Imageview set color filter to gradient

Question

I have a white image that I'd like to color with a gradient. Instead of generating a bunch of images each colored with a specific gradient, I'd like to do this in code (not xml).

To change an image's color, I use

imageView.setColorFilter(Color.GREEN);

And this works fine. But how can I apply a gradient color instead of a solid color? LinearGradient doesn't help, because setColorFilter can't be applied to Shader objects.

EDIT: This is the image I have:

This is what I want:

And this is what I'm getting:

Answer 1

You have to get Bitmap of your ImageView and redraw same Bitmap with Shader

public void clickButton(View v){
    Bitmap myBitmap = ((BitmapDrawable)myImageView.getDrawable()).getBitmap();

    Bitmap newBitmap = addGradient(myBitmap);
    myImageView.setImageDrawable(new BitmapDrawable(getResources(), newBitmap));
}


public Bitmap addGradient(Bitmap originalBitmap) {
    int width = originalBitmap.getWidth();
    int height = originalBitmap.getHeight();
    Bitmap updatedBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(updatedBitmap);

    canvas.drawBitmap(originalBitmap, 0, 0, null);

    Paint paint = new Paint();
    LinearGradient shader = new LinearGradient(0, 0, 0, height, 0xFFF0D252, 0xFFF07305, Shader.TileMode.CLAMP);
    paint.setShader(shader);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawRect(0, 0, width, height, paint);

    return updatedBitmap;
}

UPDATE 3 I changed: colors of gradient, LinearGradient width = 0 and PorterDuffXfermode. Here a good picture to understand PorterDuffXfermode: