/*
* 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();
}
}
}
}
}
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