public class LocationService extends Service {
private Handler mHandler = new Handler();
private Timer mTimer = null;
private int mCount = 0;
public static final long NOTIFY_INTERVAL = 10 * 1000;
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
// cancel if already existed
if (mTimer != null) {
mTimer.cancel();
} else {
// recreate new
mTimer = new Timer();
}
// schedule task
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 0, NOTIFY_INTERVAL);
}
#Override
public void onDestroy() {
mTimer.cancel();
}
private class TimeDisplayTimerTask extends TimerTask implements LocationListener {
#Override
public void run() {
mHandler.post(new Runnable() {
#Override
public void run() {
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10 * 1000, 0,
TimeDisplayTimerTask.this);
}
});
}
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
if (location != null) {
Toast.makeText(getApplicationContext(), Double.toString(location.getLat(), Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), Double.toString(location.getLng(), Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "Cant Get Location", Toast.LENGTH_LONG).show();
}
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
}
This code work fine on emulator. I can get location every 10 second. But when I test it on real phone, I don't see anything appear at all. Is it anything wrong with this code? Please show me how to fix this.
Can you verify that your service is not being killed by the device on background?
(You can see this on Settings > Apps > Running tab > [Your app name] There should be a process count and service count there)
Android devices has it's own way if killing services on background. If that's the case, you should start your service on foreground. To prevent it from being killed.
How you ask? You should add this on start of your service:
Notification notification = new Notification();
startForeground(1, notification);
What is the notification you ask? This prompts the user when you're app is on background, you can substitute your toast with this. Here's a link related to its this. Check the accepted answer.
Android - implementing startForeground for a service?
Related
I'm making an app that silences the user's ringer based on their location. I have a Service that runs in the background, and I need it to get the user's location every few seconds. I'm using LocationListener, so I tried putting onLocationChanged inside my service's onStart method, but I was not allowed. So, I'm wondering if I used a Handler to request the user's location every 5 seconds, if it would drain their battery. I'm doing this because I cannot test the app by moving around, so I'm not sure if onLocationChanged gets called.
public class myService extends Service implements LocationListener {
Double lat;
Double lng;
#Override
public IBinder onBind(Intent arg0) {
return null;
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
// Let it continue running until it is stopped.
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
return START_STICKY;
}
#Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();
}
#Override
public void onLocationChanged(Location location) {
if (MainActivity.location != null) {
lat = MainActivity.location.getLatitude();
lng = MainActivity.location.getLongitude();
if (MainActivity.placeArrayList.size() != 0) {
for (int i = 0; i < MainActivity.placeArrayList.size(); i++) {
Log.e("hello", String.valueOf(Float.parseFloat(MainActivity.latitudeArrayList.get(i))));
MainActivity.destination.setLatitude(Double.parseDouble(MainActivity.latitudeArrayList.get(i)));
MainActivity.destination.setLongitude(Double.parseDouble(MainActivity.longitudeArrayList.get(i)));
Log.e("distancemeters", String.valueOf(MainActivity.location.distanceTo(MainActivity.destination)));
if (MainActivity.location.distanceTo(MainActivity.destination)<100) {
AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audioManager.setStreamVolume(AudioManager.STREAM_RING, AudioManager.RINGER_MODE_SILENT, AudioManager.FLAG_SHOW_UI);
} else {
}
}
}
}
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onProviderDisabled(String provider) {
}
}
This is not how you should get user location. Try like this.
If you want to test you function use Android Emulator + Android Device Monitor. There you can set and change user location.
i have to create an android service which needs to get the current G P S coordinates and display a toast through a timer with an interval of every minute. i cant seem to get the coordinates unless i send it manually through the emulator control. i already have a service that runs a timer every minute to display the toast "hello". but i haven't come across any solutions so far.
public static final long NOTIFY_INTERVAL = 60 * 1000; // 60 seconds
// run on another Thread to avoid crash
private Handler mHandler = new Handler();
// timer handling
private Timer mTimer = null;
#Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
#Override
public void onCreate() {
// cancel if already existed
if(mTimer != null) {
mTimer.cancel();
} else {
// recreate new
mTimer = new Timer();
}
// schedule task
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 0, NOTIFY_INTERVAL);
}
class TimeDisplayTimerTask extends TimerTask {
#Override
public void run() {
// run on another thread
mHandler.post(new Runnable() {
#Override
public void run() {
// display toast
Toast.makeText(getApplicationContext(), "hello",
Toast.LENGTH_SHORT).show();
}
});
}
Take a look at this:
http://developer.android.com/training/location/retrieve-current.html
It explains how to get the current location on a device.
I'm trying to write a simple app that updates the MainActivity with the Lat/Lng values returned by the service. But it always returns the null value. I have added permissions and added TheService.java as service in AndroidManifest.xml file...Kindly tell me where I have gone wrong.
