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      1 /*
      2  * Copyright (C) 2014 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.ContentResolver;
     20 import android.content.Context;
     21 import android.media.AudioManager;
     22 import android.net.Uri;
     23 import android.preference.PreferenceManager;
     24 import android.preference.SeekBarPreference;
     25 import android.preference.SeekBarVolumizer;
     26 import android.util.AttributeSet;
     27 import android.util.Log;
     28 import android.view.View;
     29 import android.widget.ImageView;
     30 import android.widget.SeekBar;
     31 
     32 import com.android.settings.R;
     33 
     34 /** A slider preference that directly controls an audio stream volume (no dialog) **/
     35 public class VolumeSeekBarPreference extends SeekBarPreference
     36         implements PreferenceManager.OnActivityStopListener {
     37     private static final String TAG = "VolumeSeekBarPreference";
     38 
     39     private int mStream;
     40     private SeekBar mSeekBar;
     41     private SeekBarVolumizer mVolumizer;
     42     private Callback mCallback;
     43     private ImageView mIconView;
     44 
     45     public VolumeSeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr,
     46             int defStyleRes) {
     47         super(context, attrs, defStyleAttr, defStyleRes);
     48     }
     49 
     50     public VolumeSeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr) {
     51         this(context, attrs, defStyleAttr, 0);
     52     }
     53 
     54     public VolumeSeekBarPreference(Context context, AttributeSet attrs) {
     55         this(context, attrs, 0);
     56     }
     57 
     58     public VolumeSeekBarPreference(Context context) {
     59         this(context, null);
     60     }
     61 
     62     public void setStream(int stream) {
     63         mStream = stream;
     64     }
     65 
     66     public void setCallback(Callback callback) {
     67         mCallback = callback;
     68     }
     69 
     70     @Override
     71     public void onActivityStop() {
     72         if (mVolumizer != null) {
     73             mVolumizer.stop();
     74         }
     75     }
     76 
     77     @Override
     78     protected void onBindView(View view) {
     79         super.onBindView(view);
     80         if (mStream == 0) {
     81             Log.w(TAG, "No stream found, not binding volumizer");
     82             return;
     83         }
     84         getPreferenceManager().registerOnActivityStopListener(this);
     85         final SeekBar seekBar = (SeekBar) view.findViewById(com.android.internal.R.id.seekbar);
     86         if (seekBar == mSeekBar) return;
     87         mSeekBar = seekBar;
     88         final SeekBarVolumizer.Callback sbvc = new SeekBarVolumizer.Callback() {
     89             @Override
     90             public void onSampleStarting(SeekBarVolumizer sbv) {
     91                 if (mCallback != null) {
     92                     mCallback.onSampleStarting(sbv);
     93                 }
     94             }
     95         };
     96         final Uri sampleUri = mStream == AudioManager.STREAM_MUSIC ? getMediaVolumeUri() : null;
     97         if (mVolumizer == null) {
     98             mVolumizer = new SeekBarVolumizer(getContext(), mStream, sampleUri, sbvc) {
     99                 // we need to piggyback on SBV's SeekBar listener to update our icon
    100                 @Override
    101                 public void onProgressChanged(SeekBar seekBar, int progress,
    102                         boolean fromTouch) {
    103                     super.onProgressChanged(seekBar, progress, fromTouch);
    104                     mCallback.onStreamValueChanged(mStream, progress);
    105                 }
    106             };
    107         }
    108         mVolumizer.setSeekBar(mSeekBar);
    109         mIconView = (ImageView) view.findViewById(com.android.internal.R.id.icon);
    110         mCallback.onStreamValueChanged(mStream, mSeekBar.getProgress());
    111     }
    112 
    113     // during initialization, this preference is the SeekBar listener
    114     @Override
    115     public void onProgressChanged(SeekBar seekBar, int progress,
    116             boolean fromTouch) {
    117         super.onProgressChanged(seekBar, progress, fromTouch);
    118         mCallback.onStreamValueChanged(mStream, progress);
    119     }
    120 
    121     public void showIcon(int resId) {
    122         // Instead of using setIcon, which will trigger listeners, this just decorates the
    123         // preference temporarily with a new icon.
    124         if (mIconView != null) {
    125             mIconView.setImageResource(resId);
    126         }
    127     }
    128 
    129     private Uri getMediaVolumeUri() {
    130         return Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://"
    131                 + getContext().getPackageName()
    132                 + "/" + R.raw.media_volume);
    133     }
    134 
    135     public interface Callback {
    136         void onSampleStarting(SeekBarVolumizer sbv);
    137         void onStreamValueChanged(int stream, int progress);
    138     }
    139 }
    140