android - How to combine two opaque bitmaps into one with alpha channel? -

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i have png file transparency i'm using opengl texture. load in bitmap bitmapfactory.decoderesource, upload gpu.

the png file quite big , in order cut down on apk size, i'm trying use 2 jpgs instead--one rgb data, , other alpha channel (grayscale).

how combine 2 jpgs in 1 bitmap object alpha channel? tried loading alpha channel bitmap.config.alpha_8, drawing them on top of each other using canvas no luck far.

have @ kevin dion's answer this related question. explains how combine 4 separate images (r, g, b , channels) should able adapt work 2 images.


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