Develop Reference

Load Map Activity Faster In Android App

I have a map activity which loads too slow and I want to have a faster map activity. How can I achieve this? I heard pre-loading the map is effective but I am not sure how to do this. I am not going to post my whole map activity because it is a little confusing but I will post a base sample(from Github) which I used the same way to load the map.
import android.app.ProgressDialog;
import android.graphics.Color;
import android.location.Location;
import android.net.Uri;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;
import com.google.maps.android.SphericalUtil;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class MapsActivity extends FragmentActivity implements
OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
GoogleMap.OnMarkerDragListener,
GoogleMap.OnMapLongClickListener,
View.OnClickListener{
//Our Map
private GoogleMap mMap;
//To store longitude and latitude from map
private double longitude;
private double latitude;
//From -> the first coordinate from where we need to calculate the distance
private double fromLongitude;
private double fromLatitude;
//To -> the second coordinate to where we need to calculate the distance
private double toLongitude;
private double toLatitude;
//Google ApiClient
private GoogleApiClient googleApiClient;
//Our buttons
private Button buttonSetTo;
private Button buttonSetFrom;
private Button buttonCalcDistance;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
//Initializing googleapi client
// ATTENTION: This "addApi(AppIndex.API)"was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.addApi(AppIndex.API).build();
buttonSetTo = (Button) findViewById(R.id.buttonSetTo);
buttonSetFrom = (Button) findViewById(R.id.buttonSetFrom);
buttonCalcDistance = (Button) findViewById(R.id.buttonCalcDistance);
buttonSetTo.setOnClickListener(this);
buttonSetFrom.setOnClickListener(this);
buttonCalcDistance.setOnClickListener(this);
}
#Override
protected void onStart() {
googleApiClient.connect();
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"Maps Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app deep link URI is correct.
Uri.parse("android-app://net.simplifiedcoding.googlemapsdistancecalc/http/host/path")
);
AppIndex.AppIndexApi.start(googleApiClient, viewAction);
}
#Override
protected void onStop() {
googleApiClient.disconnect();
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"Maps Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app deep link URI is correct.
Uri.parse("android-app://net.simplifiedcoding.googlemapsdistancecalc/http/host/path")
);
AppIndex.AppIndexApi.end(googleApiClient, viewAction);
}
//Getting current location
private void getCurrentLocation() {
mMap.clear();
//Creating a location object
Location location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
if (location != null) {
//Getting longitude and latitude
longitude = location.getLongitude();
latitude = location.getLatitude();
//moving the map to location
moveMap();
}
}
//Function to move the map
private void moveMap() {
//Creating a LatLng Object to store Coordinates
LatLng latLng = new LatLng(latitude, longitude);
//Adding marker to map
mMap.addMarker(new MarkerOptions()
.position(latLng) //setting position
.draggable(true) //Making the marker draggable
.title("Current Location")); //Adding a title
//Moving the camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
//Animating the camera
mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
}
public String makeURL (double sourcelat, double sourcelog, double destlat, double destlog ){
StringBuilder urlString = new StringBuilder();
urlString.append("https://maps.googleapis.com/maps/api/directions/json");
urlString.append("?origin=");// from
urlString.append(Double.toString(sourcelat));
urlString.append(",");
urlString
.append(Double.toString( sourcelog));
urlString.append("&destination=");// to
urlString
.append(Double.toString( destlat));
urlString.append(",");
urlString.append(Double.toString(destlog));
urlString.append("&sensor=false&mode=driving&alternatives=true");
urlString.append("&key=AIzaSyCJVpM7-ayGMraxFRzq4U8Dt1uRNsmiaws");
return urlString.toString();
}
private void getDirection(){
//Getting the URL
String url = makeURL(fromLatitude, fromLongitude, toLatitude, toLongitude);
//Showing a dialog till we get the route
final ProgressDialog loading = ProgressDialog.show(this, "Getting Route", "Please wait...", false, false);
//Creating a string request
StringRequest stringRequest = new StringRequest(url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
loading.dismiss();
//Calling the method drawPath to draw the path
drawPath(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
loading.dismiss();
}
});
//Adding the request to request queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
//The parameter is the server response
public void drawPath(String result) {
//Getting both the coordinates
LatLng from = new LatLng(fromLatitude,fromLongitude);
LatLng to = new LatLng(toLatitude,toLongitude);
//Calculating the distance in meters
Double distance = SphericalUtil.computeDistanceBetween(from, to);
//Displaying the distance
Toast.makeText(this,String.valueOf(distance+" Meters"),Toast.LENGTH_SHORT).show();
try {
//Parsing json
final JSONObject json = new JSONObject(result);
JSONArray routeArray = json.getJSONArray("routes");
JSONObject routes = routeArray.getJSONObject(0);
JSONObject overviewPolylines = routes.getJSONObject("overview_polyline");
String encodedString = overviewPolylines.getString("points");
List<LatLng> list = decodePoly(encodedString);
Polyline line = mMap.addPolyline(new PolylineOptions()
.addAll(list)
.width(20)
.color(Color.RED)
.geodesic(true)
);
}
catch (JSONException e) {
}
}
private List<LatLng> decodePoly(String encoded) {
List<LatLng> poly = new ArrayList<LatLng>();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
while (index < len) {
int b, shift = 0, result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
LatLng p = new LatLng( (((double) lat / 1E5)),
(((double) lng / 1E5) ));
poly.add(p);
}
return poly;
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng latLng = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(latLng).draggable(true));
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.setOnMarkerDragListener(this);
mMap.setOnMapLongClickListener(this);
}
#Override
public void onConnected(Bundle bundle) {
getCurrentLocation();
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
#Override
public void onMapLongClick(LatLng latLng) {
//Clearing all the markers
mMap.clear();
//Adding a new marker to the current pressed position
mMap.addMarker(new MarkerOptions()
.position(latLng)
.draggable(true));
latitude = latLng.latitude;
longitude = latLng.longitude;
}
#Override
public void onMarkerDragStart(Marker marker) {
}
#Override
public void onMarkerDrag(Marker marker) {
}
#Override
public void onMarkerDragEnd(Marker marker) {
//Getting the coordinates
latitude = marker.getPosition().latitude;
longitude = marker.getPosition().longitude;
//Moving the map
moveMap();
}
#Override
public void onClick(View v) {
if(v == buttonSetFrom){
fromLatitude = latitude;
fromLongitude = longitude;
Toast.makeText(this,"From set",Toast.LENGTH_SHORT).show();
}
if(v == buttonSetTo){
toLatitude = latitude;
toLongitude = longitude;
Toast.makeText(this,"To set",Toast.LENGTH_SHORT).show();
}
if(v == buttonCalcDistance){
getDirection();
}
}
}
Thank you in advance.

