Is there a built in API for handling pinch-zoom functionality in Android

android multi-touch
krise picture krise · Apr 15, 2010 · Viewed 10.7k times · Source

I just wanted to know if there is some kind of class to use the multitouch features of android 2.1. Specifically I am trying to implement pinch-zoom and was wondering if I always have to measure the distance between two touch events and calculate the zoom level on my own?

Thanks, chris

Answer

Mirko N. picture Mirko N. · Apr 30, 2010

I'm trying to do the same thing, and as usual my first instinct was to look into the Android source code itself. The interesting bits seem to be in class ScaleGestureDetector, which is not public but its javadoc says

@hide Pending API approval

so hopefully it will become public at some point.

Update: ScaleGestureDetector is now part of the Android 2.2 API.

Related questions

enable/disable zoom in Android WebView

There are some methods in WebSettings related to zoom: WebSettings.setSupportZoom WebSettings.setBuiltInZoomControls I noticed they work differently on some devices. For example, on my Galaxy S pinch to zoom is enabled by default, but on LG P500 it is …

Read More
pointerIndex out of range Android multitouch

I have a touch event exception that is causing my game to crash on tablets (or more specifically, honeycomb)... My game works fine on my phone and I haven't heard of this happening to anyone that isn't running Android 3.0 or …

Read More
android multitouch image zooming?

I'm displaying an image on full screen now i want to zoom it in or out. Any one guide on how I can implement multi touch image zooming? I am using the 2.1 sdk version.

Read More