core/java/android/preference/SeekBarVolumizer.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package android.preference;

 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.database.ContentObserver;
 import android.media.AudioManager;
 import android.media.Ringtone;
 import android.media.RingtoneManager;
 import android.net.Uri;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Message;
 import android.preference.VolumePreference.VolumeStore;
 import android.provider.Settings;
 import android.provider.Settings.System;
 import android.util.Log;
 import android.widget.SeekBar;
 import android.widget.SeekBar.OnSeekBarChangeListener;

 /**
  * Turns a {@link SeekBar} into a volume control.
  * @hide
  */
 public class SeekBarVolumizer implements OnSeekBarChangeListener, Handler.Callback {
     private static final String TAG = "SeekBarVolumizer";

     public interface Callback {
         void onSampleStarting(SeekBarVolumizer sbv);
         void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch);
         void onMuted(boolean muted);
     }

     private final Context mContext;
     private final H mUiHandler = new H();
     private final Callback mCallback;
     private final Uri mDefaultUri;
     private final AudioManager mAudioManager;
     private final int mStreamType;
     private final int mMaxStreamVolume;
     private boolean mAffectedByRingerMode;
     private boolean mNotificationOrRing;
     private final Receiver mReceiver = new Receiver();

     private Handler mHandler;
     private Observer mVolumeObserver;
     private int mOriginalStreamVolume;
     private Ringtone mRingtone;
     private int mLastProgress = -1;
     private boolean mMuted;
     private SeekBar mSeekBar;
     private int mVolumeBeforeMute = -1;
     private int mRingerMode;

     private static final int MSG_SET_STREAM_VOLUME = 0;
     private static final int MSG_START_SAMPLE = 1;
     private static final int MSG_STOP_SAMPLE = 2;
     private static final int MSG_INIT_SAMPLE = 3;
     private static final int CHECK_RINGTONE_PLAYBACK_DELAY_MS = 1000;

     public SeekBarVolumizer(Context context, int streamType, Uri defaultUri, Callback callback) {
         mContext = context;
         mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
         mStreamType = streamType;
         mAffectedByRingerMode = mAudioManager.isStreamAffectedByRingerMode(mStreamType);
         mNotificationOrRing = isNotificationOrRing(mStreamType);
         if (mNotificationOrRing) {
             mRingerMode = mAudioManager.getRingerModeInternal();
         }
         mMaxStreamVolume = mAudioManager.getStreamMaxVolume(mStreamType);
         mCallback = callback;
         mOriginalStreamVolume = mAudioManager.getStreamVolume(mStreamType);
         mMuted = mAudioManager.isStreamMute(mStreamType);
         if (mCallback != null) {
             mCallback.onMuted(mMuted);
         }
         if (defaultUri == null) {
             if (mStreamType == AudioManager.STREAM_RING) {
                 defaultUri = Settings.System.DEFAULT_RINGTONE_URI;
             } else if (mStreamType == AudioManager.STREAM_NOTIFICATION) {
                 defaultUri = Settings.System.DEFAULT_NOTIFICATION_URI;
             } else {
                 defaultUri = Settings.System.DEFAULT_ALARM_ALERT_URI;
             }
         }
         mDefaultUri = defaultUri;
     }

     private static boolean isNotificationOrRing(int stream) {
         return stream == AudioManager.STREAM_RING || stream == AudioManager.STREAM_NOTIFICATION;
     }

     public void setSeekBar(SeekBar seekBar) {
         if (mSeekBar != null) {
             mSeekBar.setOnSeekBarChangeListener(null);
         }
         mSeekBar = seekBar;
         mSeekBar.setOnSeekBarChangeListener(null);
         mSeekBar.setMax(mMaxStreamVolume);
         updateSeekBar();
         mSeekBar.setOnSeekBarChangeListener(this);
     }

     protected void updateSeekBar() {
         if (mNotificationOrRing && mRingerMode == AudioManager.RINGER_MODE_VIBRATE) {
             mSeekBar.setEnabled(true);
             mSeekBar.setProgress(0);
         } else if (mMuted) {
             mSeekBar.setEnabled(false);
             mSeekBar.setProgress(0);
         } else {
             mSeekBar.setEnabled(true);
             mSeekBar.setProgress(mLastProgress > -1 ? mLastProgress : mOriginalStreamVolume);
         }
     }

