LinearLayout getBackground().getColor() return wrong int value

Issue

I am implementig UI Tests using espresso. My boss wants me to check that after a certain action a linearLayout has a new and the correct color. I've wrote a custom matcher which looks like this

public static Matcher<View> withBgColor(final int color) {

    Checks.checkNotNull(color);

    return new BoundedMatcher<View, LinearLayout>(LinearLayout.class) {
        @Override
        public boolean matchesSafely(LinearLayout layout) {
            MyLog.debug(String.valueOf(color) + " vs " + String.valueOf(((ColorDrawable) layout.getBackground()).getColor()));
            return color == ((ColorDrawable) layout.getBackground()).getColor();
            //return color == (((PaintDrawable) layout.getBackground()).getPaint()).getColor();
        }
        @Override
        public void describeTo(Description description) {
            description.appendText("With background color: ");
        }
    };
}

My problem is that the comparison of the provided color and the color from the background are not the same. In the app I can see that the right color is set. It is done like this:

holder.linearLayout.setBackgroundColor(ctx.getResources().getColor(R.color.grey_300));

As soon as the test tries to compare the values they differ from each other:

Log: CustomMatcher: 17170432 vs -2039584

I call the matcher like this

.check(matches(withBgColor(R.color.grey_300)));

Can anyone help me how I can check if the color matches? The way I did fails everytime... Thanks

Solution

The problem is that both a color and a color resource ID are implemented as integers. You are passing the value of R.color.grey_300, which is a generated number representing the resource ID, instead of the color itself.

You should instead match in this way: .check(matches(withBgColor(context.getColor(R.color.grey_300))));

If you are worried that getColor() is deprecated, use ContextCompat.getColor(context, R.color.grey_300) instead.

Answered By - npace