我希望能够通过AlertDialogManager
类在DeviceAdminReceiverSample
的onDisabled
方法中展示一个警报对话框,但每当我通过该方法调用alertDialog
时,它都会生成以下文本的错误:
错误
06-12 12:01:19.923: E/AndroidRuntime(468): FATAL EXCEPTION: main
06-12 12:01:19.923: E/AndroidRuntime(468): java.lang.RuntimeException: Unable to start
receiver com.android.remotewipedata.DeviceAdminReceiverSample:
android.view.WindowManager$BadTokenException: Unable to add window -- token null is not
for an application
我知道问题出在context
这个东西上,但是我不知道应该放什么进去才能让它工作。我试过了this
和getApplicationContext()
,但都没有用。我两个类的代码都放在下面了。
AlertDialogManager
public class AlertDialogManager {
public void showAlertDialog(Context context, String title, String message,
Boolean status) {
final AlertDialog alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle(title);
alertDialog.setMessage(message);
if (status != null)
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
alertDialog.dismiss();
}
});
alertDialog.show();
}
}
DeviceAdminReceiverSample
public class DeviceAdminReceiverSample extends DeviceAdminReceiver {
static final String TAG = "DeviceAdminReceiver";
AlertDialogManager alert = new AlertDialogManager();
/** Called when this application is no longer the device administrator. */
@Override
public void onDisabled(Context context, Intent intent) {
super.onDisabled(context, intent);
Toast.makeText(context, R.string.device_admin_disabled,
Toast.LENGTH_LONG).show();
// intent.putExtra("dialogMessage", "Device admin has been disabled");
// intent.setClass(context, DialogActivity.class);
// intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// context.startActivity(intent);
alert.showAlertDialog(context, "Alert",
"Device admin has been disabled", true);
}