     @Override
     public boolean handleMessage(Message msg) {
         switch (msg.what) {
             case MSG_SET_STREAM_VOLUME:
                 mAudioManager.setStreamVolume(mStreamType, mLastProgress,
                         AudioManager.FLAG_SHOW_UI_WARNINGS);
                 break;
             case MSG_START_SAMPLE:
                 onStartSample();
                 break;
             case MSG_STOP_SAMPLE:
                 onStopSample();
                 break;
             case MSG_INIT_SAMPLE:
                 onInitSample();
                 break;
             default:
                 Log.e(TAG, "invalid SeekBarVolumizer message: "+msg.what);
         }
         return true;
     }

     private void onInitSample() {
         mRingtone = RingtoneManager.getRingtone(mContext, mDefaultUri);
         if (mRingtone != null) {
             mRingtone.setStreamType(mStreamType);
         }
     }

     private void postStartSample() {
         if (mHandler == null) return;
         mHandler.removeMessages(MSG_START_SAMPLE);
         mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_START_SAMPLE),
                 isSamplePlaying() ? CHECK_RINGTONE_PLAYBACK_DELAY_MS : 0);
     }

     private void onStartSample() {
         if (!isSamplePlaying()) {
             if (mCallback != null) {
                 mCallback.onSampleStarting(this);
             }
             if (mRingtone != null) {
                 try {
                     mRingtone.play();
                 } catch (Throwable e) {
                     Log.w(TAG, "Error playing ringtone, stream " + mStreamType, e);
                 }
             }
         }
     }

     private void postStopSample() {
         if (mHandler == null) return;
         // remove pending delayed start messages
         mHandler.removeMessages(MSG_START_SAMPLE);
         mHandler.removeMessages(MSG_STOP_SAMPLE);
         mHandler.sendMessage(mHandler.obtainMessage(MSG_STOP_SAMPLE));
     }

     private void onStopSample() {
         if (mRingtone != null) {
             mRingtone.stop();
         }
     }

     public void stop() {
         if (mHandler == null) return;  // already stopped
         postStopSample();
         mContext.getContentResolver().unregisterContentObserver(mVolumeObserver);
         mReceiver.setListening(false);
         mSeekBar.setOnSeekBarChangeListener(null);
         mHandler.getLooper().quitSafely();
         mHandler = null;
         mVolumeObserver = null;
     }

     public void start() {
         if (mHandler != null) return;  // already started
         HandlerThread thread = new HandlerThread(TAG + ".CallbackHandler");
         thread.start();
         mHandler = new Handler(thread.getLooper(), this);
         mHandler.sendEmptyMessage(MSG_INIT_SAMPLE);
         mVolumeObserver = new Observer(mHandler);
         mContext.getContentResolver().registerContentObserver(
                 System.getUriFor(System.VOLUME_SETTINGS[mStreamType]),
                 false, mVolumeObserver);
         mReceiver.setListening(true);
     }

     public void revertVolume() {
         mAudioManager.setStreamVolume(mStreamType, mOriginalStreamVolume, 0);
     }

     public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
         if (fromTouch) {
             postSetVolume(progress);
         }
         if (mCallback != null) {
             mCallback.onProgressChanged(seekBar, progress, fromTouch);
         }
     }

     private void postSetVolume(int progress) {
         if (mHandler == null) return;
         // Do the volume changing separately to give responsive UI
         mLastProgress = progress;
         mHandler.removeMessages(MSG_SET_STREAM_VOLUME);
         mHandler.sendMessage(mHandler.obtainMessage(MSG_SET_STREAM_VOLUME));
     }

     public void onStartTrackingTouch(SeekBar seekBar) {
     }

     public void onStopTrackingTouch(SeekBar seekBar) {
         postStartSample();
     }

     public boolean isSamplePlaying() {
         return mRingtone != null && mRingtone.isPlaying();
     }

