對話框警告我想通過AlertDialogManager
類顯示一個警告對話框到non-activity
類DeviceAdminReceiverSample
的方法onDisabled
,但每當我通過這個方法調用alertDialog
它與下面的文本顯示從非活性類的Android
錯誤
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
我知道這個問題是與context
的事情,但我不知道該怎麼把那裏,以便它的工作,我想this
,getApplicationContext()
但都是徒勞的。我的兩個類的代碼如下
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);
}
創建一個DialogActivity。 –
使用活動對象而不是上下文對象。 – Ajay