Use hardware acceleration.
For entire application put this in manifest file:
<application android:hardwareAccelerated="true">
Disable acceleration for some activities where you don't want to:
<application android:hardwareAccelerated="true">
<activity ... />
<activity android:hardwareAccelerated="false" />
</application>

I found an answer to my question but I know it is not the best answer because of that I won't mark it as the true answer in order to make a motivation for others to find better answers. I added the following code in onMapReady:
googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
I changed the map type from normal to terrain and this solution caused the map to load faster.

location api does not give exact current location sometime in android using google fused api

I have used the following code to get the current location and path the route in google map. The problem i faced is that the current device location is not stable all the time. It shows correct location sometime but shows different location like 1km away from actual location.
package com.colors.organisatiom.activity.colors;
import android.Manifest;
import android.annotation.TargetApi;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.location.Location;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.Toast;
import com.colors.organisatiom.activity.colors.classes.ConnectionManager;
import com.colors.organisatiom.activity.colors.interfaces.PolyLineCallback;
import com.colors.organisatiom.activity.colors.json.GetDistanceFromServer;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;
import java.util.ArrayList;
import java.util.List;
public class LocationMap extends AppCompatActivity implements LocationListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private GoogleMap map;
private String serviceCentreLongitude, serviceCentreLatitude, serviceCenhterLocation;
final private int REQUEST_CODE_ASK_PERMISSIONS = 123;
private RelativeLayout connectingParent;
private PolylineOptions polylineOptions;
private Polyline polyline;
private List<Polyline> polylines = new ArrayList<>();
private GoogleApiClient googleApiClient;
private LocationRequest locationRequest;
private static final long INTERVAL = 1 * 5;
private static final long FASTEST_INTERVAL = 10;
protected BroadcastReceiver mNotificationReceiver;
private Marker currentLocationMarker;
protected void createLocationRequest() {
locationRequest = new LocationRequest();
locationRequest.setInterval(INTERVAL);
locationRequest.setFastestInterval(FASTEST_INTERVAL);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
serviceCentreLatitude = getIntent().getStringExtra("latitude");
serviceCentreLongitude = getIntent().getStringExtra("longitude");
serviceCenhterLocation = getIntent().getStringExtra("service_center_location");
setContentView(R.layout.content_google_map);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Window window = this.getWindow();
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
window.setStatusBarColor(ContextCompat.getColor(this, R.color.colorPrimaryDark));
}
mNotificationReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
if (!LocationMap.this.isFinishing()) {
AlertDialog.Builder builder = new AlertDialog.Builder(LocationMap.this);
builder.setTitle(intent.getStringExtra("title"));
builder.setMessage(intent.getStringExtra("message"));
builder.setPositiveButton("Dismiss", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
//alertDialog.dismiss();
}
});
final AlertDialog alertDialog = builder.create();
alertDialog.show();
}
}
};
if (!isGooglePlayServicesAvailable()) {
Toast.makeText(this, "Google play service not supported", Toast.LENGTH_LONG).show();
}
createLocationRequest();
googleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
connectingParent = (RelativeLayout) findViewById(R.id.connecting_parent);
if (!new ConnectionManager(this).isConnectionToInternet()) {
connectingParent.setVisibility(View.GONE);
Toast.makeText(LocationMap.this, "No internet connection to route path", Toast.LENGTH_LONG).show();
}
ImageView search = (ImageView) findViewById(R.id.search);
search.setVisibility(View.INVISIBLE);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
int hasAccessCoarseLocationPermission = checkSelfPermission(android.Manifest.permission.ACCESS_COARSE_LOCATION);
int hasAccessFineLocationPermission = checkSelfPermission(android.Manifest.permission.ACCESS_FINE_LOCATION);
if (hasAccessCoarseLocationPermission != PackageManager.PERMISSION_GRANTED && hasAccessFineLocationPermission != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION},
REQUEST_CODE_ASK_PERMISSIONS);
} else {
showMapWithLocation();
if (googleApiClient.isConnected()) {
startLocationUpdates();
}
}
} else {
showMapWithLocation();
if (googleApiClient.isConnected()) {
startLocationUpdates();
}
}
}
#Override
public void onStart() {
super.onStart();
Log.d("Started:", "onStart fired ..............");
googleApiClient.connect();
}
#Override
public void onStop() {
super.onStop();
Log.d("Stopped", "onStop fired ..............");
googleApiClient.disconnect();
Log.d("Is connected status", "isConnected ...............: " + googleApiClient.isConnected());
}
private void showMapWithLocation() {
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
LatLng latLng = new LatLng(Double.parseDouble(serviceCentreLatitude), Double.parseDouble(serviceCentreLongitude));
map.addMarker(new MarkerOptions()
.position(latLng)
.title(serviceCenhterLocation)).showInfoWindow();
map.getUiSettings().setMapToolbarEnabled(false);
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 14);
map.animateCamera(cameraUpdate);
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions,
#NonNull int[] grantResults) {
switch (requestCode) {
case REQUEST_CODE_ASK_PERMISSIONS:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
startLocationUpdates();
if (googleApiClient.isConnected()) {
startLocationUpdates();
}
} else {
Toast.makeText(LocationMap.this, "Cannot show map", Toast.LENGTH_SHORT)
.show();
}
break;
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
private List<LatLng> decodePoly(String encoded) {
List<LatLng> poly = new ArrayList<>();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
while (index < len) {
int b, shift = 0, result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
LatLng p = new LatLng((((double) lat / 1E5)),
(((double) lng / 1E5)));
poly.add(p);
}
return poly;
}
#Override
public void onConnected(Bundle bundle) {
Log.e("Connection status:", "onConnected - isConnected ...............: " + googleApiClient.isConnected());
startLocationUpdates();
}
protected void startLocationUpdates() {
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);
Log.e("Update started:", "Location update started ..............: ");
}
#Override
public void onLocationChanged(Location location) {
final double myLocationlatitude = location.getLatitude();
final double myLocationlongitude = location.getLongitude();
Log.e("Latitude", String.valueOf(myLocationlatitude));
Log.e("Longitude", String.valueOf(myLocationlongitude));
LatLng latLng = new LatLng(myLocationlatitude, myLocationlongitude);
//drawing the path in google map
//zoom the camera for the first time
if (currentLocationMarker != null) {
currentLocationMarker.remove();
}
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("My current location");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE));
currentLocationMarker = map.addMarker(markerOptions);
if (polylines == null) {
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 14);
map.animateCamera(cameraUpdate);
}
new AsyncTask<Void, Void, Void>() {
#Override
protected Void doInBackground(Void... params) {
new GetDistanceFromServer(String.valueOf(myLocationlatitude), String.valueOf(myLocationlongitude), serviceCentreLatitude, serviceCentreLongitude).drawPath(new PolyLineCallback() {
#Override
public void polyLinePointsHolder(String points) {
//remove the path and draw the path in google map while updating
if (polylines != null) {
for (Polyline line : polylines) {
line.remove();
}
}
List<LatLng> list = decodePoly(points);
polylineOptions = new PolylineOptions()
.addAll(list)
.width(12)
.color(Color.parseColor("#05b1fb"))
.geodesic(true);
polyline = map.addPolyline(polylineOptions);
polylines.add(polyline);
}
});
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
connectingParent.setVisibility(View.GONE);
super.onPostExecute(aVoid);
}
}.execute();
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.e("Connection Failed", connectionResult.getErrorMessage());
}
#Override
protected void onPause() {
super.onPause();
stopLocationUpdates();
}
protected void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(
googleApiClient, this);
Log.d("TAG", "Location update stopped .......................");
}
private boolean isGooglePlayServicesAvailable() {
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (ConnectionResult.SUCCESS == status) {
return true;
} else {
GooglePlayServicesUtil.getErrorDialog(status, this, 0).show();
return false;
}
}
#Override
public void onResume() {
super.onResume();
LocalBroadcastManager.getInstance(this).registerReceiver(mNotificationReceiver, new IntentFilter("1000"));
if (googleApiClient.isConnected()) {
startLocationUpdates();
Log.d("TAG", "Location update resumed .....................");
}
}
}

