I have a live wallpaper that is running fine. I wanted to add a settings activity to it, so I did all of the required steps and the settings button showed up when I went to the live wallpaper chooser. However, when I click on the settings button, I get the following exception.
11-23 16:12:53.158: E/AndroidRuntime(5141): FATAL EXCEPTION: main
11-23 16:12:53.158: E/AndroidRuntime(5141): java.lang.IllegalArgumentException
11-23 16:12:53.158: E/AndroidRuntime(5141): at android.view.Surface.nativeUnlockCanvasAndPost(Native Method)
11-23 16:12:53.158: E/AndroidRuntime(5141): at android.view.Surface.unlockCanvasAndPost(Surface.java:457)
11-23 16:12:53.158: E/AndroidRuntime(5141): at com.android.internal.view.BaseSurfaceHolder.unlockCanvasAndPost(BaseSurfaceHolder.java:215)
11-23 16:12:53.158: E/AndroidRuntime(5141): at com.gulshansingh.hackerlivewallpaper.HackerWallpaperService$HackerWallpaperEngine.draw(HackerWallpaperService.java:48)
11-23 16:12:53.158: E/AndroidRuntime(5141): at com.gulshansingh.hackerlivewallpaper.HackerWallpaperService$HackerWallpaperEngine.access$0(HackerWallpaperService.java:36)
11-23 16:12:53.158: E/AndroidRuntime(5141): at com.gulshansingh.hackerlivewallpaper.HackerWallpaperService$HackerWallpaperEngine$1.run(HackerWallpaperService.java:31)
11-23 16:12:53.158: E/AndroidRuntime(5141): at android.os.Handler.handleCallback(Handler.java:725)
11-23 16:12:53.158: E/AndroidRuntime(5141): at android.os.Handler.dispatchMessage(Handler.java:92)
11-23 16:12:53.158: E/AndroidRuntime(5141): at android.os.Looper.loop(Looper.java:137)
11-23 16:12:53.158: E/AndroidRuntime(5141): at android.app.ActivityThread.main(ActivityThread.java:5039)
11-23 16:12:53.158: E/AndroidRuntime(5141): at java.lang.reflect.Method.invokeNative(Native Method)
11-23 16:12:53.158: E/AndroidRuntime(5141): at java.lang.reflect.Method.invoke(Method.java:511)
11-23 16:12:53.158: E/AndroidRuntime(5141): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
11-23 16:12:53.158: E/AndroidRuntime(5141): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
11-23 16:12:53.158: E/AndroidRuntime(5141): at dalvik.system.NativeStart.main(Native Method)
This is the code that's causing the exception which has been working fine until now (the line causing the exception has been indicated):
/** Draws all of the bit sequences on the screen */
private void draw() {
SurfaceHolder holder = getSurfaceHolder();
Canvas c = holder.lockCanvas();
if (c != null) {
try {
c.drawARGB(255, 0, 0, 0);
for (int i = 0; i < sequences.size(); i++) {
sequences.get(i).draw(c);
}
} finally {
holder.unlockCanvasAndPost(c); // line 48
}
}
// Remove the runnable, and only schedule the next run if visible
handler.removeCallbacks(drawRunnable);
if (visible) {
handler.post(drawRunnable);
} else {
stop();
}
}
The sequences.get(i).draw() method is as follows
synchronized public void draw(Canvas canvas) {
paint.setAlpha(0);
float prevY = y;
for (int i = 0; i < bits.size(); i++) {
canvas.drawText(bits.get(i), x, y, paint);
y += TEXT_SIZE;
paint.setAlpha(paint.getAlpha() + INCREMENT);
}
y = prevY;
}
In my opinion this is the only relevant code, but if you want to see more I can post it here (please ask before downvoting). Also, the entire code is available on Github here.
