Location Api Gist

MainActivity.java

package com.panchal.vivek.mapproject;

import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Geocoder;
import android.location.Location;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.os.ResultReceiver;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.tasks.OnSuccessListener;

public class MainActivity extends AppCompatActivity {
    private static final int REQUEST_CODE = 100;
    private TextView mLocationTextView;
    private FusedLocationProviderClient mFusedLocationClient;
    private static Location mCurrentLocation;
    private LocationCallback mLocationCallback;

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        switch (requestCode) {
            case REQUEST_CODE:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Toast.makeText(this, "Hurray Permission Granted",
                            Toast.LENGTH_SHORT).show();
                } else if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_DENIED) {
                    Toast.makeText(this, "Location permission not granted, " +
                                    "restart the app if you want the feature",
                            Toast.LENGTH_SHORT).show();
                }
        }
    }

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

        permissionCheck();

        mLocationTextView = findViewById(R.id.location_text);
        Button mBtnLocation = findViewById(R.id.btn_location);
        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
        buildLocationCallback();
        mBtnLocation.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                    startLocationUpdates();
                    getAddress();
            }
        });
    }

    private void permissionCheck() {
        if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_CODE);
        }
    }

    private void buildLocationCallback() {
        mLocationCallback = new LocationCallback() {
            @Override
            public void onLocationResult(LocationResult locationResult) {
                if (locationResult == null) {
                    return;
                }
                for (Location location : locationResult.getLocations()) {
                    mCurrentLocation.set(location);
                }
            }
        };
    }

    private LocationRequest buildLocationRequest() {
        LocationRequest mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(10000);
        mLocationRequest.setFastestInterval(5000);
        mLocationRequest.setSmallestDisplacement(10);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        return mLocationRequest;
    }

    private class LocationAddressResultReceiver extends ResultReceiver {
        @SuppressLint("RestrictedApi")
        LocationAddressResultReceiver(Handler handler) {
            super(handler);
        }

        @Override
        protected void onReceiveResult(int resultCode, Bundle resultData) {

            if (resultCode == 0) {
                //Last Location can be null for various reasons
                //for example the api is called first time
                //so retry till location is set
                //since intent service runs on background thread, it doesn't block main thread
                Log.d("Address", "Location null retrying");
                getAddress();
            }

            if (resultCode == 1) {
                Toast.makeText(MainActivity.this,
                        "Address not found, ",
                        Toast.LENGTH_SHORT).show();
            }

            String currentAdd = resultData.getString("address_result");
            mLocationTextView.setText(currentAdd);
        }
    }

    private void startLocationUpdates() {
        if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_CODE);
        } else {
            mFusedLocationClient.requestLocationUpdates(buildLocationRequest(), mLocationCallback, null);
        }
    }

    private void getAddress() {

        if (!Geocoder.isPresent()) {
            Toast.makeText(MainActivity.this,
                    "Can't find current address, ",
                    Toast.LENGTH_SHORT).show();
            return;
        }
        LocationAddressResultReceiver addressResultReceiver = new LocationAddressResultReceiver(new Handler());
        Intent intent = new Intent(this, GetAddressIntentService.class);
        intent.putExtra("add_receiver", addressResultReceiver);
        intent.putExtra("add_location", mCurrentLocation);
        startService(intent);
    }

}