     public void startSample() {
         postStartSample();
     }

     public void stopSample() {
         postStopSample();
     }

     public SeekBar getSeekBar() {
         return mSeekBar;
     }

     public void changeVolumeBy(int amount) {
         mSeekBar.incrementProgressBy(amount);
         postSetVolume(mSeekBar.getProgress());
         postStartSample();
         mVolumeBeforeMute = -1;
     }

     public void muteVolume() {
         if (mVolumeBeforeMute != -1) {
             mSeekBar.setProgress(mVolumeBeforeMute);
             postSetVolume(mVolumeBeforeMute);
             postStartSample();
             mVolumeBeforeMute = -1;
         } else {
             mVolumeBeforeMute = mSeekBar.getProgress();
             mSeekBar.setProgress(0);
             postStopSample();
             postSetVolume(0);
         }
     }

     public void onSaveInstanceState(VolumeStore volumeStore) {
         if (mLastProgress >= 0) {
             volumeStore.volume = mLastProgress;
             volumeStore.originalVolume = mOriginalStreamVolume;
         }
     }

     public void onRestoreInstanceState(VolumeStore volumeStore) {
         if (volumeStore.volume != -1) {
             mOriginalStreamVolume = volumeStore.originalVolume;
             mLastProgress = volumeStore.volume;
             postSetVolume(mLastProgress);
         }
     }

     private final class H extends Handler {
         private static final int UPDATE_SLIDER = 1;

         @Override
         public void handleMessage(Message msg) {
             if (msg.what == UPDATE_SLIDER) {
                 if (mSeekBar != null) {
                     mLastProgress = msg.arg1;
                     final boolean muted = msg.arg2 != 0;
                     if (muted != mMuted) {
                         mMuted = muted;
                         if (mCallback != null) {
                             mCallback.onMuted(mMuted);
                         }
                     }
                     updateSeekBar();
                 }
             }
         }

         public void postUpdateSlider(int volume, boolean mute) {
             obtainMessage(UPDATE_SLIDER, volume, mute ? 1 : 0).sendToTarget();
         }
     }

     private void updateSlider() {
         if (mSeekBar != null && mAudioManager != null) {
             final int volume = mAudioManager.getStreamVolume(mStreamType);
             final boolean mute = mAudioManager.isStreamMute(mStreamType);
             mUiHandler.postUpdateSlider(volume, mute);
         }
     }

     private final class Observer extends ContentObserver {
         public Observer(Handler handler) {
             super(handler);
         }

         @Override
         public void onChange(boolean selfChange) {
             super.onChange(selfChange);
             updateSlider();
         }
     }

     private final class Receiver extends BroadcastReceiver {
         private boolean mListening;

         public void setListening(boolean listening) {
             if (mListening == listening) return;
             mListening = listening;
             if (listening) {
                 final IntentFilter filter = new IntentFilter(AudioManager.VOLUME_CHANGED_ACTION);
                 filter.addAction(AudioManager.INTERNAL_RINGER_MODE_CHANGED_ACTION);
                 mContext.registerReceiver(this, filter);
             } else {
                 mContext.unregisterReceiver(this);
             }
         }

         @Override
         public void onReceive(Context context, Intent intent) {
             final String action = intent.getAction();
             if (AudioManager.VOLUME_CHANGED_ACTION.equals(action)) {
                 int streamType = intent.getIntExtra(AudioManager.EXTRA_VOLUME_STREAM_TYPE, -1);
                 int streamValue = intent.getIntExtra(AudioManager.EXTRA_VOLUME_STREAM_VALUE, -1);
                 final boolean streamMatch = mNotificationOrRing ? isNotificationOrRing(streamType)
                         : (streamType == mStreamType);
                 if (mSeekBar != null && streamMatch && streamValue != -1) {
                     final boolean muted = mAudioManager.isStreamMute(mStreamType);
                     mUiHandler.postUpdateSlider(streamValue, muted);
                 }
             } else if (AudioManager.INTERNAL_RINGER_MODE_CHANGED_ACTION.equals(action)) {
                 if (mNotificationOrRing) {
                     mRingerMode = mAudioManager.getRingerModeInternal();
                 }
                 if (mAffectedByRingerMode) {
                     updateSlider();
                 }
             }
         }
     }
 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package android.preference;

