dependencies {
implementation 'com.google.android.gms:play-services-tasks:17.2.0'
}
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.android.gms.tasks.TaskCompletionSource;
import com.google.android.gms.tasks.Tasks;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.location.Location;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
public class MainActivity extends Activity {
private static final int PERMISSION_REQUEST_CODE = 1;
@Override
protected void onStart() {
super.onStart();
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,
new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
PERMISSION_REQUEST_CODE);
} else {
getLocation();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == PERMISSION_REQUEST_CODE) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
getLocation();
}
}
}
private void getLocation() {
Task<Location> task = getLastKnownLocation();
task.addOnSuccessListener(new OnSuccessListener<Location>() {
@Override
public void onSuccess(Location location) {
if (location != null) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
}
}
});
}
private Task<Location> getLastKnownLocation() {
final TaskCompletionSource<Location> source = new TaskCompletionSource<>();
Task<Location> task = source.getTask();
// ...
return task;
}
}
