From 92c035f860e2cd2bf046a6a32b6dd95eff912364 Mon Sep 17 00:00:00 2001
From: Christopher Beckmann <chris.makas.b@gmail.com>
Date: Tue, 19 Jan 2016 15:15:47 +0100
Subject: [PATCH] Fixed a lot of stuff.. and added ... stuff....... yay.

---
 .../sudoku/controller/GameController.java     |   6 +
 .../sudoku/controller/NewLevelManager.java    |  63 ++++++++++-
 .../tu_darmstadt/sudoku/game/GameBoard.java   |   3 +
 .../tu_darmstadt/sudoku/ui/GameActivity.java  |  76 +++++++++++--
 .../sudoku/ui/LoadGameActivity.java           |   2 +-
 .../tu_darmstadt/sudoku/ui/MainActivity.java  |  15 ++-
 .../tu_darmstadt/sudoku/ui/StatsActivity.java |  22 +++-
 .../listener/IHintDialogFragmentListener.java |   9 ++
 .../IResetDialogFragmentListener.java         |   9 ++
 .../sudoku/ui/view/SudokuKeyboardLayout.java  |  10 ++
 .../ui/view/SudokuSpecialButtonLayout.java    |  66 ++++++++++-
 .../main/res/layout/activity_game_view.xml    | 103 +++++++++++++++---
 .../main/res/layout/activity_main_menu.xml    |  37 ++++---
 app/src/main/res/layout/app_bar_game_view.xml |  75 -------------
 app/src/main/res/layout/fragment_stats.xml    |  13 +--
 app/src/main/res/menu/menu_drawer.xml         |  18 +--
 app/src/main/res/menu/menu_drawer_main.xml    |  20 ++--
 app/src/main/res/values-de/strings.xml        |   2 +-
 app/src/main/res/values/dimens.xml            |   2 +-
 app/src/main/res/values/strings.xml           |  31 ++++--
 app/src/main/res/xml/pref_general.xml         |   2 +-
 21 files changed, 408 insertions(+), 176 deletions(-)
 create mode 100644 app/src/main/java/tu_darmstadt/sudoku/ui/listener/IHintDialogFragmentListener.java
 create mode 100644 app/src/main/java/tu_darmstadt/sudoku/ui/listener/IResetDialogFragmentListener.java
 delete mode 100644 app/src/main/res/layout/app_bar_game_view.xml

diff --git a/app/src/main/java/tu_darmstadt/sudoku/controller/GameController.java b/app/src/main/java/tu_darmstadt/sudoku/controller/GameController.java
index b529954..78bb19f 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/controller/GameController.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/controller/GameController.java
@@ -166,6 +166,9 @@ public class GameController implements IModelChangedListener {
     }*/
 
     public void hint(){
+        if(!isValidCellSelected()) {
+            return;
+        }
 
         int[] solved = solve();
         // TODO test every placed value so far
@@ -302,6 +305,7 @@ public class GameController implements IModelChangedListener {
     public void resetLevel() {
         gameBoard.reset();
         //notifyListeners();
+        notifyHighlightChangedListeners();
     }
 
     public boolean deleteValue(int row, int col) {
@@ -620,6 +624,8 @@ public class GameController implements IModelChangedListener {
                 }
             }
         }
+
+        notifyHighlightChangedListeners();
         return;
     }
 
diff --git a/app/src/main/java/tu_darmstadt/sudoku/controller/NewLevelManager.java b/app/src/main/java/tu_darmstadt/sudoku/controller/NewLevelManager.java
index 0ad9e20..514f761 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/controller/NewLevelManager.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/controller/NewLevelManager.java
@@ -139,7 +139,6 @@ public class NewLevelManager {
             return resultPuzzle;
         }
 
-        // TODO: make the UI wait. Or just generate a level now.
         return null;
     }
 
@@ -147,6 +146,67 @@ public class NewLevelManager {
         new AsyncGenerationTask().execute();
     }
 