	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.database.ContentObserver;
	import android.media.AudioManager;
	import android.media.Ringtone;
	import android.media.RingtoneManager;
	import android.net.Uri;
	import android.os.Handler;
	import android.os.HandlerThread;
	import android.os.Message;
	import android.preference.VolumePreference.VolumeStore;
	import android.provider.Settings;
	import android.provider.Settings.System;
	import android.util.Log;
	import android.widget.SeekBar;
	import android.widget.SeekBar.OnSeekBarChangeListener;

	/**
	* Turns a {@link SeekBar} into a volume control.
	* @hide
	*/
	public class SeekBarVolumizer implements OnSeekBarChangeListener, Handler.Callback {
	private static final String TAG = "SeekBarVolumizer";

	public interface Callback {
	void onSampleStarting(SeekBarVolumizer sbv);
	void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch);
	void onMuted(boolean muted);
	}

	private final Context mContext;
	private final H mUiHandler = new H();
	private final Callback mCallback;
	private final Uri mDefaultUri;
	private final AudioManager mAudioManager;
	private final int mStreamType;
	private final int mMaxStreamVolume;
	private boolean mAffectedByRingerMode;
	private boolean mNotificationOrRing;
	private final Receiver mReceiver = new Receiver();

	private Handler mHandler;
	private Observer mVolumeObserver;
	private int mOriginalStreamVolume;
	private Ringtone mRingtone;
	private int mLastProgress = -1;
	private boolean mMuted;
	private SeekBar mSeekBar;
	private int mVolumeBeforeMute = -1;
	private int mRingerMode;

	private static final int MSG_SET_STREAM_VOLUME = 0;
	private static final int MSG_START_SAMPLE = 1;
	private static final int MSG_STOP_SAMPLE = 2;
	private static final int MSG_INIT_SAMPLE = 3;
	private static final int CHECK_RINGTONE_PLAYBACK_DELAY_MS = 1000;

	public SeekBarVolumizer(Context context, int streamType, Uri defaultUri, Callback callback) {
	mContext = context;
	mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
	mStreamType = streamType;
	mAffectedByRingerMode = mAudioManager.isStreamAffectedByRingerMode(mStreamType);
	mNotificationOrRing = isNotificationOrRing(mStreamType);
	if (mNotificationOrRing) {
	mRingerMode = mAudioManager.getRingerModeInternal();
	}
	mMaxStreamVolume = mAudioManager.getStreamMaxVolume(mStreamType);
	mCallback = callback;
	mOriginalStreamVolume = mAudioManager.getStreamVolume(mStreamType);
	mMuted = mAudioManager.isStreamMute(mStreamType);
	if (mCallback != null) {
	mCallback.onMuted(mMuted);
	}
	if (defaultUri == null) {
	if (mStreamType == AudioManager.STREAM_RING) {
	defaultUri = Settings.System.DEFAULT_RINGTONE_URI;
	} else if (mStreamType == AudioManager.STREAM_NOTIFICATION) {
	defaultUri = Settings.System.DEFAULT_NOTIFICATION_URI;
	} else {
	defaultUri = Settings.System.DEFAULT_ALARM_ALERT_URI;
	}
	}
	mDefaultUri = defaultUri;
	}

	private static boolean isNotificationOrRing(int stream) {
	return stream == AudioManager.STREAM_RING \|\| stream == AudioManager.STREAM_NOTIFICATION;
	}

	public void setSeekBar(SeekBar seekBar) {
	if (mSeekBar != null) {
	mSeekBar.setOnSeekBarChangeListener(null);
	}
	mSeekBar = seekBar;
	mSeekBar.setOnSeekBarChangeListener(null);
	mSeekBar.setMax(mMaxStreamVolume);
	updateSeekBar();
	mSeekBar.setOnSeekBarChangeListener(this);
	}

	protected void updateSeekBar() {
	if (mNotificationOrRing && mRingerMode == AudioManager.RINGER_MODE_VIBRATE) {
	mSeekBar.setEnabled(true);
	mSeekBar.setProgress(0);
	} else if (mMuted) {
	mSeekBar.setEnabled(false);
	mSeekBar.setProgress(0);
	} else {
	mSeekBar.setEnabled(true);
	mSeekBar.setProgress(mLastProgress > -1 ? mLastProgress : mOriginalStreamVolume);
	}
	}

