/* * Copyright (C) 2011 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.incallui; import android.os.Bundle; import android.support.v4.app.FragmentActivity; /** * A common superclass that keeps track of whether an {@link Activity} has saved its state yet or * not. */ public abstract class TransactionSafeFragmentActivity extends FragmentActivity { private boolean isSafeToCommitTransactions; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); isSafeToCommitTransactions = true; } @Override protected void onStart() { super.onStart(); isSafeToCommitTransactions = true; } @Override protected void onResume() { super.onResume(); isSafeToCommitTransactions = true; } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); isSafeToCommitTransactions = false; } /** * Returns true if it is safe to commit {@link FragmentTransaction}s at this time, based on * whether {@link Activity#onSaveInstanceState} has been called or not. * *
Make sure that the current activity calls into {@link super.onSaveInstanceState(Bundle * outState)} (if that method is overridden), so the flag is properly set. */ public boolean isSafeToCommitTransactions() { return isSafeToCommitTransactions; } }