Using images for multiple resolutions

I was wondering if there is a way for using one set of images for all the resolutions. I have an application, and I want to port it on all the android resolutions but I don't want to store 3 sets of images, for every resolution category. What would be the best practice to use as less images as possible.

Th开发者_Go百科ank you!

Sure, you can provide only one set of images, in the base drawable directory, and Android will automatically resize as required.

This may result in aliasing and images that are not as clear as would be possible if you were to provide images sized properly.

You probably mean density, not resolution (in Android, applications do not work directly with resolution).

Actually, you don't need to support all 3 densities. Quote from developer.android.com:

This pre-scaling mechanism works independently of the source. For instance, an application targeted for a high-density screen may have bitmaps only in the res/drawable-hdpi/ directory. If one of the bitmaps is a 240x240 icon and is loaded on a medium-density screen, the resulting bitmap will measure 160x160.

I've done simple test: removed ldpi and mdpi density images, launched my app on mdpi skin and it scaled hdpi images nicely. It's not the best practice, but android's prescaling does its part as described.

Please read this for more details.

I wrote a tool which makes this all a lot easier to manage. Although the images are stored in separate directories - the tool shows all resolutions together, and lets you auto-scale from one to another.

you can get it here: http://hobbyistsoftware.com/AndroidImageViewer