable.Creator<GameController>() {
+        public GameController createFromParcel(Parcel in) {
+            return new GameController(in);
+        }
+
+        public GameController[] newArray(int size) {
+            return new GameController[size];
+        }
+    };
+
+    /** recreate object from parcel */
+    private GameController(Parcel in) {
+
+        selectedRow = in.readInt();
+        selectedCol = in.readInt();
+        selectedValue = in.readInt();
+        highlightValue = in.readInt();
+        gameID = in.readInt();
+        size = in.readInt();
+        sectionHeight = in.readInt();
+        sectionWidth = in.readInt();
+        usedHints = in.readInt();
+        time = in.readInt();
+
+        solution = new int[in.readInt()];
+        in.readIntArray(solution);
+
+        noteStatus = in.readInt() == 1;
+        notifiedOnSolvedListeners = in.readInt() == 1;
+
+        gameType = in.readParcelable(GameType.class.getClassLoader());
+        difficulty = in.readParcelable(GameDifficulty.class.getClassLoader());
+        gameBoard = in.readParcelable(GameBoard.class.getClassLoader());
+        undoRedoManager = in.readParcelable(UndoRedoManager.class.getClassLoader());
+
+        removeAllListeners();
+
+        gameBoard.removeAllListeners();
+        gameBoard.registerOnModelChangeListener(this);
+    }
+
+    public void removeAllListeners() {
+        highlightListeners = new LinkedList<>();
+        solvedListeners = new LinkedList<>();
+        hintListener = new LinkedList<>();
+        timerListeners = new LinkedList<>();
+    }
+
+    public void setContextAndSettings(Context applicationContext, SharedPreferences sharedPref) {
+        context = applicationContext;
+        setSettings(sharedPref);
+    }
 }

app/src/main/java/org/secuso/privacyfriendlysudoku/controller/QQWingController.java

@@ -1,5 +1,6 @@
 package org.secuso.privacyfriendlysudoku.controller;
 
+import android.os.Parcelable;
 import android.util.Log;
 
 import java.util.LinkedList;

app/src/main/java/org/secuso/privacyfriendlysudoku/controller/UndoRedoManager.java

@@ -1,5 +1,8 @@
 package org.secuso.privacyfriendlysudoku.controller;
 
+import android.os.Parcel;
+import android.os.Parcelable;
+
 import java.util.LinkedList;
 
 import org.secuso.privacyfriendlysudoku.game.GameBoard;
@@ -7,7 +10,7 @@ import org.secuso.privacyfriendlysudoku.game.GameBoard;
 /**
  * Created by Chris on 24.11.2015.
  */
-public class UndoRedoManager {
+public class UndoRedoManager implements Parcelable {
 
     private int activeState;
     private LinkedList<GameBoard> states = new LinkedList<>();
@@ -78,4 +81,33 @@ public class UndoRedoManager {
             e.printStackTrace();
         }
     }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel out, int flags) {
+        out.writeInt(activeState);
+        out.writeTypedList(states);
+    }
+
+    public static final Parcelable.Creator<UndoRedoManager> CREATOR
+            = new Parcelable.Creator<UndoRedoManager>() {
+        public UndoRedoManager createFromParcel(Parcel in) {
+            return new UndoRedoManager(in);
+        }
+
+        public UndoRedoManager[] newArray(int size) {
+            return new UndoRedoManager[size];
+        }
+    };
+
+    /** recreate object from parcel */
+    private UndoRedoManager(Parcel in) {
+        activeState = in.readInt();
+        in.readTypedList(states, GameBoard.CREATOR);
+    }
+
 }

app/src/main/java/org/secuso/privacyfriendlysudoku/game/GameBoard.java

@@ -1,5 +1,8 @@
 package org.secuso.privacyfriendlysudoku.game;
 
+import android.os.Parcel;
+import android.os.Parcelable;
+
 import java.util.LinkedList;
 import java.util.List;
 
@@ -8,7 +11,7 @@ import org.secuso.privacyfriendlysudoku.game.listener.IModelChangedListener;
 /**
  * Created by Christopher Beckmann on 06.11.2015.
  */
-public class GameBoard implements Cloneable {
+public class GameBoard implements Cloneable, Parcelable {
 
     //private int id;
     private GameType gameType;
@@ -17,7 +20,6 @@ public class GameBoard implements Cloneable {
     //private List additionalSections
     private int size;
     private GameCell[][] field;
-    private List<IModelChangedListener> modelChangedListeners = new LinkedList<>();
 
     public GameBoard(GameType gameType) {
         this.gameType = gameType;
@@ -220,7 +222,6 @@ public class GameBoard implements Cloneable {
     }
 
     public void registerOnModelChangeListener(final IModelChangedListener listener) {
-        if(!modelChangedListeners.contains(listener)) {
             actionOnCells(new ICellAction<Boolean>() {
                 @Override
                 public Boolean action(GameCell gc, Boolean existing) {
@@ -228,22 +229,6 @@ public class GameBoard implements Cloneable {
                     return existing;
                 }
             }, false);
-            modelChangedListeners.add(listener);
-        }
-    }
-
-    public void deleteOnModelChangeListener(final IModelChangedListener listener) {
-        if(modelChangedListeners.contains(listener)) {
-            actionOnCells(new ICellAction<Boolean>() {
-
-                @Override
-                public Boolean action(GameCell gc, Boolean existing) {
-                    gc.removeOnModelChangeListener(listener);
-                    return existing;
-                }
-            }, false);
-            modelChangedListeners.remove(listener);
-        }
     }
 
