Friday, March 13, 2015

How to combine transparent Bitmaps into one Bitmap in Android (JAVA)

This process is pretty straight forward. You create a Bitmap Array[] then you combine all the individual parts together via this function.

First you declare your type:

Bitmap[] parts = new Bitmap[2];

Then you assign each element in the array:

parts[0] = Bitmap.createScaledBitmap(icon1, 120, 120, false);
parts[1] = Bitmap.createScaledBitmap(icon2, 120, 120, false);

Then you stack them together using stackBitmaps(parts):

               finalIcon = stackBitmaps(parts);

Here is the function you need to use:

private static Bitmap stackBitmaps (Bitmap[] parts) {
Bitmap mutableBitmap = parts[0].copy(Bitmap.Config.ARGB_8888, true);
Canvas comboImage = new Canvas(mutableBitmap);
for (int i = 1; i < parts.length; i++)
comboImage.drawBitmap(parts[i], 0f, 0f, null);
return mutableBitmap;

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