How to Hide ActionBar/Toolbar While Scrolling Down in Webview

Question

In Google chrome and play store. the app can hide the actionbar while scrolling and allows the user to Browse conveniently. Please Help me to do like this.

I\'ve use

Answer 1

Well I have implemented by CustomWebView and GestureDetector:

CustomWebView.java:

public class CustomWebView extends WebView {
    private GestureDetector gestureDetector;
    public CustomWebView(Context context) {
        super(context);
    }
    public CustomWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public CustomWebView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }
    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        return gestureDetector.onTouchEvent(ev) || super.onTouchEvent(ev);
    }

    public void setGestureDetector(GestureDetector gestureDetector) {
        this.gestureDetector = gestureDetector;
    }
}

web_fragment.xml:

CustomeGestureDetector clss for Gesture Detection (I have added in Fragment):

private class CustomeGestureDetector extends GestureDetector.SimpleOnGestureListener {
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            if(e1 == null || e2 == null) return false;
            if(e1.getPointerCount() > 1 || e2.getPointerCount() > 1) return false;
            else {
                try {
                    if(e1.getY() - e2.getY() > 20 ) {
                            // Hide Actionbar
                        getSupportActionBar().hide();
                        customWebView.invalidate();
                       return false;
                    }
                    else if (e2.getY() - e1.getY() > 20 ) {
                            // Show Actionbar
                        getSupportActionBar().show();
                        customWebView.invalidate();
                       return false;
                    }

                } catch (Exception e) {
                    customWebView.invalidate();
                }
                return false;
            }


        }
    }

WebFragment.java:

private CustomWebView customWebView;

customWebView= (CustomWebView) view.findViewById(R.id.customWebView);

customWebView.setGestureDetector(new GestureDetector(new CustomeGestureDetector()));

It works fine for me, hope it would help you.