     @Override
@@ -272,4 +257,58 @@ public class GameBoard implements Cloneable {
         }
         return false;
     }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+
+        dest.writeParcelable(gameType, 0);
+        dest.writeInt(sectionHeight);
+        dest.writeInt(sectionWidth);
+        dest.writeInt(size);
+
+        for(int i = 0; i < field.length; i++) {
+            dest.writeTypedArray(field[i], 0);
+        }
+
+    }
+    public static final Parcelable.Creator<GameBoard> CREATOR
+            = new Parcelable.Creator<GameBoard>() {
+        public GameBoard createFromParcel(Parcel in) {
+            return new GameBoard(in);
+        }
+
+        public GameBoard[] newArray(int size) {
+            return new GameBoard[size];
+        }
+    };
+
+    /** recreate object from parcel */
+    private GameBoard(Parcel in) {
+        //private int id;
+        gameType = in.readParcelable(GameType.class.getClassLoader());
+        sectionHeight = in.readInt();
+        sectionWidth = in.readInt();
+        size = in.readInt();
+
+        field = new GameCell[size][size];
+
+        for(int i = 0; i < field.length; i++) {
+            field[i] = in.createTypedArray(GameCell.CREATOR);
+        }
+    }
+
+    public void removeAllListeners() {
+        actionOnCells(new ICellAction<Boolean>() {
+            @Override
+            public Boolean action(GameCell gc, Boolean existing) {
+                gc.removeAllListeners();
+                return existing;
+            }
+        }, false);
+    }
 }

app/src/main/java/org/secuso/privacyfriendlysudoku/game/GameCell.java

@@ -1,15 +1,22 @@
 package org.secuso.privacyfriendlysudoku.game;
 
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.support.annotation.NonNull;
+
 import java.util.Arrays;
+import java.util.Collection;
+import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.ListIterator;
 
 import org.secuso.privacyfriendlysudoku.game.listener.IModelChangedListener;
 
 /**
  * Created by Chris on 06.11.2015.
  */
-public class GameCell implements Cloneable {
+public class GameCell implements Cloneable, Parcelable {
 
     private int row = 0;
     private int col = 0;
@@ -199,4 +206,49 @@ public class GameCell implements Cloneable {
             m.onModelChange(this);
         }
     }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeInt(row);
+        dest.writeInt(col);
+        dest.writeInt(value);
+        dest.writeInt(size);
+        dest.writeInt(fixed ? 1 : 0);
+        dest.writeInt(noteCount);
+        dest.writeBooleanArray(notes);
+    }
+
+    public static final Parcelable.Creator<GameCell> CREATOR
+            = new Parcelable.Creator<GameCell>() {
+        public GameCell createFromParcel(Parcel in) {
+            return new GameCell(in);
+        }
+
+        public GameCell[] newArray(int size) {
+            return new GameCell[size];
+        }
+    };
+
+    /** recreate object from parcel */
+    private GameCell(Parcel in) {
+        row = in.readInt();
+        col = in.readInt();
+        value = in.readInt();
+        size = in.readInt();
+        fixed = in.readInt() == 1;
+        noteCount = in.readInt();
+        notes = new boolean[size];
+        in.readBooleanArray(notes);
+
+        removeAllListeners();
+    }
+
+    public void removeAllListeners() {
+        modelChangedListeners = new LinkedList<>();
+    }
 }

app/src/main/java/org/secuso/privacyfriendlysudoku/game/GameDifficulty.java

@@ -1,5 +1,7 @@
 package org.secuso.privacyfriendlysudoku.game;
 
+import android.os.Parcel;
+import android.os.Parcelable;
 import android.support.annotation.StringRes;
 
 import java.util.LinkedList;
@@ -9,7 +11,7 @@ import org.secuso.privacyfriendlysudoku.ui.view.R;
 /**
  * Created by Chris on 18.11.2015.
  */
-public enum GameDifficulty {
+public enum GameDifficulty implements Parcelable {
 
     Unspecified(R.string.gametype_unspecified),
     Easy(R.string.difficulty_easy),
@@ -35,4 +37,28 @@ public enum GameDifficulty {
         return validList;
     }
 
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeInt(ordinal());
+        dest.writeInt(resID);
+    }
+
+    public static final Parcelable.Creator<GameDifficulty> CREATOR
+            = new Parcelable.Creator<GameDifficulty>() {
+        public GameDifficulty createFromParcel(Parcel in) {
+            GameDifficulty g = GameDifficulty.values()[in.readInt()];
+            g.resID = in.readInt();
+            return g;
+        }
+
+        public GameDifficulty[] newArray(int size) {
+            return new GameDifficulty[size];
+        }
+    };
+
 }

app/src/main/java/org/secuso/privacyfriendlysudoku/game/GameType.java

@@ -1,5 +1,8 @@
 package org.secuso.privacyfriendlysudoku.game;
 
+import android.os.Parcel;
+import android.os.Parcelable;
+
 import java.util.LinkedList;
 
 import org.secuso.privacyfriendlysudoku.ui.view.R;
@@ -7,14 +10,15 @@ import org.secuso.privacyfriendlysudoku.ui.view.R;
 /**
  * Created by Chris on 09.11.2015.
  */
-public enum GameType {
+public enum GameType implements Parcelable{
     Unspecified(1,1,1,R.string.gametype_unspecified,R.drawable.icon_default_6x6),
     Default_9x9(9,3,3,R.string.gametype_default_9x9,R.drawable.icon_default_9x9),
     Default_12x12(12,3,4,R.string.gametype_default_12x12,R.drawable.icon_default_12x12),
     Default_6x6(6,2,3,R.string.gametype_default_6x6,R.drawable.icon_default_6x6),
     X_9x9(9,3,3,R.string.gametype_x_9x9,R.drawable.icon_default_9x9),
     Hyper_9x9(9,3,3,R.string.gametype_hyper_9x9,R.drawable.icon_default_9x9);
-    //TODO: change pictures for unsepc x9x9 and hyper 9x9 as soon as available
+
+    // change pictures for unsepc x9x9 and hyper 9x9 as soon as available
     int resIDString;
     int sectionWidth;
     int sectionHeight;
@@ -53,4 +57,34 @@ public enum GameType {
         return resIDString;
     }
 
