Is it possible to determine the type of png compression on Android bitmaps?

Question

I know there are different types of png compression formats (using color palette for example). Is it possible to (programatically) determine the type I want to use when compressing a Bitmap in Android?

If the answer is no, can anyone suggest a method for doing so? Thanks

Answer 1

In Android there's no client API to specify that, because Bitmap.compress() calls a native method which doesn't accept such a parameter.

However you can use libpng (which BTW is what I think Android uses in its native implementation) and it certainly allows the fine-grained control you need.

But I really don't think that saving a bunch of KBytes in a GB-sized drive is worth this effort.

Answer 2

You can also use PNGJ, it allows full control over the writing parameters.

Answer 3

Eventually I had to make changes to the Android's skia library, since I didn't want to add any Java code (I need to make png compressions fast). If anyone needs such a solution, I uploaded mine to:
https://github.com/androidcompile/Android_external_skia_pngCompression