Image size

I ́m building an app for both android an ios (smartphones) but my problem is the screen size. I use 100% for my images and it works great in iOS and in an android "moto g" with kitkat 4.4. But when I try it out on an android 2.3 and 4.1 the images get streched.
Do you recomend only making it for android 4.4 or how can I format my images?

Thnx a lot
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