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      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