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeInt(ordinal());
+        dest.writeInt(resIDString);
+        dest.writeInt(sectionWidth);
+        dest.writeInt(sectionHeight);
+        dest.writeInt(size);
+        dest.writeInt(resIDImage);
+    }
+
+    public static final Parcelable.Creator<GameType> CREATOR = new Parcelable.Creator<GameType>() {
+        public GameType createFromParcel(Parcel in) {
+            GameType g = GameType.values()[in.readInt()];
+            g.resIDString = in.readInt();
+            g.sectionWidth = in.readInt();
+            g.sectionHeight = in.readInt();
+            g.size = in.readInt();
+            g.resIDImage = in.readInt();
+            return g;
+        }
+
+        public GameType[] newArray(int size) {
+            return new GameType[size];
+        }
+    };
 }

app/src/main/java/org/secuso/privacyfriendlysudoku/ui/GameActivity.java

@@ -8,8 +8,10 @@ import android.app.DialogFragment;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.content.res.Configuration;
 import android.graphics.Point;
 import android.os.Bundle;
+import android.os.Parcelable;
 import android.preference.PreferenceActivity;
 import android.preference.PreferenceManager;
 import android.support.design.widget.NavigationView;
@@ -24,6 +26,7 @@ import android.view.MenuItem;
 import android.view.View;
 import android.view.WindowManager;
 import android.widget.Button;
+import android.widget.LinearLayout;
 import android.widget.RatingBar;
 import android.widget.TextView;
 import android.widget.Toast;
@@ -66,25 +69,48 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+
+        SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
         GameType gameType = GameType.Unspecified;
         GameDifficulty gameDifficulty = GameDifficulty.Unspecified;
         int loadLevelID = 0;
         boolean loadLevel = false;
 
-        Bundle extras = getIntent().getExtras();
+        if(savedInstanceState == null) {
-        if (extras != null) {
+
-            Object o = extras.get("gameType");
+            Bundle extras = getIntent().getExtras();
-            if(o instanceof GameType) {
+            if (extras != null) {
-                gameType = (GameType)extras.get("gameType");
+                Object o = extras.get("gameType");
+                if (o instanceof GameType) {
+                    gameType = (GameType) extras.get("gameType");
+                }
+                gameDifficulty = (GameDifficulty) (extras.get("gameDifficulty"));
+                loadLevel = extras.getBoolean("loadLevel", false);
+                if (loadLevel) {
+                    loadLevelID = extras.getInt("loadLevelID");
+                }
             }
-            gameDifficulty = (GameDifficulty)(extras.get("gameDifficulty"));
+
-            loadLevel = extras.getBoolean("loadLevel", false);
+            gameController = new GameController(sharedPref, getApplicationContext());
-            if(loadLevel) {
+
-                loadLevelID = extras.getInt("loadLevelID");
+            List<GameInfoContainer> loadableGames = GameStateManager.getLoadableGameList();
+
+            if (loadLevel && loadableGames.size() > loadLevelID) {
+                // load level from GameStateManager
+                gameController.loadLevel(loadableGames.get(loadLevelID));
+            } else {
+                // load a new level
+                gameController.loadNewLevel(gameType, gameDifficulty);
             }
+        } else {
+            gameController = savedInstanceState.getParcelable("gameController");
+            // in case we get the same object back
+            // because parceling the Object does not always parcel it. Only if needed.
+            gameController.removeAllListeners();
+            gameController.setContextAndSettings(getApplicationContext(), sharedPref);
+            gameSolved = savedInstanceState.getInt("gameSolved") == 1;
         }
 
-        SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
 
         setContentView(R.layout.activity_game_view);
         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
@@ -93,19 +119,9 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
 
         //Create new GameField
         layout = (SudokuFieldLayout)findViewById(R.id.sudokuLayout);
-        gameController = new GameController(sharedPref, getApplicationContext());
         gameController.registerGameSolvedListener(this);
         gameController.registerTimerListener(this);
         statistics.setGameController(gameController);
-        List<GameInfoContainer> loadableGames = GameStateManager.getLoadableGameList();
-
-        if(loadLevel && loadableGames.size() > loadLevelID) {
-            // load level from GameStateManager
-            gameController.loadLevel(loadableGames.get(loadLevelID));
-        } else {
-            // load a new level
-            gameController.loadNewLevel(gameType, gameDifficulty);
-        }
 
         layout.setSettingsAndGame(sharedPref, gameController);
 
@@ -118,13 +134,16 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
         Point p = new Point();
         getWindowManager().getDefaultDisplay().getSize(p);
 
-        //int width = p.x;
+        // set keyboard orientation
-        keyboard.setKeyBoard(gameController.getSize(), p.x,layout.getHeight()-p.y);
+        int orientation = getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT ?
+                LinearLayout.HORIZONTAL : LinearLayout.VERTICAL;
+
+        keyboard.setKeyBoard(gameController.getSize(), p.x,layout.getHeight()-p.y, orientation);
 
