Getting WebView Content height once its loaded Android

Question

I'm trying to apply expand collapse feature on Webview Based on its Content height but i'm always getting wrong value Here is my code

public class MesuredHeightWebView extends WebView {
    public MesuredHeightWebView(Context context) {
        super(context);
    }

    public MesuredHeightWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MesuredHeightWebView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }



    @Override
    public void invalidate() {
        super.invalidate();

        if (getContentHeight() > 0) {
            // WebView has displayed some content and is scrollable.
            if(listener!=null)
                listener.updateContentHeight(getContentHeight());
        }
    }



    WebViewContentHeight listener;

    public void setChangeContentListener(WebViewContentHeight listener) {
        this.listener = listener;
    }
}

and then in the fragment i tried to get the content height

 webView.setWebChromeClient(new WebChromeClient(){
        @Override
        public void onProgressChanged(WebView view, int newProgress) {

            super.onProgressChanged(view, newProgress);
            if(newProgress==100)
            {
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        webView.setChangeContentListener(new WebViewContentHeight() {
                            @Override
                            public void updateContentHeight(int height) {

                                if(height>0 && getActivity()!=null) {

                                    System.out.println("the height2 is" + height + " " + Utils.convertPixelsToDp(height, getActivity()));
                                    final int text_height = height;

but my problem is that i'm always getting wrong result Thanks

Can you explain why ContentListener must be within a runnable? Can't we get an accurate value if we simply set the listener without it? — Teffi, Sep 21 '17 at 08:04

score 18 · Answer 1 · answered Mar 30 '16 at 09:19

18

Use the following methods instead of getContentHeight() method:

computeHorizontalScrollRange(); -> for width 
computeVerticalScrollRange(); -> for height

these two methods will return the entire scrollable width/height rather than the actual widht/height of the webview on screen

answered Mar 30 '16 at 09:19

eyadMhanna

2,412
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3

Thanks Man, It Works like a Charm – Antwan Mar 30 '16 at 09:20
Thanks a lot, great answer! – dees91 Jan 13 '17 at 16:19
Using it with combination of onScrolledSchanged() gives you more efficient way to handle top, bottom. – Abhishek Aug 05 '17 at 19:07
1

these methods are for scrollview, the question is posed for webview. I'm in a situation where I need just the webview height, not the whole scroll view – Siavash Oct 04 '18 at 17:39
@Siavash the vertical scrollrange is actually the height of the webview – eyadMhanna Oct 05 '18 at 18:36
can't find these methods? Howto use them ? no such methods for webview. – mcfly soft May 17 '19 at 11:40

Getting WebView Content height once its loaded Android

1 Answers1

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