Bitmap color change while compressing to png

Question

I\'m currently working on a steganogrpahy android app as a class project. I\'ve created an object that will encode an image with in another image and return an encoded bitma

Answer 1

Ok, after many long wasted hours worrying about the thread and the algorithm I was using to encode the the bitmap the problem was a little simpler. While decoding the image file that was to be encoded with a message I was using options.inPreferredConfig = Config.ARGB_8888; During debugging I was checking to make sure this didn't change to RGB_565. Although the bitmap object was loaded as ARBG_8888 the image file did not contain an alpha channel and thus even though the bitmap had a byte for the alpha level and would allow me to edit the alpha byte of a pixel through Bitmap.setPixel( x, y, color) the bitmap object never recognized that it had alpha values set. When compressing the bitmap compressed to RGB_565 since the object thought that there was no alpha channel. Somehow this problem was resolved by passing the bitmap to a sub activity and parsing it. I'm guessing when object was being recreated the alpha values I had set were recognized. To solve the problem with out passing the bitmap to a subactivity one must add an alpha channel after decoding a bitmap from a file. I found a function to do so here.

private Bitmap adjustOpacity( Bitmap bitmap )
{
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();
    Bitmap dest = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    int[] pixels = new int[width * height];
    bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
    dest.setPixels(pixels, 0, width, 0, 0, width, height);
    return dest;
} 

I'm not sure if there is a more efficient method