I'm creating a GPS tracker application in android. Now I've written some basic code that pinpoints users location(latitude + longitude) on his/her android screen.
The problem is, when everything is said and done, it's showing a value 0.0. for both latitude and longitude.
Why is it happening?
Below is the code...
MainActivity.java file
package vidyabusapplication.android.com.vidyabusapplication;
import android.Manifest;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.test.mock.MockPackageManager;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
Button Btn_trackLocation;
private static final int REQUEST_CODE_PERMISSION = 2;
String mPermission = Manifest.permission.ACCESS_FINE_LOCATION;
GPSTracker gps;
TextView location;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
try {
if(ActivityCompat.checkSelfPermission(this, mPermission) != MockPackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[] {mPermission}, REQUEST_CODE_PERMISSION);
}
}catch(Exception ex) {
ex.printStackTrace();
}
Btn_trackLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
gps = new GPSTracker(MainActivity.this);
if(gps.canYouGetLocation()) {
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
location.setText(latitude+" "+longitude);
}
else {
gps.enableGpsViaSettingsOptionAlert();
}
}
});
}
public void init() {
location = findViewById(R.id.trackLocationText);
Btn_trackLocation = findViewById(R.id.startTrackingButton);
}
}
GPSTracker.java file
Package vidyabusapplication.android.com.vidyabusapplication;
import android.Manifest;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
/**
* Created by mental on 27/2/18.
*/
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
boolean isGPSEnabled = false;
boolean isNetWorkEnabled = false;
boolean canYouGetLocation = false;
Location location;
double latitude, longitude;
private static final long MIN_DISTANCE_FOR_UPDATES = 10;
private static final long MIN_TIME_BW_UPDATES = 60000;
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager)mContext.getSystemService(LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetWorkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if(!isGPSEnabled && !isNetWorkEnabled) {
}
else {
this.canYouGetLocation = true;
if (isNetWorkEnabled) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
return null;
}
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_FOR_UPDATES, this);
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_FOR_UPDATES, this);
}
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}catch(Exception ex) {
ex.printStackTrace();
}
return location;
}
public void stopUsingGPS() {
if(locationManager != null) {
if(ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
return;
}
locationManager.removeUpdates(GPSTracker.this);
}
}
public double getLatitude() {
if(location != null) {
latitude = location.getLatitude();
}
return latitude;
}
public double getLongitude() {
if(location != null) {
longitude = location.getLongitude();
}
return longitude;
}
public boolean canYouGetLocation() {
return this.canYouGetLocation;
}
public void enableGpsViaSettingsOptionAlert() {
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle("GPS DISABLED!");
dialog.setMessage("Want to enable it now?");
dialog.setPositiveButton("Enable", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
mContext.startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
});
dialog.setNegativeButton("Dismiss", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
dialog.show();
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}
activity_main.xml file
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="vidyabusapplication.android.com.vidyabusapplication.MainActivity">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:gravity="center">
<TextView
android:id="@+id/trackLocationText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Track Location"
android:textSize="22sp"
android:textColor="#000000" />
<Button
android:layout_width="300dp"
android:layout_height="60dp"
android:id="@+id/startTrackingButton"
android:layout_marginTop="10dp"
android:text="Start"
android:textStyle="bold"/>
</LinearLayout>
</RelativeLayout>
It is to be taken in account that I've all the permissions for location pinpointing inside my androidManifest.xml file.