+    public void loadFirstStartLevels() {
+        // Default_9x9
+        // Default_12x12
+        // Default_6x6
+
+        // Easy
+        // Moderate
+        // Hard
+
+        // 0
+        // 1
+
+        saveToFile(GameType.Default_9x9, GameDifficulty.Easy, 0, "000208090027000000000400000090100706408090201000030080200001000100300469000000007");
+        saveToFile(GameType.Default_9x9, GameDifficulty.Easy, 1, "000000052000003007500206830002040700070000046640508003000400000000005000050301008");
+        saveToFile(GameType.Default_9x9, GameDifficulty.Moderate, 0, "000800400008004093009003060000700000000400000060002900091000670200000100403006802");
+        saveToFile(GameType.Default_9x9, GameDifficulty.Moderate, 1, "000006040000050000600040080043000200500810000100300605209080460004500000001030000");
+        saveToFile(GameType.Default_9x9, GameDifficulty.Hard, 0, "086000000000000070090000304968027030000100060200900000072006100000000296000000740");
+        saveToFile(GameType.Default_9x9, GameDifficulty.Hard, 1, "450900001001400000600010004006700000500000000100024060002000030000062400040005700");
+
+        saveToFile(GameType.Default_12x12, GameDifficulty.Easy, 0, "B30050A100701600070030800002894000007008000000B550100004020300B0000090000060000A010000000032050C0407008006A000000000400001000C290000000008005000");
+        saveToFile(GameType.Default_12x12, GameDifficulty.Easy, 1, "00B4008A09C002A030C00008007850003000030C000408AB000B00052000000000000070069500030C00B00010467000008000000A100000000800000C0020700001700000095400");
+        saveToFile(GameType.Default_12x12, GameDifficulty.Moderate, 0, "00600500000004000000002050004C00800A28049000050000A900C000000000B00000A00B0560000C900C708A00000B0002000000769000008000B002B0C6000017C00107400908");
+        saveToFile(GameType.Default_12x12, GameDifficulty.Moderate, 1, "020000B000A608070530000B9050200A03800030980010B001000B6C30900000032000CAB0000000000000067000B000000500000A000C09000081302B0100070950836000100000");
+        saveToFile(GameType.Default_12x12, GameDifficulty.Hard, 0, "2000000000000B070C00000000AC100000000020050CA00BB60002097800079001000C60400000B0070A0000A7000298005048000010004000070009A10600C00B000C00B0000020");
+        saveToFile(GameType.Default_12x12, GameDifficulty.Hard, 1, "01000002000C00640A800070000A0000082020000008100B0C081090000050A0060C079009BC000A04010500097000000000000000000000904000866070B100020000000C00B009");
+
+        saveToFile(GameType.Default_6x6, GameDifficulty.Easy, 0, "000000050004013000004003006050040010");
+        saveToFile(GameType.Default_6x6, GameDifficulty.Easy, 1, "000450000600104306630000060005010000");
+        saveToFile(GameType.Default_6x6, GameDifficulty.Moderate, 0, "630010002000001000040020400006003040");
+        saveToFile(GameType.Default_6x6, GameDifficulty.Moderate, 1, "000000060130006000050603030005000041");
+        saveToFile(GameType.Default_6x6, GameDifficulty.Hard, 0, "004200200000003002600050300400046000");
+        saveToFile(GameType.Default_6x6, GameDifficulty.Hard, 1, "003050200003502000000000640002000045");
+    }
+
+    /** Don't use this if you don't know what you are doing! **/
+    private void saveToFile(GameType gameType, GameDifficulty gameDifficulty, int saveNumber, String puzzle) {
+        StringBuilder sb = new StringBuilder();
+        sb.append(LEVEL_PREFIX);
+        sb.append(gameType.name());
+        sb.append("_");
+        sb.append(gameDifficulty.name());
+        sb.append("_");
+        sb.append(saveNumber);
+        sb.append(FILE_EXTENSION);
+        // create the file
+        File file = new File(DIR, sb.toString());
+
+        // save the file
+        try {
+            FileOutputStream stream = new FileOutputStream(file);
+
+            try {
+                stream.write(puzzle.getBytes());
+            } finally {
+                stream.close();
+            }
+        } catch (IOException e) {
+            Log.e("File Manager", "Could not save game. IOException occured.");
+        }
+    }
+
     private class AsyncGenerationTask extends AsyncTask<int[][], Integer, String> {
         @Override
         protected void onPreExecute() {
@@ -235,6 +295,7 @@ public class NewLevelManager {
                     String filename = sb.toString();
 
 
+
                     // create the file
                     File file = new File(DIR, filename);
 
diff --git a/app/src/main/java/tu_darmstadt/sudoku/game/GameBoard.java b/app/src/main/java/tu_darmstadt/sudoku/game/GameBoard.java
index ba807bc..f7120d5 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/game/GameBoard.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/game/GameBoard.java
@@ -55,6 +55,9 @@ public class GameBoard implements Cloneable {
 
     public void initCells(int[] level) {
         int count = 0;
+        if(level == null) {
+            throw new IllegalArgumentException("Level array is null.");
+        }
         if(level.length != size*size) {
             throw new IllegalArgumentException("Levelarray must have length of "+size*size+".");
         }
diff --git a/app/src/main/java/tu_darmstadt/sudoku/ui/GameActivity.java b/app/src/main/java/tu_darmstadt/sudoku/ui/GameActivity.java
index ed1d820..dda5249 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/ui/GameActivity.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/ui/GameActivity.java
@@ -1,5 +1,11 @@
 package tu_darmstadt.sudoku.ui;
 
+import android.annotation.SuppressLint;
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.DialogFragment;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.graphics.Point;
@@ -17,6 +23,7 @@ import android.widget.RatingBar;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import java.util.LinkedList;
 import java.util.List;
 
 import tu_darmstadt.sudoku.controller.GameStateManager;
@@ -28,13 +35,15 @@ import tu_darmstadt.sudoku.game.GameDifficulty;
 import tu_darmstadt.sudoku.game.GameType;
 import tu_darmstadt.sudoku.game.listener.IGameSolvedListener;
 import tu_darmstadt.sudoku.game.listener.ITimerListener;
+import tu_darmstadt.sudoku.ui.listener.IHintDialogFragmentListener;
+import tu_darmstadt.sudoku.ui.listener.IResetDialogFragmentListener;
 import tu_darmstadt.sudoku.ui.view.DialogWinScreen;
 import tu_darmstadt.sudoku.ui.view.R;
 import tu_darmstadt.sudoku.ui.view.SudokuFieldLayout;
 import tu_darmstadt.sudoku.ui.view.SudokuKeyboardLayout;
 import tu_darmstadt.sudoku.ui.view.SudokuSpecialButtonLayout;
 
