位置始终为空

Question

This is my android project. The app shows info about current location.
However, the app always shows that the location is null. I've searched about it a lot but still wasn't able to find the solution or wasn't able to implement the solution.

Here is my MainActivity code,

package com.learning.pranavjain.hikerswatch;

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.WindowManager;
import android.widget.TextView;

import java.io.IOException; 
import java.util.List;
import java.util.Locale;

public class MainActivity extends Activity implements LocationListener {

LocationManager locationManager;
String provider;
String sLatitude;
String sLongitude;
String sAccuracy;
String sSpeed;
String sAltitude;
TextView addressTV;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //Hiding the status bar
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_main);

    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    provider = locationManager.getBestProvider(new Criteria(),false);

    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    locationManager.requestLocationUpdates(provider,400,1,this);
    location = locationManager.getLastKnownLocation(provider);

    if(location==null){
        Log.i("Location1","NULL1");
        Toast.makeText(this,"Location not found",Toast.LENGTH_SHORT).show();
    }

    if(location!=null) {
        onLocationChanged(location);
        Log.i("Location1","Reached here");
    }

}

@Override
protected void onResume() {
    super.onResume();


    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    locationManager.requestLocationUpdates(provider, 400, 1, this);
}

@Override
public void onLocationChanged(Location location) {



    Double lat = location.getLatitude();
    Double lng = location.getLongitude();
    Float acc = location.getAccuracy();
    Float spe = location.getSpeed();
    Double alt = location.getAltitude();

    Log.i("Location","reached here");

    TextView latitude = (TextView) findViewById(R.id.latitude);
    TextView longitude = (TextView) findViewById(R.id.longitude);
    TextView accuracy = (TextView) findViewById(R.id.accuracy);
    TextView speed = (TextView) findViewById(R.id.speed);
    TextView altitude = (TextView) findViewById(R.id.altitude);
    addressTV = (TextView) findViewById(R.id.address);

    sLatitude = latitude.getText().toString();
    sLongitude = longitude.getText().toString();
    sAccuracy = accuracy.getText().toString();
    sSpeed = speed.getText().toString();
    sAltitude = altitude.getText().toString();

    sLatitude += Double.toString(lat);
    sLongitude += Double.toString(lng);
    sAccuracy += Double.toString(acc);
    sSpeed += Double.toString(spe);
    sAltitude += Double.toString(alt);

    latitude.setText(sLatitude);
    longitude.setText(sLongitude);
    accuracy.setText(sAccuracy);
    speed.setText(sSpeed);
    altitude.setText(sAltitude);

    Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());

    try {
        List<Address> listAddresses = geocoder.getFromLocation(lat, lng, 1);

        if (listAddresses != null && listAddresses.size() > 0 ) {

            Log.i("PlaceInfo", listAddresses.get(0).toString());

            String addressHolder = "";

            for (int i = 0; i <= listAddresses.get(0).getMaxAddressLineIndex(); i++) {

                addressHolder += listAddresses.get(0).getAddressLine(i) + "\n";

            }

            addressTV.setText("Address:\n" + addressHolder);

        }

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

    Log.i("Location:", String.valueOf(lat));
    Log.i("Location:", lng.toString());

}

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

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}

@Override
protected void onPause() {
    super.onPause();

    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    locationManager.removeUpdates(this);

 }
}

Here is my Manifest code,

<?xml version="1.0" encoding="utf-8"?>

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-feature android:name="android.hardware.location.network" />
<uses-feature android:name="android.hardware.location.gps" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

The whole project can be found at here (GitHub)

Answer 1

getLastKnownLocation returns a cached value. It does not turn on location tracking. So unless some other app has recently turned on location tracking, it won't have a good value to give you and returns null. If you want an assured value, you need to turn on location tracking via requestLocationUpdates or requestSingleUpdate . Either of these will tell the OS to figure out your current location and give you a callback when its done. Please note that the callback may take some time to be called- especially for GPS. And if the phone can't get network info/GPS satelitle data, then it will never make the callback.

Answer 2

You can take a look to RxGpsService (An Android service to retrieve GPS locations and route stats using RxJava). It retrieves a RouteStats object which contains the current speed, distance, time elapsed and waypoints.

Answer 3

hi why trying to use getLastKnownLocation .It return your previous latitude and longitude and it might take some time to update lastknown location . Most probably it retrun you null after on your location.

I'm just referring you google Fused api for location any kind of updation or current.Its very accurate.

How you can fused api in your project.See i'll give you small example.

