Как я могу переместить код "Manifest.permission.WRITE_EXTERNAL_STORAGE" в OnCreate вместо кнопок?

Question

Я нашел этот код где-то в Inte rnet, и некоторые отредактировали его

import android.Manifest;
import android.content.pm.PackageManager;
//import android.support.annotation.NonNull;
//import android.support.v4.app.ActivityCompat;
//import android.support.v4.content.ContextCompat;
//import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

public class MainActivity extends AppCompatActivity {


    // Defining Buttons
    private Button storage, camera;

    // Defining Permission codes.
    // We can give any value
    // but unique for each permission.
    private static final int CAMERA_PERMISSION_CODE = 100;
    private static final int STORAGE_PERMISSION_CODE = 111;

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

        storage = findViewById(R.id.storage);
        camera = findViewById(R.id.camera);

        // Set Buttons on Click Listeners
        **storage.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v)
            {
                checkPermission(
                        Manifest.permission.WRITE_EXTERNAL_STORAGE,
                        STORAGE_PERMISSION_CODE);
            }
        });

        camera.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v)
            {
                checkPermission(Manifest.permission.CAMERA,
                        CAMERA_PERMISSION_CODE);
            } **
        });
    }

    // Function to check and request permission.
    public void checkPermission(String permission, int requestCode)
    {
        if (ContextCompat.checkSelfPermission(MainActivity.this, permission)
                == PackageManager.PERMISSION_DENIED) {

            // Requesting the permission
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[] { permission },
                    requestCode);
        }
        else {
            Toast.makeText(MainActivity.this,
                    "Permission already granted",
                    Toast.LENGTH_SHORT)
                    .show();
        }
    }

    // This function is called when the user accepts or decline the permission.
    // Request Code is used to check which permission called this function.
    // This request code is provided when the user is prompt for permission.

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

        if (requestCode == CAMERA_PERMISSION_CODE) {
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(MainActivity.this,
                        "Camera Permission Granted",
                        Toast.LENGTH_SHORT)
                        .show();
            }
            else {
                Toast.makeText(MainActivity.this,
                        "Camera Permission Denied",
                        Toast.LENGTH_SHORT)
                        .show();
            }
        }

        else if (requestCode == STORAGE_PERMISSION_CODE) {
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(MainActivity.this,
                        "Storage Permission Granted",
                        Toast.LENGTH_SHORT)
                        .show();
            }
            else {
                Toast.makeText(MainActivity.this,
                        "Storage Permission Denied",
                        Toast.LENGTH_SHORT)
                        .show();
            }
        }
    }
}

Но я хотел изменить его, чтобы проверять права (и запрашивал их, если они не были предоставлены) непосредственно наСоздать приложение, нет после того, как нажимать кнопки.

Manifest.permission.WRITE_EXTERNAL_STORAGE,
                STORAGE_PERMISSION_CODE);

Manifest.permission.WRITE_EXTERNAL_STORAGE,
                STORAGE_PERMISSION_CODE);

Для этих команд я удалил void onclick, и теперь они должны запустить Создать программу.

Мой код сейчас:

import android.Manifest;
import android.content.pm.PackageManager;
//import android.support.annotation.NonNull;
//import android.support.v4.app.ActivityCompat;
//import android.support.v4.content.ContextCompat;
//import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

public class MainActivity extends AppCompatActivity {


    // Defining Buttons
    private Button storage, camera;

    // Defining Permission codes.
    // We can give any value
    // but unique for each permission.
    private static final int CAMERA_PERMISSION_CODE = 100;
    private static final int STORAGE_PERMISSION_CODE = 111;

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

        storage = findViewById(R.id.storage);
        camera = findViewById(R.id.camera);

        // Set Buttons on Click Listeners

        Manifest.permission.WRITE_EXTERNAL_STORAGE,
                STORAGE_PERMISSION_CODE);

        Manifest.permission.WRITE_EXTERNAL_STORAGE,
                STORAGE_PERMISSION_CODE);

    }

    // Function to check and request permission.
    public void checkPermission(String permission, int requestCode)
    {
        if (ContextCompat.checkSelfPermission(MainActivity.this, permission)
                == PackageManager.PERMISSION_DENIED) {

            // Requesting the permission
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[] { permission },
                    requestCode);
        }
        else {
            Toast.makeText(MainActivity.this,
                    "Permission already granted",
                    Toast.LENGTH_SHORT)
                    .show();
        }
    }

    // This function is called when the user accepts or decline the permission.
    // Request Code is used to check which permission called this function.
    // This request code is provided when the user is prompt for permission.

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

        if (requestCode == CAMERA_PERMISSION_CODE) {
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(MainActivity.this,
                        "Camera Permission Granted",
                        Toast.LENGTH_SHORT)
                        .show();
            }
            else {
                Toast.makeText(MainActivity.this,
                        "Camera Permission Denied",
                        Toast.LENGTH_SHORT)
                        .show();
            }
        }

        else if (requestCode == STORAGE_PERMISSION_CODE) {
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(MainActivity.this,
                        "Storage Permission Granted",
                        Toast.LENGTH_SHORT)
                        .show();
            }
            else {
                Toast.makeText(MainActivity.this,
                        "Storage Permission Denied",
                        Toast.LENGTH_SHORT)
                        .show();
            }
        }
    }
}

Но это не так Я не знаю почему. Я должен нажать на кнопки, хотя я переместил эти команды в onCreate ...