PRACTICAL 31
Develop a program to display user’s current location:
Xml code
<?xml version="1.0" encoding="utf-8"?> import com.google.android.gms.location.LocationRequest;
<LinearLayout import com.google.android.gms.location.LocationResult;
xmlns:android="http://schemas.android.com/apk/res/android" import com.google.android.gms.location.LocationServices;
android:layout_width="match_parent" import com.google.android.gms.tasks.OnCompleteListener;
android:layout_height="match_parent" import com.google.android.gms.tasks.Task;
android:background="#4caf50" public class MainActivity extends AppCompatActivity {
android:gravity="center" // initializing
android:orientation="vertical"> // FusedLocationProviderClient
<TextView // object
android:layout_width="wrap_content" FusedLocationProviderClient mFusedLocationClient;
android:layout_height="wrap_content" // Initializing other items
android:fontFamily="sans-serif-black" // from layout file
android:text="Latitude:" /> TextView latitudeTextView, longitTextView;
<TextView int PERMISSION_ID = 44;
android:id="@+id/latTextView" @Override
android:layout_width="wrap_content" protected void onCreate(Bundle savedInstanceState) {
android:layout_height="wrap_content" super.onCreate(savedInstanceState);
android:text="Latitude will be here! " setContentView(R.layout.activity_main);
android:textColor="#f5f5f5" /> latitudeTextView = findViewById(R.id.latTextView);
<TextView longitTextView = findViewById(R.id.lonTextView);
android:layout_width="wrap_content" mFusedLocationClient =
android:layout_height="wrap_content" LocationServices.getFusedLocationProviderClient(this);
android:fontFamily="sans-serif-black" // method to get the location
android:text="Longitude:" /> getLastLocation();
<TextView }
android:id="@+id/lonTextView" @SuppressLint("MissingPermission")
android:layout_width="wrap_content" private void getLastLocation() {
android:layout_height="wrap_content" // check if permissions are given
android:text="Longitude will be here! " if (checkPermissions()) {
android:textColor="#f5f5f5" /> // check if location is enabled
</LinearLayout> if (isLocationEnabled()) {
// getting last
// location from
// FusedLocationClient
Java code // object
package com.example.prac31;
mFusedLocationClient.getLastLocation().addOnCompleteListener(
import android.Manifest;
new OnCompleteListener<Location>() {
import android.annotation.SuppressLint;
@Override
import android.content.Context;
public void onComplete(@NonNull Task<Location>
import android.content.Intent;
task) {
import android.content.pm.PackageManager;
Location location = task.getResult();
import android.location.Location;
if (location == null) {
import android.location.LocationManager;
requestNewLocationData();
import android.os.Bundle;
} else {
import android.os.Looper;
latitudeTextView.setText(location.getLatitude() +
import android.provider.Settings;
"");
import android.widget.TextView;
longitTextView.setText(location.getLongitude() +
import android.widget.Toast;
"");
import androidx.annotation.NonNull;
}
import androidx.appcompat.app.AppCompatActivity;
}
import androidx.core.app.ActivityCompat;
});
importcom.google.android.gms.location.FusedLocationProviderClient;
} else {
import com.google.android.gms.location.LocationCallback;
PRACTICAL 31
Toast.makeText(this, "Please turn on" + " your // If we want background location
location...", Toast.LENGTH_LONG).show(); // on Android 10.0 and higher,
Intent intent = new // use:
Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); // ActivityCompat.checkSelfPermission(this,
startActivity(intent); Manifest.permission.ACCESS_BACKGROUND_LOCATION) ==
} PackageManager.PERMISSION_GRANTED
} else { }
// if permissions aren't available,
// request for permissions // method to request for permissions
requestPermissions(); private void requestPermissions() {
} ActivityCompat.requestPermissions(this, new String[]{
} Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION},
@SuppressLint("MissingPermission") PERMISSION_ID);
private void requestNewLocationData() { }
// Initializing LocationRequest // method to check
// object with appropriate methods // if location is enabled
LocationRequest mLocationRequest = new LocationRequest(); private boolean isLocationEnabled() {
LocationManager locationManager = (LocationManager)
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_A getSystemService(Context.LOCATION_SERVICE);
CCURACY); return
mLocationRequest.setInterval(5); locationManager.isProviderEnabled(LocationManager.GPS_PROVI
mLocationRequest.setFastestInterval(0); DER) ||
mLocationRequest.setNumUpdates(1); locationManager.isProviderEnabled(LocationManager.NETWORK_
PROVIDER);
// setting LocationRequest }
// on FusedLocationClient
mFusedLocationClient = // If everything is alright then
LocationServices.getFusedLocationProviderClient(this); @Override
public void
mFusedLocationClient.requestLocationUpdates(mLocationReques onRequestPermissionsResult(int requestCode, @NonNull
t, mLocationCallback, Looper.myLooper()); String[] permissions, @NonNull int[] grantResults) {
} super.onRequestPermissionsResult(requestCode,
permissions, grantResults);
private LocationCallback mLocationCallback = new
LocationCallback() { if (requestCode == PERMISSION_ID) {
if (grantResults.length > 0 && grantResults[0] ==
@Override PackageManager.PERMISSION_GRANTED) {
public void onLocationResult(LocationResult locationResult) { getLastLocation();
Location mLastLocation = locationResult.getLastLocation(); }
latitudeTextView.setText("Latitude: " + }
mLastLocation.getLatitude() + ""); }
longitTextView.setText("Longitude: " +
mLastLocation.getLongitude() + ""); @Override
} public void onResume() {
}; super.onResume();
if (checkPermissions()) {
// method to check for permissions getLastLocation();
private boolean checkPermissions() { }
return ActivityCompat.checkSelfPermission(this, }
Manifest.permission.ACCESS_COARSE_LOCATION) == }
PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) ==
PackageManager.PERMISSION_GRANTED;
PRACTICAL 31
Manifest code Outputs
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.prac31">
<uses-permission
android:name="android.permission.ACCESS_COARSE_LOCATION"
/>
<uses-permission
android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission
android:name="android.permission.ACCESS_BACKGROUND_LOCA
TION" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.Prac31">
<activity
android:name=".MainActivity"
android:exported="true"
tools:ignore="IntentFilterExportedReceiver">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
