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.notification.VolumeSeekBarPreference.Callback; 23 import com.android.settingslib.core.lifecycle.Lifecycle; 24 import com.android.settingslib.core.lifecycle.LifecycleObserver; 25 import com.android.settingslib.core.lifecycle.events.OnPause; 26 import com.android.settingslib.core.lifecycle.events.OnResume; 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 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 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 58 public void onResume() { 59 if (mPreference != null) { 60 mPreference.onActivityResume(); 61 } 62 } 63 64 @Override 65 public void onPause() { 66 if (mPreference != null) { 67 mPreference.onActivityPause(); 68 } 69 } 70 71 protected abstract int getAudioStream(); 72 73 protected abstract int getMuteIcon(); 74 75 } 76