Step 1. Make this class GoogleLocationService.java

public class GoogleLocationService {
private GoogleServicesCallbacks callbacks = new GoogleServicesCallbacks();
LocationUpdateListener locationUpdateListener;
Context activity;
protected GoogleApiClient mGoogleApiClient;
protected LocationRequest mLocationRequest;

public static final long UPDATE_INTERVAL_IN_MILLISECONDS = 30000;


public GoogleLocationService(Context activity, LocationUpdateListener locationUpdateListener) {
    this.locationUpdateListener = locationUpdateListener;
    this.activity = activity;
    buildGoogleApiClient();
}

protected synchronized void buildGoogleApiClient() {
    //Log.i(TAG, "Building GoogleApiClient");
    mGoogleApiClient = new GoogleApiClient.Builder(activity)
            .addConnectionCallbacks(callbacks)
            .addOnConnectionFailedListener(callbacks)
            .addApi(LocationServices.API)
            .build();
    createLocationRequest();
    mGoogleApiClient.connect();
}

protected void createLocationRequest() {
    mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

}

private class GoogleServicesCallbacks implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {

    @Override
    public void onConnected(Bundle bundle) {
        startLocationUpdates();
    }

    @Override
    public void onConnectionSuspended(int i) {
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

        if (connectionResult.getErrorCode() == ConnectionResult.SERVICE_VERSION_UPDATE_REQUIRED) {
            Toast.makeText(activity, "Google play service not updated", Toast.LENGTH_LONG).show();

        }
        locationUpdateListener.cannotReceiveLocationUpdates();
    }

    @Override
    public void onLocationChanged(Location location) {
        if (location.hasAccuracy()) {
            if (location.getAccuracy() < 30) {
                locationUpdateListener.updateLocation(location);
            }
        }
    }
}

private static boolean locationEnabled(Context context) {
    boolean gps_enabled = false;
    LocationManager lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
    try {
        gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return gps_enabled;
}

private boolean servicesConnected(Context context) {
    return isPackageInstalled(GooglePlayServicesUtil.GOOGLE_PLAY_STORE_PACKAGE, context);
}

private boolean isPackageInstalled(String packagename, Context context) {
    PackageManager pm = context.getPackageManager();
    try {
        pm.getPackageInfo(packagename, PackageManager.GET_ACTIVITIES);
        return true;
    } catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
        return false;
    }
}


public void startUpdates() {
    /*
     * Connect the client. Don't re-start any requests here; instead, wait
     * for onResume()
     */
    if (servicesConnected(activity)) {
        if (locationEnabled(activity)) {
            locationUpdateListener.canReceiveLocationUpdates();
            startLocationUpdates();
        } else {
            locationUpdateListener.cannotReceiveLocationUpdates();
            Toast.makeText(activity, "Unable to get your location.Please turn on your device Gps", Toast.LENGTH_LONG).show();
        }
    } else {
        locationUpdateListener.cannotReceiveLocationUpdates();
        Toast.makeText(activity, "Google play service not available", Toast.LENGTH_LONG).show();
    }
}

//stop location updates
public void stopUpdates() {
    stopLocationUpdates();
}

//start location updates
private void startLocationUpdates() {

    if (checkSelfPermission(activity, ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(activity, ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        return;
    }
    if (mGoogleApiClient.isConnected()) {
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, callbacks);
    }
}

public void stopLocationUpdates() {
    if (mGoogleApiClient.isConnected()) {
        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, callbacks);
    }
}

public void startGoogleApi() {
    mGoogleApiClient.connect();
}

public void closeGoogleApi() {
    mGoogleApiClient.disconnect();
}

 }

Step2. Make this interface LocationUpdateListener.java

 public interface LocationUpdateListener {

/**
 * Called immediately the service starts if the service can obtain location
 */
void canReceiveLocationUpdates();

/**
 * Called immediately the service tries to start if it cannot obtain location - eg the user has disabled wireless and
 */
void cannotReceiveLocationUpdates();

/**
 * Called whenever the location has changed (at least non-trivially)
 * @param location
 */
void updateLocation(Location location);

/**
 * Called when GoogleLocationServices detects that the device has moved to a new location.
 * @param localityName The name of the locality (somewhere below street but above area).
 */
void updateLocationName(String localityName, Location location);
}

Step 3. Use this piece of code where you want to get location

public class MainActivity extends ActionBarActivity {

private GoogleLocationService googleLocationService;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    googleLocationService = new GoogleLocationService(context, new LocationUpdateListener() {
    @Override
    public void canReceiveLocationUpdates() {
    }

