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/*
* 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.Context;
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 {
public interface Callback {
void onSampleStarting(SeekBarVolumizer sbv);
}
private Context mContext;
private Handler mHandler;
private final Callback mCallback;
private AudioManager mAudioManager;
private int mStreamType;
private int mOriginalStreamVolume;
private Ringtone mRingtone;
private int mLastProgress = -1;
private SeekBar mSeekBar;
private int mVolumeBeforeMute = -1;
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 CHECK_RINGTONE_PLAYBACK_DELAY_MS = 1000;
private ContentObserver mVolumeObserver = new ContentObserver(mHandler) {
@Override
public void onChange(boolean selfChange) {
super.onChange(selfChange);
if (mSeekBar != null && mAudioManager != null) {
int volume = mAudioManager.getStreamVolume(mStreamType);
mSeekBar.setProgress(volume);
}
}
};
public SeekBarVolumizer(Context context, SeekBar seekBar, int streamType, Uri defaultUri,
Callback callback) {
mContext = context;
mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
mStreamType = streamType;
mSeekBar = seekBar;
HandlerThread thread = new HandlerThread(VolumePreference.TAG + ".CallbackHandler");
thread.start();
mHandler = new Handler(thread.getLooper(), this);
mCallback = callback;
initSeekBar(seekBar, defaultUri);
}
private void initSeekBar(SeekBar seekBar, Uri defaultUri) {
seekBar.setMax(mAudioManager.getStreamMaxVolume(mStreamType));
mOriginalStreamVolume = mAudioManager.getStreamVolume(mStreamType);
seekBar.setProgress(mOriginalStreamVolume);
seekBar.setOnSeekBarChangeListener(this);
mContext.getContentResolver().registerContentObserver(
System.getUriFor(System.VOLUME_SETTINGS[mStreamType]),
false, mVolumeObserver);
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;
}
}
mRingtone = RingtoneManager.getRingtone(mContext, defaultUri);
if (mRingtone != null) {
mRingtone.setStreamType(mStreamType);
}
}
@Override
public boolean handleMessage(Message msg) {
switch (msg.what) {
case MSG_SET_STREAM_VOLUME:
mAudioManager.setStreamVolume(mStreamType, mLastProgress, 0);
break;
case MSG_START_SAMPLE:
onStartSample();
break;
case MSG_STOP_SAMPLE:
onStopSample();
break;
default:
Log.e(VolumePreference.TAG, "invalid SeekBarVolumizer message: "+msg.what);
}
return true;
}
private void postStartSample() {
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) {
mRingtone.play();
}
}
}
void postStopSample() {
// 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() {
postStopSample();
mContext.getContentResolver().unregisterContentObserver(mVolumeObserver);
mSeekBar.setOnSeekBarChangeListener(null);
}
public void revertVolume() {
mAudioManager.setStreamVolume(mStreamType, mOriginalStreamVolume, 0);
}
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromTouch) {
if (!fromTouch) {
return;
}
postSetVolume(progress);
}
void postSetVolume(int progress) {
// 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);
}
}
}
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