android.view.WindowManager$BadTokenException

1、android.view.WindowManager$BadTokenException: Unable to add window -- token nul

在Activity中newSpinner是我把mContext传入，但是出了android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application这个错误，参考了达人的文章终于搞定。

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private Context mcontext;

@Override

protected void onCreate(Bundle savedInstanceState) {mcontext = getApplicationContext();

System.out.println("mcontext=" + mcontext);

}

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new AlertDialog.Builder(mcontext)

.setIcon(android.R.drawable.ic_dialog_alert)

.setTitle("Warnning")

.setMessage(

"You forget to write the message. Do you want to fill out it ??")

.setPositiveButton("Yes", positiveListener).setNegativeButton(

"No", negativeListener).create().show();

导致报这个错是在于new AlertDialog.Builder(mcontext)，虽然这里的参数是AlertDialog.Builder(Context context)但我们不能使用getApplicationContext()获得的Context,而必须使用Activity,因为只有一个Activity才能添加一个窗体。

解决方法：将new AlertDialog.Builder(Context context)中的参数用Activity.this（Activity是你的Activity的名称）来填充就可以正确的创建一个Dialog了。

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new AlertDialog.Builder(MyActivity.this)

.setIcon(android.R.drawable.ic_dialog_alert)

.setTitle("Warnning")

.setMessage(

"You forget to write the message. Do you want to fill out it ??")

.setPositiveButton("Yes", positiveListener).setNegativeButton(

"No", negativeListener).create().show();

2、token null is not valid; is your activity running?

popuwindows使用时出现异常：

android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?

解决方法：

应把pop.showAtLocation(parent, Gravity.TOP,0, 0)这一句移出oncreate方法，在控件渲染完毕后再使用