Home | History | Annotate | Download | only in activities 
      1 /*
      2  * Copyright (C) 2016 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 
     17 package com.android.contacts.activities;
     18 
     19 import android.os.Bundle;
     20 import android.support.v7.app.AppCompatActivity;
     21 
     22 /**
     23  * A common superclass that keeps track of whether an {@link AppCompatActivity} has saved its state
     24  * yet or not, copied from {@link TransactionSafeActivity},
     25  * which will be deprecated after Kitkat backporting is done.
     26  */
     27 public abstract class AppCompatTransactionSafeActivity extends AppCompatActivity {
     28 
     29     private boolean mIsSafeToCommitTransactions;
     30 
     31     @Override
     32     protected void onCreate(Bundle savedInstanceState) {
     33         super.onCreate(savedInstanceState);
     34         mIsSafeToCommitTransactions = true;
     35     }
     36 
     37     @Override
     38     protected void onStart() {
     39         super.onStart();
     40         mIsSafeToCommitTransactions = true;
     41     }
     42 
     43     @Override
     44     protected void onResume() {
     45         super.onResume();
     46         mIsSafeToCommitTransactions = true;
     47     }
     48 
     49     @Override
     50     protected void onSaveInstanceState(Bundle outState) {
     51         super.onSaveInstanceState(outState);
     52         mIsSafeToCommitTransactions = false;
     53     }
     54 
     55     /**
     56      * Returns true if it is safe to commit {@link FragmentTransaction}s at this time, based on
     57      * whether {@link FragmentActivity#onSaveInstanceState} has been called or not.
     58      *
     59      * Make sure that the current activity calls into
     60      * {@link super.onSaveInstanceState(Bundle outState)} (if that method is overridden),
     61      * so the flag is properly set.
     62      */
     63     public boolean isSafeToCommitTransactions() {
     64         return mIsSafeToCommitTransactions;
     65     }
     66 }
     67