-public class GameActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, IGameSolvedListener ,ITimerListener {
+public class GameActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, IGameSolvedListener ,ITimerListener, IHintDialogFragmentListener, IResetDialogFragmentListener {
 
     GameController gameController;
     SudokuFieldLayout layout;
@@ -61,7 +70,7 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
                 gameType = (GameType)extras.get("gameType");
             }
             gameDifficulty = (GameDifficulty)(extras.get("gameDifficulty"));
-            loadLevel = extras.getBoolean("loadLevel");
+            loadLevel = extras.getBoolean("loadLevel", false);
             if(loadLevel) {
                 loadLevelID = extras.getInt("loadLevelID");
             }
@@ -107,7 +116,7 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
 
         //set Special keys
         specialButtonLayout = (SudokuSpecialButtonLayout) findViewById(R.id.sudokuSpecialLayout);
-        specialButtonLayout.setButtons(p.x, gameController, keyboard);
+        specialButtonLayout.setButtons(p.x, gameController, keyboard, getFragmentManager());
 
         //set TimerView
         timerView = (TextView)findViewById(R.id.timerView);
@@ -190,6 +199,11 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
         Intent intent;
 
         switch(id) {
+            case R.id.menu_reset:
+                ResetConfirmationDialog hintDialog = new ResetConfirmationDialog();
+                hintDialog.show(getFragmentManager(), "ResetDialogFragment");
+                break;
+
             case R.id.nav_newgame:
                 //create new game
                 intent = new Intent(this, MainActivity.class);
@@ -197,13 +211,6 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
                 startActivity(intent);
                 break;
 
-            case R.id.nav_continue:
-                //create new game
-                intent = new Intent(this, LoadGameActivity.class);
-                finish();
-                startActivity(intent);
-                break;
-
             case R.id.menu_settings:
                 //open settings
                 intent = new Intent(this,SettingsActivity.class);
@@ -275,4 +282,53 @@ public class GameActivity extends AppCompatActivity implements NavigationView.On
         // save time
         gameController.saveGame(this);
     }
+
+    @Override
+    public void onHintDialogPositiveClick() {
+        gameController.hint();
+    }
+
+    @Override
+    public void onResetDialogPositiveClick() {
+        gameController.resetLevel();
+    }
+
+    @Override
+    public void onDialogNegativeClick() {
+        // do nothing
+    }
+    @SuppressLint("ValidFragment")
+    public class ResetConfirmationDialog extends DialogFragment {
+
+        LinkedList<IResetDialogFragmentListener> listeners = new LinkedList<>();
+
+        @Override
+        public void onAttach(Activity activity) {
+            super.onAttach(activity);
+            // Verify that the host activity implements the callback interface
+            if(activity instanceof IHintDialogFragmentListener) {
+                listeners.add((IResetDialogFragmentListener) activity);
+            }
+        }
+
+        @Override
+        public Dialog onCreateDialog(Bundle savedInstanceState) {
+            // Use the Builder class for convenient dialog construction
+            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+            builder.setMessage(R.string.reset_confirmation)
+                    .setPositiveButton(R.string.reset_confirmation_confirm, new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int id) {
+                            for(IResetDialogFragmentListener l : listeners) {
+                                l.onResetDialogPositiveClick();
+                            }
+                        }
+                    })
+                    .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int id) {
+                            // User cancelled the dialog
+                        }
+                    });
+            return builder.create();
+        }
+    }
 }
diff --git a/app/src/main/java/tu_darmstadt/sudoku/ui/LoadGameActivity.java b/app/src/main/java/tu_darmstadt/sudoku/ui/LoadGameActivity.java
index f1f4cdb..d48dee4 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/ui/LoadGameActivity.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/ui/LoadGameActivity.java
@@ -149,7 +149,7 @@ public class LoadGameActivity extends AppCompatActivity implements IDeleteDialog
                             }
                         }
                     })
-                    .setNegativeButton(R.string.loadgame_delete_cancel, new DialogInterface.OnClickListener() {
+                    .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                         public void onClick(DialogInterface dialog, int id) {
                             // User cancelled the dialog
                         }
diff --git a/app/src/main/java/tu_darmstadt/sudoku/ui/MainActivity.java b/app/src/main/java/tu_darmstadt/sudoku/ui/MainActivity.java
index 71dc5da..3552f01 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/ui/MainActivity.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/ui/MainActivity.java
@@ -4,6 +4,7 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
 import android.support.design.widget.NavigationView;
+import android.support.v4.content.SharedPreferencesCompat;
 import android.support.v4.view.GravityCompat;
 import android.support.v4.widget.DrawerLayout;
 import android.support.v7.app.ActionBarDrawerToggle;
@@ -54,9 +55,21 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
 
         settings = PreferenceManager.getDefaultSharedPreferences(this);
 