The accuracy of location can be affected due to many factors including GPS coverage, device quality and wifi availability around the area. What you can do is to check the accuracy of the location you obtained and decide whether to proceed or not. For this you can use hasAccuracy() and getAccuracy() methods of the Location object.
Here is a quote from the documentation about getAccuracy method
Get the estimated accuracy of this location, in meters.
We define accuracy as the radius of 68% confidence. In other words, if
you draw a circle centered at this location's latitude and longitude,
and with a radius equal to the accuracy, then there is a 68%
probability that the true location is inside the circle.
In statistical terms, it is assumed that location errors are random
with a normal distribution, so the 68% confidence circle represents
one standard deviation. Note that in practice, location errors do not
always follow such a simple distribution.
This accuracy estimation is only concerned with horizontal accuracy,
and does not indicate the accuracy of bearing, velocity or altitude if
those are included in this Location.
If this location does not have an accuracy, then 0.0 is returned. All
locations generated by the LocationManager include an accuracy.
In your onLocationChanged method, you can do the following
#Override
public void onLocationChanged(Location location) {
if(location.hasAccuracy() && location.getAccuracy() < 100F) {
// the location has accuracy and has an accuracy span within 100m radius
// do whatever you want with this location and stop location listener
stopLocationUpdates();
}
// if the above code did not get executed, the location listener will work
// until a location with acceptable accuracy is obtained
}

The method fromPixels(int, int) is undefined for the type Projection & The method getLatitudeE6() is undefined for the type GeoPoint

