MainActivity.java

package com.lypeer.fcpermissions;

import android.Manifest;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import com.lypeer.fcpermission.FcPermissions;
import com.lypeer.fcpermission.impl.FcPermissionsCallbacks;

import java.util.List;

public class MainActivity extends AppCompatActivity implements FcPermissionsCallbacks {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.btn_request_camera).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                requestCameraPermission();
            }
        });
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        FcPermissions.onRequestPermissionsResult(requestCode , permissions , grantResults , this);
    }

    private void requestCameraPermission() {
        FcPermissions.requestPermissions(this , getString(R.string.prompt_request_camara) , FcPermissions.REQ_PER_CODE , Manifest.permission.CAMERA);
    }

    @Override
    public void onPermissionsGranted(int requestCode, List<String> perms) {
        Toast.makeText(this, R.string.prompt_already_get_permission, Toast.LENGTH_LONG).show();
    }

    @Override
    public void onPermissionsDenied(int requestCode, List<String> perms) {
        Toast.makeText(this, R.string.prompt_been_denied, Toast.LENGTH_LONG).show();
        FcPermissions.checkDeniedPermissionsNeverAskAgain(this,
                getString(R.string.prompt_we_need_camera),
                R.string.setting, R.string.cancel, null, perms);
    }
}