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/*
* 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 mIsSafeToCommitTransactions;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mIsSafeToCommitTransactions = true;
}
@Override
protected void onStart() {
super.onStart();
mIsSafeToCommitTransactions = true;
}
@Override
protected void onResume() {
super.onResume();
mIsSafeToCommitTransactions = true;
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mIsSafeToCommitTransactions = 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.
*
* <p>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 mIsSafeToCommitTransactions;
}
}
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