Requesting Permissions of Manifest.permission.ACCESS_FINE_LOCATION at Run Time

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Refer to last example of "Get my Last Known Location, by calling LocationServices.FusedLocationApi.getLastLocation()" in Android Studio, you will be prompted with "code should explicitly check to see if permission is available (with 'checkPermission') or explicitly handle a potential 'SecurityException'" on the code "LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient)".


Last example handle 'SecurityException' with try/catch. This example show another approach to check if permission is available with 'checkPermission', then call ActivityCompat.requestPermissions() if need, and handle the user answer in onRequestPermissionsResult().

reference: Android Developers - Requesting Permissions at Run Time




notice for sending location to Android Emulator: I have to open another app, Google Maps, to monitor location, otherwise my example cannot get the updated location.

Edit MainActivity.java from last post.
package com.blogspot.android_er.androidgetlastlocation;

import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
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.location.LocationServices;

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

Button btnGetLastLocation;
TextView textLastLocation;

GoogleApiClient mGoogleApiClient;
Location mLastLocation;

static final int MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnGetLastLocation = (Button) findViewById(R.id.getlastlocation);
btnGetLastLocation.setOnClickListener(btnGetLastLocationOnClickListener);
textLastLocation = (TextView) findViewById(R.id.lastlocation);

// Create an instance of GoogleAPIClient.
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
}

View.OnClickListener btnGetLastLocationOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {

if (mGoogleApiClient != null) {
if (mGoogleApiClient.isConnected()) {
getMyLocation();
} else {
Toast.makeText(MainActivity.this,
"!mGoogleApiClient.isConnected()", Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(MainActivity.this,
"mGoogleApiClient == null", Toast.LENGTH_LONG).show();
}
}
};

/*
// Handle 'SecurityException' with try/catch
private void getMyLocation(){
try{
//code should explicitly check to see if permission is available
//(with 'checkPermission') or explicitly handle a potential 'SecurityException'
//
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
textLastLocation.setText(
String.valueOf(mLastLocation.getLatitude()) + "\n"
+ String.valueOf(mLastLocation.getLongitude()));
Toast.makeText(MainActivity.this,
String.valueOf(mLastLocation.getLatitude()) + "\n"
+ String.valueOf(mLastLocation.getLongitude()),
Toast.LENGTH_LONG).show();
}else{
Toast.makeText(MainActivity.this,
"mLastLocation == null",
Toast.LENGTH_LONG).show();
}
} catch (SecurityException e){
Toast.makeText(MainActivity.this,
"SecurityException:\n" + e.toString(),
Toast.LENGTH_LONG).show();
}
}
*/


//------------------------------------------------------------------------------
//ref: Requesting Permissions at Run Time
//http://developer.android.com/training/permissions/requesting.html
//------------------------------------------------------------------------------
private void getMyLocation() {
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.


//------------------------------------------------------------------------------
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);

return;
}
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
textLastLocation.setText(
String.valueOf(mLastLocation.getLatitude()) + "\n"
+ String.valueOf(mLastLocation.getLongitude()));
Toast.makeText(MainActivity.this,
String.valueOf(mLastLocation.getLatitude()) + "\n"
+ String.valueOf(mLastLocation.getLongitude()),
Toast.LENGTH_LONG).show();
}else{
Toast.makeText(MainActivity.this,
"mLastLocation == null",
Toast.LENGTH_LONG).show();
}
}


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

switch (requestCode) {
case MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity.this,
"permission was granted, :)",
Toast.LENGTH_LONG).show();
getMyLocation();

} else {
Toast.makeText(MainActivity.this,
"permission denied, ...:(",
Toast.LENGTH_LONG).show();
}
return;
}

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


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

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

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

@Override
public void onConnectionSuspended(int i) {
Toast.makeText(MainActivity.this,
"onConnectionSuspended: " + String.valueOf(i),
Toast.LENGTH_LONG).show();
}

@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Toast.makeText(MainActivity.this,
"onConnectionFailed: \n" + connectionResult.toString(),
Toast.LENGTH_LONG).show();
}
}


Related:
Request Location Updates with LocationListener.onLocationChanged()

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