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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> 
347
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..."); } }); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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