AlertDialog show的時候會報錯：token null is not for an application

AlertDialog show的時候會報錯：

E/AndroidRuntime(921): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

    AlertDialog.Builder builder;    builder = new AlertDialog.Builder(this.getApplicationContext());        LayoutInflater inflater = getLayoutInflater();//(LayoutInflater) myContext.getSystemService(LAYOUT_INFLATER_SERVICE);          View layout = inflater.inflate(R.layout.my_dialog, (ViewGroup) findViewById(R.id.my_dialog_layout_root));        builder.setView(layout);        //builder.create();        builder.show();

問題就出在

this.getApplicationContext()

上。換成this就正常了。

參考：

http://stackoverflow.com/questions/2634991/android-1-6-android-view-windowmanagerbadtokenexception-unable-to-add-window

http://lipeng88213.iteye.com/blog/835180

http://aijiawang-126-com.iteye.com/blog/662336