how can I select to send the data in time intervals that the user will define
TimerとTimerTaskを使用できます。時間間隔のユーザー入力を受け取り、Timer のschedule()に渡します。考慮すべきことは、アプリが閉じられたとき、またはユーザーが時間間隔を変更したときに、以前の TimerTask をキャンセルして、タイマーがあれば削除することです。
アラームの場合、アクティビティ クラスで次の操作を行います。
PendingIntent Sender = null;
Intent AlarmIntent = new Intent("com.example.gpstrackdemo.RECEIVEALARM");
AlarmManager AlmMgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Sender = PendingIntent.getBroadcast(GpsTrackActivity.this, 0,
AlarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);
AlmMgr.setRepeating(AlarmManager.RTC_WAKEUP, 0, 15 * 60 * 1000,
Sender);
AlarmIntent はBroadcastReceiverのインテントです。そのコードは次のとおりです。
public class StartServiceReceiver extends BroadcastReceiver
{
private static final String TAG = "StartServiceReceiver";
@Override
public void onReceive(Context context, Intent intent)
{
Intent serviceIntent = new Intent(context, MyLocationService.class);
context.startService(serviceIntent);
Log.v(TAG, "onReceive called");
}
}
ブロードキャストを受信すると、位置情報サービスが開始され、ユーザーの現在位置が取得されます。
サービス クラス:
public class MyLocationService extends Service implements
OnLocationReceivedListener {
private LocationManager manager;
private Location location = null;
PowerManager powerManager;
private WakeLock wakeLock;
private String country;
GPSLocationListener mGPSLocationListener;
NetworkLocationListener mNetworkLocationListener;
private static final int MAX_ATTEMPTS = 250;
private static String TAG = "MyLocationService";
LocTimerTask mTimerTask;
int mSattelites;
Timer myLocTimer;
int count = 0;
boolean isGPS;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.v(TAG, "onStartCommand called");
getCurrentLocation();
return START_STICKY;
}
@Override
public void onCreate() {
Log.v(TAG, "onCreate called");
powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
"mywakelock");
mGPSLocationListener = new GPSLocationListener();
mNetworkLocationListener = new NetworkLocationListener();
wakeLock.acquire();
super.onCreate();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
public void getCurrentLocation() {
manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
manager.addGpsStatusListener(mGPSStatusListener);
mTimerTask = new LocTimerTask(LocationManager.GPS_PROVIDER);
if (manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
Log.v(TAG, "GPS ENABLED");
manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000L,
50.0f, mGPSLocationListener);
}
if(manager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
manager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000L,
50.0f, mNetworkLocationListener);
}
myLocTimer = new Timer("LocationRunner", true);
myLocTimer.schedule(mTimerTask, 0, 500);
}
public class GPSLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location argLocation) {
location = argLocation;
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
public class NetworkLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location argLocation) {
location = argLocation;
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
class LocTimerTask extends TimerTask {
String provider;
public LocTimerTask(String provider) {
this.provider = provider;
}
final Handler mHandler = new Handler(Looper.getMainLooper());
Runnable r = new Runnable() {
@Override
public void run() {
count++;
Log.v(TAG, "Timer Task run" + i);
location = manager.getLastKnownLocation(provider);
if (location != null) {
Log.v(TAG, "in timer task run in if location not null");
onLocationReceived(location);
myLocTimer.cancel();
myLocTimer.purge();
mTimerTask.cancel();
return;
} else {
isGPS = false;
if (location == null && count == MAX_ATTEMPTS) {
turnGPSOff();
location = manager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
onLocationReceived(location);
myLocTimer.cancel();
myLocTimer.purge();
mTimerTask.cancel();
return;
}
} else {
return;
}
}
count = 0;
}
};
public void run() {
mHandler.post(r);
}
}
private GpsStatus.Listener mGPSStatusListener = new GpsStatus.Listener() {
@Override
public synchronized void onGpsStatusChanged(int event) {
switch (event) {
case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
GpsStatus status = manager.getGpsStatus(null);
mSattelites = 0;
Iterable<GpsSatellite> list = status.getSatellites();
for (GpsSatellite satellite : list) {
if (satellite.usedInFix()) {
mSattelites++;
}
}
break;
case GpsStatus.GPS_EVENT_FIRST_FIX:
break;
case GpsStatus.GPS_EVENT_STARTED:
break;
case GpsStatus.GPS_EVENT_STOPPED:
break;
default:
break;
}
}
};
public void onDestroy() {
super.onDestroy();
if (myLocTimer != null) {
myLocTimer.cancel();
myLocTimer.purge(); //Timer not required any more
}
if (mTimerTask != null) {
if (mTimerTask.r != null) {
mTimerTask.mHandler.removeCallbacks(mTimerTask.r);
}
}
if (manager != null) {
if (mGPSLocationListener != null) {
manager.removeUpdates(mGPSLocationListener);
}
//remove location updates for listener once your work is done, otherwise it will drain battery
if (mNetworkLocationListener != null) {
manager.removeUpdates(mNetworkLocationListener);
}
if (mGPSStatusListener != null) {
manager.removeGpsStatusListener(mGPSStatusListener);
}
}
}
@Override
public void onLocationReceived(Location mLoc) {
//Send data to http server once you get location.
}
}
onLocationReceivedここで、私のサービス クラスは、位置情報を取得した後に処理を実行できるコールバック メソッドを持つリスナーを実装します。
public interface OnLocationReceivedListener {
public void onLocationReceived(Location mLoc);
}
マニフェストで、ブロードキャスト レシーバーとサービスをそれぞれ宣言します。
<receiver
android:name=".receiver.StartServiceReceiver"
android:enabled="true"
android:exported="false" >
<intent-filter>
<action android:name="com.example.gpstrackdemo.RECEIVEALARM" />
</intent-filter>
</receiver>
<service android:name=".service.MyLocationService"
android:enabled="true"></service>