Android Studio Check And Request Permission

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.fgonga.stock">
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-feature android:name="android.hardware.camera"/>
    <uses-feature android:name="android.hardware.camera.autofocus"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:networkSecurityConfig="@xml/network_security_config"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Stock">
        <activity android:name="com.fgonga.stock.BuscarViaQr" />
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/Theme.Stock.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity.java

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        permission();
    }

    public void  permission(){
        PermissionUtil.checkAndRequestPermission(getApplicationContext(),this);
    }

PermissionUtil.java

package com.fgonga.stock.uteis;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import static android.Manifest.permission.CAMERA;
public class PermissionUtil {
    private static final int REQUEST_CAMERA = 1;
    public static boolean checkPermission(Context applicationContext)
    {
        int currentApiVersion = Build.VERSION.SDK_INT;
        if(currentApiVersion >=  Build.VERSION_CODES.M)
        {
            if (ContextCompat.checkSelfPermission(applicationContext, CAMERA) == PackageManager.PERMISSION_GRANTED){
                return true;
            }
            return false;
        }
        return true;
    }

    public static void checkAndRequestPermission(Context applicationContext, Activity activity){
        if (!checkPermission(applicationContext)) {
            requestPermission(activity);
        }
    }
    public static void requestPermission(Activity activity){
        ActivityCompat.requestPermissions(activity, new String[]{CAMERA}, REQUEST_CAMERA);
    }

}