MainActivity.java
public class MainActivity extends Activity {
TextView tv1, tv2;
IntentFilter filter;
receive rec;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1 =(TextView)findViewById(R.id.textView1);
tv2 = (TextView)findViewById(R.id.textView2);
filter = new IntentFilter("Updated");
rec = new receive();
Intent gps_int = new Intent(this,TheService.class);
startService(gps_int);
}
#Override
public void onPause()
{
super.onPause();
unregisterReceiver(rec);
}
#Override
public void onResume()
{
super.onResume();
rec = new receive();
registerReceiver(rec, filter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public class receive extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
tv1.setText(intent.getExtras().getString("lat"));
tv2.setText(intent.getExtras().getString("lon"));
Toast.makeText(getApplicationContext(), "Toast Executed", Toast.LENGTH_SHORT).show();
Toast.makeText(getApplicationContext(), "BR Latitude "+intent.getExtras().getString("lat"),Toast.LENGTH_SHORT).show();
}
}}
TheService.java
public class TheService extends Service implements LocationListener {
LocationManager lm;
Location loc;
double lat = 0;
double lon = 0;
#Override
public int onStartCommand(Intent intent, int flags, int startId)
{
lm=(LocationManager)getSystemService(LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, this);
loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
onLocationChanged(loc);
return START_STICKY;
}
#Override
public void onCreate()
{
}
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
updateui(location);
}
private void updateui(Location location) {
// TODO Auto-generated method stub
lat = location.getLatitude();
lon = location.getLongitude();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Intent gps_intent = new Intent("Updated");
gps_intent.putExtra("lat", lat);
gps_intent.putExtra("lon", lon);
sendBroadcast(gps_intent);
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}}
You should use the Google Play Services for the location, that's easier to handle.
What for do you even need a Service? Having a location listener in your Activity is totally fine.
If you want to stay with the Service, than bind the Activity to it, instead of using a Broadcast.
I want to develop location based reminder app. Therefore I want to use android service for get current location even app is not running. But I didn't do. I set timer in android service class but I don't know how to get current location in service class. What is the problem ? I got some error like this:
can't create handler inside thread that has not called looper.prepare()
public class TrackerService extends Service {
double latShared;
double lngShared;
double latService;
double lngService;
private LocationManager lm;
Timer timer;
Handler handler;
final static long TIME = 15000;
SharedPreferences mSharedPrefs;
SharedPreferences.Editor mPrefsEditor;
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
#Override
public void onCreate() {
mSharedPrefs = getSharedPreferences("locationXML", MODE_PRIVATE);
latShared = (double)mSharedPrefs.getFloat("lat", 0);
lngShared = (double)mSharedPrefs.getFloat("lng", 0);
timer = new Timer();
timer.schedule(new TimerTask(){
#Override
public void run(){
LocationUpdates();
}
},0,TIME);
}
public void LocationUpdates(){
locListener locList = new locListener();
lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locList);
}
#Override
public void onDestroy() {
//lm.removeUpdates(this);
timer.cancel();
}
public class locListener implements LocationListener{
#Override
public void onLocationChanged(Location location) {
latService = location.getLatitude();
lngService = location.getLongitude();
}
#Override
public void onProviderDisabled(String provider) {}
#Override
public void onProviderEnabled(String provider) {}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
}
}
LocationManager.requestLocationUpdates is supposed to run on UI thread as its sibling method defines. On the other hand TimerTask introduces a new thread to offload its execution.
However, if you are not using a new process for your service then simply call LocationUpdates() as below:
#Override
protected void onCreate() {
mSharedPrefs = getSharedPreferences("locationXML", MODE_PRIVATE);
latShared = (double)mSharedPrefs.getFloat("lat", 0);
lngShared = (double)mSharedPrefs.getFloat("lng", 0);
final Handler h = new Handler();
h.post(new Runnable() {
#Override
public void run() {
LocationUpdates();
h.postDelayed(this, TIME);
}
});
}
OR, if you don't want to use handler then simply upgrade your requestLocationUpdates as below:
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locList, getMainLooper());
In above case, getMainLooper() will dispatch your location updates from UI thread.
Although I set minTime to 10 seconds in the requestLocatioupdate method I still get new location in less than one second.
public class GpsActivity extends Activity {
LocationManager mLocationManager;
TextView mTextView;
int count;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextView = (TextView) findViewById(R.id.text);
count = 0;
mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 0,mGpsLocationListener);
}
Handler mHandler = new Handler(){
#Override
public void handleMessage(Message msg){
switch(msg.what){
case 1:
mTextView.setText("new location count:"+count);
}
}
};
LocationListener mGpsLocationListener = new LocationListener(){
#Override
public void onLocationChanged(Location location) {
count++;
mHandler.sendEmptyMessage(1);
}
#Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
};
}
My program is written for android 2.2
Any idea?
Thanks in advance.
you can set a distance .if not solve,youcan see :minTime the minimum time interval for notifications, in milliseconds. This field is only used as a hint to conserve power, and actual time between location updates may be greater or lesser than this value.
minDistance the minimum distance interval for notifications, in meters
so i think the time not correct,if you hope update 10s,i think you should use Time andTimeTask,or handler. or you can look http://androidforums.com/developer-101/107085-proper-provider-parameter-requestlocationupdates.html