    @Override
    public void cannotReceiveLocationUpdates() {
    }

    //update location to our servers for tracking purpose
    @Override
    public void updateLocation(Location location) {
        if (location != null ) {
            Timber.e("updated location %1$s %2$s", location.getLatitude(), location.getLongitude());

        }
    }

    @Override
    public void updateLocationName(String localityName, Location location) {

        googleLocationService.stopLocationUpdates();
    }
});
googleLocationService.startUpdates();


}

@Override
public void onDestroy() {
    super.onDestroy();
if (googleLocationService != null) {
    googleLocationService.stopLocationUpdates();
}

}
}

Hope this will help you.

Answer 4

You can use this code

MainActivity.java

import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentSender;
import android.content.pm.PackageManager;
import android.location.Location;
import android.net.Uri;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
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.location.LocationSettingsRequest;
import com.google.android.gms.location.LocationSettingsResult;
import com.google.android.gms.location.LocationSettingsStates;
import com.google.android.gms.location.LocationSettingsStatusCodes;
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.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 java.text.DateFormat;
import java.util.Date;

public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener, LocationListener, OnMapReadyCallback {

    private GoogleApiClient mGoogleApiClient;
    private LocationRequest mLocationRequest;
    private Location mCurrentLocation;
    private String mLocationUpdatedDate;

    private TextView mLatitude;
    private TextView mLongitude;
    private TextView mDateText;

    private GoogleMap mMap;
    private Marker mCurrentMarker;

    private final int MY_PERMISSIONS_REQUEST_READ_LOCATION = 100;
    private final int REQUEST_CHECK_SETTINGS = 101;
    private final int REQUEST_PERMISSION_SETTING = 102;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mLatitude = (TextView) findViewById(R.id.latText);
        mLongitude = (TextView) findViewById(R.id.longText);
        mDateText = (TextView) findViewById(R.id.dateText);

        if (mGoogleApiClient == null) {
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .addApi(LocationServices.API)
                    .build();
        }

        createLocationRequest();

        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

    }

    private void fetchLocation() {

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(
                    mGoogleApiClient);
        }
    }

    private void updateUI() {
        if (mCurrentLocation != null) {
            mLatitude.setText(String.valueOf(mCurrentLocation.getLatitude()));
            mLongitude.setText(String.valueOf(mCurrentLocation.getLongitude()));
            mDateText.setText(mLocationUpdatedDate);
        }
    }


    protected void onStart() {
        mGoogleApiClient.connect();
        super.onStart();
    }

    protected void onStop() {
        mGoogleApiClient.disconnect();
        super.onStop();
    }


    @Override
    public void onConnected(@Nullable Bundle bundle) {
        if (ActivityCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.ACCESS_COARSE_LOCATION)
                != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {

            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
                    MY_PERMISSIONS_REQUEST_READ_LOCATION);

        } else {
            fetchLocation();
            updateUI();

            startLocationUpdates();

        }

    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }


    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(10000);
        mLocationRequest.setFastestInterval(5000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
                .addLocationRequest(mLocationRequest);

        PendingResult<LocationSettingsResult> result =
                LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient,
                        builder.build());


        result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
            @Override
            public void onResult(@NonNull LocationSettingsResult result) {
                final Status status = result.getStatus();
                //   final LocationSettingsStates  = result.getLocationSettingsStates();
                switch (status.getStatusCode()) {
                    case LocationSettingsStatusCodes.SUCCESS:
                        // All location settings are satisfied. The client can
                        // initialize location requests here.

                        break;
                    case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
                        // Location settings are not satisfied, but this can be fixed
                        // by showing the user a dialog.
                        try {
                            // Show the dialog by calling startResolutionForResult(),
                            // and check the result in onActivityResult().
                            status.startResolutionForResult(
                                    MainActivity.this,
                                    REQUEST_CHECK_SETTINGS);
                        } catch (IntentSender.SendIntentException e) {
                            // Ignore the error.
                        }
                        break;
                    case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                        // Location settings are not satisfied. However, we have no way
                        // to fix the settings so we won't show the dialog.

