Android Open Source - SnakeWallpaper Wallpaper

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From Project

Back to project page SnakeWallpaper.

License

The source code is released under:

Apache License

Java Source Code

package com.jakewharton.snakewallpaper;
//  ww w  . j  av  a  2s.c  o  m
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.os.Handler;
import android.service.wallpaper.WallpaperService;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;

/**
 * An apple a day...
 * 
 * @author Jake Wharton
 */
public class Wallpaper extends WallpaperService {
  /**
   * SharedPreferences instance.
   */
  /*package*/static SharedPreferences PREFERENCES;
  
  /**
   * Wallpaper Context instance.
   */
  /*package*/static Context CONTEXT;
    
  /**
   * Whether or not we are logging in debug mode.
   */
  /*package*/static final boolean LOG_DEBUG = false;
  
  /**
   * Whether or not we are logging in verbose mode.
   */
  /*package*/static final boolean LOG_VERBOSE = false;
  
  /**
   * Whether or not the wallpaper should automatically advance to the next frame.
   */
    /*package*/ static final boolean AUTO_FPS = true;

    /**
     * Whether or not to allow playback (and debugging!) in the Picker activity.
     */
  /*package*/static final boolean PLAY_DEBUG = false;
    
    /**
     * Height (in DIP) of the status bar. Usually.
     */
    private static final int STATUS_BAR_HEIGHT = 24;
    
    /**
     * Height (in DIP) of the app drawer on the launcher.
     */
    private static final int APP_DRAWER_HEIGHT = 50;
  
  /**
   * Number of millisecond in a second.
   */
  /*package*/static final int MILLISECONDS_IN_SECOND = 1000;
  
  /**
   * Maximum time between taps that will reset the game.
   */
  /*package*/static final long RESET_THRESHOLD = 100;
    
    
    
    /**
     * The timed callback handler.
     */
    private final Handler mHandler = new Handler();

    
    
    @Override
    public Engine onCreateEngine() {
      Wallpaper.PREFERENCES = this.getSharedPreferences(Preferences.SHARED_NAME, Context.MODE_PRIVATE);
      Wallpaper.CONTEXT = this;
      
      this.performFirstRunCheckAndSetup();
      
        return new SnakeEngine();
    }
    
    /**
     * Sets up some preferences based on screen size on the first run only.
     */
    private void performFirstRunCheckAndSetup() {
      final Resources resources = this.getResources();
        final int defaultVersion = resources.getInteger(R.integer.version_code_default);
        final int previousVersion = Wallpaper.PREFERENCES.getInt(resources.getString(R.string.version_code_key), defaultVersion);
        
        if (previousVersion == defaultVersion) {
          //First install
          final float density = this.getResources().getDisplayMetrics().density;
          final SharedPreferences.Editor editor = Wallpaper.PREFERENCES.edit();
          
          //Base top and bottom padding off of known metrics
          final int topHeight = (int)(density * Wallpaper.STATUS_BAR_HEIGHT);
          final int bottomHeight = (int)(density * Wallpaper.APP_DRAWER_HEIGHT);
          editor.putInt(resources.getString(R.string.settings_display_padding_top_key), topHeight);
          editor.putInt(resources.getString(R.string.settings_display_padding_bottom_key), bottomHeight);
          
          editor.commit();
        } else {
          //Check for any upgrade steps in upgrade order
          
          //XXX: Put upgrade scripts here...
        }
    }

    
    
    /**
     * Wallpaper engine to manage the Game instance.
     * 
     * @author Jake Wharton
     */
    private class SnakeEngine extends Engine implements SharedPreferences.OnSharedPreferenceChangeListener {
      /**
       * Tag used for logging.
       */
      private static final String TAG = "SnakeWallpaper.SnakeEngine";
      
      
      
      /**
       * Instance of the game.
       */
      private Game mGame;
      
      /**
       * Whether or not the wallpaper is currently visible on screen.
       */
        private boolean mIsVisible;
        
        /**
         * The number of FPS the user wants us to render.
         */
        private int mFPS;
        
        /**
         * Whether or not user input is taken into consideration.
         */
        private boolean mIsControllable;
        
        /**
         * The absolute center of the screen horizontally.
         */
        private float mScreenCenterX;
        
        /**
         * The absolute center of the screen vertically.
         */
        private float mScreenCenterY;
        
        /**
         * The system milliseconds of the last user touch.
         */
        private long mLastTouch;

        /**
         * A runnable which automates the frame rendering.
         */
        private final Runnable mDrawWakka = new Runnable() {
            public void run() {
              SnakeEngine.this.newFrame();
                SnakeEngine.this.draw();
            }
        };

        
        
        /**
         * Create instance of the engine.
         */
        public SnakeEngine() {
          if (Wallpaper.LOG_VERBOSE) {
            Log.v(SnakeEngine.TAG, "> SnakeEngine()");
          }
          
            this.mGame = new Game();
            this.mLastTouch = 0;

            //Load all preferences or their defaults
            Wallpaper.PREFERENCES.registerOnSharedPreferenceChangeListener(this);
            this.onSharedPreferenceChanged(Wallpaper.PREFERENCES, null);
            
          if (Wallpaper.LOG_VERBOSE) {
            Log.v(SnakeEngine.TAG, "< SnakeEngine()");
          }
        }

        
        