 
         //set Special keys
         specialButtonLayout = (SudokuSpecialButtonLayout) findViewById(R.id.sudokuSpecialLayout);
-        specialButtonLayout.setButtons(p.x, gameController, keyboard, getFragmentManager());
+        specialButtonLayout.setButtons(p.x, gameController, keyboard, getFragmentManager(), orientation);
 
         //set TimerView
         timerView = (TextView)findViewById(R.id.timerView);
@@ -134,7 +153,6 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
         viewName = (TextView) findViewById(R.id.gameModeText);
         viewName.setText(getString(gameController.getGameType().getStringResID()));
 
-
         //set Rating bar
         List<GameDifficulty> difficutyList = GameDifficulty.getValidDifficultyList();
         int numberOfStarts = difficutyList.size();
@@ -154,8 +172,16 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
         NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
         navigationView.setNavigationItemSelectedListener(this);
 
-        // start the game
+        if(gameSolved) {
-        gameController.startTimer();
+            layout.setEnabled(false);
+            keyboard.setButtonsEnabled(false);
+            specialButtonLayout.setButtonsEnabled(false);
+            gameController.pauseTimer();
+        } else {
+            // start the game
+            gameController.startTimer();
+        }
+        onTick(gameController.getTime());
     }
 
     @Override
@@ -163,12 +189,14 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
         super.onPause();
         if(!gameSolved) {
             gameController.saveGame(this);
-            gameController.pauseTimer();
         }
+        gameController.deleteTimer();
     }
     @Override
     public void onResume(){
         super.onResume();
+        gameController.initTimer();
+
         if(!gameSolved) {
             gameController.startTimer();
         }
@@ -308,6 +336,10 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
         specialButtonLayout.setButtonsEnabled(false);
     }
 
+    @Override
+    public void onTick(int time) {
+
+        //do something not so awesome
     public String timeToString(int time) {
         int seconds = time % 60;
         int minutes = ((time -seconds)/60)%60 ;
@@ -326,6 +358,7 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
         //do something not so awesome
         timerView.setText(timeToString(time));
 
+        if(gameSolved) return;
         // save time
         gameController.saveGame(this);
     }
@@ -378,4 +411,21 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
             return builder.create();
         }
     }
+
+    @Override
+    public void onSaveInstanceState(Bundle savedInstanceState) {
+        // Save the user's current game state
+
+        savedInstanceState.putParcelable("gameController", gameController);
+        savedInstanceState.putInt("gameSolved", gameSolved ? 1 : 0);
+
+        // Always call the superclass so it can save the view hierarchy state
+        super.onSaveInstanceState(savedInstanceState);
+    }
+
+    @Override
+    public void onRestoreInstanceState(Bundle savedInstanceState) {
+        //super.onRestoreInstanceState(savedInstanceState);
+    }
+
 }

app/src/main/java/org/secuso/privacyfriendlysudoku/ui/MainActivity.java

@@ -31,6 +31,7 @@ import android.widget.RatingBar;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import java.io.Serializable;
 import java.util.LinkedList;
 import java.util.List;
 
@@ -176,8 +177,8 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
 
                     // send everything to game activity
                     i = new Intent(this, GameActivity.class);
-                    i.putExtra("gameType", gameType);
+                    i.putExtra("gameType", (Serializable)gameType);
-                    i.putExtra("gameDifficulty", gameDifficulty);
+                    i.putExtra("gameDifficulty", (Serializable)gameDifficulty);
                 } else {
                     newLevelManager.checkAndRestock();
                     Toast t = Toast.makeText(getApplicationContext(), R.string.generating, Toast.LENGTH_SHORT);

app/src/main/java/org/secuso/privacyfriendlysudoku/ui/view/SudokuKeyboardLayout.java

@@ -1,5 +1,6 @@
 package org.secuso.privacyfriendlysudoku.ui.view;
 
+import android.app.Activity;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.util.AttributeSet;
@@ -52,7 +53,7 @@ public class SudokuKeyboardLayout extends LinearLayout implements IHighlightChan
         }
     }
 
-    public void setKeyBoard(int size,int width, int height) {
+    public void setKeyBoard(int size,int width, int height, int orientation) {
         LayoutParams p;
         int number = 0;
         int numberOfButtonsPerRow = (size % 2 == 0) ? size/2 :(size+1)/2;
@@ -60,16 +61,19 @@ public class SudokuKeyboardLayout extends LinearLayout implements IHighlightChan
 
         buttons = new SudokuButton[numberOfButtons];
 
-
         //set layout parameters and init Layouts
         for (int i = 0; i < 2; i++) {
-            p = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,0,1);
+            if(orientation == LinearLayout.HORIZONTAL) {
+                p = new LayoutParams(LayoutParams.MATCH_PARENT, 0, 1);
+            } else {
+                p = new LayoutParams(0, LayoutParams.MATCH_PARENT, 1);
+            }
             //if (i == 0) p.bottomMargin=10; else p.topMargin=10;
             p.setMargins(0,5,0,5);
             layouts[i] = new LinearLayout(getContext(),null);
             layouts[i].setLayoutParams(p);
             layouts[i].setWeightSum(numberOfButtonsPerRow);
-            layouts[i].setOrientation(LinearLayout.HORIZONTAL);
+            layouts[i].setOrientation(orientation);
             addView(layouts[i]);
         }
 