-        // check if we need to pre generate levels.
         NewLevelManager.init(getApplicationContext(), settings);
         NewLevelManager newLevelManager = NewLevelManager.getInstance();
+
+        // Is this the very first time we start this app?
+        boolean firstStart = settings.getBoolean("firstStart", true);
+        if(firstStart) {
+            // preload some levels so we don't have to generate as many and we can start playing right away.
+            newLevelManager.loadFirstStartLevels();
+
+            SharedPreferences.Editor editor = settings.edit();
+            editor.putBoolean("firstStart", false);
+            editor.commit();
+        }
+
+        // check if we need to pre generate levels.
         newLevelManager.checkAndRestock();
 
         setContentView(R.layout.activity_main_menu);
diff --git a/app/src/main/java/tu_darmstadt/sudoku/ui/StatsActivity.java b/app/src/main/java/tu_darmstadt/sudoku/ui/StatsActivity.java
index 24e3e33..db841be 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/ui/StatsActivity.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/ui/StatsActivity.java
@@ -1,6 +1,8 @@
 package tu_darmstadt.sudoku.ui;
 
 import android.content.Context;
+import android.graphics.Color;
+import android.graphics.drawable.ColorDrawable;
 import android.support.design.widget.TabLayout;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
@@ -51,6 +53,12 @@ public class StatsActivity extends AppCompatActivity {
 
         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
+
+        android.support.v7.app.ActionBar actionBar = getSupportActionBar();
+        actionBar.setTitle(R.string.menu_highscore);
+        actionBar.setDisplayHomeAsUpEnabled(true);
+        actionBar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#024265")));
+
         // Create the adapter that will return a fragment for each of the three
         // primary sections of the activity.
         mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
@@ -79,19 +87,23 @@ public class StatsActivity extends AppCompatActivity {
         // Handle action bar item clicks here. The action bar will
         // automatically handle clicks on the Home/Up button, so long
         // as you specify a parent activity in AndroidManifest.xml.
-        int id = item.getItemId();
 
         //noinspection SimplifiableIfStatement
-        if (id == R.id.action_reset) {
-            SaveLoadStatistics.resetStats(this);
-            mSectionsPagerAdapter.refresh(this);
-            return true;
+        switch(item.getItemId()) {
+            case R.id.action_reset:
+                SaveLoadStatistics.resetStats(this);
+                mSectionsPagerAdapter.refresh(this);
+                return true;
+            case R.id.home:
+                finish();
+                return true;
         }
 
         return super.onOptionsItemSelected(item);
     }
 
 
+
     /**
      * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
      * one of the sections/tabs/pages.
diff --git a/app/src/main/java/tu_darmstadt/sudoku/ui/listener/IHintDialogFragmentListener.java b/app/src/main/java/tu_darmstadt/sudoku/ui/listener/IHintDialogFragmentListener.java
new file mode 100644
index 0000000..8d5b49c
--- /dev/null
+++ b/app/src/main/java/tu_darmstadt/sudoku/ui/listener/IHintDialogFragmentListener.java
@@ -0,0 +1,9 @@
+package tu_darmstadt.sudoku.ui.listener;
+
+/**
+ * Created by Chris on 17.01.2016.
+ */
+public interface IHintDialogFragmentListener {
+    public void onHintDialogPositiveClick();
+    public void onDialogNegativeClick();
+}
diff --git a/app/src/main/java/tu_darmstadt/sudoku/ui/listener/IResetDialogFragmentListener.java b/app/src/main/java/tu_darmstadt/sudoku/ui/listener/IResetDialogFragmentListener.java
new file mode 100644
index 0000000..97039aa
--- /dev/null
+++ b/app/src/main/java/tu_darmstadt/sudoku/ui/listener/IResetDialogFragmentListener.java
@@ -0,0 +1,9 @@
+package tu_darmstadt.sudoku.ui.listener;
+
+/**
+ * Created by Chris on 19.01.2016.
+ */
+public interface IResetDialogFragmentListener {
+    public void onResetDialogPositiveClick();
+    public void onDialogNegativeClick();
+}
diff --git a/app/src/main/java/tu_darmstadt/sudoku/ui/view/SudokuKeyboardLayout.java b/app/src/main/java/tu_darmstadt/sudoku/ui/view/SudokuKeyboardLayout.java
index 990b2d3..31eab07 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/ui/view/SudokuKeyboardLayout.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/ui/view/SudokuKeyboardLayout.java
@@ -1,15 +1,25 @@
 package tu_darmstadt.sudoku.ui.view;
 
+import android.annotation.SuppressLint;
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.DialogFragment;
 import android.content.Context;
+import android.content.DialogInterface;
 import android.graphics.Canvas;
+import android.os.Bundle;
 import android.util.AttributeSet;
 import android.util.TypedValue;
 import android.view.View;
 import android.widget.GridLayout;
 
+import java.util.LinkedList;
+
 import tu_darmstadt.sudoku.controller.GameController;
 import tu_darmstadt.sudoku.controller.Symbol;
 import tu_darmstadt.sudoku.game.listener.IHighlightChangedListener;
+import tu_darmstadt.sudoku.ui.listener.IDeleteDialogFragmentListener;
 
 /**
  * Created by TMZ_LToP on 12.11.2015.
diff --git a/app/src/main/java/tu_darmstadt/sudoku/ui/view/SudokuSpecialButtonLayout.java b/app/src/main/java/tu_darmstadt/sudoku/ui/view/SudokuSpecialButtonLayout.java
index d448775..b41427a 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/ui/view/SudokuSpecialButtonLayout.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/ui/view/SudokuSpecialButtonLayout.java
@@ -1,29 +1,42 @@
 package tu_darmstadt.sudoku.ui.view;
 
