在动态壁纸选择器 Android 3.0 中旋转设备时出现 IllegalArgumentException

Question

我正在为 Honeycomb 3.0 开发动态壁纸，但出现随机错误。

当我处于壁纸选择器（带有“设置壁纸”和“设置...”按钮的窗口，以了解）并且显示动态壁纸时，如果我旋转设备，壁纸应该重新加载配置适应新的方向。有时会，有时会崩溃。

该错误在某种程度上与 BaseSurfaceHolder.unlockCanvasAndPost 方法相关，但我真的不知道问题所在。我认为它无法正确加载某些资源。

以下是错误日志：

07-21 16:07:38.490: WARN/WindowManager(292): java.lang.IllegalArgumentException: Requested window android.os.BinderProxy@40d19f28 does not exist
07-21 16:07:38.490: WARN/WindowManager(292):     at com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:6731)
07-21 16:07:38.490: WARN/WindowManager(292):     at com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:6722)
07-21 16:07:38.490: WARN/WindowManager(292):     at com.android.server.wm.WindowManagerService.removeWindow(WindowManagerService.java:2414)
07-21 16:07:38.490: WARN/WindowManager(292):     at com.android.server.wm.Session.remove(Session.java:149)
07-21 16:07:38.490: WARN/WindowManager(292):     at android.view.IWindowSession$Stub.onTransact(IWindowSession.java:120)
07-21 16:07:38.490: WARN/WindowManager(292):     at com.android.server.wm.Session.onTransact(Session.java:111)
07-21 16:07:38.490: WARN/WindowManager(292):     at android.os.Binder.execTransact(Binder.java:320)
07-21 16:07:38.490: WARN/WindowManager(292):     at dalvik.system.NativeStart.run(Native Method)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768): FATAL EXCEPTION: main
07-21 16:07:38.490: ERROR/AndroidRuntime(20768): java.lang.IllegalArgumentException
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at android.view.Surface.unlockCanvasAndPost(Native Method)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at com.android.internal.view.BaseSurfaceHolder.unlockCanvasAndPost(BaseSurfaceHolder.java:215)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at mx.livewallpaper.clock.CubeWallpaper1$CubeEngine.drawFrame(CubeWallpaper1.java:686)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at mx.livewallpaper.clock.CubeWallpaper1$CubeEngine$1.run(CubeWallpaper1.java:292)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at android.os.Handler.handleCallback(Handler.java:587)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at android.os.Handler.dispatchMessage(Handler.java:92)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at android.os.Looper.loop(Looper.java:132)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at android.app.ActivityThread.main(ActivityThread.java:4028)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at java.lang.reflect.Method.invokeNative(Native Method)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at java.lang.reflect.Method.invoke(Method.java:491)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
07-21 16:07:38.490: ERROR/AndroidRuntime(20768):     at dalvik.system.NativeStart.main(Native Method)
07-21 16:07:38.500: ERROR/android.os.Debug(292): Dumpstate > /data/log/dumpstate_app_error

编辑：下面的代码是第 686 行的 drawFrame() 方法：

void drawFrame() {
            final SurfaceHolder holder = getSurfaceHolder();

            Canvas c = null;
            try {
                c = holder.lockCanvas();
                if (c != null) {

                    drawLogo3(c);
                }
            } finally {
                if (c != null) holder.unlockCanvasAndPost(c);
            }

这是所有动态壁纸中存在的默认方法，我从 Android SDK 的 CubeWallpaper 动态壁纸示例中获取了它。

编辑2：

听起来像是缓冲区错误。如果我将帧速率设置为 10fps 而不是 40fps，动态壁纸选择器根本不会崩溃。是否可以仅为活动“动态壁纸选择器”编辑动态壁纸行为？

Answer 1

在破坏表面之前先连接螺纹

@Override
public void onSurfaceDestroyed(SurfaceHolder holder)
{
    try 
    {
        updater.join();
    } 
    catch (InterruptedException e) 
    {

    }
    super.onSurfaceDestroyed(holder);
}

Answer 2

当你改变设备的方向时，函数“onsurfacechange()”被调用。你必须在那里做一些事情。我猜当你改变方向时，“surfaceholder”也改变了。我这样做：

@Override
        public void onSurfaceChanged(SurfaceHolder holder, int format,
                int width, int height) {
                        int lockwidth = 0;
            int lockheight = 0;
            mholder = holder;
            try {

                canvas = mholder.lockCanvas();
                lockwidth = canvas.getWidth();
                lockheight = canvas.getHeight();
                if (width > height) {
                    Utils.Width = lockheight;
                    Utils.screenWidth = lockheight;
                    Utils.screenHeight = lockwidth;
                    Utils.isWidth = true;
                    if (width == 1280 && height == 720 && lockwidth == 800
                            && lockheight == 480) {
                        Utils.screenWidth = 480;
                        Utils.screenHeight = 854;
                    }
                } else {
                    Utils.Width = lockwidth;
                    Utils.screenWidth = lockwidth;
                    Utils.screenHeight = lockheight;
                    Utils.isWidth = false;
                    if (width == 720 && height == 1280 && lockwidth == 480
                            && lockheight == 800) {
                        Utils.screenWidth = 480;
                        Utils.screenHeight = 854;
                    }
                }
                mholder.unlockCanvasAndPost(canvas);
            } catch (Exception e) {
            }
            Utils.rateX = (float) Utils.Width / (float) Utils.FLA_Width;
            Utils.ratio = Utils.screenWidth / Utils.FLA_Width;
            Utils.Width = lockwidth;
            Utils.Height = lockheight;
        }