@@ -81,7 +85,11 @@ public class SudokuKeyboardLayout extends LinearLayout implements IHighlightChan
             for (int i = 0; i < numberOfButtonsPerRow; i++){
                 int buttonIndex = i + layoutNumber * numberOfButtonsPerRow;
                 buttons[buttonIndex] = new SudokuButton(getContext(),null);
-                p = new LayoutParams(0, LayoutParams.MATCH_PARENT,1);
+                if(orientation == LinearLayout.HORIZONTAL) {
+                    p = new LayoutParams(0, LayoutParams.MATCH_PARENT, 1);
+                } else {
+                    p = new LayoutParams(LayoutParams.MATCH_PARENT, 0, 1);
+                }
                 p.setMargins(5,5,5,5);
                 buttons[buttonIndex].setLayoutParams(p);
                 /* removed GridLayout because of bad scaling will use now a Linearlayout

app/src/main/java/org/secuso/privacyfriendlysudoku/ui/view/SudokuSpecialButtonLayout.java

@@ -58,17 +58,7 @@ public class SudokuSpecialButtonLayout extends LinearLayout implements IHighligh
                         // rotates the Drawable
                         gameController.setNoteStatus(!gameController.getNoteStatus());
                         keyboard.updateNotesEnabled();
-
+                        onHighlightChanged();
-                        bitMap = BitmapFactory.decodeResource(getResources(), btn.getType().getResID());
-                        bitResult = Bitmap.createBitmap(bitMap.getWidth(), bitMap.getHeight(), Bitmap.Config.ARGB_8888);
-
-                        canvas = new Canvas(bitResult);
-                        canvas.rotate(gameController.getNoteStatus() ? 45.0f : 0.0f, bitMap.getWidth()/2, bitMap.getHeight()/2);
-                        canvas.drawBitmap(bitMap, 0, 0, null);
-
-                        btn.setImageBitmap(bitResult);
-                        btn.setBackgroundResource(gameController.getNoteStatus() ? R.drawable.numpad_highlighted_three : R.drawable.numpad_highlighted_four);
-
                         break;
                     case Do:
                         gameController.ReDo();
@@ -113,12 +103,12 @@ public class SudokuSpecialButtonLayout extends LinearLayout implements IHighligh
         }
     }
 
-    public void setButtons(int width, GameController gc, SudokuKeyboardLayout key, FragmentManager fm) {
+    public void setButtons(int width, GameController gc, SudokuKeyboardLayout key, FragmentManager fm, int orientation) {
         fragmentManager = fm;
         keyboard=key;
         gameController = gc;
-        if(gc != null) {
+        if(gameController != null) {
-            gc.registerHighlightChangedListener(this);
+            gameController.registerHighlightChangedListener(this);
         }
         fixedButtons = new SudokuSpecialButton[fixedButtonsCount];
         LayoutParams p;
@@ -126,7 +116,12 @@ public class SudokuSpecialButtonLayout extends LinearLayout implements IHighligh
         //ArrayList<SudokuButtonType> type = (ArrayList<SudokuButtonType>) SudokuButtonType.getSpecialButtons();
         for (SudokuButtonType t : getSpecialButtons()){
             fixedButtons[i] = new SudokuSpecialButton(getContext(),null);
-            p = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT,1);
+            if(orientation == LinearLayout.HORIZONTAL) {
+                p = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1);
+            } else {
+                p = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1);
+                fixedButtons[i].setPadding(25, 0, 25, 0);
+            }
             p.setMargins(5, 5, 5, 5);
 
             //int width2 =width/(fixedButtonsCount);
@@ -166,6 +161,17 @@ public class SudokuSpecialButtonLayout extends LinearLayout implements IHighligh
                     fixedButtons[i].setBackgroundResource(gameController.isRedoAvailable() ?
                             R.drawable.numpad_highlighted_four : R.drawable.inactive_button);
                     break;
+                case NoteToggle:
+                    bitMap = BitmapFactory.decodeResource(getResources(), fixedButtons[i].getType().getResID());
+                    bitResult = Bitmap.createBitmap(bitMap.getWidth(), bitMap.getHeight(), Bitmap.Config.ARGB_8888);
+
+                    canvas = new Canvas(bitResult);
+                    canvas.rotate(gameController.getNoteStatus() ? 45.0f : 0.0f, bitMap.getWidth()/2, bitMap.getHeight()/2);
+                    canvas.drawBitmap(bitMap, 0, 0, null);
+
+                    fixedButtons[i].setImageBitmap(bitResult);
+                    fixedButtons[i].setBackgroundResource(gameController.getNoteStatus() ? R.drawable.numpad_highlighted_three : R.drawable.numpad_highlighted_four);
+                    break;
                 default:
                     break;
             }

app/src/main/res/layout-land/content_game_view.xml

@@ -11,40 +11,42 @@
     app:layout_behavior="@string/appbar_scrolling_view_behavior"
     tools:context="tu_darmstadt.sudoku.activity.GameActivity">
 
-    <org.secuso.privacyfriendlysudoku.ui.view.SudokuFieldLayout
-        android:id="@+id/sudokuLayout"
-        android:layout_width="wrap_content"
-        android:layout_height="match_parent"
-        android:clickable="true"
-        android:gravity="center" />
-
-    <LinearLayout
-        android:layout_width="fill_parent"
-        android:layout_height="fill_parent"
-        android:layout_alignParentRight="@+id/sudokuLayout"
-        android:layout_alignParentEnd="@+id/sudokuLayout"
-        android:orientation="horizontal"
-        android:weightSum="3">
-
-        <org.secuso.privacyfriendlysudoku.ui.view.SudokuKeyboardLayout
-            android:layout_width="0dp"
-            android:layout_height="match_parent"
-            android:id="@+id/sudokuKeyboardLayout"
-            android:orientation="horizontal"
-            android:layout_weight="2"
-            android:weightSum="2">
-
-        </org.secuso.privacyfriendlysudoku.ui.view.SudokuKeyboardLayout>
-
         <org.secuso.privacyfriendlysudoku.ui.view.SudokuSpecialButtonLayout
             android:id="@+id/sudokuSpecialLayout"
-            android:layout_width="0dp"
+            android:layout_width="wrap_content"
+            android:layout_alignParentLeft="true"
+            android:layout_alignParentStart="true"
+            android:layout_marginLeft="15dp"
+            android:layout_marginStart="15dp"
+            android:layout_marginRight="30dp"
+            android:layout_marginEnd="30dp"
             android:orientation="vertical"
             android:layout_height="match_parent"
-            android:layout_weight="1">
+            android:gravity="center"/>
 
