Question

I’ve an android-app (Android SDK 10) with a WebView. On that WebView I have to use elements with a fixed position. Now I know, that there are Problems with fixed Elements, but with this Code in the HTML:

<meta name="viewport"
  content="width=100%; 
  initial-scale=1;
  maximum-scale=1;
  minimum-scale=1; 
  user-scalable=no;">

And this for the Webview:

WebView mWebView = (WebView) findViewById(R.id.webView1);
mWebView.getSettings().setBuiltInZoomControls(true);
mWebView.getSettings().setSupportZoom(true);
mWebView.setVerticalScrollBarEnabled(true);
mWebView.loadUrl("path/to.html");

I am able to zoom when using the zoomcontrolls. Multitouch- and pinchzoom distorts the page however.

Is there a possibility to disable pich- and multitouchzoom but keep the zoom-controlls working?

---

With the suggestions of Vikalp Patel I’ve come to this solution:

CustomWebView mWebView = (CustomWebView) findViewById(R.id.webView1);
mWebView.loadUrl("path/to.html");

CustomWebView.java

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.webkit.WebView;

public class CustomWebView extends WebView {

    /**
     * Constructor
     */
    public CustomWebView(Context context) {
        super(context);
    }

    /**
     * Constructor
     */
    public CustomWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    /*
     * (non-Javadoc)
     * 
     * @see android.webkit.WebView#onTouchEvent(android.view.MotionEvent)
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getPointerCount() > 1) {
            this.getSettings().setSupportZoom(false);
            this.getSettings().setBuiltInZoomControls(false);
        } else {
            this.getSettings().setSupportZoom(true);
            this.getSettings().setBuiltInZoomControls(true);
        }
        return super.onTouchEvent(event);
    }
}

Implementation in layout.xml

<package.path.CustomWebView
   ...
 />

Hope, that helps somebody.

Answer 1

I’ve looked at the source code for WebView and I concluded that there is no elegant way to accomplish what you are asking.

What I ended up doing was subclassing WebView and overriding OnTouchEvent

. In OnTouchEvent for ACTION_DOWN, I check how many pointers there are using MotionEvent.getPointerCount(). If there is more than one pointer, I call setSupportZoom(false), otherwise I call setSupportZoom(true). I then call the super.OnTouchEvent().

This will effectively disable zooming when scrolling (thus disabling the zoom controls) and enable zooming when the user is about to pinch zoom. Not a nice way of doing it, but it has worked well for me so far.

Note that getPointerCount() was introduced in 2.1 so you’ll have to do some extra stuff if you support 1.6.