Crash:ProgressDialog does not dismiss,but activity is destory

Crash:ProgressDialog doesn't dismiss,but activity is destory 

Exception information:

09-26 13:48:01.777: E/AndroidRuntime(9523): FATAL EXCEPTION: main
09-26 13:48:01.777: E/AndroidRuntime(9523): android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@4078a5e8 is not valid; is your activity running?
09-26 13:48:01.777: E/AndroidRuntime(9523): at android.view.ViewRoot.setView(ViewRoot.java:529)
09-26 13:48:01.777: E/AndroidRuntime(9523): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
09-26 13:48:01.777: E/AndroidRuntime(9523): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
09-26 13:48:01.777: E/AndroidRuntime(9523): at android.view.Window$LocalWindowManager.addView(Window.java:424)
09-26 13:48:01.777: E/AndroidRuntime(9523): at android.app.Dialog.show(Dialog.java:241)
09-26 13:48:01.777: E/AndroidRuntime(9523): at 包名及方法名(Unknown Source)
09-26 13:48:01.777: E/AndroidRuntime(9523): at android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:281)
09-26 13:48:01.777: E/AndroidRuntime(9523): at android.os.Handler.dispatchMessage(Handler.java:99)
09-26 13:48:01.777: E/AndroidRuntime(9523): at android.os.Looper.loop(Looper.java:130)
09-26 13:48:01.777: E/AndroidRuntime(9523): at android.app.ActivityThread.main(ActivityThread.java:3694)
09-26 13:48:01.777: E/AndroidRuntime(9523): at java.lang.reflect.Method.invokeNative(Native Method)
09-26 13:48:01.777: E/AndroidRuntime(9523): at java.lang.reflect.Method.invoke(Method.java:507)
09-26 13:48:01.777: E/AndroidRuntime(9523): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
09-26 13:48:01.777: E/AndroidRuntime(9523): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
09-26 13:48:01.777: E/AndroidRuntime(9523): at dalvik.system.NativeStart.main(Native Method)

解决方法：

如果不是Activity强转成Activity，否则直接判断isFinishing()方法。

try{
 if(((Activity)Context).isFinishing() == false){
 xxx.show();
 }
}catch(Exception e){
 e.printStackTrace();
}