NavigationBarAndroid.java

package com.yourapp.navbar;

import android.app.Activity;
import android.view.View;

import com.facebook.react.ReactActivity;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;

public class NavigationBarAndroid extends ReactContextBaseJavaModule {

    public NavigationBarAndroid(ReactApplicationContext reactContext) {
        super(reactContext);
    }

    @Override
    public String getName() {
        return "NavigationBarAndroid";
    }

    @ReactMethod
    public void hide() {
        Activity reactActivity = getCurrentActivity();
        if (reactActivity) {
            View decorView = reactActivity.getWindow().getDecorView();
            // Hide both the navigation bar and the status bar.
            // SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as
            // a general rule, you should design your app to hide the status bar whenever you
            // hide the navigation bar.
            int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN;
            decorView.setSystemUiVisibility(uiOptions);
        }
    }

}

NavigationBarAndroidPackage.java

package com.yourapp.navbar;

import com.facebook.react.ReactPackage;
import com.facebook.react.bridge.JavaScriptModule;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.uimanager.ViewManager;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class NavigationBarAndroidPackage implements ReactPackage {

    @Override
    public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
        List<NativeModule> modules = new ArrayList<>();

        modules.add(new NavigationBarAndroid(reactContext));

        return modules;
    }

    @Override
    public List<Class<? extends JavaScriptModule>> createJSModules() {
        return Collections.emptyList();
    }

    @Override
    public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
        return Collections.emptyList();
    }
}

You can also try this. (I'm use React Native Wix Navigation V2.)
https://gist.github.com/hto/7ed5ef629bd8bdf651c73f3680541ad5