错误: android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@435def20 is not valid; is your activity running? at android.view.ViewRoot.setView...... 发生环境: 在一个tabActivity里面嵌套一个tabAcitivity, 如果在子tabActivity里面显示AlertDialog的话,就会引发此错误。在1.5上. 解决方法: AlertDialog.Builder(xxx.this) => AlertDialog.Builder(this.getParent()) 来自: http://hi.baidu.com/webtalk/blog/item/74ac84cb5125e4f353664fe6.html