带进度条的WebView

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public class ProgressWebView extends WebView {

	private ProgressBar progressbar;
	
	public ProgressWebView(Context context, AttributeSet attrs) {
		super(context, attrs);
		progressbar = new ProgressBar(context, null, android.R.attr.progressBarStyleHorizontal);
        progressbar.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, UIUtils.dip2px(context, 3), 0, 0));
        addView(progressbar);
//      setWebViewClient(new WebViewClient(){});
        setWebChromeClient(new WebChromeClient());
	}

	public class WebChromeClient extends android.webkit.WebChromeClient {
        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            if (newProgress == 100) {
                progressbar.setVisibility(GONE);
            } else {
                if (progressbar.getVisibility() == GONE)
                    progressbar.setVisibility(VISIBLE);
                progressbar.setProgress(newProgress);
            }
            super.onProgressChanged(view, newProgress);
        }

    }

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

@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK && mWebview.canGoBack()) {
			mWebview.goBack();
			return true;
		}
		return super.onKeyDown(keyCode, event);
	}