RushDroid RushDroid - 4 months ago 36
Android Question

Run App or Method in background in Android even if App Close

I create App which Give me latitude and longitude in every 1 min.i have to update this location information to server in every 1 min.the timer run perfectly. But when I close the app or when i terminate the app from my recent open app than timer doesn't work.

How can I do this in background even if I close app?

GpsTracket.java

public class GPSTracker extends Service implements LocationListener {

private final Context mContext;
private final Handler _handler = new Handler();
private static int DATA_INTERVAL = 1 * 60 * 1000;
public static final long NOTIFY_INTERVAL =1 * 60 * 1000; // 60 seconds

// run on another Thread to avoid crash
private Handler mHandler = new Handler();
// timer handling
private Timer mTimer = null;

// flag for GPS status
boolean isGPSEnabled = false;

// flag for network status
boolean isNetworkEnabled = false;

// flag for GPS status
boolean canGetLocation = false;

Location location; // location
double latitude; // latitude
double longitude; // longitude

// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

// Declaring a Location Manager
protected LocationManager locationManager;
private Handler handler = new Handler();
private long initial_time;
long timeInMilliseconds = 0L;
private Intent intent;
public static final String BROADCAST_ACTION = "com.example.gpstracking.AndroidGPSTrackingActivity";

@Override
public void onCreate() {
super.onCreate();
startService(new Intent(this, AndroidGPSTrackingActivity.class));
initial_time = SystemClock.uptimeMillis();
intent = new Intent(BROADCAST_ACTION);
handler.removeCallbacks(sendUpdatesToUI);
handler.postDelayed(sendUpdatesToUI, 1000);


if(mTimer != null) {
mTimer.cancel();
} else {
// recreate new
mTimer = new Timer();
}
// schedule task
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 0, NOTIFY_INTERVAL);// 1 second

}



private Runnable sendUpdatesToUI = new Runnable() {
public void run() {
getLocation();
handler.postDelayed(this, 1000); // 1 seconds
}
};
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}

public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);

// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);

// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}

} catch (Exception e) {
e.printStackTrace();
}

return location;
}

/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}

/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}

// return latitude
return latitude;
}

/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}

// return longitude
return longitude;
}


/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}

/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

// Setting Dialog Title
alertDialog.setTitle("GPS is settings");

// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});

// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});

// Showing Alert Message
alertDialog.show();
}

@Override
public void onLocationChanged(Location location) {




}
public void notifyUser() {
NotificationManager notificationManager = (NotificationManager)this.getSystemService(Context.NOTIFICATION_SERVICE);

Intent intent = new Intent(GPSTracker.this, AndroidGPSTrackingActivity.class);

//use the flag FLAG_UPDATE_CURRENT to override any notification already there
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

Notification notification = new Notification(R.drawable.ic_launcher, "Some Text", System.currentTimeMillis());
notification.flags = Notification.FLAG_AUTO_CANCEL | Notification.DEFAULT_LIGHTS | Notification.DEFAULT_SOUND;

notification.setLatestEventInfo(this, "", "", contentIntent);
//10 is a random number I chose to act as the id for this notification
notificationManager.notify(10, notification);
}

@Override
public void onDestroy() {
super.onDestroy();
handler.removeCallbacks(sendUpdatesToUI);

}

class TimeDisplayTimerTask extends TimerTask {

@Override
public void run() {
// run on another thread
handler.post(new Runnable() {

@Override
public void run() {
// display toast
Toast.makeText(getApplicationContext(), getDateTime(),
Toast.LENGTH_SHORT).show();
}

});
}

private String getDateTime() {
// get date time in custom format
SimpleDateFormat sdf = new SimpleDateFormat("[yyyy/MM/dd - HH:mm:ss]");
return sdf.format(new Date());
}
}

@Override
public void onProviderDisabled(String provider) {
}

@Override
public void onProviderEnabled(String provider) {
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}

@Override
public IBinder onBind(Intent arg0) {
return null;
}

}


AndroidGPSTrackingActivity.java

public class AndroidGPSTrackingActivity extends Activity {

Button btnShowLocation;

