add keyguard to secure camera

package net.sourceforge.opencamera;

import static android.content.Context.KEYGUARD_SERVICE;

import android.app.Activity;

import android.app.KeyguardManager;

import android.os.Build;

public class KeyguardUtils {

    public static void requireKeyguard(Activity activity, Runnable callback) {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            KeyguardManager keyguardManager = (KeyguardManager) activity.getSystemService(KEYGUARD_SERVICE);

            if (keyguardManager == null || !keyguardManager.isKeyguardLocked()) {

                callback.run();

                return;

            }

            keyguardManager.requestDismissKeyguard(activity, new KeyguardManager.KeyguardDismissCallback() {

                @Override

                public void onDismissSucceeded() {

                    callback.run();

                }

            });

        } else {

            callback.run();

        }

    }

}

    public void clickedSettings(View view) {

        if( MyDebug.LOG )

            Log.d(TAG, "clickedSettings");

        openSettings();

        KeyguardUtils.requireKeyguard(this, this::openSettings);

    }

    public boolean popupIsOpen() {