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.arch.lifecycle.LifecycleObserver; 20 import android.arch.lifecycle.OnLifecycleEvent; 21 import android.content.Context; 22 import android.support.v7.preference.PreferenceScreen; 23 24 import com.android.internal.annotations.VisibleForTesting; 25 import com.android.settings.notification.VolumeSeekBarPreference.Callback; 26 import com.android.settingslib.core.lifecycle.Lifecycle; 27 28 /** 29 * Base class for preference controller that handles VolumeSeekBarPreference 30 */ 31 public abstract class VolumeSeekBarPreferenceController extends 32 AdjustVolumeRestrictedPreferenceController implements LifecycleObserver { 33 34 protected VolumeSeekBarPreference mPreference; 35 protected VolumeSeekBarPreference.Callback mVolumePreferenceCallback; 36 protected AudioHelper mHelper; 37 VolumeSeekBarPreferenceController(Context context, String key)38 public VolumeSeekBarPreferenceController(Context context, String key) { 39 super(context, key); 40 setAudioHelper(new AudioHelper(context)); 41 } 42 43 @VisibleForTesting setAudioHelper(AudioHelper helper)44 void setAudioHelper(AudioHelper helper) { 45 mHelper = helper; 46 } 47 setCallback(Callback callback)48 public void setCallback(Callback callback) { 49 mVolumePreferenceCallback = callback; 50 } 51 52 @Override displayPreference(PreferenceScreen screen)53 public void displayPreference(PreferenceScreen screen) { 54 super.displayPreference(screen); 55 if (isAvailable()) { 56 mPreference = (VolumeSeekBarPreference) screen.findPreference(getPreferenceKey()); 57 mPreference.setCallback(mVolumePreferenceCallback); 58 mPreference.setStream(getAudioStream()); 59 mPreference.setMuteIcon(getMuteIcon()); 60 } 61 } 62 63 @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) onResume()64 public void onResume() { 65 if (mPreference != null) { 66 mPreference.onActivityResume(); 67 } 68 } 69 70 @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) onPause()71 public void onPause() { 72 if (mPreference != null) { 73 mPreference.onActivityPause(); 74 } 75 } 76 77 @Override getSliderPosition()78 public int getSliderPosition() { 79 if (mPreference != null) { 80 return mPreference.getProgress(); 81 } 82 return mHelper.getStreamVolume(getAudioStream()); 83 } 84 85 @Override setSliderPosition(int position)86 public boolean setSliderPosition(int position) { 87 if (mPreference != null) { 88 mPreference.setProgress(position); 89 } 90 return mHelper.setStreamVolume(getAudioStream(), position); 91 } 92 93 @Override getMaxSteps()94 public int getMaxSteps() { 95 if (mPreference != null) { 96 return mPreference.getMax(); 97 } 98 return mHelper.getMaxVolume(getAudioStream()); 99 } 100 getAudioStream()101 protected abstract int getAudioStream(); 102 getMuteIcon()103 protected abstract int getMuteIcon(); 104 105 } 106