LiveWallpaperService.java :  » Samples » androgames-sample » net » androgames » blog » sample » livewallpaper » Android Open Source

package net.androgames.blog.sample.livewallpaper;

import android.content.SharedPreferences;
import android.service.wallpaper.WallpaperService;
import android.view.MotionEvent;
import android.view.SurfaceHolder;

/**
 * 
 * A sample class that defines a LiveWallpaper an it's associated Engine.
 * The Engine delegates all the Wallpaper painting stuff to a specialized Thread.
 * 
 * Sample from <a href="http://blog.androgames.net">Androgames tutorials blog</a>
 * Under GPL v3 : http://www.gnu.org/licenses/gpl-3.0.html
 * 
 * @author antoine vianey
 *
 */
public class LiveWallpaperService extends WallpaperService {

  public static final String PREFERENCES = "net.androgames.blog.sample.livewallpaper";
  public static final String PREFERENCE_RADIUS = "preference_radius";

  @Override
  public Engine onCreateEngine() {
    return new SampleEngine();
  }

  @Override
  public void onCreate() {
    super.onCreate();
  }

  @Override
  public void onDestroy() {
    super.onDestroy();
  }

  public class SampleEngine extends Engine implements SharedPreferences.OnSharedPreferenceChangeListener {

    private LiveWallpaperPainting painting;
    private SharedPreferences prefs;
    
    SampleEngine() {
      SurfaceHolder holder = getSurfaceHolder();
      prefs = LiveWallpaperService.this.getSharedPreferences(PREFERENCES, 0);
      prefs.registerOnSharedPreferenceChangeListener(this);
      painting = new LiveWallpaperPainting(holder, getApplicationContext(), 
          Integer.parseInt(prefs.getString(PREFERENCE_RADIUS, "10")));
    }

    public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
      painting.setRadius(Integer.parseInt(prefs.getString(PREFERENCE_RADIUS, "10")));
    }

    @Override
    public void onCreate(SurfaceHolder surfaceHolder) {
      super.onCreate(surfaceHolder);
      setTouchEventsEnabled(true);
    }

    @Override
    public void onDestroy() {
      super.onDestroy();
      // remove listeners and callbacks here
      painting.stopPainting();
    }

    @Override
    public void onVisibilityChanged(boolean visible) {
      if (visible) {
        painting.resumePainting();
      } else {
        // remove listeners and callbacks here
        painting.pausePainting();
      }
    }

    @Override
    public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
      super.onSurfaceChanged(holder, format, width, height);
      painting.setSurfaceSize(width, height);
    }

    @Override
    public void onSurfaceCreated(SurfaceHolder holder) {
      super.onSurfaceCreated(holder);
      painting.start();
    }

    @Override
    public void onSurfaceDestroyed(SurfaceHolder holder) {
      super.onSurfaceDestroyed(holder);
      boolean retry = true;
      painting.stopPainting();
      while (retry) {
        try {
          painting.join();
          retry = false;
        } catch (InterruptedException e) {}
      }
    }

    @Override
    public void onOffsetsChanged(float xOffset, float yOffset, 
        float xStep, float yStep, int xPixels, int yPixels) {
    }

    @Override
    public void onTouchEvent(MotionEvent event) {
      super.onTouchEvent(event);
      painting.doTouchEvent(event);
    }
    
  }
  
}