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      1 /*
      2  * Copyright (C) 2015 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 package com.android.dialer.app.settings;
     17 
     18 import android.content.res.Configuration;
     19 import android.os.Bundle;
     20 import android.preference.PreferenceActivity;
     21 import android.support.v7.app.ActionBar;
     22 import android.support.v7.app.AppCompatDelegate;
     23 import android.support.v7.widget.Toolbar;
     24 import android.view.MenuInflater;
     25 import android.view.View;
     26 import android.view.ViewGroup;
     27 
     28 /**
     29  * A {@link android.preference.PreferenceActivity} which implements and proxies the necessary calls
     30  * to be used with AppCompat.
     31  */
     32 public class AppCompatPreferenceActivity extends PreferenceActivity {
     33 
     34   private AppCompatDelegate mDelegate;
     35 
     36   private boolean mIsSafeToCommitTransactions;
     37 
     38   @Override
     39   protected void onCreate(Bundle savedInstanceState) {
     40     getDelegate().installViewFactory();
     41     getDelegate().onCreate(savedInstanceState);
     42     super.onCreate(savedInstanceState);
     43     mIsSafeToCommitTransactions = true;
     44   }
     45 
     46   @Override
     47   protected void onPostCreate(Bundle savedInstanceState) {
     48     super.onPostCreate(savedInstanceState);
     49     getDelegate().onPostCreate(savedInstanceState);
     50   }
     51 
     52   public ActionBar getSupportActionBar() {
     53     return getDelegate().getSupportActionBar();
     54   }
     55 
     56   public void setSupportActionBar(Toolbar toolbar) {
     57     getDelegate().setSupportActionBar(toolbar);
     58   }
     59 
     60   @Override
     61   public MenuInflater getMenuInflater() {
     62     return getDelegate().getMenuInflater();
     63   }
     64 
     65   @Override
     66   public void setContentView(int layoutResID) {
     67     getDelegate().setContentView(layoutResID);
     68   }
     69 
     70   @Override
     71   public void setContentView(View view) {
     72     getDelegate().setContentView(view);
     73   }
     74 
     75   @Override
     76   public void setContentView(View view, ViewGroup.LayoutParams params) {
     77     getDelegate().setContentView(view, params);
     78   }
     79 
     80   @Override
     81   public void addContentView(View view, ViewGroup.LayoutParams params) {
     82     getDelegate().addContentView(view, params);
     83   }
     84 
     85   @Override
     86   protected void onPostResume() {
     87     super.onPostResume();
     88     getDelegate().onPostResume();
     89   }
     90 
     91   @Override
     92   protected void onTitleChanged(CharSequence title, int color) {
     93     super.onTitleChanged(title, color);
     94     getDelegate().setTitle(title);
     95   }
     96 
     97   @Override
     98   public void onConfigurationChanged(Configuration newConfig) {
     99     super.onConfigurationChanged(newConfig);
    100     getDelegate().onConfigurationChanged(newConfig);
    101   }
    102 
    103   @Override
    104   protected void onStop() {
    105     super.onStop();
    106     getDelegate().onStop();
    107   }
    108 
    109   @Override
    110   protected void onDestroy() {
    111     super.onDestroy();
    112     getDelegate().onDestroy();
    113   }
    114 
    115   @Override
    116   public void invalidateOptionsMenu() {
    117     getDelegate().invalidateOptionsMenu();
    118   }
    119 
    120   private AppCompatDelegate getDelegate() {
    121     if (mDelegate == null) {
    122       mDelegate = AppCompatDelegate.create(this, null);
    123     }
    124     return mDelegate;
    125   }
    126 
    127   @Override
    128   protected void onStart() {
    129     super.onStart();
    130     mIsSafeToCommitTransactions = true;
    131   }
    132 
    133   @Override
    134   protected void onResume() {
    135     super.onResume();
    136     mIsSafeToCommitTransactions = true;
    137   }
    138 
    139   @Override
    140   protected void onSaveInstanceState(Bundle outState) {
    141     super.onSaveInstanceState(outState);
    142     mIsSafeToCommitTransactions = false;
    143   }
    144 
    145   /**
    146    * Returns true if it is safe to commit {@link FragmentTransaction}s at this time, based on
    147    * whether {@link Activity#onSaveInstanceState} has been called or not.
    148    *
    149    * <p>Make sure that the current activity calls into {@link super.onSaveInstanceState(Bundle
    150    * outState)} (if that method is overridden), so the flag is properly set.
    151    */
    152   public boolean isSafeToCommitTransactions() {
    153     return mIsSafeToCommitTransactions;
    154   }
    155 }
    156