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 import android.app.DialogFragment;
21 
22 /**
23  * Provides the safe dismiss feature regardless of the DialogFragment's life cycle.
24  */
25 public class SafeDismissDialogFragment extends DialogFragment {
26     private boolean mAttached = false;
27     private boolean mDismissPending = false;
28 
29     @Override
onAttach(Activity activity)30     public void onAttach(Activity activity) {
31         super.onAttach(activity);
32         mAttached = true;
33         if (mDismissPending) {
34             mDismissPending = false;
35             dismiss();
36             return;
37         }
38     }
39 
40     @Override
onDetach()41     public void onDetach() {
42         mAttached = false;
43         super.onDetach();
44     }
45 
46     /**
47      * Dismiss safely regardless of the DialogFragment's life cycle.
48      */
49     @Override
dismiss()50     public void dismiss() {
51         if (!mAttached) {
52             // dismiss() before getFragmentManager() is set cause NPE in dismissInternal().
53             // FragmentMananager is set when a fragment is used in a trasaction,
54             // so wait here until we can dismiss safely.
55             mDismissPending = true;
56         } else {
57             super.dismiss();
58         }
59     }
60 }
61