dialog中出现异常android.view.WindowManager$BadTokenException

异常:

android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@21e8fa73 is not valid; is your activity running?
at android.view.ViewRootImpl.setView(ViewRootImpl.java:595)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:282)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:325)
at net.haoku.feizhuan.common.web.JSBase.alert(JSBase.java:176)
at net.haoku.feizhuan.common.web.JSBase.access$100(JSBase.java:46)
at net.haoku.feizhuan.common.web.JSBase$1.handleMessage(JSBase.java:111)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5564)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

其中下面这三句是我项目里的:

at net.haoku.feizhuan.common.web.JSBase.alert(JSBase.java:176)
at net.haoku.feizhuan.common.web.JSBase.access$100(JSBase.java:46)
at net.haoku.feizhuan.common.web.JSBase$1.handleMessage(JSBase.java:111)

错误分析:

Dialog在show的时候必须要有一个activity作为窗口载体，上面的日志的意思是承载Dialog的activity已经被销毁了，不存在了

解决办法:

1、在show之前加判断activity是否被销毁了

if(!isFinishing()){
dialog.show();
}

2、在onDestroy中把dialog也给关掉

protected void onDestroy() {
if (dialog != null) {
if (dialog.isShowing()) {
dialog.dismiss();
}
}
super.onDestroy();
}

更多异常可以参考:http://www.android100.org/html/201507/03/161221.html