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Editorial Team
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Asked: 2026-06-18T14:34:14+00:00

How to implement the Scroll Listener for WebView in Android i tried this but

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How to implement the Scroll Listener for WebView in Android

i tried this but its not calling my Log.i on scrolling the webview.

package com.example.webview.full.width;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.webkit.WebView;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;

public class scorllableWebview extends WebView implements OnScrollListener {


Context ctx;
AttributeSet atrs;

public scorllableWebview(Context context) {
    super(context);

    ctx = context;
}

public scorllableWebview(Context context, AttributeSet atters){
    super(context, atters);

    ctx = context;
    atrs = atters;
}

@Override
public void onScroll(AbsListView view, int firstVisibleItem,
        int visibleItemCount, int totalItemCount) {

    Log.i("onScroll", "Called");
}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {


    Log.i("onScrollStateChanged", "Called");

}
}

Here is my MainActivity.java

package com.example.webview.full.width;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.view.Menu;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class MainActivity extends Activity {

ProgressDialog progressDialog;
scorllableWebview wv;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    wv = (scorllableWebview) findViewById(R.id.scorllableWebview);

    wv.getSettings().setJavaScriptEnabled(true);

    wv.getSettings().setBuiltInZoomControls(true);
    wv.getSettings().supportZoom();

    progressDialog = ProgressDialog.show(MainActivity.this,
            "Loading Book...!", "Please Wait");
    progressDialog.setCancelable(true);

    String htnlString = "<!DOCTYPE html><html><body style = \"text-align:center\"><script type=\"text/javascript\">for(a=1;a<=10;a++)document.write('<img style=\"border-style:dotted;border-width:10px;border-color:black;\"src=\"http://myURL.com/books_snaps/EN567/'+a+'.jpg\" alt=\"Page Not Found\"/>');</script></body></html>";
    // width=\"100%\"
    wv.setWebViewClient(new WebViewClient() {

        @Override
        public void onPageFinished(WebView view, String url) {
            progressDialog.dismiss();
            Toast.makeText(MainActivity.this, "Completed",
                    Toast.LENGTH_SHORT).show();
            wv.pageUp(true);
            super.onPageFinished(view, url);
        }

    });

    wv.loadDataWithBaseURL(null, htnlString, "text/html", "UTF-8", null);

}
   }

and here is my XML file.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<com.example.webview.full.width.scorllableWebview
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/scorllableWebview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

</RelativeLayout>
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1 Answer

  1. Editorial Team

    Something like:

    public class ObservableWebView extends WebView
{
    private OnScrollChangedCallback mOnScrollChangedCallback;

    public ObservableWebView(final Context context)
    {
        super(context);
    }

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

    public ObservableWebView(final Context context, final AttributeSet attrs, final int defStyle)
    {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onScrollChanged(final int l, final int t, final int oldl, final int oldt)
    {
        super.onScrollChanged(l, t, oldl, oldt);
        if(mOnScrollChangedCallback != null) mOnScrollChangedCallback.onScroll(l, t, oldl, oldt);
    }

    public OnScrollChangedCallback getOnScrollChangedCallback()
    {
        return mOnScrollChangedCallback;
    }

    public void setOnScrollChangedCallback(final OnScrollChangedCallback onScrollChangedCallback)
    {
        mOnScrollChangedCallback = onScrollChangedCallback;
    }

    /**
     * Impliment in the activity/fragment/view that you want to listen to the webview
     */
    public static interface OnScrollChangedCallback
    {
        public void onScroll(int l, int t, int oldl, int oldt);
    }
}

    Should work, this is untested but this works for almost every other view in Android.

    You would implement like:

    wv = (ObservableWebView) findViewById(R.id.scorllableWebview);
wv.setOnScrollChangedCallback(new OnScrollChangedCallback(){
    public void onScroll(int l, int t, int oldl, int oldt){
        if(t> oldt){
            //Do stuff
            System.out.println("Swipe UP");
            //Do stuff
        }
        else if(t< oldt){
            System.out.println("Swipe Down");
        }
        Log.d(TAG,"We Scrolled etc...");
    }
});
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