+import android.annotation.SuppressLint;
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.DialogFragment;
+import android.app.FragmentManager;
 import android.content.Context;
+import android.content.DialogInterface;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
+import android.os.Bundle;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
+import android.widget.Toast;
+
+import java.util.LinkedList;
 
 import tu_darmstadt.sudoku.controller.GameController;
+import tu_darmstadt.sudoku.ui.listener.IHintDialogFragmentListener;
 
 /**
  * Created by TMZ_LToP on 17.11.2015.
  */
 public class SudokuSpecialButtonLayout extends LinearLayout {
 
+
     SudokuSpecialButton[] fixedButtons;
     public int fixedButtonsCount = SudokuButtonType.getSpecialButtons().size();
     GameController gameController;
     SudokuKeyboardLayout keyboard;
     Bitmap bitMap,bitResult;
     Canvas canvas;
-
+    FragmentManager fragmentManager;
 
     OnClickListener listener = new OnClickListener() {
         @Override
@@ -64,9 +77,18 @@ public class SudokuSpecialButtonLayout extends LinearLayout {
                         break;
                     case Hint:
                         if(gameController.isValidCellSelected()) {
-                            gameController.hint();
+                            if(gameController.getUsedHints() == 0) {
+                                // are you sure you want to use a hint?
+                                HintConfirmationDialog hintDialog = new HintConfirmationDialog();
+                                hintDialog.show(fragmentManager, "HintDialogFragment");
+
+                            } else {
+                                gameController.hint();
+                            }
                         } else {
-                            // TODO: Display a Toast that explains how to use the Hint function.
+                            // Display a Toast that explains how to use the Hint function.
+                            Toast t = Toast.makeText(getContext(), R.string.hint_usage, Toast.LENGTH_SHORT);
+                            t.show();
                         }
                         break;
                     default:
@@ -88,7 +110,8 @@ public class SudokuSpecialButtonLayout extends LinearLayout {
         }
     }
 
-    public void setButtons(int width, GameController gc, SudokuKeyboardLayout key) {
+    public void setButtons(int width, GameController gc, SudokuKeyboardLayout key, FragmentManager fm) {
+        fragmentManager = fm;
         keyboard=key;
         gameController = gc;
         fixedButtons = new SudokuSpecialButton[fixedButtonsCount];
@@ -124,4 +147,39 @@ public class SudokuSpecialButtonLayout extends LinearLayout {
         }
 
     }
+
+    @SuppressLint("ValidFragment")
+    public class HintConfirmationDialog extends DialogFragment {
+
+        LinkedList<IHintDialogFragmentListener> listeners = new LinkedList<>();
+
+        @Override
+        public void onAttach(Activity activity) {
+            super.onAttach(activity);
+            // Verify that the host activity implements the callback interface
+            if(activity instanceof IHintDialogFragmentListener) {
+                listeners.add((IHintDialogFragmentListener) activity);
+            }
+        }
+
+        @Override
+        public Dialog onCreateDialog(Bundle savedInstanceState) {
+            // Use the Builder class for convenient dialog construction
+            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+            builder.setMessage(R.string.hint_confirmation)
+                    .setPositiveButton(R.string.hint_confirmation_confirm, new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int id) {
+                            for(IHintDialogFragmentListener l : listeners) {
+                                l.onHintDialogPositiveClick();
+                            }
+                        }
+                    })
+                    .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int id) {
+                            // User cancelled the dialog
+                        }
+                    });
+            return builder.create();
+        }
+    }
 }
diff --git a/app/src/main/res/layout/activity_game_view.xml b/app/src/main/res/layout/activity_game_view.xml
index b68c58c..0fb29f0 100644
--- a/app/src/main/res/layout/activity_game_view.xml
+++ b/app/src/main/res/layout/activity_game_view.xml
@@ -1,18 +1,95 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
+
+<android.support.design.widget.CoordinatorLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout"
-    android:layout_width="match_parent" android:layout_height="match_parent"
-    android:fitsSystemWindows="true" tools:openDrawer="start">
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fitsSystemWindows="true"
+    android:id="@+id/game_coordinate_layout"
+    tools:context="tu_darmstadt.sudoku.activity.GameActivity">
 
-    <include layout="@layout/app_bar_game_view" android:layout_width="match_parent"
-        android:layout_height="match_parent" />
+    <android.support.design.widget.AppBarLayout
+        android:layout_height="wrap_content"
+        android:layout_width="match_parent"
+        android:theme="@style/AppTheme.AppBarOverlay">
 
-    <android.support.design.widget.NavigationView android:id="@+id/nav_view"
-        android:layout_width="200dp" android:layout_height="match_parent"
-        android:layout_gravity="start|start"
-        android:background="@color/white"
-        app:menu="@menu/menu_drawer" />
-    <!--app:headerLayout="@layout/nav_header_game_view"-->
+        <android.support.v7.widget.Toolbar android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary"
+            app:popupTheme="@style/AppTheme.PopupOverlay" >
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:weightSum="14"
+                android:orientation="horizontal"
+                android:layout_marginLeft="@dimen/activity_horizontal_margin"
+                android:layout_marginRight="@dimen/activity_horizontal_margin"
+                android:gravity="center_vertical">
+                <TextView
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:text="@string/gametype_unspecified"
+                    android:id="@+id/gameModeText"
+                    android:layout_weight="8"/>
+                <RelativeLayout
+                    android:layout_width="0dp"
+                    android:layout_weight="4"
+                    android:layout_height="wrap_content">
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="@string/difficulty_easy"
+                        android:layout_centerHorizontal="true"
+                        android:id="@+id/difficultyText"
+                        />
+                    <RatingBar
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:numStars="3"
+                        android:clickable="false"
+                        android:id="@+id/gameModeStar"
+                        android:layout_centerHorizontal="true"
+                        android:layout_below="@+id/difficultyText"
+                        style="?android:attr/ratingBarStyleSmall"/>
+                </RelativeLayout>
 
