Android Code - Marshmallow Asking Permission

Pada onCreate

cek versi android

int currentapiVersion = android.os.Build.VERSION.SDK_INT;


if (currentapiVersion >= 23) {
    // Do something for 14 and above versions    cek();

} else {

    // do something for phones running an SDK before 14
}

Tambahkan function berikut

private static final int PERMISSION_REQUEST_CODE = 1;

public void cek(){
        if (checkPermission()) {

//            Snackbar.make(getCurrentFocus(),"Permission already granted.",Snackbar.LENGTH_LONG).show();
        } else {

//            Snackbar.make(getCurrentFocus(),"Please request permission.",Snackbar.LENGTH_LONG).show();        }

        if (!checkPermission()) {

            requestPermission();

        } else {

            Snackbar.make(getCurrentFocus(),"Permission already granted.",Snackbar.LENGTH_LONG).show();

        }

    }

    private boolean checkPermission(){
        int result = ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (result == PackageManager.PERMISSION_GRANTED){

            return true;

        } else {

            return false;

        }
    }

    private void requestPermission(){

        if (ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.WRITE_EXTERNAL_STORAGE)){

            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(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},PERMISSION_REQUEST_CODE);
        }
    }

    @Override    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case PERMISSION_REQUEST_CODE:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

//                    Snackbar.make(getCurrentFocus(),"Permission Granted, Now you can access location data.",Snackbar.LENGTH_LONG).show();
                } else {

//                    Snackbar.make(getCurrentFocus(),"Permission Denied, You cannot access location data.", Snackbar.LENGTH_LONG).show();
                }
                break;
        }
    }