Get background color of a Layout

Question

I want to find the background color of a Layout from my code. Is there any way to find it? something like linearLayout.getBackgroundColor()?

Deductive

Since the background may not be a color, you can use linearLayout.getBackground() which will give you a Drawable. There is no API to get background color, specifically. Read more in the docs for View – Gas

But I really need to find the color of a layout. There should be some other way ! or is it possible to get it from Drawable? – Deductive

Why are you not pulling the background color from the theme? – Abysmal

Answer 1

This can only be accomplished in API 11+ if your background is a solid color.

int color = Color.TRANSPARENT;
Drawable background = view.getBackground();
if (background instanceof ColorDrawable)
    color = ((ColorDrawable) background).getColor();

Economize

I was just going to edit my answer and say that specifically that might work! However, I am not sure why there's an API 11+ restriction? ColorDrawable seems to be available since API 1, and also view.getBackground(). – Gas

Nevermind. I see that .getColor for ColorDrawable was added in API 11. – Gas

You could convert the Drawable to a Bitmap and get the first pixel. int color = bitmap.getPixel(0, 0); – Regin

I used this ((ColorDrawable) row.getBackground()).getColor() as (row.background as ColorDrawable).color but i faced with this error android.graphics.drawable.StateListDrawable cannot be cast to android.graphics.drawable.ColorDrawable – Enidenigma

Answer 2

To get background color of a Layout:

LinearLayout lay = (LinearLayout) findViewById(R.id.lay1);
ColorDrawable viewColor = (ColorDrawable) lay.getBackground();
int colorId = viewColor.getColor();

If It is RelativeLayout then just find its id and use there object instead of LinearLayout.

Haphtarah

Is there any reason against using ViewGroup (or even View) instead all it's possible sub classes to get the background? – Preside

Answer 3

ColorDrawable.getColor() will only work with API level above 11, so you can use this code to support it from API level 1. Use reflection below API level 11.

public static int getBackgroundColor(View view) {
        Drawable drawable = view.getBackground();
        if (drawable instanceof ColorDrawable) {
            ColorDrawable colorDrawable = (ColorDrawable) drawable;
            if (Build.VERSION.SDK_INT >= 11) {
                return colorDrawable.getColor();
            }
            try {
                Field field = colorDrawable.getClass().getDeclaredField("mState");
                field.setAccessible(true);
                Object object = field.get(colorDrawable);
                field = object.getClass().getDeclaredField("mUseColor");
                field.setAccessible(true);
                return field.getInt(object);
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        return 0;
    }

Katanga

Answer 4

Short and Simple way:

int color = ((ColorDrawable)view.getBackground()).getColor();

Nannana

Answer 5

For kotlin fans

fun View.getBackgroundColor() = (background as? ColorDrawable?)?.color ?: Color.TRANSPARENT

Morganatic

Answer 6

I think there are cases where background might not a ColorDrawable so we need to check it before the cast:

 if (view.background is ColorDrawable) {
     val bgColor = (view.background as ColorDrawable).color
 }

Rosendorosene