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POLive Wallpaper + bitmap + canvas
 

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  1. POLive Wallpaper + bitmap + canvas
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    <p>Helo everyone! I have this live wallpaper in witch I try to show a bitmap trough a canvas (the drawable resource is a 400k 1900x1200 jpg). It force-closes and I don't get why (it's my first Android project). These are the "important" bits:</p> <pre><code> wallEngine() { // CONSTRUCTOR &lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt; mStartTime = SystemClock.elapsedRealtime(); Log.v(Logcat, "Contructor ok"); } //====================================== INIT private final Runnable mDrawWall = new Runnable() { //=========== RUN public void run() { drawFrame(); } }; void drawFrame() { final SurfaceHolder holder = getSurfaceHolder(); Canvas c = null; try { c = holder.lockCanvas(); if (c != null) { // draw something updatePhysics(); doDraw(c); } } finally { if (c != null) holder.unlockCanvasAndPost(c); } // Reschedule the next redraw mHandler.removeCallbacks(mDrawWall); if (mVisible) { mHandler.postDelayed(mDrawWall, 5000); } } private void doDraw(Canvas canvas) { //backgroundImage.prepareToDraw(); canvas.drawBitmap(this.backgroundImage, 0, 0, null); } public void onCreate(SurfaceHolder surfaceHolder) { super.onCreate(surfaceHolder); surfaceHolder.setFormat(android.graphics.PixelFormat.RGBA_8888); BitmapFactory.Options options = new BitmapFactory.Options(); options.inPurgeable = true; this.backgroundImage = BitmapFactory.decodeResource(getResources(), com.misca.livewallpapers.parang.R.drawable.a, options); //backgroundImage.prepareToDraw(); //setTouchEventsEnabled(true); Log.v(Logcat, "onCreate ok"); } </code></pre> <p>And the logcat errors when i try to run it on my phone are :</p> <pre><code>ERROR/AndroidRuntime(7722): FATAL EXCEPTION: main ERROR/AndroidRuntime(7722): java.lang.NullPointerException ERROR/AndroidRuntime(7722): at android.graphics.Canvas.throwIfRecycled(Canvas.java:957) ERROR/AndroidRuntime(7722): at android.graphics.Canvas.drawBitmap(Canvas.java:983) ERROR/AndroidRuntime(7722): at com.misca.livewallpapers.parang.liveWallpaper$wallEngine.doDraw(liveWallpaper.java:115) ERROR/AndroidRuntime(7722): at com.misca.livewallpapers.parang.liveWallpaper$wallEngine.drawFrame(liveWallpaper.java:75) ERROR/AndroidRuntime(7722): at com.misca.livewallpapers.parang.liveWallpaper$wallEngine.onSurfaceChanged(liveWallpaper.java:157) ERROR/AndroidRuntime(7722): at android.service.wallpaper.WallpaperService$Engine.updateSurface(WallpaperService.java:590) ERROR/AndroidRuntime(7722): at android.service.wallpaper.WallpaperService$Engine.attach(WallpaperService.java:654) ERROR/AndroidRuntime(7722): at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:878) ERROR/AndroidRuntime(7722): at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61) ERROR/AndroidRuntime(7722): at android.os.Handler.dispatchMessage(Handler.java:99) ERROR/AndroidRuntime(7722): at android.os.Looper.loop(Looper.java:123) ERROR/AndroidRuntime(7722): at android.app.ActivityThread.main(ActivityThread.java:3848) ERROR/AndroidRuntime(7722): at java.lang.reflect.Method.invokeNative(Native Method) ERROR/AndroidRuntime(7722): at java.lang.reflect.Method.invoke(Method.java:507) ERROR/AndroidRuntime(7722): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) ERROR/AndroidRuntime(7722): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 03-23 00:26:42.309: ERROR/AndroidRuntime(7722): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Thank you! :)</p> <p>======================= News:</p> <pre><code> private void doDraw(Canvas canvas) { //backgroundImage.prepareToDraw(); if(this.backgroundImage!=null) canvas.drawBitmap(this.backgroundImage, 0, 0, null); else Log.v(Logcat, "null"); } </code></pre> <p>And seems the bitmap is null. Now i'm working with a 480x800 to ensure there are no memory problems. The app doesn't crash anymore with the if statement (empty black screen)</p>
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    1. USKara
    1. USMisca
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    1. COHave you ensured that the backgroundImage member is not null after it's instantiated during onCreate? If so, it seems like the image is being recycled and so the image reference is invalidated, hence the NullPointerException.
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      1. POLive Wallpaper + bitmap + canvas
      1. USChris Hutchinson
    2. COyou're right! it's null, thank you. Any beter way to load it into the bitmap?
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