I have a main activity which shows google map (v2). Periodically I send data and retrieve data using Alarm manager of Android. Once I receive the data from Alarm manager, I need to pass the retrieved location details back to the Google map. How could I do it? Let me know if you require code to understand this.
MapViewActivity.java
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.gson.Gson;
public class MapViewActivity extends Activity implements LocationListener,
SensorEventListener, OnClickListener {
GoogleMap googleMap;
private boolean started = false;
private ArrayList<AccelLocData> sensorData;
private SensorManager sensorManager;
private Button btnStart, btnStop;
private String provider;
// File root, dir, sensorFile;
FileOutputStream fOut;
private Sensor mAccelerometer;
private FileWriter writer;
private DatabaseHelper databaseHelper;
private BroadcastReceiver alarmReceiver;
private PendingIntent pendingIntentSender, pendingIntentReceiver;
private AlarmManager alarmManager;
private Intent alarmIntent,alarmIntent2;
// private Button btnUpload;
@SuppressLint("NewApi")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
databaseHelper = new DatabaseHelper(this);
databaseHelper.removeAll();
Log.v("datacount",
Integer.toString(databaseHelper.getLocDataCount()));
sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mAccelerometer = sensorManager
.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
btnStart = (Button) findViewById(R.id.btnStart);
btnStop = (Button) findViewById(R.id.btnStop);
btnStart.setOnClickListener(this);
btnStop.setOnClickListener(this);
btnStart.setEnabled(true);
btnStop.setEnabled(false);
alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
int status = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(getBaseContext());
if (status != ConnectionResult.SUCCESS) { // Google Play Services
// are
// not available
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status,
this, requestCode);
dialog.show();
} else { // Google Play Services are available
// Getting reference to the SupportMapFragment of
// activity_main.xml
// SupportMapFragment supportMapFragment = (MapFragment)
// getFragmentManager().findFragmentById(R.id.map);
// Getting GoogleMap object from the fragment
googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
// can use for overlay on the map
List<Double> latList = new ArrayList<Double>();
latList.add(145.7309593);
latList.add(146.34);
latList.add(147.34);
List<Double> lonList = new ArrayList<Double>();
lonList.add(-122.6365384);
lonList.add(-123.6365384);
lonList.add(-124.6365384);
for (int i = 0; i < 3; i++) {
// LatLng latLng = new LatLng(45.7309593, -122.6365384);
LatLng latLng = new LatLng(latList.get(i).doubleValue(),
lonList.get(i).doubleValue());
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
googleMap
.addMarker(new MarkerOptions()
.position(latLng)
.title("My Spot")
.snippet("This is my spot!")
.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
}
// Enabling MyLocation Layer of Google Map
googleMap.setMyLocationEnabled(true);
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager
.getLastKnownLocation(provider);
if (location != null) {
onLocationChanged(location);
}
locationManager
.requestLocationUpdates(provider, 20000, 0, this);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void onSensorChanged(SensorEvent event) {
if (started) {
double x = event.values[0];
double y = event.values[1];
double z = event.values[2];
long timestamp = System.currentTimeMillis();
LocationManager locManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setPowerRequirement(Criteria.POWER_MEDIUM);
criteria.setAccuracy(Criteria.ACCURACY_FINE);
provider = locManager.getBestProvider(criteria, true);
Location location = locManager.getLastKnownLocation(provider);
double latitude = 0;
double longitude = 0;
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
AccelLocData accelLocData = new AccelLocData(timestamp, x, y, z,
latitude, longitude);
// Log.d("X data","data x:" + data.getX());
try {
// writer.write(data.toString());
if (databaseHelper != null)
databaseHelper.insertLocData(accelLocData);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void onLocationChanged(Location location) {
TextView tvLocation = (TextView) findViewById(R.id.tv_location);
// Getting latitude of the current location
double latitude = location.getLatitude();
// Getting longitude of the current location
double longitude = location.getLongitude();
// Creating a LatLng object for the current location
LatLng latLng = new LatLng(latitude, longitude);
// Showing the current location in Google Map
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
// Zoom in the Google Map
googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnStart:
Context context = getApplicationContext();
alarmIntent = new Intent(context, AccelLocSender.class);
AlarmManager alarmManager = (AlarmManager) context
.getSystemService(Context.ALARM_SERVICE);
pendingIntentSender = PendingIntent.getBroadcast(context, 0,
alarmIntent, 0);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis(), 60000, pendingIntentSender);
alarmIntent2 = new Intent(context, AccelLocReceiver.class);
pendingIntentReceiver = PendingIntent.getBroadcast(context, 0,
alarmIntent2, 0);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis(), 30000, pendingIntentReceiver);
btnStart.setEnabled(false);
btnStop.setEnabled(true);
Log.d("startbutton", "cam on click of start");
started = true;
// delete all files..
// start thread to send data
sensorManager.registerListener(this, mAccelerometer,
SensorManager.SENSOR_DELAY_FASTEST);
break;
case R.id.btnStop:
try {
btnStart.setEnabled(true);
btnStop.setEnabled(false);
// btnUpload.setEnabled(true);
started = false;
sensorManager.unregisterListener(this);
Context context1 = getApplicationContext();
AlarmManager alarmManager1 = (AlarmManager) context1
.getSystemService(Context.ALARM_SERVICE);
alarmManager1.cancel(pendingIntentSender);
alarmManager1.cancel(pendingIntentReceiver);
// System.exit(0);
} catch (Exception e) {
e.printStackTrace();
}
break;
default:
break;
}
}
protected void onPause() {
super.onPause();
/*
* if (writer != null) { try { writer.close(); } catch (IOException e) {
* // TODO Auto-generated catch block e.printStackTrace(); } }
*/
}
protected void onResume() {
super.onResume();
/*
* try { Log.d("onresume","called onresume"); writer = new
* FileWriter(sensorFile, true); } catch (IOException e) { // TODO
* Auto-generated catch block e.printStackTrace(); }
*/
}
@Override
public void onProviderDisabled(String arg0) {
// 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
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
}
AccelLocReceiver.java
public class AccelLocReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context arg0, Intent arg1) {
System.out.println("cmg in AccelLocReceiver");
Log.i("Alarm receiver", "Came in alarm receiver");
receiveDataFromServer();
}
private void receiveDataFromServer() {
try {
// I get this successfully location details here. I use httpclient to send data to php webserver.
} catch (Exception e) {
e.printStackTrace();
}
}
}
Similarly AccelLocSender class to send the data.
You have quite a bit messed up application architecture.
Activity. Application subclass is a good place for that.BroadcastReceiver.onReceive. Start a Service there or simply call a function in Application, that will run a Thread if you are not afraid of app being killed when in background.Activity as a listener. When you get a callback, use your googleMap object to create any objects you want.