	@Override
	public boolean handleMessage(Message msg) {
	switch (msg.what) {
	case MSG_SET_STREAM_VOLUME:
	mAudioManager.setStreamVolume(mStreamType, mLastProgress,
	AudioManager.FLAG_SHOW_UI_WARNINGS);
	break;
	case MSG_START_SAMPLE:
	onStartSample();
	break;
	case MSG_STOP_SAMPLE:
	onStopSample();
	break;
	case MSG_INIT_SAMPLE:
	onInitSample();
	break;
	default:
	Log.e(TAG, "invalid SeekBarVolumizer message: "+msg.what);
	}
	return true;
	}

	private void onInitSample() {
	mRingtone = RingtoneManager.getRingtone(mContext, mDefaultUri);
	if (mRingtone != null) {
	mRingtone.setStreamType(mStreamType);
	}
	}

	private void postStartSample() {
	if (mHandler == null) return;
	mHandler.removeMessages(MSG_START_SAMPLE);
	mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_START_SAMPLE),
	isSamplePlaying() ? CHECK_RINGTONE_PLAYBACK_DELAY_MS : 0);
	}

	private void onStartSample() {
	if (!isSamplePlaying()) {
	if (mCallback != null) {
	mCallback.onSampleStarting(this);
	}
	if (mRingtone != null) {
	try {
	mRingtone.play();
	} catch (Throwable e) {
	Log.w(TAG, "Error playing ringtone, stream " + mStreamType, e);
	}
	}
	}
	}

	private void postStopSample() {
	if (mHandler == null) return;
	// remove pending delayed start messages
	mHandler.removeMessages(MSG_START_SAMPLE);
	mHandler.removeMessages(MSG_STOP_SAMPLE);
	mHandler.sendMessage(mHandler.obtainMessage(MSG_STOP_SAMPLE));
	}

	private void onStopSample() {
	if (mRingtone != null) {
	mRingtone.stop();
	}
	}

	public void stop() {
	if (mHandler == null) return; // already stopped
	postStopSample();
	mContext.getContentResolver().unregisterContentObserver(mVolumeObserver);
	mReceiver.setListening(false);
	mSeekBar.setOnSeekBarChangeListener(null);
	mHandler.getLooper().quitSafely();
	mHandler = null;
	mVolumeObserver = null;
	}

	public void start() {
	if (mHandler != null) return; // already started
	HandlerThread thread = new HandlerThread(TAG + ".CallbackHandler");
	thread.start();
	mHandler = new Handler(thread.getLooper(), this);
	mHandler.sendEmptyMessage(MSG_INIT_SAMPLE);
	mVolumeObserver = new Observer(mHandler);
	mContext.getContentResolver().registerContentObserver(
	System.getUriFor(System.VOLUME_SETTINGS[mStreamType]),
	false, mVolumeObserver);
	mReceiver.setListening(true);
	}

	public void revertVolume() {
	mAudioManager.setStreamVolume(mStreamType, mOriginalStreamVolume, 0);
	}

	public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
	if (fromTouch) {
	postSetVolume(progress);
	}
	if (mCallback != null) {
	mCallback.onProgressChanged(seekBar, progress, fromTouch);
	}
	}

	private void postSetVolume(int progress) {
	if (mHandler == null) return;
	// Do the volume changing separately to give responsive UI
	mLastProgress = progress;
	mHandler.removeMessages(MSG_SET_STREAM_VOLUME);
	mHandler.sendMessage(mHandler.obtainMessage(MSG_SET_STREAM_VOLUME));
	}

	public void onStartTrackingTouch(SeekBar seekBar) {
	}

	public void onStopTrackingTouch(SeekBar seekBar) {
	postStartSample();
	}

	public boolean isSamplePlaying() {
	return mRingtone != null && mRingtone.isPlaying();
	}