Geocoder geocoder;
List<Address> addresses;
private final Handler _handler = new Handler();
private static int DATA_INTERVAL = 1 * 60 * 1000;
// GPSTracker class
GPSTracker gps;
double longitude;
double latitude;
Calendar c;
SimpleDateFormat sdf;
String strDate;
Intent intent;
private Timer mTimer = null;

protected LocationManager locationManager;
private Handler handler = new Handler();
private long initial_time;
public static final long NOTIFY_INTERVAL = 60 * 1000;
public static final String BROADCAST_ACTION = "com.example.gpstracking.GPSTrackers";
String address,city,state,country,postalCode,knownName,city2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);


geocoder = new Geocoder(this, Locale.getDefault());
initial_time = SystemClock.uptimeMillis();
intent = new Intent(BROADCAST_ACTION);
handler.removeCallbacks(sendUpdatesToUI);
handler.postDelayed(sendUpdatesToUI, 1000 * 70);


if(mTimer != null) {
mTimer.cancel();
} else {
// recreate new
mTimer = new Timer();
}
// schedule task
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 0, NOTIFY_INTERVAL);// 1 second


location();
btnShowLocation = (Button) findViewById(R.id.btnShowLocation);

// show location button click event
btnShowLocation.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
// create class object

location();
}
});
}
class TimeDisplayTimerTask extends TimerTask {

@Override
public void run() {
// run on another thread
handler.post(new Runnable() {

@Override
public void run() {
// display toast
location();
}

});
}
}

public void location(){

gps = new GPSTracker(AndroidGPSTrackingActivity.this);

// check if GPS enabled
if(gps.canGetLocation()){

latitude = gps.getLatitude();
longitude = gps.getLongitude();
try {
addresses = geocoder.getFromLocation(latitude, longitude, 1);
Log.d("adddd", String.valueOf(addresses));
address = addresses.get(0).getAddressLine(0);
city = addresses.get(0).getAddressLine(1);
state = addresses.get(0).getAddressLine(2);
c = Calendar.getInstance();
sdf= new SimpleDateFormat("dd/MM/yyyy hh:mm a ");
strDate = sdf.format(c.getTime());


} catch (IOException e) {
e.printStackTrace();
}
// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude + address + "\n"
+city +" "+ state + "\n" + strDate
, Toast.LENGTH_LONG).show();
_handler.postDelayed(getData, DATA_INTERVAL);
}else{
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}
}
private Runnable sendUpdatesToUI = new Runnable() {
public void run() {

handler.postDelayed(this, 1000 * 60); // 1 seconds
}
};
public void notifyUser() {
NotificationManager notificationManager = (NotificationManager)this.getSystemService(Context.NOTIFICATION_SERVICE);

Intent intent = new Intent(AndroidGPSTrackingActivity.this, AndroidGPSTrackingActivity.class);

//use the flag FLAG_UPDATE_CURRENT to override any notification already there
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

Notification notification = new Notification(R.drawable.ic_launcher, "Some Text", System.currentTimeMillis());
notification.flags = Notification.FLAG_AUTO_CANCEL | Notification.DEFAULT_LIGHTS | Notification.DEFAULT_SOUND;

notification.setLatestEventInfo(this, city, state, contentIntent);
//10 is a random number I chose to act as the id for this notification
notificationManager.notify(10, notification);
}

@Override
public void onStop() {
super.onStop();
_handler.postDelayed(getData, DATA_INTERVAL);
//write your code here to start your service
}
@Override
public void onDestroy() {
startService(new Intent(this, Service.class));
super.onDestroy();

}

@Override
public void onPause() {
super.onPause();
startService(new Intent(this, GPSTracker.class));
location();
//write your code here to start your service
}
private final Runnable getData = new Runnable()
{
@Override
public void run()
{

location();
notifyUser();
}
};
}


Please Help.

Answer

You have to create Background service that extends IntentService which gives latitude and longitude in every 1 min.

You can use Timer or ScheduledExecutorService in your service to get location every 1 min.

You have created your timer in AndroidGPSTrackingActivity class instead of it create new service and move all timer related code to onStartCommand method of background service.

Start your background service in your AndroidGPSTrackingActivity. For automatic restarting of service you have to return START_STICKY in onStartCommand method of your service.

For creating Intent service refer https://developer.android.com/training/run-background-service/create-service.html

I hope it helps!

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