-</android.support.v4.widget.DrawerLayout>
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="00:00"
+                    android:layout_weight="2"
+                    android:id="@+id/timerView"
+                    android:gravity="right"
+                    android:layout_alignParentRight="true"
+                    android:layout_centerVertical="true"/>
+            </LinearLayout>
+        </android.support.v7.widget.Toolbar>
+
+    </android.support.design.widget.AppBarLayout>
+
+    <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:id="@+id/drawer_layout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_marginTop="?attr/actionBarSize"
+        android:fitsSystemWindows="true"
+        tools:openDrawer="start">
+
+        <include layout="@layout/content_game_view" />
+
+        <android.support.design.widget.NavigationView android:id="@+id/nav_view"
+            android:layout_width="200dp"
+            android:layout_height="match_parent"
+            android:layout_gravity="start"
+            android:background="@color/white"
+            app:menu="@menu/menu_drawer" />
+        <!--app:headerLayout="@layout/nav_header_game_view"-->
+
+    </android.support.v4.widget.DrawerLayout>
+
+</android.support.design.widget.CoordinatorLayout>
diff --git a/app/src/main/res/layout/activity_main_menu.xml b/app/src/main/res/layout/activity_main_menu.xml
index 5ba5152..3254703 100644
--- a/app/src/main/res/layout/activity_main_menu.xml
+++ b/app/src/main/res/layout/activity_main_menu.xml
@@ -1,21 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v4.widget.DrawerLayout
+<android.support.design.widget.CoordinatorLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:fitsSystemWindows="true"
-    android:id="@+id/drawer_layout_main"
     tools:context="tu_darmstadt.sudoku.ui.MainActivity"
     android:layout_height="match_parent"
-    android:layout_width="match_parent"
-    >
-<android.support.design.widget.CoordinatorLayout
-
-    android:id="@+id/main_content"
-    android:layout_height="match_parent"
     android:layout_width="match_parent">
 
-
     <android.support.design.widget.AppBarLayout
         android:id="@+id/appbar"
         android:layout_width="match_parent"
@@ -34,13 +26,19 @@
 
     </android.support.design.widget.AppBarLayout>
 
+    <android.support.v4.widget.DrawerLayout
+        android:id="@+id/drawer_layout_main"
+        android:layout_height="match_parent"
+        android:layout_width="match_parent"
+        android:layout_marginTop="?attr/actionBarSize"
+        android:fitsSystemWindows="true"
+        tools:openDrawer="start">
 
    <LinearLayout
         android:layout_height="match_parent"
         android:layout_width="match_parent"
         android:orientation="vertical"
         android:weightSum="10"
-        android:layout_marginTop="?attr/actionBarSize"
         style="?android:buttonBarStyle">
         <RelativeLayout
             android:layout_width="fill_parent"
@@ -106,7 +104,7 @@
                 android:layout_height="0dp"
                 android:layout_marginLeft="30dp"
                 android:layout_marginRight="30dp"
-                android:text="@string/menu_new_game"
+                android:text="@string/new_game"
                 android:textStyle="normal"
                 android:id="@+id/playButton"
                 android:layout_gravity="center_horizontal"
@@ -136,6 +134,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:text="Win Debug"
+                android:visibility="invisible"
                 android:onClick="callFragment"/>
 <!--
             <LinearLayout
@@ -207,12 +206,14 @@
 
    </LinearLayout>
 
-</android.support.design.widget.CoordinatorLayout>
-
-    <android.support.design.widget.NavigationView android:id="@+id/nav_view_main"
-        android:layout_width="200dp" android:layout_height="match_parent"
-        android:layout_gravity="start" android:fitsSystemWindows="true"
+    <android.support.design.widget.NavigationView
+        android:id="@+id/nav_view_main"
+        android:layout_width="200dp"
+        android:layout_height="match_parent"
+        android:layout_gravity="start"
         android:background="@color/white"
-        app:menu="@menu/menu_drawer_main" />
+        app:menu="@menu/menu_drawer_main"/>
 
