Check M Permissions class. This class has to grow

CheckPermissions.java

import android.Manifest;
import android.app.Activity;
import android.app.Dialog;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;

public class CheckPermissions {

    public static final int REQUEST_CONTACTS = 1273;

    private final Activity activity;
    private final Dialog rationaleDialog;
    private OnGrantedContactPermission onGrantedContactPermission;

    public CheckPermissions(Activity activity, Dialog rationaleDialog) {
        this.activity = activity;
        this.rationaleDialog = rationaleDialog;
    }

    public void checkContactPermission() {
        if (ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
            if (onGrantedContactPermission != null) {
                onGrantedContactPermission.onGratedContactPermission(true);
            }
        } else {
            requestPhonePermission();
        }
    }

    private void requestPhonePermission() {
        if (ActivityCompat.shouldShowRequestPermissionRationale(activity, Manifest.permission.WRITE_CONTACTS)) {
            if (rationaleDialog != null) {
                rationaleDialog.show();
            }
        } else {
            doRequestPhonePermissions();
        }
    }

    private void doRequestPhonePermissions() {
        ActivityCompat.requestPermissions(activity, new String[] {Manifest.permission.WRITE_CONTACTS}, REQUEST_CONTACTS);
    }

    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        if (requestCode == CheckPermissions.REQUEST_CONTACTS) {
            if (verifyPermissions(grantResults)) {
                if (onGrantedContactPermission != null) {
                    onGrantedContactPermission.onGratedContactPermission(true);
                }
            } else {
                if (onGrantedContactPermission != null) {
                    onGrantedContactPermission.onGratedContactPermission(false);
                }
            }
        }
    }

    private boolean verifyPermissions(int[] grantResults) {
        if(grantResults.length < 1){
            return false;
        }

        for (int result : grantResults) {
            if (result != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }

    public interface OnGrantedContactPermission {
        void onGratedContactPermission(boolean isGranted);
    }

    public void setOnGrantedContactPermissionListener(OnGrantedContactPermission onGrantedContactPermission) {
        this.onGrantedContactPermission = onGrantedContactPermission;
    }
}