        /**
         * Handle the changing of a preference.
         */
    public void onSharedPreferenceChanged(final SharedPreferences preferences, final String key) {
          if (Wallpaper.LOG_VERBOSE) {
            Log.v(SnakeEngine.TAG, "> onSharedPreferenceChanged()");
          }
          
      final boolean all = (key == null);
      final Resources resources = Wallpaper.CONTEXT.getResources();
      
      final String fps = Wallpaper.this.getString(R.string.settings_display_fps_key);
      if (all || key.equals(fps)) {
        this.mFPS = preferences.getInt(fps, resources.getInteger(R.integer.display_fps_default));
        
        if (Wallpaper.LOG_DEBUG) {
          Log.d(SnakeEngine.TAG, "FPS: " + this.mFPS);
        }
      }
      
      final String userControl = Wallpaper.this.getString(R.string.settings_game_usercontrol_key);
      if (all || key.equals(userControl)) {
        this.mIsControllable = preferences.getBoolean(userControl, resources.getBoolean(R.bool.game_usercontrol_default));
        
        if (Wallpaper.LOG_DEBUG) {
          Log.d(SnakeEngine.TAG, "Is User Controllable: " + this.mIsControllable);
        }
      }

          if (Wallpaper.LOG_VERBOSE) {
            Log.v(SnakeEngine.TAG, "< onSharedPreferenceChanged()");
          }
    }

        @Override
        public void onVisibilityChanged(final boolean visible) {
            this.mIsVisible = visible;
            if (visible) {
                this.draw();
                
                if (Wallpaper.AUTO_FPS) {
                  this.newFrame();
                }
            } else {
                Wallpaper.this.mHandler.removeCallbacks(this.mDrawWakka);
            }
        }
        
        @Override
        public void onCreate(final SurfaceHolder surfaceHolder) {
          super.onCreate(surfaceHolder);

          if (this.mIsControllable) {
            //By default we don't get touch events, so enable them.
            this.setTouchEventsEnabled(true);
          }
        }

        @Override
        public void onDestroy() {
            super.onDestroy();
            Wallpaper.this.mHandler.removeCallbacks(mDrawWakka);
        }
        
        @Override
        public void onTouchEvent(final MotionEvent event) {
          if (event.getAction() == MotionEvent.ACTION_DOWN) {
            final long touch = System.currentTimeMillis();
            if (touch - this.mLastTouch < Wallpaper.RESET_THRESHOLD) {
              this.mGame.newGame();
              this.mLastTouch = 0;
            } else if (this.mIsControllable) {
              this.mLastTouch = touch;
              
              final float deltaX = this.mScreenCenterX - event.getX();
              final float deltaY = this.mScreenCenterY - event.getY();
              
              if (Math.abs(deltaX) > Math.abs(deltaY)) {
                if (deltaX > 0) {
                  this.mGame.setWantsToGo(Game.Direction.WEST);
                } else {
                  this.mGame.setWantsToGo(Game.Direction.EAST);
                }
              } else {
                if (deltaY > 0) {
                  this.mGame.setWantsToGo(Game.Direction.NORTH);
                } else {
                  this.mGame.setWantsToGo(Game.Direction.SOUTH);
                }
              }
            }
            
            if (!Wallpaper.AUTO_FPS) {
              this.mGame.tick();
              this.draw();
            }
          }
        }

        @Override
        public void onSurfaceChanged(final SurfaceHolder holder, final int format, final int width, final int height) {
          if (Wallpaper.LOG_VERBOSE) {
            Log.v(SnakeEngine.TAG, "> onSurfaceChanged(width = " + width + ", height = " + height + ")");
          }
          
            super.onSurfaceChanged(holder, format, width, height);
            
            this.mScreenCenterX = width / 2.0f;
            this.mScreenCenterY = height / 2.0f;
            
            if (Wallpaper.LOG_DEBUG) {
              Log.d(SnakeEngine.TAG, "Center X: " + this.mScreenCenterX);
              Log.d(SnakeEngine.TAG, "Center Y: " + this.mScreenCenterY);
            }
            
            //Trickle down
            this.mGame.performResize(width, height);
            
            //Redraw with new settings
            this.draw();
            
            if (Wallpaper.LOG_VERBOSE) {
              Log.v(SnakeEngine.TAG, "< onSurfaceChanged()");
            }
        }

        @Override
        public void onSurfaceDestroyed(final SurfaceHolder holder) {
            super.onSurfaceDestroyed(holder);
            this.mIsVisible = false;
            Wallpaper.this.mHandler.removeCallbacks(this.mDrawWakka);
        }
        
        /**
         * Advance the game by one frame.
         */
        private void newFrame() {
          this.mGame.tick();

          if (Wallpaper.AUTO_FPS) {
            if (this.mIsVisible) {
                Wallpaper.this.mHandler.postDelayed(this.mDrawWakka, Wallpaper.MILLISECONDS_IN_SECOND / this.mFPS);
              }
            }
        }

        /**
         * Draws the current state of the game to the wallpaper.
         */
        private void draw() {
            final SurfaceHolder holder = this.getSurfaceHolder();

            Canvas c = null;
            try {
                c = holder.lockCanvas();
                if (c != null) {
                    this.mGame.draw(c);
                }
            } finally {
                if (c != null) {
                  holder.unlockCanvasAndPost(c);
                }
            }
        }
    }
}

Java Source Code List

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