MainActivity.java

package com.mobidev.locationapi;

import android.content.Intent;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

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


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


    private GoogleApiClient mGoogleApiClient;
    private Location mLastLocation;
    private LocationRequest mLocationRequest;
    private static int REQUEST_CODE_RECOVER_PLAY_SERVICES = 200;


    private TextView txtAddress;

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

        txtAddress = (TextView) findViewById(R.id.address);

        /**
         * We need Google Play Services, and therefore we have to check if it is present first̵
         */
        if (checkGooglePlayServices()) {
            buildGoogleApiClient();

            //prepare connection request
            createLocationRequest();
        }
    }

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

            if (resultCode == RESULT_OK) {
                // Make sure the app is not already connected or attempting to connect
                if (!mGoogleApiClient.isConnecting() &&
                        !mGoogleApiClient.isConnected()) {
                    mGoogleApiClient.connect();
                }
            } else if (resultCode == RESULT_CANCELED) {
                Toast.makeText(this, "Google Play Services must be installed.",
                        Toast.LENGTH_SHORT).show();
                finish();
            }
        }
    }

    /**
     * Create the connection
     */
    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();

    }


    /**
     * triggered when Google Play Services is connected
     *
     * @param bundle
     */
    @Override
    public void onConnected(Bundle bundle) {

        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
                mGoogleApiClient);
        if (mLastLocation != null) {

            Toast.makeText(this, "Latitude:" + mLastLocation.getLatitude() + ", Longitude:" + mLastLocation.getLongitude(), Toast.LENGTH_LONG).show();

            showAddress(mLastLocation.getLatitude(), mLastLocation.getLongitude());
        }
//        startLocationUpdates();

    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

    }


    /* Second part*/

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

        if (mGoogleApiClient != null) {
            mGoogleApiClient.connect();
        }

    }

    protected void startLocationUpdates() {
        LocationServices.FusedLocationApi.requestLocationUpdates(
                mGoogleApiClient, mLocationRequest, this);
    }

    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(20000);//provide update after every 20 seconds
        mLocationRequest.setFastestInterval(5000);// provide update if there is an update after 5 seconds also
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    }

    @Override
    public void onLocationChanged(Location location) {
        mLastLocation = location;
        Toast.makeText(this, "Update -> Latitude:" + mLastLocation.getLatitude() + ", Longitude:" + mLastLocation.getLongitude(), Toast.LENGTH_LONG).show();



    }

    protected void stopLocationUpdates() {
        if (mGoogleApiClient != null) {
            LocationServices.FusedLocationApi.removeLocationUpdates(
                    mGoogleApiClient, this);
        }
    }

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

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

        if (mGoogleApiClient != null) {
            mGoogleApiClient.disconnect();
        }


    }

    private boolean checkGooglePlayServices() {
        int checkGooglePlayServices = GooglePlayServicesUtil
                .isGooglePlayServicesAvailable(getApplicationContext());
        if (checkGooglePlayServices != ConnectionResult.SUCCESS) {
        /*
		* Google Play Services is missing or update is required
		*  return code could be
		* SUCCESS,
		* SERVICE_MISSING, SERVICE_VERSION_UPDATE_REQUIRED,
		* SERVICE_DISABLED, SERVICE_INVALID.
		*/
            GooglePlayServicesUtil.getErrorDialog(checkGooglePlayServices,
                    this, REQUEST_CODE_RECOVER_PLAY_SERVICES).show();

            return false;
        }

        return true;
    }


    public void showAddress(double lat, double lng) {

        Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());//we pass Locale to ensure that the resulting address is localized to the user's geographic region

        List<Address> addresses = null;
        try {
            addresses = geocoder.getFromLocation(lat,lng,1);
            if(addresses != null || addresses.size() != 0){
                Address address = addresses.get(0);
                ArrayList<String> addressFragments = new ArrayList<String>();

                // Fetch the address lines using getAddressLine,
                // join them, and send them to the thread.
                for(int i = 0; i < address.getMaxAddressLineIndex(); i++) {
                    addressFragments.add(address.getAddressLine(i));
                    System.err.println("item" + i + ": " + addressFragments);
                }

                //line.separator works the same as \n
              txtAddress.setText(TextUtils.join(System.getProperty("line.separator"),
                      addressFragments));

            }

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


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}