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.settings.notification;
18 
19 import android.content.Context;
20 import android.support.v7.preference.PreferenceScreen;
21 
22 import com.android.settings.core.lifecycle.Lifecycle;
23 import com.android.settings.core.lifecycle.LifecycleObserver;
24 import com.android.settings.core.lifecycle.events.OnPause;
25 import com.android.settings.core.lifecycle.events.OnResume;
26 import com.android.settings.notification.VolumeSeekBarPreference.Callback;
27 
28 /**
29  * Base class for preference controller that handles VolumeSeekBarPreference
30  */
31 public abstract class VolumeSeekBarPreferenceController extends
32         AdjustVolumeRestrictedPreferenceController implements LifecycleObserver, OnResume, OnPause {
33 
34     protected VolumeSeekBarPreference mPreference;
35     protected VolumeSeekBarPreference.Callback mVolumePreferenceCallback;
36 
VolumeSeekBarPreferenceController(Context context, Callback callback, Lifecycle lifecycle)37     public VolumeSeekBarPreferenceController(Context context, Callback callback,
38             Lifecycle lifecycle) {
39         super(context);
40         mVolumePreferenceCallback = callback;
41         if (lifecycle != null) {
42             lifecycle.addObserver(this);
43         }
44     }
45 
46     @Override
displayPreference(PreferenceScreen screen)47     public void displayPreference(PreferenceScreen screen) {
48         super.displayPreference(screen);
49         if (isAvailable()) {
50             mPreference = (VolumeSeekBarPreference) screen.findPreference(getPreferenceKey());
51             mPreference.setCallback(mVolumePreferenceCallback);
52             mPreference.setStream(getAudioStream());
53             mPreference.setMuteIcon(getMuteIcon());
54         }
55     }
56 
57     @Override
onResume()58     public void onResume() {
59         if (mPreference != null) {
60             mPreference.onActivityResume();
61         }
62     }
63 
64     @Override
onPause()65     public void onPause() {
66         if (mPreference != null) {
67             mPreference.onActivityPause();
68         }
69     }
70 
getAudioStream()71     protected abstract int getAudioStream();
72 
getMuteIcon()73     protected abstract int getMuteIcon();
74 
75 }
76