android multitouch image zooming?

Question

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 versi

Answer 1

I have a working implementation for 2.1+

WebView solution caused problems for me on 4.0.x (lot's of weird white spaces appearing)

https://github.com/jasonpolites/gesture-imageview

Might be useful for someone...

Answer 2

Have you tried using the intent "android.intent.action.VIEW" and letting the phone's built in image viewer display your image? It will probably use multi-touch controls if the phone supports it.

http://developer.android.com/reference/android/content/Intent.html#ACTION_VIEW

Answer 3

Regarding gesture-imageview lib: https://github.com/jasonpolites/gesture-imageview

it's in fact useful, but unfortunatelly it has some bugs, like: https://github.com/jasonpolites/gesture-imageview/issues/37

Anyway, good lib to try. It solved my usecase.

Answer 4

There is the possibility to use a webview to display a local file. The Webview has integrated multitouch zooming. Have a look at my question regarding this topic.

Answer 5

A recent post on the Android Developers Blog includes an example that does exactly what you ask. Unfortunately, it relies upon ScaleGestureDetecter which makes its first appearance in Froyo.