It is not working on fromPixels() & on getLatitudeE6() *getLongitudeE6()* at
public boolean onTouchEvent(MotionEvent event, MapView mapView)
method,which is situated at the last portion of this code.Can any one help plz.....
package com.mamun.tasktest;
import java.io.IOException;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient;
import com.google.android.gms.location.LocationClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapActivity<GeoPoint, OverlayItem> extends Activity implements
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener, LocationListener {
private LocationManager manager;
private TextView tvAddress;
private Button btnSearch;
private EditText etSearch;
private LocationClient locationClient;
private GoogleMap googleMap;
private MapFragment mapFragment;
//private GeoPoint p;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
manager = (LocationManager) getSystemService(LOCATION_SERVICE);
tvAddress = (TextView) findViewById(R.id.tvaddress);
btnSearch = (Button) findViewById(R.id.btnSearch);
etSearch = (EditText) findViewById(R.id.etSearch);
mapFragment = (MapFragment) getFragmentManager().findFragmentById(
R.id.maps);
googleMap = mapFragment.getMap();
locationClient = new LocationClient(this, this, this);
}
public void onSearch(View v) {
// Getting user input location
String location = etSearch.getText().toString();
if (location != null && !location.equals("")) {
new GeocoderTask().execute(location);
}
}
#Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
locationClient.connect();
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
locationClient.disconnect();
}
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
}
#Override
public void onConnectionFailed(ConnectionResult result) {
}
#Override
public void onConnected(Bundle connectionHint) {
try {
Location currentLocation = locationClient.getLastLocation();
double lat = currentLocation.getLatitude();
double lng = currentLocation.getLongitude();
// txtLocation.setText(lat + ", " + lng);
Geocoder geocoder = new Geocoder(this);
ArrayList<Address> address = (ArrayList<Address>) geocoder
.getFromLocation(currentLocation.getLatitude(),
currentLocation.getLongitude(), 5);
Address addr = address.get(0);
String currentAddress = (addr.getAddressLine(0) + "-"
+ addr.getAdminArea() + "-" + addr.getLocality() + "-"
+ addr.getPostalCode() + "-" + addr.getCountryCode());
MarkerOptions options = new MarkerOptions();
options.position(new LatLng(lat, lng));
options.title(currentAddress);
options.snippet("Current location");
options.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_AZURE));
if (googleMap != null) {
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(lat, lng), 14.0f));
googleMap.addMarker(options);
} else {
Toast.makeText(getApplicationContext(), "Map is null",
Toast.LENGTH_LONG).show();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
public void onDisconnected() {
// TODO Auto-generated method stub
}
// An AsyncTask class for accessing the GeoCoding Web Service
private class GeocoderTask extends
AsyncTask<String, Void, ArrayList<Address>> {
#Override
protected ArrayList<Address> doInBackground(String... locationName) {
// Creating an instance of Geocoder class
Geocoder geocoder = new Geocoder(getBaseContext());
ArrayList<Address> addresses = null;
try {
// Getting a maximum of 3 Address that matches the input text
addresses = (ArrayList<Address>) geocoder.getFromLocationName(
locationName[0], 3);
} catch (IOException e) {
e.printStackTrace();
}
return addresses;
}
#Override
protected void onPostExecute(ArrayList<Address> addresses) {
if (addresses == null || addresses.size() == 0) {
Toast.makeText(getBaseContext(), "No Location found",
Toast.LENGTH_SHORT).show();
return;
}
// Clears all the existing markers on the map
googleMap.clear();
// Adding Markers on Google Map for each matching address
for (int i = 0; i < addresses.size(); i++) {
Address address = (Address) addresses.get(i);
// Creating an instance of GeoPoint, to display in Google Map
LatLng latLng;
latLng = new LatLng(address.getLatitude(),
address.getLongitude());
String addressText = String.format(
"%s, %s",
address.getMaxAddressLineIndex() > 0 ? address
.getAddressLine(0) : "", address
.getCountryName());
MarkerOptions markerOptions = new MarkerOptions();
// markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title(addressText);
googleMap.addMarker(markerOptions);
// Locate the first location
if (i == 0)
googleMap.animateCamera(CameraUpdateFactory
.newLatLng(latLng));
}
}
}
public class AddItemizedOverlay extends ItemizedOverlay<OverlayItem> {
/*................. Add this method ........*/
public boolean onTouchEvent(MotionEvent event, MapView mapView)
{
if (event.getAction() == 1) {
GeoPoint geopoint = googleMap.getProjection().fromPixels(
(int) event.getX(),
(int) event.getY());
// latitude
double lat = (geopoint).getLatitudeE6() / 1E6;
// longitude
double lon = (geopoint).getLongitudeE6() / 1E6;
Toast.makeText(getBaseContext(), "Lat: " + lat + ", Lon: "+lon, Toast.LENGTH_SHORT).show();
}
return false;
}
}
}

