Change the shape color of a ImageButton

Question

I have a recyclerView where I create 12 ImageButtons. As default they are all black colored, because I made a custom shape for the imageButton that have a black solid color.

Answer 1

Your problem is that in your case getBackground() is returning a RippleDrawable, not a GradientDrawable. Both extend Drawable, but you can not cast one to the other. Try this:

public List initColorButtons(){
    colorButtonList = new ArrayList<>();

    //here we retrive all colors from color.xml
    Resources resources = App.getAppContext().getResources();
    String colors[] = resources.getStringArray(R.array.backgroundcolors);

    for(int i=0; i

Result:

You can read more on how to create a ColorStateList in this SO question.

EDIT: In order to correctly modify the buttons you create with the method onCreateViewHolder, you need to implement onBindViewHolder in your Adapter and change the color of your buttons there.

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
        Drawable drawable = holder.getBackground();

        if (drawable instanceof GradientDrawable) {
            GradientDrawable gd = (GradientDrawable) drawable.getCurrent();
            gd.setColor(Color.parseColor(colors[position]));
        } else if (drawable instanceof RippleDrawable) {
            RippleDrawable rd = (RippleDrawable) drawable;
            int color = Color.parseColor(colors[position]);
            rd.setColor(newColorStateList(color));
        }
}