-        </org.secuso.privacyfriendlysudoku.ui.view.SudokuSpecialButtonLayout>
+        <org.secuso.privacyfriendlysudoku.ui.view.SudokuFieldLayout
+            android:id="@+id/sudokuLayout"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:layout_toRightOf="@+id/sudokuSpecialLayout"
+            android:layout_toEndOf="@+id/sudokuSpecialLayout"
+            android:minWidth="100dp"
+            android:clickable="true"
+            android:gravity="center" />
 
-    </LinearLayout>
+        <org.secuso.privacyfriendlysudoku.ui.view.SudokuKeyboardLayout
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:layout_marginLeft="30dp"
+            android:layout_marginStart="30dp"
+            android:layout_marginRight="15dp"
+            android:layout_marginEnd="15dp"
+            android:layout_alignParentRight="true"
+            android:layout_alignParentEnd="true"
+            android:layout_toRightOf="@+id/sudokuLayout"
+            android:layout_toEndOf="@+id/sudokuLayout"
+            android:id="@+id/sudokuKeyboardLayout"
+            android:orientation="horizontal"
+            android:weightSum="2"/>
 
 </RelativeLayout>

app/src/main/res/layout-land/fragment_stats.xml

@@ -1,20 +1,104 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
-    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:layout_height="match_parent"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     android:paddingBottom="@dimen/activity_vertical_margin"
-    android:weightSum="10"
+    android:weightSum="5"
     android:orientation="vertical"
     tools:context="tu_darmstadt.sudoku.ui.StatsActivity$PlaceholderFragment">
 
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="0px"
+        android:layout_weight="1"
+        android:orientation="horizontal"
+        android:gravity="center"
+        android:weightSum="3">
+            <LinearLayout
+                android:layout_width="0px"
+                android:layout_weight="1"
+                android:layout_height="wrap_content"
+                android:orientation="vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center"
+                    android:text="@string/number_of_hints"
+                    android:layout_weight="1"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center"
+                    android:text="0"
+                    android:id="@+id/numb_of_hints"
+                    android:layout_weight="1"/>
+            </LinearLayout>
+        <LinearLayout
+            android:layout_width="0px"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+        <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="@string/number_of_games"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="0"
+                android:id="@+id/numb_of_total_games"
+                android:layout_weight="1"/>
+            </LinearLayout>
+        <LinearLayout
+            android:layout_width="0px"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="@string/total_of_time"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="0"
+                android:id="@+id/numb_of_total_time"
+                android:layout_weight="1"/>
+            </LinearLayout>
+    </LinearLayout>
+
     <LinearLayout
         android:layout_width="fill_parent"
         android:layout_height="0dp"
-        android:layout_weight="4"
+        android:layout_weight="0.5">
-        android:weightSum="5">
+        <View
+            android:layout_width="match_parent"
+            android:layout_height="2dp"
+            android:layout_gravity="center_vertical"
+            android:foregroundGravity="center_vertical"
+            android:layout_centerVertical="true"
+            android:layout_centerHorizontal="true"
+            android:background="@color/colorPrimary" />
+
+    </LinearLayout>
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="0px"
+        android:layout_weight="3.5"
+        android:weightSum="9"
+        android:orientation="horizontal">
+
+
         <ImageView
-            android:layout_weight="2"
+            android:layout_weight="3"
             android:layout_width="0dp"
             android:layout_height="fill_parent"
             android:layout_gravity="center"
@@ -37,82 +121,20 @@
                 android:layout_marginBottom="@dimen/activity_horizontal_margin"/>
 
         </RelativeLayout>
+
+
         <LinearLayout
-            android:layout_width="0dp"
+            android:layout_width="0px"
-            android:layout_height="fill_parent"
+            android:layout_height="match_parent"
-            android:weightSum="6"
-            android:layout_weight="2"
             android:orientation="vertical"
-            android:paddingTop="@dimen/activity_horizontal_margin">
+            android:layout_weight="5.5"
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="@string/number_of_hints"
-                android:layout_weight="1"/>
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="0"
-                android:id="@+id/numb_of_hints"
-                android:layout_weight="1"/>
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="@string/number_of_games"
-                android:layout_weight="1"/>
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="0"
-                android:id="@+id/numb_of_total_games"
-                android:layout_weight="1"/>
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="@string/total_of_time"
-                android:layout_weight="1"/>
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="0"
-                android:id="@+id/numb_of_total_time"
-                android:layout_weight="1"/>
-        </LinearLayout>
-    </LinearLayout>
-
-    <LinearLayout
-        android:layout_width="fill_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1">
-        <View
-            android:layout_width="match_parent"
-            android:layout_height="2dp"
-            android:layout_gravity="center_vertical"
-            android:foregroundGravity="center_vertical"
-            android:layout_centerVertical="true"
-            android:layout_centerHorizontal="true"
-            android:background="@color/colorPrimary" />
-
-    </LinearLayout>
-
-    <LinearLayout
-        android:layout_width="fill_parent"
-        android:layout_height="0dp"
-        android:layout_weight="4"
-        android:weightSum="3"
-        android:orientation="vertical">
-        <!-- ### first row -->
-        <LinearLayout
-            android:layout_width="match_parent"
-            android:layout_height="0dp"
-            android:layout_weight="1"
             android:weightSum="3">
+            <!-- ### first row -->
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="0dp"
+                android:layout_weight="1"
+                android:weightSum="3">
             <RelativeLayout
                 android:layout_width="0dp"
                 android:layout_height="fill_parent"
@@ -173,8 +195,8 @@
             </RelativeLayout>
 
