/
MonitorVolumeKeyPress.java
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/
MonitorVolumeKeyPress.java
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/*
* Copyright 2014 Google Inc. All Rights Reserved.
*
* 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 com.zuluindia.watchpresenter;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.wifi.WifiManager;
import android.os.IBinder;
import android.os.PowerManager;
import android.os.Vibrator;
import android.support.v4.app.NotificationManagerCompat;
import android.util.Log;
import com.zuluindia.watchpresenter.common.Constants;
import java.util.Timer;
import java.util.TimerTask;
/**
* This service's purpose is to play an inaudible audio in the background.
*
* That way, we can detect volume key's presses with a Receiver.
*/
public class MonitorVolumeKeyPress extends Service{
private static final String LOGCAT = null;
MediaPlayer objPlayer;
WifiManager.WifiLock wifiLock = null;
private static final String ACTION_VOLUME_KEY_PRESS = "android.media.VOLUME_CHANGED_ACTION";
private static final long SWITCH_OFF_DELAY = 3600000;
private static final long KEEP_ALIVE_PERIOD = 60000;
private static final long[] VIBRATION_PATTERN_FORWARD = {0,40};
private static final long[] VIBRATION_PATTERN_BACKWARDS = {0,40,20,40};
private AudioManager audioManager;
private int midVolume;
private Timer timer;
private Vibrator vibrator;
private SharedPreferences settings;
private BroadcastReceiver volumeKeysReceiver = new BroadcastReceiver() {
private static final long DUPLICATE_TIME = 400;
private long lastEvent = 0;
@Override
public void onReceive(Context context, Intent intent) {
Intent i = new Intent(SendMessageReceiver.INTENT);
final long currentEvent = System.currentTimeMillis();
int newVolume =
(Integer)intent.getExtras().get("android.media.EXTRA_VOLUME_STREAM_VALUE");
if(newVolume != midVolume) {
if (currentEvent - lastEvent > DUPLICATE_TIME) {
String message;
long[] vibrationPattern;
if(newVolume != 0 && (newVolume >= midVolume)){
message = Constants.NEXT_SLIDE_MESSAGE;
vibrationPattern = VIBRATION_PATTERN_FORWARD;
}
else{
message = Constants.PREV_SLIDE_MESSAGE;
vibrationPattern = VIBRATION_PATTERN_BACKWARDS;
}
if(settings.getBoolean(Constants.PREF_VIBRATION, true)) {
vibrator.vibrate(vibrationPattern, -1);
}
i.putExtra(Constants.EXTRA_MESSAGE, message);
context.sendBroadcast(i);
scheduleMaintenance();
} else {
Log.d(Constants.LOG_TAG, "Duplicate volume event discarded");
}
resetVolume();
}
else{
Log.d(Constants.LOG_TAG,
"Discarded volume changed event generated by volume reset");
}
lastEvent = currentEvent;
}
};
public void onCreate(){
super.onCreate();
settings = getSharedPreferences(Constants.SETTINGS_NAME,MODE_PRIVATE);
vibrator = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
Log.d(LOGCAT, "Service Started!");
objPlayer = MediaPlayer.create(this, com.zuluindia.watchpresenter.R.raw.silence);
objPlayer.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);
objPlayer.setLooping(true);
timer = new Timer();
audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
midVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC)/2;
resetVolume();
}
private void resetVolume(){
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,midVolume,0);
}
public int onStartCommand(Intent intent, int flags, int startId) {
startMonitoring();
return 1;
}
@Override
public void onDestroy(){
Log.d(Constants.LOG_TAG, "destroying KeyPress monitor service");
stopMonitoring();
}
@Override
public IBinder onBind(Intent objIndent) {
return null;
}
private void startMonitoring(){
wifiLock = ((WifiManager) getSystemService(Context.WIFI_SERVICE))
.createWifiLock(WifiManager.WIFI_MODE_FULL, "WatchPresenterLock");
wifiLock.acquire();
objPlayer.start();
registerReceiver(volumeKeysReceiver, new IntentFilter(ACTION_VOLUME_KEY_PRESS));
Log.d(LOGCAT, "Media Player started!");
if(objPlayer.isLooping() != true){
Log.d(LOGCAT, "Problem in Playing Audio");
}
scheduleMaintenance();
}
private void stopMonitoring(){
objPlayer.stop();
wifiLock.release();
objPlayer.release();
cancelMaintenance();
unregisterReceiver(volumeKeysReceiver);
}
private synchronized void scheduleMaintenance(){
if(timer != null){
timer.cancel();
}
timer = new Timer();
timer.schedule(new TimerTask(){
@Override
public void run() {
if(MainActivity.active == false) {
Log.d(Constants.LOG_TAG, "Timeout, stopping keypress monitoring service...");
NotificationManagerCompat notificationManager =
NotificationManagerCompat.from(MonitorVolumeKeyPress.this);
// Build the notification and issues it with notification manager.
notificationManager.cancel(MainActivity.PRESENTING_NOTIFICATION_ID);
(new WearController(MonitorVolumeKeyPress.this)).stopGestureDetection();
stopSelf();
}
else{
Log.d(Constants.LOG_TAG, "Timeout, but MainActivity in foreground. Not stopping");
}
}
}, SWITCH_OFF_DELAY);
timer.schedule(new TimerTask() {
@Override
public void run() {
Intent i = new Intent(SendMessageReceiver.INTENT);
i.putExtra(Constants.EXTRA_MESSAGE, Constants.WARMUP_MESSAGE);
sendBroadcast(i);
}
}, KEEP_ALIVE_PERIOD, KEEP_ALIVE_PERIOD) ;
}
private synchronized void cancelMaintenance(){
if(timer != null){
timer.cancel();
}
}
}