Google Maps compatibility with different Android versions/devices

I've developed an Android application that uses Google Maps API v2 to display a map that show the user location, different other points (shops...), a tracking blue point that represents the user when he moves and direction to a specific location.
All of this is correctly working on some devices, but not on others, and I don't know why?
Works well with Android 4.2.2, 4.3, 2.3.7
But not with Android 2.3.6, 4.0.1 for example.
Is it something related to Google Play Services that maybe is not installed on the other devices?
Is there something wrong with my code?
Here's my code:
package com.app.connexion;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;
import org.w3c.dom.Document;
import com.datatype.AppData;
import com.datatype.OrderInfo;
import com.datatype.ShopInfo;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMyLocationChangeListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.UiSettings;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.PolylineOptions;
import com.utils.GMapV2Direction;
import com.utils.RequestTask;
import com.utils.RequestTask1;
import com.utils.RequestTaskDelegate;
import com.utils.WebServiceMethod;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
public class DetailOrder extends FragmentActivity implements RequestTaskDelegate{
/** Called when the activity is first created. */
String request;
String basket;
ImageButton checkout;
ProgressDialog prog;
GoogleMap mMap;
GMapV2Direction md;
String toaddr = "";
LatLng fromPosition = new LatLng(13.687140112679154, 100.53525868803263);
LatLng toPosition = new LatLng(13.683660045847258, 100.53900808095932);
String orderid,gps;
PolylineOptions rectLine;
ArrayList<ShopInfo> shops;
ImageButton posbtn;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// TODO Auto-generated method stub
setContentView(R.layout.detailorderone);
checkout = (ImageButton)findViewById(R.id.imageButton1);
orderid = getIntent().getStringExtra("orderid");
gps = getIntent().getStringExtra("others");
posbtn = (ImageButton)findViewById(R.id.imageButton2);
posbtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
mMap.clear();
sendGPS();
positionredraw();
}
});
checkout.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(v.getContext(),DetailProductVC.class);
intent.putExtra("basket", basket);
intent.putExtra("orderid", orderid);
startActivity(intent);
}
});
prog = ProgressDialog.show(this, "", "Processing...",true,false);
RequestTask task = new RequestTask();
task.delegate = this;
request = WebServiceMethod.kCommandeInfosMethode;
task.execute(request,orderid);
getCurrentPosition();
}
public void positionredraw()
{
//prog = ProgressDialog.show(this, "", "Processing...",true,false);
viewmap1();
}
public void getCurrentPosition()
{
mMap = ((SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
mMap.setMyLocationEnabled(true);
UiSettings ui = mMap.getUiSettings();
ui.setMyLocationButtonEnabled(false);
mMap.getMyLocation();
// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
fromPosition = new LatLng(location.getLatitude(),location.getLongitude());
/*
mMap.clear();
sendGPS();
positionredraw();
*/
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria, true);
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(provider, 1000, 1, locationListener);
Location location = locationManager.getLastKnownLocation(provider);
if (location != null) {
String message = String.format("Current Location \n Longitude: %1$s \n Latitude: %2$s",location.getLongitude(), location.getLatitude());
fromPosition = new LatLng(location.getLatitude(),location.getLongitude());
//fromPosition = new LatLng(48.8966175,2.327197);
Log.d("current",message);
}
}
public void sendGPS()
{
Thread t;
t = new Thread(new Runnable()
{
#Override
public void run() {
// TODO Auto-generated method stub
try{
sendGPSData();
}catch(Exception e)
{
}
}
});
t.start();
}
public void sendGPSData()
{
SharedPreferences shared = getSharedPreferences("connexion",MODE_PRIVATE);
String shopperid = shared.getString("shopperid", "");
HttpClient client = new DefaultHttpClient();
HttpPost post;
post = new HttpPost(WebServiceMethod.serverurl);
Log.d("gps", "send gps");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(5);
nameValuePairs.add(new BasicNameValuePair("key", WebServiceMethod.key));
nameValuePairs.add(new BasicNameValuePair("secret", WebServiceMethod.secret));
nameValuePairs.add(new BasicNameValuePair("shopperid", shopperid));
nameValuePairs.add(new BasicNameValuePair("latitude", String.valueOf(fromPosition.latitude)));
nameValuePairs.add(new BasicNameValuePair("longitude", String.valueOf(fromPosition.longitude)));
nameValuePairs.add(new BasicNameValuePair("act", WebServiceMethod.kUpdateShopperStatusMethode));
try{
post.setEntity(new UrlEncodedFormEntity(nameValuePairs,"UTF-8"));
post.setHeader("Content-type", "application/x-www-form-urlencoded; charset=UTF-8");
HttpResponse response = client.execute(post);
//response = client.execute(post);
HttpEntity resEntity = response.getEntity();
String str = EntityUtils.toString(resEntity);
Log.d("gpsResult",str);
}catch(Exception e)
{
}
}
public void viewmap1()
{
LatLng from,to;
//prog.dismiss();
rectLine = new PolylineOptions().width(10).color(Color.BLUE);
mMap.addMarker(new MarkerOptions().position(fromPosition).title("Moi"));
//mMap.addMarker(new MarkerOptions().position(toPosition).title("B"));
String[] gpss = gps.split("#");
from = fromPosition;
to = null;
for(int i = 0; i < gpss.length - 1;i++)
{
to = new LatLng(Double.parseDouble(gpss[i].split(",")[0]),Double.parseDouble(gpss[i].split(",")[1]));
viewmap(from,to);
from = to;
}
int len = gpss.length - 1;
viewmap(from,new LatLng(Double.parseDouble(gpss[len].split(",")[0]),Double.parseDouble(gpss[len].split(",")[1])));
ArrayList<OrderInfo> orders = ((AppData)this.getApplication()).orders;
for(int i = 0; i < gpss.length;i++)
{
OrderInfo order = orders.get(i);
to = new LatLng(Double.parseDouble(gpss[i].split(",")[0]),Double.parseDouble(gpss[i].split(",")[1]));
mMap.addMarker(new MarkerOptions().position(to).title(order.name));
}
LatLng coordinates = new LatLng((fromPosition.latitude + to.latitude)/2, (fromPosition.longitude + to.longitude)/2);
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinates, 13));
mMap.addPolyline(rectLine);
try{
for(int i = 0;i < shops.size();i++)
{
mMap.addMarker(new MarkerOptions().position(shops.get(i).pos).title(shops.get(i).name));
}
}catch(Exception e)
{
}
}
public void viewmap(LatLng from,LatLng to)
{
SharedPreferences shared = getSharedPreferences("connexion",MODE_PRIVATE);
String type = shared.getString("type", "");
md = new GMapV2Direction(type);
//LatLng coordinates = new LatLng(13.685400079263206, 100.537133384495975);
Document doc;
if(type.equals("0"))
doc = md.getDocument(from, to, GMapV2Direction.MODE_WALKING);
else
doc = md.getDocument(from, to, GMapV2Direction.MODE_DRIVING);
/*
int duration = md.getDurationValue(doc);
String distance = md.getDistanceText(doc);
String start_address = md.getStartAddress(doc);
String copy_right = md.getCopyRights(doc);
*/
ArrayList<LatLng> directionPoint = md.getDirection(doc);
for(int i = 0 ; i < directionPoint.size() ; i++) {
rectLine.add(directionPoint.get(i));
}
}
#Override
public void backgroundActivityComp(String response) {
// TODO Auto-generated method stub
if(request.equals(WebServiceMethod.kCommandeInfosMethode))
{
try {
JSONObject json = new JSONObject(response);
String str = json.getString("Results");
if(!str.equals("false"))
{
json = new JSONObject(str);
JSONObject gps = new JSONObject(json.getString("addr"));
JSONObject gps1 = new JSONObject(gps.getString("gps"));
toPosition = new LatLng(Double.parseDouble(gps1.getString("latitude")),Double.parseDouble(gps1.getString("longitude")));
toaddr = gps.getString("name");
basket = json.getString("basket");
SharedPreferences shared = getSharedPreferences("connexion",MODE_PRIVATE);
RequestTask task = new RequestTask();
task.delegate = this;
request = WebServiceMethod.kShipInfosMethode;
task.execute(request,shared.getString("shipid", ""));
return;
}
}catch(Exception e)
{
e.printStackTrace();
prog.dismiss();
}
return;
}
if(request.equals(WebServiceMethod.kShipInfosMethode))
{
try{
prog.dismiss();
JSONObject json = new JSONObject(response);
shops = new ArrayList<ShopInfo>();
if(!json.getString("Results").equals("false"))
{
json = new JSONObject(json.getString("Results"));
//shops = new ArrayList<ShopInfo>();
JSONArray jsons = new JSONArray(json.getString("shops"));
for(int i = 0; i < jsons.length();i++)
{
ShopInfo shop = new ShopInfo();
json = new JSONObject(jsons.get(i).toString());
shop.name = json.getString("name");
shop.pos = new LatLng(Double.parseDouble(json.getString("latitude")),Double.parseDouble(json.getString("longitude")));
shops.add(shop);
}
viewmap1();
return;
}
}
catch(Exception e)
{
prog.dismiss();
return;
}
}
}
}

