lnreader/android/app/src/main/java/com/rajarsheechatterjee/LNReader/FullScreenModule.java

// FullScreenModule.java

package com.rajarsheechatterjee.LNReader;

import android.os.Build;
import android.view.View;
import android.view.WindowManager;
import android.app.Activity;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.UiThreadUtil;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;


public class FullScreenModule extends ReactContextBaseJavaModule {
    @Override
    public String getName() {
        return "FullScreen";
    }

    @ReactMethod
    public void enable() {
        UiThreadUtil.runOnUiThread(
            new Runnable() {
                @Override
                public void run() {
                    getCurrentActivity().getWindow().getDecorView().setSystemUiVisibility(
                        View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
                        View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
                        View.SYSTEM_UI_FLAG_FULLSCREEN |
                        View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
                        View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
                    );
                }
            }
        );

    }

    @ReactMethod
    public void disable() {
        UiThreadUtil.runOnUiThread(
            new Runnable() {
                @Override
                public void run() {
                    getCurrentActivity().getWindow().getDecorView().setSystemUiVisibility(
                        View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
                        View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
                        View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    );
                }
            }
        );

    }

    FullScreenModule(ReactApplicationContext reactContext) {
        super(reactContext);
    }
}