我有一张运行正常的动态壁纸。我想为它添加一个设置活动,所以当我去动态壁纸选择器时,我完成了所有必需的步骤和设置按钮。但是,当我单击设置按钮时,我得到以下异常。
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)
这是引起异常的代码,到目前为止一直工作正常(导致异常的行已被指示):
/** 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();
}
}
sequences.get(i).draw()
方法如下
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;
}
在我看来,这是唯一相关的代码,但如果你想看到更多,我可以在这里发布(请在downvoting之前询问)。此外,整个代码可在Github here上找到。
答案 0 :(得分:6)
在过去的几周里,我一定花了10多个小时来处理这个问题,但我终于明白了。
创建SettingsActivity时,壁纸不再可见,但仍会尝试在曲面上绘制。我更改了底部的if语句来包装整个绘制函数,所以当它不可见时我不会尝试绘制表面。这解决了我的问题。
希望这可以节省一些人浪费尽可能多的时间。