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