         </LinearLayout>
-        <!-- ### second row -->
+            <!-- ### second row -->
-        <LinearLayout
+            <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1"
@@ -238,16 +260,11 @@
                     android:layout_below="@+id/second_min_text"/>
             </RelativeLayout>
         </LinearLayout>
-
+            <!-- ### third row -->
-
+            <LinearLayout
-
+                android:layout_width="match_parent"
-
+                android:layout_height="0dp"
-
+                android:layout_weight="1">
-
-        <LinearLayout
-            android:layout_width="match_parent"
-            android:layout_height="0dp"
-            android:layout_weight="1">
 
             <RelativeLayout
                 android:layout_width="0dp"
@@ -306,11 +323,10 @@
                     android:gravity="center_vertical"
                     android:layout_below="@+id/third_min_text"/>
             </RelativeLayout>
-
+        </LinearLayout>
         </LinearLayout>
 
 
+
     </LinearLayout>
-
-
 </LinearLayout>

app/src/main/res/layout-xlarge-land/fragment_stats.xml

@@ -0,0 +1,316 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
+    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    android:weightSum="10"
+    android:orientation="vertical"
+    tools:context="tu_darmstadt.sudoku.ui.StatsActivity$PlaceholderFragment">
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="0dp"
+        android:layout_weight="4"
+        android:weightSum="5">
+        <ImageView
+            android:layout_weight="2"
+            android:layout_width="0dp"
+            android:layout_height="fill_parent"
+            android:layout_gravity="center"
+            android:id="@+id/statistic_image"
+            android:src="@drawable/icon_default_9x9"
+            android:adjustViewBounds="true"/>
+        <RelativeLayout
+            android:layout_width="0dp"
+            android:layout_height="match_parent"
+            android:layout_weight="1">
+            <View
+                android:layout_width="2dp"
+                android:layout_height="match_parent"
+                android:layout_gravity="center_vertical"
+                android:foregroundGravity="center_vertical"
+                android:layout_centerVertical="true"
+                android:layout_centerHorizontal="true"
+                android:background="@color/colorPrimary"
+                android:layout_marginTop="@dimen/activity_horizontal_margin"
+                android:layout_marginBottom="@dimen/activity_horizontal_margin"/>
+
+        </RelativeLayout>
+        <LinearLayout
+            android:layout_width="0dp"
+            android:layout_height="fill_parent"
+            android:weightSum="6"
+            android:layout_weight="2"
+            android:orientation="vertical"
+            android:paddingTop="@dimen/activity_horizontal_margin">
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="@string/number_of_hints"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="0"
+                android:id="@+id/numb_of_hints"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="@string/number_of_games"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="0"
+                android:id="@+id/numb_of_total_games"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="@string/total_of_time"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="0"
+                android:id="@+id/numb_of_total_time"
+                android:layout_weight="1"/>
+        </LinearLayout>
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1">
+        <View
+            android:layout_width="match_parent"
+            android:layout_height="2dp"
+            android:layout_gravity="center_vertical"
+            android:foregroundGravity="center_vertical"
+            android:layout_centerVertical="true"
+            android:layout_centerHorizontal="true"
+            android:background="@color/colorPrimary" />
+
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="0dp"
+        android:layout_weight="4"
+        android:weightSum="3"
+        android:orientation="vertical">
+        <!-- ### first row -->
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:weightSum="3">
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <RatingBar
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:numStars="3"
+                    android:layout_gravity="center"
+                    android:id="@+id/first_diff_bar"
+                    android:layout_below="@+id/first_diff_text"
+                    style="?android:attr/ratingBarStyleSmall"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="diffi"
+                    android:id="@+id/first_diff_text"
+                    android:gravity="center_vertical"/>
+            </RelativeLayout>
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/average_time"
+                    android:id="@+id/first_av_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/first_ava_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/first_av_text"/>
+            </RelativeLayout>
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/min_time"
+                    android:id="@+id/first_min_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/first_min_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/first_min_text"/>
+            </RelativeLayout>
+
+        </LinearLayout>
+        <!-- ### second row -->
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:weightSum="3">
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <RatingBar
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:numStars="3"
+                    android:layout_gravity="center"
+                    android:id="@+id/second_diff_bar"
+                    android:layout_below="@+id/second_diff_text"
+                    style="?android:attr/ratingBarStyleSmall"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="diffi"
+                    android:id="@+id/second_diff_text"
+                    android:gravity="center_vertical"/>
+            </RelativeLayout>
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/average_time"
+                    android:id="@+id/second_av_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/second_ava_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/second_av_text"/>
+            </RelativeLayout>
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/min_time"
+                    android:id="@+id/second_min_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/second_min_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/second_min_text"/>
+            </RelativeLayout>
+        </LinearLayout>
+
+
+
+
+
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <RatingBar
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:numStars="3"
+                    android:layout_gravity="center"
+                    android:id="@+id/third_diff_bar"
+                    android:layout_below="@+id/third_diff_text"
+                    style="?android:attr/ratingBarStyleSmall"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="diffi"
+                    android:id="@+id/third_diff_text"
+                    android:gravity="center_vertical"/>
+            </RelativeLayout>
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/average_time"
+                    android:id="@+id/third_av_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/third_ava_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/third_av_text"/>
+            </RelativeLayout>
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/min_time"
+                    android:id="@+id/third_min_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/third_min_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/third_min_text"/>
+            </RelativeLayout>
+
+        </LinearLayout>
+
+
+    </LinearLayout>
+
+
+</LinearLayout>

