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 17package com.android.dialer.activity; 18 19import android.app.Activity; 20import android.os.Bundle; 21 22import com.android.dialerbind.analytics.AnalyticsActivity; 23 24/** 25 * A common superclass that keeps track of whether an {@link Activity} has saved its state yet or 26 * not. 27 */ 28public abstract class TransactionSafeActivity extends AnalyticsActivity { 29 30 private boolean mIsSafeToCommitTransactions; 31 32 @Override 33 protected void onCreate(Bundle savedInstanceState) { 34 super.onCreate(savedInstanceState); 35 mIsSafeToCommitTransactions = true; 36 } 37 38 @Override 39 protected void onStart() { 40 super.onStart(); 41 mIsSafeToCommitTransactions = true; 42 } 43 44 @Override 45 protected void onResume() { 46 super.onResume(); 47 mIsSafeToCommitTransactions = true; 48 } 49 50 @Override 51 protected void onSaveInstanceState(Bundle outState) { 52 super.onSaveInstanceState(outState); 53 mIsSafeToCommitTransactions = false; 54 } 55 56 /** 57 * Returns true if it is safe to commit {@link FragmentTransaction}s at this time, based on 58 * whether {@link Activity#onSaveInstanceState} has been called or not. 59 * 60 * Make sure that the current activity calls into 61 * {@link super.onSaveInstanceState(Bundle outState)} (if that method is overridden), 62 * so the flag is properly set. 63 */ 64 public boolean isSafeToCommitTransactions() { 65 return mIsSafeToCommitTransactions; 66 } 67} 68