1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.tv.settings.dialog;
18 
19 import android.app.Activity;
20 
21 import androidx.fragment.app.DialogFragment;
22 
23 /**
24  * Provides the safe dismiss feature regardless of the DialogFragment's life cycle.
25  */
26 public class SafeDismissDialogFragment extends DialogFragment {
27     private boolean mAttached = false;
28     private boolean mDismissPending = false;
29 
30     @Override
onAttach(Activity activity)31     public void onAttach(Activity activity) {
32         super.onAttach(activity);
33         mAttached = true;
34         if (mDismissPending) {
35             mDismissPending = false;
36             dismiss();
37             return;
38         }
39     }
40 
41     @Override
onDetach()42     public void onDetach() {
43         mAttached = false;
44         super.onDetach();
45     }
46 
47     /**
48      * Dismiss safely regardless of the DialogFragment's life cycle.
49      */
50     @Override
dismiss()51     public void dismiss() {
52         if (!mAttached) {
53             // dismiss() before getFragmentManager() is set cause NPE in dismissInternal().
54             // FragmentMananager is set when a fragment is used in a trasaction,
55             // so wait here until we can dismiss safely.
56             mDismissPending = true;
57         } else {
58             super.dismiss();
59         }
60     }
61 }
62