app/src/main/res/layout-xlarge/fragment_stats.xml

@@ -0,0 +1,316 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
+    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    android:weightSum="10"
+    android:orientation="vertical"
+    tools:context="tu_darmstadt.sudoku.ui.StatsActivity$PlaceholderFragment">
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="0dp"
+        android:layout_weight="4"
+        android:weightSum="5">
+        <ImageView
+            android:layout_weight="2"
+            android:layout_width="0dp"
+            android:layout_height="fill_parent"
+            android:layout_gravity="center"
+            android:id="@+id/statistic_image"
+            android:src="@drawable/icon_default_9x9"
+            android:adjustViewBounds="true"/>
+        <RelativeLayout
+            android:layout_width="0dp"
+            android:layout_height="match_parent"
+            android:layout_weight="1">
+            <View
+                android:layout_width="2dp"
+                android:layout_height="match_parent"
+                android:layout_gravity="center_vertical"
+                android:foregroundGravity="center_vertical"
+                android:layout_centerVertical="true"
+                android:layout_centerHorizontal="true"
+                android:background="@color/colorPrimary"
+                android:layout_marginTop="@dimen/activity_horizontal_margin"
+                android:layout_marginBottom="@dimen/activity_horizontal_margin"/>
+
+        </RelativeLayout>
+        <LinearLayout
+            android:layout_width="0dp"
+            android:layout_height="fill_parent"
+            android:weightSum="6"
+            android:layout_weight="2"
+            android:orientation="vertical"
+            android:paddingTop="@dimen/activity_horizontal_margin">
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="@string/number_of_hints"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="0"
+                android:id="@+id/numb_of_hints"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="@string/number_of_games"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="0"
+                android:id="@+id/numb_of_total_games"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="@string/total_of_time"
+                android:layout_weight="1"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="0"
+                android:id="@+id/numb_of_total_time"
+                android:layout_weight="1"/>
+        </LinearLayout>
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1">
+        <View
+            android:layout_width="match_parent"
+            android:layout_height="2dp"
+            android:layout_gravity="center_vertical"
+            android:foregroundGravity="center_vertical"
+            android:layout_centerVertical="true"
+            android:layout_centerHorizontal="true"
+            android:background="@color/colorPrimary" />
+
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="0dp"
+        android:layout_weight="4"
+        android:weightSum="3"
+        android:orientation="vertical">
+        <!-- ### first row -->
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:weightSum="3">
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <RatingBar
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:numStars="3"
+                    android:layout_gravity="center"
+                    android:id="@+id/first_diff_bar"
+                    android:layout_below="@+id/first_diff_text"
+                    style="?android:attr/ratingBarStyleSmall"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="diffi"
+                    android:id="@+id/first_diff_text"
+                    android:gravity="center_vertical"/>
+            </RelativeLayout>
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/average_time"
+                    android:id="@+id/first_av_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/first_ava_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/first_av_text"/>
+            </RelativeLayout>
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/min_time"
+                    android:id="@+id/first_min_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/first_min_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/first_min_text"/>
+            </RelativeLayout>
+
+        </LinearLayout>
+        <!-- ### second row -->
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:weightSum="3">
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <RatingBar
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:numStars="3"
+                    android:layout_gravity="center"
+                    android:id="@+id/second_diff_bar"
+                    android:layout_below="@+id/second_diff_text"
+                    style="?android:attr/ratingBarStyleSmall"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="diffi"
+                    android:id="@+id/second_diff_text"
+                    android:gravity="center_vertical"/>
+            </RelativeLayout>
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/average_time"
+                    android:id="@+id/second_av_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/second_ava_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/second_av_text"/>
+            </RelativeLayout>
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/min_time"
+                    android:id="@+id/second_min_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/second_min_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/second_min_text"/>
+            </RelativeLayout>
+        </LinearLayout>
+
+
+
+
+
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <RatingBar
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:numStars="3"
+                    android:layout_gravity="center"
+                    android:id="@+id/third_diff_bar"
+                    android:layout_below="@+id/third_diff_text"
+                    style="?android:attr/ratingBarStyleSmall"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="diffi"
+                    android:id="@+id/third_diff_text"
+                    android:gravity="center_vertical"/>
+            </RelativeLayout>
+
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/average_time"
+                    android:id="@+id/third_av_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/third_ava_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/third_av_text"/>
+            </RelativeLayout>
+            <RelativeLayout
+                android:layout_width="0dp"
+                android:layout_height="fill_parent"
+                android:layout_weight="1"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/min_time"
+                    android:id="@+id/third_min_text"/>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="0"
+                    android:id="@+id/third_min_time"
+                    android:gravity="center_vertical"
+                    android:layout_below="@+id/third_min_text"/>
+            </RelativeLayout>
+
+        </LinearLayout>
+
+
+    </LinearLayout>
+
+
+</LinearLayout>