                        break;
                }
            }
        });

    }


    protected void startLocationUpdates() {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {

            LocationServices.FusedLocationApi.requestLocationUpdates(
                    mGoogleApiClient, mLocationRequest, this);
        }
    }

    protected void stopLocationUpdates() {
        LocationServices.FusedLocationApi.removeLocationUpdates(
                mGoogleApiClient, this);
    }


    @Override
    protected void onPause() {
        if (!mGoogleApiClient.isConnected())
            stopLocationUpdates();
        super.onPause();

    }

    @Override
    protected void onResume() {
        if (mGoogleApiClient.isConnected()) {
            startLocationUpdates();
        }
        super.onResume();

    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_READ_LOCATION: {
                // If request is cancelled, the result arrays are empty.
                //   String permission = permissions[0];
                for (int i = 0, len = permissions.length; i < len; i++) {
                    String permission = permissions[0];
                    if (grantResults.length > 0
                            && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                        fetchLocation();
                        updateUI();

                    } else {

                        if (!ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, permission)) {

                            // user denied WITH never ask again
                            showSettingDialog();


                        } else if (Manifest.permission.ACCESS_COARSE_LOCATION.equals(permission)) {
                            showPermissionDialog();
                            // user denied WITHOUT never ask again
                            // this is a good place to explain the user
                            // why you need the permission and ask if he want
                            // to accept it (the rationale)
                        }


                    }
                    return;
                }
            }

            // other 'case' lines to check for other
            // permissions this app might request
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == REQUEST_PERMISSION_SETTING) {
            // updateUI(fetchLocation());

            Toast.makeText(MainActivity.this, "RequestCode = " + requestCode + "  ResultCode = " + resultCode, Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onLocationChanged(Location location) {
        mCurrentLocation = location;
        mLocationUpdatedDate = DateFormat.getTimeInstance().format(new Date());
        updateUI();

        if (mCurrentMarker != null) {
            mCurrentMarker.remove();

        }

        if (mMap != null) {
           /* LatLng currentPosition = new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude());
            mMap.addMarker(new MarkerOptions().position(currentPosition).title("Myself"));
            mMap.moveCamera(CameraUpdateFactory.newLatLng(currentPosition));*/

            LatLng latLng = new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude());
            mCurrentMarker = mMap.addMarker(new MarkerOptions().position(latLng).title("Abhishek").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE)));
            // Showing the current location in Google Map
            mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));

            // Zoom in the Google Map
            mMap.animateCamera(CameraUpdateFactory.zoomTo(20));
        }


    }


    private void showPermissionDialog() {

        final AlertDialog dialog = new AlertDialog.Builder(MainActivity.this).create();
        dialog.setButton(AlertDialog.BUTTON_POSITIVE, "Ok", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {

                dialog.cancel();
                ActivityCompat.requestPermissions(MainActivity.this,
                        new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
                        MY_PERMISSIONS_REQUEST_READ_LOCATION);

            }
        });
        dialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialog.cancel();
            }
        });

        dialog.setTitle("Location explaination");
        dialog.setMessage("Location permission is taken so that we can provide you with better service");
        dialog.show();
    }

    private void showSettingDialog() {

        final AlertDialog dialog = new AlertDialog.Builder(MainActivity.this).create();
        dialog.setButton(AlertDialog.BUTTON_POSITIVE, "Ok", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {


                Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                Uri uri = Uri.fromParts("package", getPackageName(), null);
                intent.setData(uri);
                startActivityForResult(intent, REQUEST_PERMISSION_SETTING);
                dialog.cancel();

            }
        });
        dialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialog.cancel();
            }
        });

        dialog.setTitle("Permission Denied");
        dialog.setMessage("Please enable location from your app setting screen");
        dialog.show();
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {


        mMap = googleMap;
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
                ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            mMap.setMyLocationEnabled(true);
        }



        // Add a marker in Sydney and move the camera
        if(mCurrentLocation != null) {
            LatLng currentPosition = new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude());
            mMap.addMarker(new MarkerOptions().position(currentPosition).title("Myself"));
            mMap.moveCamera(CameraUpdateFactory.newLatLng(currentPosition));
        }
    }
}

activity_main

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="abhishek.com.testing.MainActivity">


    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="abhishek.com.testing.MapsActivity" />



    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center_horizontal"
        android:weightSum="3">

        <TextView
            android:id="@+id/latText"
            android:layout_width="wrap_content"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:text="Latitude" />


        <TextView
            android:id="@+id/longText"
            android:layout_width="wrap_content"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:text="Longitude" />


        <TextView
            android:id="@+id/dateText"
            android:layout_width="wrap_content"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:text="Updated at"/>

    </LinearLayout>



</RelativeLayout>