	public void startSample() {
	postStartSample();
	}

	public void stopSample() {
	postStopSample();
	}

	public SeekBar getSeekBar() {
	return mSeekBar;
	}

	public void changeVolumeBy(int amount) {
	mSeekBar.incrementProgressBy(amount);
	postSetVolume(mSeekBar.getProgress());
	postStartSample();
	mVolumeBeforeMute = -1;
	}

	public void muteVolume() {
	if (mVolumeBeforeMute != -1) {
	mSeekBar.setProgress(mVolumeBeforeMute);
	postSetVolume(mVolumeBeforeMute);
	postStartSample();
	mVolumeBeforeMute = -1;
	} else {
	mVolumeBeforeMute = mSeekBar.getProgress();
	mSeekBar.setProgress(0);
	postStopSample();
	postSetVolume(0);
	}
	}

	public void onSaveInstanceState(VolumeStore volumeStore) {
	if (mLastProgress >= 0) {
	volumeStore.volume = mLastProgress;
	volumeStore.originalVolume = mOriginalStreamVolume;
	}
	}

	public void onRestoreInstanceState(VolumeStore volumeStore) {
	if (volumeStore.volume != -1) {
	mOriginalStreamVolume = volumeStore.originalVolume;
	mLastProgress = volumeStore.volume;
	postSetVolume(mLastProgress);
	}
	}

	private final class H extends Handler {
	private static final int UPDATE_SLIDER = 1;

	@Override
	public void handleMessage(Message msg) {
	if (msg.what == UPDATE_SLIDER) {
	if (mSeekBar != null) {
	mLastProgress = msg.arg1;
	final boolean muted = msg.arg2 != 0;
	if (muted != mMuted) {
	mMuted = muted;
	if (mCallback != null) {
	mCallback.onMuted(mMuted);
	}
	}
	updateSeekBar();
	}
	}
	}

	public void postUpdateSlider(int volume, boolean mute) {
	obtainMessage(UPDATE_SLIDER, volume, mute ? 1 : 0).sendToTarget();
	}
	}

	private void updateSlider() {
	if (mSeekBar != null && mAudioManager != null) {
	final int volume = mAudioManager.getStreamVolume(mStreamType);
	final boolean mute = mAudioManager.isStreamMute(mStreamType);
	mUiHandler.postUpdateSlider(volume, mute);
	}
	}

	private final class Observer extends ContentObserver {
	public Observer(Handler handler) {
	super(handler);
	}

	@Override
	public void onChange(boolean selfChange) {
	super.onChange(selfChange);
	updateSlider();
	}
	}

	private final class Receiver extends BroadcastReceiver {
	private boolean mListening;

	public void setListening(boolean listening) {
	if (mListening == listening) return;
	mListening = listening;
	if (listening) {
	final IntentFilter filter = new IntentFilter(AudioManager.VOLUME_CHANGED_ACTION);
	filter.addAction(AudioManager.INTERNAL_RINGER_MODE_CHANGED_ACTION);
	mContext.registerReceiver(this, filter);
	} else {
	mContext.unregisterReceiver(this);
	}
	}

	@Override
	public void onReceive(Context context, Intent intent) {
	final String action = intent.getAction();
	if (AudioManager.VOLUME_CHANGED_ACTION.equals(action)) {
	int streamType = intent.getIntExtra(AudioManager.EXTRA_VOLUME_STREAM_TYPE, -1);
	int streamValue = intent.getIntExtra(AudioManager.EXTRA_VOLUME_STREAM_VALUE, -1);
	final boolean streamMatch = mNotificationOrRing ? isNotificationOrRing(streamType)
	: (streamType == mStreamType);
	if (mSeekBar != null && streamMatch && streamValue != -1) {
	final boolean muted = mAudioManager.isStreamMute(mStreamType);
	mUiHandler.postUpdateSlider(streamValue, muted);
	}
	} else if (AudioManager.INTERNAL_RINGER_MODE_CHANGED_ACTION.equals(action)) {
	if (mNotificationOrRing) {
	mRingerMode = mAudioManager.getRingerModeInternal();
	}
	if (mAffectedByRingerMode) {
	updateSlider();
	}
	}
	}
	}
	}