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我在使用 android 版本 2.3.3 的设备和模拟器上遇到错误，但在使用 Android 版本 4 的设备和模拟器上 - 没有错误... LogCat 说：

 08-12 19:07:45.182: E/AndroidRuntime(352): FATAL EXCEPTION: main
08-12 19:07:45.182: E/AndroidRuntime(352): java.lang.NullPointerException
08-12 19:07:45.182: E/AndroidRuntime(352):  at android.app.WallpaperManager.setBitmap(WallpaperManager.java:484)
08-12 19:07:45.182: E/AndroidRuntime(352):  at com.zznob.lwpchanger.SWpJob$ParseSite.onPostExecute(SWpJob.java:96)
08-12 19:07:45.182: E/AndroidRuntime(352):  at com.zznob.lwpchanger.SWpJob$ParseSite.onPostExecute(SWpJob.java:1)
08-12 19:07:45.182: E/AndroidRuntime(352):  at android.os.AsyncTask.finish(AsyncTask.java:417)
08-12 19:07:45.182: E/AndroidRuntime(352):  at android.os.AsyncTask.access$300(AsyncTask.java:127)
08-12 19:07:45.182: E/AndroidRuntime(352):  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
08-12 19:07:45.182: E/AndroidRuntime(352):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-12 19:07:45.182: E/AndroidRuntime(352):  at android.os.Looper.loop(Looper.java:123)
08-12 19:07:45.182: E/AndroidRuntime(352):  at android.app.ActivityThread.main(ActivityThread.java:3683)
08-12 19:07:45.182: E/AndroidRuntime(352):  at java.lang.reflect.Method.invokeNative(Native Method)
08-12 19:07:45.182: E/AndroidRuntime(352):  at java.lang.reflect.Method.invoke(Method.java:507)
08-12 19:07:45.182: E/AndroidRuntime(352):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-12 19:07:45.182: E/AndroidRuntime(352):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-12 19:07:45.182: E/AndroidRuntime(352):  at dalvik.system.NativeStart.main(Native Method)

有错误的代码：

protected void onPostExecute(Bitmap bitmap)
        {
            if(!isCancelled()){
                try{
                    wallpaperManager.setBitmap(bitmap); <- Error on Android version 2.2-2.3
                }
                catch(IOException e){
                    e.printStackTrace();
                }
            }
            super.onPostExecute(bitmap);
        }

使用 API 版本 8 构建...知道吗？

类完整代码 - http://pastebin.com/iwgYbPfb

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