What Does Android Do Automatically To Support Multiple Screen-Sizes?

Once the build declares that it supports the various screen-sizes using the "supports-screens" settings in the manifest, the code will do the following automatically:

• Scales images by automatically compensating for the screen-density
• Also, getIntrinsicWidth and getIntrinsicHeight on a Drawable returns the dimensions of the image post-scaling, so pixel measurements based on what these return will still work.
• Automatically scales dip settings in layout XML files.

Hence, the remaining needs to be done for rendering done in code:

• All pixel calculations to compensate for screen density.
• Pixel positions specified in draw calls to be compensated for screen density.