-</android.support.v4.widget.DrawerLayout>
\ No newline at end of file
+    </android.support.v4.widget.DrawerLayout>
+
+</android.support.design.widget.CoordinatorLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/app_bar_game_view.xml b/app/src/main/res/layout/app_bar_game_view.xml
deleted file mode 100644
index 2626479..0000000
--- a/app/src/main/res/layout/app_bar_game_view.xml
+++ /dev/null
@@ -1,75 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.CoordinatorLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:fitsSystemWindows="true"
-    android:id="@+id/game_coordinate_layout"
-    tools:context="tu_darmstadt.sudoku.activity.GameActivity">
-
-    <android.support.design.widget.AppBarLayout
-        android:layout_height="wrap_content"
-        android:layout_width="match_parent"
-        android:theme="@style/AppTheme.AppBarOverlay">
-
-        <android.support.v7.widget.Toolbar android:id="@+id/toolbar"
-            android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
-            android:background="?attr/colorPrimary"
-            app:popupTheme="@style/AppTheme.PopupOverlay" >
-            <LinearLayout
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:weightSum="14"
-                    android:orientation="horizontal"
-                    android:layout_marginLeft="@dimen/activity_horizontal_margin"
-                    android:layout_marginRight="@dimen/activity_horizontal_margin"
-                    android:gravity="center_vertical">
-                <TextView
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:text="@string/gametype_unspecified"
-                    android:id="@+id/gameModeText"
-                    android:layout_weight="8"/>
-                <RelativeLayout
-                    android:layout_width="0dp"
-                    android:layout_weight="4"
-                    android:layout_height="wrap_content">
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="@string/difficulty_easy"
-                        android:layout_centerHorizontal="true"
-                        android:id="@+id/difficultyText"
-                        />
-                    <RatingBar
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:numStars="3"
-                        android:clickable="false"
-                        android:id="@+id/gameModeStar"
-                        android:layout_centerHorizontal="true"
-                        android:layout_below="@+id/difficultyText"
-                        style="?android:attr/ratingBarStyleSmall"/>
-                </RelativeLayout>
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="00:00"
-                    android:layout_weight="2"
-                    android:id="@+id/timerView"
-                    android:gravity="right"
-                    android:layout_alignParentRight="true"
-                    android:layout_centerVertical="true"/>
-            </LinearLayout>
-        </android.support.v7.widget.Toolbar>
-
-    </android.support.design.widget.AppBarLayout>
-
-    <include layout="@layout/content_game_view" />
-
-
-</android.support.design.widget.CoordinatorLayout>
diff --git a/app/src/main/res/layout/fragment_stats.xml b/app/src/main/res/layout/fragment_stats.xml
index 6f782fd..34a4496 100644
--- a/app/src/main/res/layout/fragment_stats.xml
+++ b/app/src/main/res/layout/fragment_stats.xml
@@ -4,20 +4,9 @@
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     android:paddingBottom="@dimen/activity_vertical_margin"
-    android:weightSum="11"
+    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="1">
-            <TextView
-                android:layout_width="fill_parent"
-                android:layout_height="wrap_content"
-                android:text="@string/stats_name"
-                android:layout_gravity="center"
-                android:gravity="center"/>
-    </LinearLayout>
 
     <LinearLayout
         android:layout_width="fill_parent"
diff --git a/app/src/main/res/menu/menu_drawer.xml b/app/src/main/res/menu/menu_drawer.xml
index 71b1c86..cbe2756 100644
--- a/app/src/main/res/menu/menu_drawer.xml
+++ b/app/src/main/res/menu/menu_drawer.xml
@@ -1,23 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <group android:checkableBehavior="single">
+    <group android:id="@+id/group1">
+        <item android:id="@+id/menu_reset" android:icon="@android:drawable/ic_menu_delete"
+            android:title="@string/menu_reset" />
+    </group>
+    <group android:id="@+id/group2">
         <item android:id="@+id/nav_newgame" android:icon="@android:drawable/ic_menu_today"
-            android:title="@string/menu_new_game" />
-        <item android:id="@+id/nav_continue" android:icon="@android:drawable/ic_menu_gallery"
-            android:title="@string/menu_continue_game" />
+            android:title="@string/menu_main" />
         <item android:id="@+id/nav_highscore" android:icon="@android:drawable/ic_menu_myplaces"
             android:title="@string/menu_highscore" />
+        <item android:id="@+id/menu_settings" android:icon="@android:drawable/ic_menu_manage"
+            android:title="@string/menu_settings" />
     </group>
-    <group android:menuCategory="container" android:title="">
-        <menu>
-            <item android:id="@+id/menu_settings" android:icon="@android:drawable/ic_menu_manage"
-                android:title="@string/menu_settings" />
+    <group android:id="@+id/group3">
             <item android:id="@+id/menu_help" android:icon="@android:drawable/ic_menu_help"
                 android:title="@string/menu_help" />
             <item android:id="@+id/menu_about" android:icon="@android:drawable/ic_menu_info_details"
                 android:title="@string/menu_about" />
-        </menu>
     </group>
 