I believe there were some updates with Google Maps, which were not applied on older devices. Try updating older devices, if not done so. Or just make another version of app for older devices

Location not updating using google maps apiv2

I m struggling for integrating google maps in my app. I have somehow managed to display map with user location and nearby locations but the location is not updating...I have gone through the code several time but havent found a single incorrect command..plz help me sort it out..
NearbyPlacesActivity -
package com.example.travelplanner;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;
/*
* MyMapActivity class forms part of Map application
* in Mobiletuts+ tutorial series:
* Using Google Maps and Google Places in Android Apps
*
* This version of the class is for the final part of the series.
*
* Sue Smith
* March/ April 2013
*/
public class NearbyPlacesActivity extends Activity implements LocationListener {
//instance variables for Marker icon drawable resources
private int userIcon, foodIcon, drinkIcon, shopIcon, otherIcon;
//the map
private GoogleMap theMap;
//location manager
private LocationManager locMan;
//user marker
private Marker userMarker;
//places of interest
private Marker[] placeMarkers;
//max
private final int MAX_PLACES = 20;//most returned from google
//marker options
private MarkerOptions[] places;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nearby_places);
//get drawable IDs
userIcon = R.drawable.yellow_point;
foodIcon = R.drawable.red_point;
drinkIcon = R.drawable.blue_point;
shopIcon = R.drawable.green_point;
otherIcon = R.drawable.purple_point;
//find out if we already have it
if(theMap==null){
//get the map
theMap = ((MapFragment)getFragmentManager().findFragmentById(R.id.the_map)).getMap();
//check in case map/ Google Play services not available
if(theMap!=null){
//ok - proceed
theMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
//create marker array
placeMarkers = new Marker[MAX_PLACES];
//update location
updatePlaces();
}
}
}
//location listener functions
#Override
public void onLocationChanged(Location location) {
Log.v("MyMapActivity", "location changed");
updatePlaces();
}
#Override
public void onProviderDisabled(String provider){
Log.v("MyMapActivity", "provider disabled");
}
#Override
public void onProviderEnabled(String provider) {
Log.v("MyMapActivity", "provider enabled");
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
Log.v("MyMapActivity", "status changed");
}
/*
* update the place markers
*/
private void updatePlaces(){
//get location manager
locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
//get last location
Location lastLoc = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
double lat = lastLoc.getLatitude();
double lng = lastLoc.getLongitude();
Toast.makeText(getApplicationContext(), lat+","+lng, Toast.LENGTH_LONG).show();
//create LatLng
LatLng lastLatLng = new LatLng(lat, lng);
//remove any existing marker
if(userMarker!=null) userMarker.remove();
//create and set marker properties
userMarker = theMap.addMarker(new MarkerOptions()
.position(lastLatLng)
.title("You are here")
.icon(BitmapDescriptorFactory.fromResource(userIcon))
.snippet("Your last recorded location"));
//move to location
theMap.animateCamera(CameraUpdateFactory.newLatLng(lastLatLng), 3000, null);
//build places query string
String placesSearchStr = "https://maps.googleapis.com/maps/api/place/nearbysearch/" +
"json?location="+lat+","+lng+
"&radius=7000&sensor=true" +
"&types=food|bar|movie_theater|museum|bank"+
"&key=AIzaSyBqDgqbxFenOtooTivY5YSsJ2JrwBK42hw";//ADD KEY
//execute query
new GetPlaces().execute(placesSearchStr);
locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 100, this);
}
private class GetPlaces extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... placesURL) {
//fetch places
//build result as string
StringBuilder placesBuilder = new StringBuilder();
//process search parameter string(s)
for (String placeSearchURL : placesURL) {
HttpClient placesClient = new DefaultHttpClient();
try {
//try to fetch the data
//HTTP Get receives URL string
HttpGet placesGet = new HttpGet(placeSearchURL);
//execute GET with Client - return response
HttpResponse placesResponse = placesClient.execute(placesGet);
//check response status
StatusLine placeSearchStatus = placesResponse.getStatusLine();
//only carry on if response is OK
if (placeSearchStatus.getStatusCode() == 200) {
//get response entity
HttpEntity placesEntity = placesResponse.getEntity();
//get input stream setup
InputStream placesContent = placesEntity.getContent();
//create reader
InputStreamReader placesInput = new InputStreamReader(placesContent);
//use buffered reader to process
BufferedReader placesReader = new BufferedReader(placesInput);
//read a line at a time, append to string builder
String lineIn;
while ((lineIn = placesReader.readLine()) != null) {
placesBuilder.append(lineIn);
}
}
}
catch(Exception e){
e.printStackTrace();
}
}
return placesBuilder.toString();
}
//process data retrieved from doInBackground
protected void onPostExecute(String result) {
//parse place data returned from Google Places
//remove existing markers
if(placeMarkers!=null){
for(int pm=0; pm<placeMarkers.length; pm++){
if(placeMarkers[pm]!=null)
placeMarkers[pm].remove();
}
}
try {
//parse JSON
//create JSONObject, pass stinrg returned from doInBackground
JSONObject resultObject = new JSONObject(result);
//get "results" array
JSONArray placesArray = resultObject.getJSONArray("results");
//marker options for each place returned
places = new MarkerOptions[placesArray.length()];
//loop through places
for (int p=0; p<placesArray.length(); p++) {
//parse each place
//if any values are missing we won't show the marker
boolean missingValue=false;
LatLng placeLL=null;
String placeName="";
String vicinity="";
int currIcon = otherIcon;
try{
//attempt to retrieve place data values
missingValue=false;
//get place at this index
JSONObject placeObject = placesArray.getJSONObject(p);
//get location section
JSONObject loc = placeObject.getJSONObject("geometry")
.getJSONObject("location");
//read lat lng
placeLL = new LatLng(Double.valueOf(loc.getString("lat")),
Double.valueOf(loc.getString("lng")));
//get types
JSONArray types = placeObject.getJSONArray("types");
//loop through types
for(int t=0; t<types.length(); t++){
//what type is it
String thisType=types.get(t).toString();
//check for particular types - set icons
if(thisType.contains("food")){
currIcon = foodIcon;
break;
}
else if(thisType.contains("bar")){
currIcon = drinkIcon;
break;
}
else if(thisType.contains("movie_theater")){
currIcon = shopIcon;
break;
}
}
//vicinity
vicinity = placeObject.getString("vicinity");
//name
placeName = placeObject.getString("name");
}
catch(JSONException jse){
Log.v("PLACES", "missing value");
missingValue=true;
jse.printStackTrace();
}
//if values missing we don't display
if(missingValue) places[p]=null;
else
places[p]=new MarkerOptions()
.position(placeLL)
.title(placeName)
.icon(BitmapDescriptorFactory.fromResource(currIcon))
.snippet(vicinity);
}
}
catch (Exception e) {
e.printStackTrace();
}
if(places!=null && placeMarkers!=null){
for(int p=0; p<places.length && p<placeMarkers.length; p++){
//will be null if a value was missing
if(places[p]!=null)
placeMarkers[p]=theMap.addMarker(places[p]);
}
}
}
}
#Override
protected void onResume() {
super.onResume();
if(theMap!=null){
locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 100, this);
}
}
#Override
protected void onPause() {
super.onPause();
if(theMap!=null){
locMan.removeUpdates(this);
}
}
}
There is no error in logcat. The Manifest is accurate as per my concern...the API keys are also correct..
