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Diffstat (limited to 'src/com/android/dialer/TransactionSafeActivity.java')
-rw-r--r-- | src/com/android/dialer/TransactionSafeActivity.java | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/com/android/dialer/TransactionSafeActivity.java b/src/com/android/dialer/TransactionSafeActivity.java new file mode 100644 index 000000000..81e50128d --- /dev/null +++ b/src/com/android/dialer/TransactionSafeActivity.java @@ -0,0 +1,65 @@ +/* + * 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.dialer; + +import android.app.Activity; +import android.os.Bundle; +import android.support.v7.app.AppCompatActivity; + +/** + * A common superclass that keeps track of whether an {@link Activity} has saved its state yet or + * not. + */ +public abstract class TransactionSafeActivity extends AppCompatActivity { + + 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. + * + * 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; + } +} |