 </menu>
\ No newline at end of file
diff --git a/app/src/main/res/menu/menu_drawer_main.xml b/app/src/main/res/menu/menu_drawer_main.xml
index 5c5732b..96bf2bf 100644
--- a/app/src/main/res/menu/menu_drawer_main.xml
+++ b/app/src/main/res/menu/menu_drawer_main.xml
@@ -1,19 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
-
-    <group android:checkableBehavior="single">
+    <group android:id="@+id/group1">
         <item android:id="@+id/nav_highscore_main" android:icon="@android:drawable/ic_menu_myplaces"
             android:title="@string/menu_highscore" />
+        <item android:id="@+id/menu_settings_main" android:icon="@android:drawable/ic_menu_manage"
+        android:title="@string/menu_settings" />
     </group>
-    <group android:menuCategory="container" android:title="">
-        <menu>
-            <item android:id="@+id/menu_settings_main" android:icon="@android:drawable/ic_menu_manage"
-                android:title="@string/menu_settings" />
-            <item android:id="@+id/menu_help_main" android:icon="@android:drawable/ic_menu_help"
-                android:title="@string/menu_help" />
-            <item android:id="@+id/menu_about_main" android:icon="@android:drawable/ic_menu_info_details"
-                android:title="@string/menu_about" />
-        </menu>
+    <group android:id="@+id/group3">
+    <item android:id="@+id/menu_help_main" android:icon="@android:drawable/ic_menu_help"
+        android:title="@string/menu_help" />
+    <item android:id="@+id/menu_about_main" android:icon="@android:drawable/ic_menu_info_details"
+        android:title="@string/menu_about" />
     </group>
-
 </menu>
\ No newline at end of file
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 06cec79..50a64b9 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -6,7 +6,7 @@
     <!-- Strings related to Menu -->
     <string name="new_game">Neues Spiel</string>
     <string name="menu_settings">Einstellungen</string>
-    <string name="menu_highscore">Bestenliste</string>
+    <string name="menu_highscore">Statistik</string>
     <string name="menu_main">Hauptmenü</string>
     <string name="menu_group">Gruppe</string>
     <string name="menu_help">Hilfe</string>
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
index edfd125..52dafc0 100644
--- a/app/src/main/res/values/dimens.xml
+++ b/app/src/main/res/values/dimens.xml
@@ -7,6 +7,6 @@
     <dimen name="nav_header_vertical_spacing">13dp</dimen>
     <dimen name="nav_header_height">160dp</dimen>
     <dimen name="appbar_padding_top">8dp</dimen>
-    <dimen name="app_bar_height">180dp</dimen>
+    <dimen name="app_bar_height">24dp</dimen>
     <dimen name="text_margin">16dp</dimen>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 4e01c61..a7a5533 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -2,14 +2,18 @@
     <string name="app_name">Sudoku</string>
     <string name="title_activity_game_view">Sudoku</string>
 
+    <string name="cancel">Cancel</string>
+
     <!-- ###MAIN MENU### -->
-    <string name="menu_new_game">New Game</string>
+    <string name="new_game">New Game</string>
+    <string name="menu_main">Main Menu</string>
     <string name="menu_settings">Settings</string>
     <string name="menu_highscore">Highscore</string>
     <string name="menu_group">Group</string>
     <string name="menu_help">Help</string>
     <string name="menu_about">About</string>
-    <string name="menu_continue_game">continue game</string>
+    <string name="menu_reset">Reset Board</string>
+    <string name="menu_continue_game">Continue Game</string>
 
     <string name="description">a privacy friendly logic puzzle</string>
 
@@ -71,30 +75,33 @@
     <string name="difficulty_hard">Hard</string>
 
     <!--###GameActivity -->
-    <string name="Sudoku"></string>
+    <string name="Sudoku">Sudoku</string>
     <string name="gametype_default_9x9">Standart Sudoku 9x9</string>
     <string name="gametype_default_6x6">Standart Sudoku 6x6</string>
     <string name="gametype_unspecified">Unspec</string>
     <string name="gametype_default_12x12">Standart Sudoku 12x12</string>
     <string name="gametype_x_9x9">X Sudoku 9x9</string>
     <string name="gametype_hyper_9x9">Hyper Sudoku 9x9</string>
-    <string name="title_activity_stats_game">StatsGameActivity</string>
-    <string name="section_format">Hello World from section: %1$d</string>
+    <string name="title_activity_stats_game">Statistics</string>
+    <string name="hint_usage">Select a valid field and then press the hint button to reveal the solution.</string>
+    <string name="hint_confirmation">Are you sure you want to use this hint? When using hints, you will not be able to achieve a personal best time.</string>
+    <string name="hint_confirmation_confirm">Use</string>
+    <string name="reset_confirmation">Are you sure you want to reset the game board?</string>
+    <string name="reset_confirmation_confirm">Reset</string>
 
     <!-- ### Continue Game ### -->
     <string name="loadgame_delete_confirmation">Are you sure you want to delete this save?</string>
     <string name="loadgame_delete_confirm">Delete</string>
-    <string name="loadgame_delete_cancel">Cancel</string>
     <string name="title_activity_stats">StatsActivity</string>
 
     <!-- ### Stats ###-->
     <string name="stats_name">Statistics</string>
-    <string name="number_of_hints">Number of Hints Used:</string>
-    <string name="number_of_games">#Games:</string>
-    <string name="total_of_time">Total time Played:</string>
-    <string name="average_time">Av time:</string>
-    <string name="min_time">Min time:</string>
-    <string name="reset_stats">reset stats</string>
+    <string name="number_of_hints">Number of hints used:</string>
+    <string name="number_of_games">Number of games played:</string>
+    <string name="total_of_time">Total time played:</string>
+    <string name="average_time">Average time:</string>
+    <string name="min_time">Minimum time:</string>
+    <string name="reset_stats">Reset All</string>
 
 
     <!--### Win Strings -->
diff --git a/app/src/main/res/xml/pref_general.xml b/app/src/main/res/xml/pref_general.xml
index 626632c..3f17484 100644
--- a/app/src/main/res/xml/pref_general.xml
+++ b/app/src/main/res/xml/pref_general.xml
@@ -11,7 +11,7 @@
     <ListPreference
         android:key="pref_symbols"
         android:title="@string/pref_symbols"
-        android:defaultValue="-1"
+        android:defaultValue="Default"
         android:entries="@array/pref_symbols_list_titles"
         android:entryValues="@array/pref_symbols_list_values"
         android:negativeButtonText="@null"