display huge Images in Android

Question

I'm intending to display very large Images in Android.

My first solution - to supply them as pdf - fails because not every handheld got a pdf-viewer preinstalled, and I don't want to require the users to install one.

So I have a png now (width = 3998px height=2827px) that I want to display. I downloaded this image to test how it would be displayed the gallery. It was quite painful. It seems that the galery renders this picture only once, and if I Zoom in, I cannot read the text at all.

So I wrote a testActivity which simply has an ImageView nested in a LinearLayout. I put the image into the drawable and set it as ImageView's image-source. Unforunately the app crashes immediatly, due to an "

 ERROR/AndroidRuntime(8906): Caused by: java.lang.OutOfMemoryError: bitmap size exceeds VM budget"  

I didn't expect that ONE single Image can be too large forVM's memory. I played a little bit around, set ImageViews size to 3998 & 2827px , put the Image to sdCard and read it manually with a fileInputStream.
To my big surprise it now shows my image, but if I turn my Nexus S horizontal I get the same OutOfMemoryError as before.

Can somewone point me the main difference between recieving a Bitmap through a FileInputStream or to set it as ImageView's source.

Also I'm not able to scroll comfortable with two parent scrollViews

I searching for a simple solution to display ONE large image at a time with the ability to scroll horizontal and vertical while able to zoom in and out.

here is a sample of the image I want to display

Answer 1

To handle scaling etc and using full resolution, You can use MapView of OSM (open street map) and provide it with your tiles (instead of the map). Check this: http://www.haakseth.com/?p=30