public ProgressWebView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    this.progressbar = new ProgressBar(context, null, 16842872);
    this.progressbar.setLayoutParams(new LayoutParams(-1, Util.dip2px(context, 3.0f), 0, 0));
    this.progressbar.setProgressDrawable(context.getResources().getDrawable(R.drawable.webview_loading_progress_style));
    addView(this.progressbar);
    setWebChromeClient(new WebChromeClient(this));
}
 

protected void onScrollChanged(int l, int t, int oldl, int oldt) {
    LayoutParams lp = (LayoutParams) this.progressbar.getLayoutParams();
    lp.x = l;
    lp.y = t;
    this.progressbar.setLayoutParams(lp);
    super.onScrollChanged(l, t, oldl, oldt);
}