Confused about scaling Bitmap with support for different resolutions in Android

Question

I am confused about how to write resolution-independent code for an Android game, and I'm looking for a few quick tips and tricks, as I'm never sure what to do with multiple versions of Android. Here is what I specifically want to do:

• I want to upload a PNG file of size 100x100 pixels to a Bitmap object.
• When the bitmap is loaded, I want it to scale so that when I draw it on the canvas, it covers the width of the screen.
• I want my application to run on API 1.5 (since 15% of people still use this http://developer.android.com/resources/dashboard/platform-versions.html ) and above.

Can someone explain what I would do in the above situation to get the results that I want?

What particularly bothers me is:

• How does API1.6 choose which folder (for example, -hdpi) to load the bitmap image and how does it decide what to scale it to?
• Does API 1.5 have some sort of auto-scaling feature? The width and height reported by the canvas seem to scale according to the density of the screen.

Answer 1

I think this page should help: http://developer.android.com/guide/practices/screens_support.html

1.5 does not scale, because all devices at the time of launching 1.5 were mdpi.

1.6 Android , res , .

, 100x100 res/drawable, hdpi, Android res/drawable-hdpi, , Android , res/drawable.