Merge two bitmaps in android

Question

I want to merge two bitmaps, here is my code

// Camera arg conversion to Bitmap
                    Bitmap cameraBitmap = BitmapFactory.decodeByteArray(arg0,         


        

Answer 1

From your example, you forgot to add the next lines:

 comboImage.drawBitmap(c, 0f, 0f, null); 
 comboImage.drawBitmap(s, 0f, c.getHeight(), null);

In your example above you don't draw your image in the canvas, and that is the problem. You can think that your canvas i your sketchbook. For now you didn't paint anything, and you ask yourself, way I can't see any colors.

So, for my advice, first create the two bitmaps, then, do the next thing:

c.drawBitmap(cameraBitmap, top point, left point, null);
c.drawBitmap(foreground, top point, left point, null); 

You can also do this by first create the drawable objects from your bitmaps, like in the next code:

Drawable cameraBitmap = BitmapDrawable(cameraBitmap);
Drawable foreground= BitmapDrawable(foreground);

Then when you have the drawable objects, you can set thier bounds, and that way you set where do you want to show that image.

cameraBitmap.setBounds(left, top, right, bottom);
foreground.setBounds(left, top, right, bottom);

and finally draw that on the canvas:

cameraBitmap.draw(canvas);
foreground.draw(canvas);

EDIT:

This is an example, use this to understand your implementation:

    Bitmap bitmap = null;
    try {

        bitmap = Bitmap.createBitmap(500, 500, Config.ARGB_8888);
        Canvas c = new Canvas(bitmap);
        Resources res = getResources();


        Bitmap bitmap1 = BitmapFactory.decodeResource(res, R.drawable.test1); //blue

        Bitmap bitmap2 = BitmapFactory.decodeResource(res, R.drawable.test2); //green
        Drawable drawable1 = new BitmapDrawable(bitmap1);
        Drawable drawable2 = new BitmapDrawable(bitmap2);


        drawable1.setBounds(100, 100, 400, 400);
        drawable2.setBounds(150, 150, 350, 350);
        drawable1.draw(c);
        drawable2.draw(c);


    } catch (Exception e) {
    }
    return bitmap;

This is what I get from the code above: