Android network download picture is black at the transparent place

PNG can be ported to the network Graphics format, is also a bitmap file storage format for lossless compression. And JPG is our most common image format, images occupy less storage, but also sacrificed the image quality.

The biggest difference between the two is that it is lossy and lossless.

In the case where a transparent PNG image is loaded, the problem is black, typically this:

Server image is a non-destructive image of transparent png, we download to the local time to force it processing in the form of JPG, resulting in image quality damage.

JPG Pictures are not the concept of background transparency.

Network pictures should be saved to the local PNG format and uncompressed

Bitmap.compress (Bitmap.CompressFormat.PNG, MB, OS);

Android network download picture is black at the transparent place