Permission issues for location in android Marshmallow applicaton

Question

I am learning to develop an android application for getting device location following Google developers forum: @http://developer.android.com/training/location/retrieve-curre

Answer 1

Straight forward solution/example for your question:

package com.my.packagename;

import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

private static final int PERMISSION_REQUEST_CODE_LOCATION = 1;

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

    if (checkPermission(Manifest.permission.ACCESS_FINE_LOCATION,getApplicationContext(),CopyOfMap.this)) {
        fetchLocationData();
    }
    else
    {
        requestPermission(Manifest.permission.ACCESS_FINE_LOCATION,PERMISSION_REQUEST_CODE_LOCATION,getApplicationContext(),CopyOfMap.this);
    }
}

public static void requestPermission(String strPermission,int perCode,Context _c,Activity _a){

    if (ActivityCompat.shouldShowRequestPermissionRationale(_a,strPermission)){
                Toast.makeText(getApplicationContext(),"GPS permission allows us to access location data. Please allow in App Settings for additional functionality.",Toast.LENGTH_LONG).show();
            } else {

                ActivityCompat.requestPermissions(_a,new String[]{strPermission},perCode);
            }
    }

public static boolean checkPermission(String strPermission,Context _c,Activity _a){
        int result = ContextCompat.checkSelfPermission(_c, strPermission);
        if (result == PackageManager.PERMISSION_GRANTED){

            return true;

        } else {

            return false;

        }
    }

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

        case PERMISSION_REQUEST_CODE_LOCATION:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                fetchLocationData();

            } else {

                Toast.makeText(getApplicationContext(),"Permission Denied, You cannot access location data.",Toast.LENGTH_LONG).show();

            }
            break;

    }
}


    private void fetchLocationData()
    {
    //code to use the granted permission (location)
    }
}

Here i've made the requestPermission() and checkPermission() method as public static because i can reuse them for other permission requests like phone call, write storage, and others. Hope this will help some one. :-)