immersive-module.java

public class ImmersiveModeModule extends ReactContextBaseJavaModule {

    public static final String TAG = "ImmersiveMode";

    private Handler uiHandler;
    private Runnable mRunnable;

    public ImmersiveModeModule(ReactApplicationContext reactContext) {
        super(reactContext);
        uiHandler = new Handler(reactContext.getMainLooper());
        mRunnable = new Runnable() {
            @Override
            public void run() {
                Activity activity = getCurrentActivity();
                if (activity != null) {
                    activity.getWindow().getDecorView().setSystemUiVisibility(
                            View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                                    | View.SYSTEM_UI_FLAG_FULLSCREEN
                                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
                }
            }
        };
    }

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

    @ReactMethod
    public void enter(Promise promise) {
        uiHandler.post(mRunnable);
        promise.resolve(null);
    }
}