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