Eric Erfanian | ccca315 | 2017-02-22 16:32:36 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2011 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.incallui; |
| 18 | |
| 19 | import android.os.Bundle; |
| 20 | import android.support.v4.app.FragmentActivity; |
| 21 | |
| 22 | /** |
| 23 | * A common superclass that keeps track of whether an {@link Activity} has saved its state yet or |
| 24 | * not. |
| 25 | */ |
| 26 | public abstract class TransactionSafeFragmentActivity extends FragmentActivity { |
| 27 | |
| 28 | private boolean mIsSafeToCommitTransactions; |
| 29 | |
| 30 | @Override |
| 31 | protected void onCreate(Bundle savedInstanceState) { |
| 32 | super.onCreate(savedInstanceState); |
| 33 | mIsSafeToCommitTransactions = true; |
| 34 | } |
| 35 | |
| 36 | @Override |
| 37 | protected void onStart() { |
| 38 | super.onStart(); |
| 39 | mIsSafeToCommitTransactions = true; |
| 40 | } |
| 41 | |
| 42 | @Override |
| 43 | protected void onResume() { |
| 44 | super.onResume(); |
| 45 | mIsSafeToCommitTransactions = true; |
| 46 | } |
| 47 | |
| 48 | @Override |
| 49 | protected void onSaveInstanceState(Bundle outState) { |
| 50 | super.onSaveInstanceState(outState); |
| 51 | mIsSafeToCommitTransactions = false; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Returns true if it is safe to commit {@link FragmentTransaction}s at this time, based on |
| 56 | * whether {@link Activity#onSaveInstanceState} has been called or not. |
| 57 | * |
| 58 | * <p>Make sure that the current activity calls into {@link super.onSaveInstanceState(Bundle |
| 59 | * outState)} (if that method is overridden), so the flag is properly set. |
| 60 | */ |
| 61 | public boolean isSafeToCommitTransactions() { |
| 62 | return mIsSafeToCommitTransactions; |
| 63 | } |
| 64 | } |