There is one more thing I want to know....How can I show a particular city's map by clickin on a button of previous activity..for eg: In activity one i typed New York in edittext and clicked button and it opened Activity two containing map and points to New York city...I also want to show the tourist attractions in newyork by different markers.... Can someone show me a way or tut for this..thanks in advance
This is the Revised code as per your guidance..
package com.example.travelplanner;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URLEncoder;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;
/*
* MyMapActivity class forms part of Map application
* in Mobiletuts+ tutorial series:
* Using Google Maps and Google Places in Android Apps
*
* This version of the class is for the final part of the series.
*
* Sue Smith
* March/ April 2013
*/
public class NearbyPlacesActivity extends Activity implements LocationListener {
//instance variables for Marker icon drawable resources
private int userIcon, foodIcon, drinkIcon, shopIcon, otherIcon;
//the map
private GoogleMap theMap;
//location manager
private LocationManager locMan;
//user marker
private Marker userMarker;
//places of interest
private Marker[] placeMarkers;
//max
private final int MAX_PLACES = 20;//most returned from google
//marker options
private MarkerOptions[] places;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nearby_places);
//get drawable IDs
userIcon = R.drawable.yellow_point;
foodIcon = R.drawable.red_point;
drinkIcon = R.drawable.blue_point;
shopIcon = R.drawable.green_point;
otherIcon = R.drawable.purple_point;
//find out if we already have it
if(theMap==null){
//get the map
theMap = ((MapFragment)getFragmentManager().findFragmentById(R.id.the_map)).getMap();
//check in case map/ Google Play services not available
if(theMap!=null){
//ok - proceed
theMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
//create marker array
placeMarkers = new Marker[MAX_PLACES];
}
}
}
//location listener functions
#Override
public void onLocationChanged(Location location) {
Log.v("MyMapActivity", "location changed");
updatePlaces(location);
}
#Override
public void onProviderDisabled(String provider){
Log.v("MyMapActivity", "provider disabled");
}
#Override
public void onProviderEnabled(String provider) {
Log.v("MyMapActivity", "provider enabled");
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
Log.v("MyMapActivity", "status changed");
}
/*
* update the place markers
*/
private void updatePlaces(Location givenlocation){
//get location manager
double lat = givenlocation.getLatitude();
double lng = givenlocation.getLongitude();
Toast.makeText(getApplicationContext(), lat+","+lng, Toast.LENGTH_LONG).show();
//create LatLng
LatLng lastLatLng = new LatLng(lat, lng);
//remove any existing marker
if(userMarker!=null) userMarker.remove();
//create and set marker properties
userMarker = theMap.addMarker(new MarkerOptions()
.position(lastLatLng)
.title("You are here")
.icon(BitmapDescriptorFactory.fromResource(userIcon))
.snippet("Your last recorded location"));
//move to location
theMap.animateCamera(CameraUpdateFactory.newLatLng(lastLatLng), 3000, null);
//build places query string
#SuppressWarnings("deprecation")
String encodedstr = URLEncoder.encode("food|bar|movie_theater|museum|bank");
String placesSearchStr = "https://maps.googleapis.com/maps/api/place/nearbysearch/" +
"json?location="+lat+","+lng+
"&radius=7000&sensor=true"+
"&types="+encodedstr+
"&key=AIzaSyBqDgqbxFenOtooTivY5YSsJ2JrwBK42hw";//ADD KEY
//execute query
new GetPlaces().execute(placesSearchStr);
locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 100, this);
}
private class GetPlaces extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... placesURL) {
//fetch places
//build result as string
StringBuilder placesBuilder = new StringBuilder();
//process search parameter string(s)
for (String placeSearchURL : placesURL) {
HttpClient placesClient = new DefaultHttpClient();
try {
//try to fetch the data
//HTTP Get receives URL string
HttpGet placesGet = new HttpGet(placeSearchURL);
//execute GET with Client - return response
HttpResponse placesResponse = placesClient.execute(placesGet);
//check response status
StatusLine placeSearchStatus = placesResponse.getStatusLine();
//only carry on if response is OK
if (placeSearchStatus.getStatusCode() == 200) {
//get response entity
HttpEntity placesEntity = placesResponse.getEntity();
//get input stream setup
InputStream placesContent = placesEntity.getContent();
//create reader
InputStreamReader placesInput = new InputStreamReader(placesContent);
//use buffered reader to process
BufferedReader placesReader = new BufferedReader(placesInput);
//read a line at a time, append to string builder
String lineIn;
while ((lineIn = placesReader.readLine()) != null) {
placesBuilder.append(lineIn);
}
}
}
catch(Exception e){
e.printStackTrace();
}
}
return placesBuilder.toString();
}
//process data retrieved from doInBackground
protected void onPostExecute(String result) {
//parse place data returned from Google Places
//remove existing markers
if(placeMarkers!=null){
for(int pm=0; pm<placeMarkers.length; pm++){
if(placeMarkers[pm]!=null)
placeMarkers[pm].remove();
}
}
try {
//parse JSON
//create JSONObject, pass stinrg returned from doInBackground
JSONObject resultObject = new JSONObject(result);
//get "results" array
JSONArray placesArray = resultObject.getJSONArray("results");
//marker options for each place returned
places = new MarkerOptions[placesArray.length()];
//loop through places
for (int p=0; p<placesArray.length(); p++) {
//parse each place
//if any values are missing we won't show the marker
boolean missingValue=false;
LatLng placeLL=null;
String placeName="";
String vicinity="";
int currIcon = otherIcon;
try{
//attempt to retrieve place data values
missingValue=false;
//get place at this index
JSONObject placeObject = placesArray.getJSONObject(p);
//get location section
JSONObject loc = placeObject.getJSONObject("geometry")
.getJSONObject("location");
//read lat lng
placeLL = new LatLng(Double.valueOf(loc.getString("lat")),
Double.valueOf(loc.getString("lng")));
//get types
JSONArray types = placeObject.getJSONArray("types");
//loop through types
for(int t=0; t<types.length(); t++){
//what type is it
String thisType=types.get(t).toString();
//check for particular types - set icons
if(thisType.contains("food")){
currIcon = foodIcon;
break;
}
else if(thisType.contains("bar")){
currIcon = drinkIcon;
break;
}
else if(thisType.contains("movie_theater")){
currIcon = shopIcon;
break;
}
}
//vicinity
vicinity = placeObject.getString("vicinity");
//name
placeName = placeObject.getString("name");
}
catch(JSONException jse){
Log.v("PLACES", "missing value");
missingValue=true;
jse.printStackTrace();
}
//if values missing we don't display
if(missingValue) places[p]=null;
else
places[p]=new MarkerOptions()
.position(placeLL)
.title(placeName)
.icon(BitmapDescriptorFactory.fromResource(currIcon))
.snippet(vicinity);
}
}
catch (Exception e) {
e.printStackTrace();
}
if(places!=null && placeMarkers!=null){
for(int p=0; p<places.length && p<placeMarkers.length; p++){
//will be null if a value was missing
if(places[p]!=null)
placeMarkers[p]=theMap.addMarker(places[p]);
}
}
}
}
#Override
protected void onResume() {
super.onResume();
if(theMap!=null){
//get location manager
locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
//get last location
Location lastLoc = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 100, this);
updatePlaces(lastLoc);
}
}
#Override
protected void onPause() {
super.onPause();
if(theMap!=null){
locMan.removeUpdates(this);
}
}
}
Please have a check on it...it is not updating my location...although its showinng nearby locations..thanks in advance

