ProgressDialog.setCanceledOnTouchOutside(false);

用ProgressDialog的地方，最好加下这个属性，防止4.0系统出问题。mProgressDialog.setCanceledOnTouchOutside(false);

就是在loading的时候，如果你触摸屏幕其它区域，就会让这个progressDialog消失，然后可能出现崩溃问题，如下：

 

09-28 11:21:09.476: E/AndroidRuntime(20934): FATAL EXCEPTION: main
09-28 11:21:09.476: E/AndroidRuntime(20934): java.lang.IllegalArgumentException: View not attached to window manager
09-28 11:21:09.476: E/AndroidRuntime(20934):  at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:653)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:349)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at android.view.WindowManagerImpl$CompatModeWrapper.removeView(WindowManagerImpl.java:160)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at android.app.Dialog.dismissDialog(Dialog.java:319)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at android.app.Dialog.dismiss(Dialog.java:302)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at com.renren.mobile.flok.ui.login.ai.run(Unknown Source)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at android.os.Handler.handleCallback(Handler.java:615)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at android.os.Handler.dispatchMessage(Handler.java:92)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at android.os.Looper.loop(Looper.java:137)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at android.app.ActivityThread.main(ActivityThread.java:4899)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at java.lang.reflect.Method.invokeNative(Native Method)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at java.lang.reflect.Method.invoke(Method.java:511)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
09-28 11:21:09.476: E/AndroidRuntime(20934):  at dalvik.system.NativeStart.main(Native Method)
 
 
 一个崩溃问题（4.0以上dialog问题）