Live wallpaper animation force closing when I add more than 10 frames?

Question

I'm trying to make a simple livewallpaper out of a series of boot animation .pngs...

I'm using

private static final int NUM_RES = 9;
        private final Bitmap[] mPics = new Bitmap[NUM_RES];
        CubeEngine() {
            Resources res = getResources();
            for (int i = 0; i< NUM_RES; i++) {
                int id = res.getIdentifier("boot_0010" + (i + 1), "drawable", "minghai.wallpaper");
                mPics[i] = BitmapFactory.decodeResource(res, id);
            }
        }

9 seems to be the highest I can go. If i set NUM_RES to anything over 9 i get a force close.

All my files are labeled... boot_00101.png boot_00102.png boot_00103.png boot_00104.png boot_00105.png boot_00106.png boot_00107.png boot_00108.png boot_00109.png boot_00110.png boot_00111.png boot_00112.png boot_00113.png boot_00114.png and so on...I have about 50 images im trying to use

Anyone know what I should be doing?

LOGCAT:

08-21 19:18:43.108: ERROR/AndroidRuntime(6475): FATAL EXCEPTION: main
08-21 19:18:43.108: ERROR/AndroidRuntime(6475): java.lang.NullPointerException
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at android.graphics.Canvas.drawBitmap(Canvas.java:1115)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at minghai.wallpaper.YayoiWallpaper$CubeEngine.drawYayoi(YayoiWallpaper.java:166)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at minghai.wallpaper.YayoiWallpaper$CubeEngine.drawFrame(YayoiWallpaper.java:144)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at minghai.wallpaper.YayoiWallpaper$CubeEngine.onOffsetsChanged(YayoiWallpaper.java:117)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at android.service.wallpaper.WallpaperService$Engine.doOffsetsChanged(WallpaperService.java:669)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:847)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at android.os.Looper.loop(Looper.java:123)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at android.app.ActivityThread.main(ActivityThread.java:4627)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at java.lang.reflect.Method.invokeNative(Native Method)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at java.lang.reflect.Method.invoke(Method.java:521)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-21 19:18:43.108: ERROR/AndroidRuntime(6475):     at dalvik.system.NativeStart.main(Native Method)

@Yok Thank you so much that did the trick....to an extent, i can't seem to go past 30 I get a memory error. Sorry to ask, but would you happen to know of a more efficient way to simply get an animation like i'm trying to achieve.

08-22 04:35:03.720: ERROR/AndroidRuntime(8783): FATAL EXCEPTION: main
08-22 04:35:03.720: ERROR/AndroidRuntime(8783): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.graphics.Bitmap.nativeCreate(Native Method)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.graphics.Bitmap.createBitmap(Bitmap.java:468)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.graphics.Bitmap.createBitmap(Bitmap.java:435)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:340)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.graphics.BitmapFactory.finishDecode(BitmapFactory.java:488)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:462)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:323)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.graphics.BitmapFactory.decodeResource(BitmapFactory.java:346)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.graphics.BitmapFactory.decodeResource(BitmapFactory.java:372)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at minghai.wallpaper.YayoiWallpaper$CubeEngine.<init>(YayoiWallpaper.java:60)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at minghai.wallpaper.YayoiWallpaper.onCreateEngine(YayoiWallpaper.java:35)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:814)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.os.Looper.loop(Looper.java:123)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at android.app.ActivityThread.main(ActivityThread.java:4627)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at java.lang.reflect.Method.invokeNative(Native Method)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at java.lang.reflect.Method.invoke(Method.java:521)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-22 04:35:03.720: ERROR/AndroidRuntime(8783):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

When i is 9, the expression "boot_0010" + (i + 1) evaluates to the string boot_001010; you probably wanted it to be boot_00110.

Answer 2

There is problem with your for loop change :

"boot_0010" + (i + 1) to "boot_00" + (100+ (i + 1))

Changed loop should look like :

       for (int i = 0; i< NUM_RES; i++) {
            int id = res.getIdentifier("boot_00" + (100 + (i + 1)), "drawable", "minghai.wallpaper");
            mPics[i] = BitmapFactory.decodeResource(res, id);
        }

Problem with your loop was that earlier it used to get boot_001010 instead of boot_00110 for 10th image. And same was reason for null pointer exception as image with boot_001010 is not present.