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1 /*
2  * Copyright (C) 2016 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.contacts.activities;
18 
19 import android.os.Bundle;
20 import androidx.appcompat.app.AppCompatActivity;
21 
22 /**
23  * A common superclass that keeps track of whether an {@link AppCompatActivity} has saved its state
24  * yet or not, copied from {@link TransactionSafeActivity},
25  * which will be deprecated after Kitkat backporting is done.
26  */
27 public abstract class AppCompatTransactionSafeActivity extends AppCompatActivity {
28 
29     private boolean mIsSafeToCommitTransactions;
30 
31     @Override
onCreate(Bundle savedInstanceState)32     protected void onCreate(Bundle savedInstanceState) {
33         super.onCreate(savedInstanceState);
34         mIsSafeToCommitTransactions = true;
35     }
36 
37     @Override
onStart()38     protected void onStart() {
39         super.onStart();
40         mIsSafeToCommitTransactions = true;
41     }
42 
43     @Override
onResume()44     protected void onResume() {
45         super.onResume();
46         mIsSafeToCommitTransactions = true;
47     }
48 
49     @Override
onSaveInstanceState(Bundle outState)50     protected void onSaveInstanceState(Bundle outState) {
51         super.onSaveInstanceState(outState);
52         mIsSafeToCommitTransactions = false;
53     }
54 
55     /**
56      * Returns true if it is safe to commit {@link FragmentTransaction}s at this time, based on
57      * whether {@link FragmentActivity#onSaveInstanceState} has been called or not.
58      *
59      * Make sure that the current activity calls into
60      * {@link super.onSaveInstanceState(Bundle outState)} (if that method is overridden),
61      * so the flag is properly set.
62      */
isSafeToCommitTransactions()63     public boolean isSafeToCommitTransactions() {
64         return mIsSafeToCommitTransactions;
65     }
66 }
67