The problems seems to be that whenever you get a call to onLocationChanged(), you are calling updatePlaces() method where you are reintialising your location manager. The line locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE); will return a new instance of the location manager and then you are calling getLastKnownLocation for this new location manager. Your getLastKnownLocation must be returning an outdated location information and hence you may not be seeing any update. You end up using this location instead of the fresh location return by your change listener.
You can initialise these and call updatePlaces in onResume like below :
#Override
protected void onResume() {
super.onResume();
if(theMap!=null){
//get location manager
locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
//get last location
Location lastLoc = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 100, this);
updatePlaces(lastLoc)
}
}
Modify locationchanged:
#Override
public void onLocationChanged(Location location) {
Log.v("MyMapActivity", "location changed");
updatePlaces(location);
}
Modify updateplaces:
private void updatePlaces(Location givenlocation){
double lat = givenlocation.getLatitude();
double lng = givenlocation.getLongitude();
Toast.makeText(getApplicationContext(), lat+","+lng, Toast.LENGTH_LONG).show();
//create LatLng
LatLng lastLatLng = new LatLng(lat, lng);
*****Call further steps using the above location ******
Currently you are using the location API that is part of android platform . I would also suggest you can migrate to the new The Google Location Services API, part of Google Play Services as it handles location updates and battery conservation in an improved manner.