我正在尝试为Android创建我自己的动态壁纸。我已经开始编译并打开设置Activity的项目。但是,对于点击选择壁纸选择崩溃按钮后出现以下异常:Android LiveWallpaper选取器崩溃
FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
at java.util.concurrent.FutureTask.run(FutureTask.java:239)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:838)
Caused by: java.lang.ClassCastException: android.graphics.drawable.LayerDrawable cannot be cast to android.graphics.drawable.BitmapDrawable
at com.android.wallpaper.livepicker.LiveWallpaperListAdapter$LiveWallpaperEnumerator.doInBackground(LiveWallpaperListAdapter.java:226)
at com.android.wallpaper.livepicker.LiveWallpaperListAdapter$LiveWallpaperEnumerator.doInBackground(LiveWallpaperListAdapter.java:149)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:838)
它也出现在从手机设置开放的壁纸选择。 我的壁纸可以成为错误的原因吗?如何?我目前不使用任何drawable。
新增
代码开放的壁纸选择:
Intent intent = new Intent(WallpaperManager.ACTION_LIVE_WALLPAPER_CHOOSER);
intent.putExtra(WallpaperManager.WALLPAPER_PREVIEW_META_DATA,
new ComponentName(SettingsActivity.this, MyWallpaperService.class));
startActivity(intent);
而且MyWallpaperService
类代码:
public class MyWallpaperService extends WallpaperService {
@Override
public Engine onCreateEngine() {
return new MyEngine();
}
private class MyEngine extends Engine {
private boolean visible;
private Handler handler;
private Runnable drawRunner = new Runnable() {
@Override
public void run() {
draw();
}
};
private int width;
private int height;
private BallsContainer balls;
public MyEngine() {
balls = new BallsContainer();
}
@Override
public void onVisibilityChanged(boolean visible) {
this.visible = visible;
if (visible) {
handler.post(drawRunner);
} else {
handler.removeCallbacks(drawRunner);
}
}
@Override
public void onSurfaceDestroyed(SurfaceHolder holder) {
super.onSurfaceDestroyed(holder);
this.visible = false;
handler.removeCallbacks(drawRunner);
}
@Override
public void onSurfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
this.width = width;
this.height = height;
super.onSurfaceChanged(holder, format, width, height);
}
private void draw() {
SurfaceHolder holder = getSurfaceHolder();
Canvas canvas = null;
try {
canvas = holder.lockCanvas();
if (canvas != null) {
balls.Draw(canvas, width, height);
}
} finally {
if (canvas != null)
holder.unlockCanvasAndPost(canvas);
}
handler.removeCallbacks(drawRunner);
if (visible) {
handler.postDelayed(drawRunner, 100);
}
}
}
}
增加了一个更多的时间
BallsContainer
抽奖方法:
public void Draw(Canvas canvas, int width, int height) {
Iterator<Ball> iter = balls.iterator();
while(iter.hasNext()) {
Ball b = iter.next();
b.Move(width, height);
b.Draw(canvas);
}
}
而且Ball
抽奖方法:
public void Draw(Canvas canvas) {
canvas.drawCircle(pos.x, pos.y, radius, paint);
}
@ cricket_007'LiveWallpaperListAdapter'不是我的课 - 它是Android。 – Ircover
啊,现在看。尽管如此,请添加任何代码在您的AsyncTask –
@ cricket_007我没有'AsyncTask's - 它都在Androids壁纸选择器内。 – Ircover