如何为Android动态壁纸设置背景图片..？

嗨，我想为资源文件夹中的动态壁纸设置一个背景图像，在该图像上我想做一些其他动画的东西。该背景不应改变。此代码我尝试过，但没有工作...如何为Android动态壁纸设置背景图片..？

@Override 
     public void onCreate(SurfaceHolder holder) { 
      super.onCreate(holder); 
      Log.i("onCreate","onCreate"); 
      Canvas c = null; 
      c = holder.lockCanvas(); 
      try { 
       if(c != null) 
       doDraw(c); 
      } catch(Exception e) { 
       Log.e(TAG, "Exception Accourd "); 
      } 
} 

public void doDraw(Canvas c) { 
      Resources res = getResources(); 
      Bitmap bm = BitmapFactory.decodeResource(res, R.drawable.bg_port); 
      c.drawBitmap(bm, 0, 0, null); 
     }

图像不加载，它捕捉错误。

堆栈跟踪如下

04-05 00:10:07.211: W/System.err(979): java.lang.NullPointerException 
04-05 00:10:07.221: W/System.err(979): at com.exp.wallpaper.MyWallPaperService$MyWallPaperEngine.doDraw(MyWallPaperService.java:94) 
04-05 00:10:07.221: W/System.err(979): at com.exp.wallpaper.MyWallPaperService$MyWallPaperEngine.onCreate(MyWallPaperService.java:125) 
04-05 00:10:07.231: W/System.err(979): at android.service.wallpaper.WallpaperService$Engine.attach(WallpaperService.java:648) 
04-05 00:10:07.231: W/System.err(979): at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:875) 
04-05 00:10:07.241: W/System.err(979): at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61) 
04-05 00:10:07.241: W/System.err(979): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-05 00:10:07.241: W/System.err(979): at android.os.Looper.loop(Looper.java:123) 
04-05 00:10:07.241: W/System.err(979): at android.app.ActivityThread.main(ActivityThread.java:3683) 
04-05 00:10:07.251: W/System.err(979): at java.lang.reflect.Method.invokeNative(Native Method) 
04-05 00:10:07.251: W/System.err(979): at java.lang.reflect.Method.invoke(Method.java:507) 
04-05 00:10:07.251: W/System.err(979): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
04-05 00:10:07.251: W/System.err(979): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
04-05 00:10:07.251: W/System.err(979): at dalvik.system.NativeStart.main(Native Method)

来源

2013-04-04 KKC

发布堆栈跟踪。 – JoxTraex 2013-04-04 05:48:31

给出试试这个代码.......................

public void drawFrame() { final SurfaceHolder holder = getSurfaceHolder(); 
     try { 
      c = holder.lockCanvas(); 
      c.save(); 
      if (c != null) { 
        doDraw(c); 
      } 
     } finally { 
      if (c != null) holder.unlockCanvasAndPost(c); 
     } 
     mHandler.removeCallbacks(onadraw); 
     if (mVisible) { 
      mHandler.postDelayed(onadraw, 1000/25); 
     }} 
public void doDraw(Canvas c) {Resources res = getResources(); 
     Bitmap bm = BitmapFactory.decodeResource(res, R.drawable.bg_port); 
     c.drawBitmap(bm, 0, 0, null); 
    }

来源

2013-04-25 19:51:00 vik

如何为Android动态壁纸设置背景图片..？

回答

相关问题