How do you get the background color of a button?

Question

How do you get the background color of a button? I've tried the following:

 public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn1 = findViewById(R.id.button);
        btn1.setBackgroundColor(getResources().getColor(R.color.red));
        //color red is added to colors.xml <color name="red">#FF0000</color>

        btn1.setOnClickListener(v -> {

          ColorDrawable btnColor = (ColorDrawable) btn1.getBackground();

          int clr = btnColor.getColor();

          if (clr == getResources().getColor(R.color.red)) {
              String line = "it's red";
              btn1.setText(line);
            }
        });
    }
}

When I click the button the app closes and I get this

 java.lang.ClassCastException: android.graphics.drawable.RippleDrawable cannot be cast to android.graphics.drawable.ColorDrawable

Can anyone explain what I'm doing wrong?

@GabrieleMariotti Yeah I'm using a MaterialComponents theme with my app, is it this that's causing the problem? — jason, May 24 '21 at 12:26
@jason Check https://stackoverflow.com/questions/62191132/how-to-get-background-color-in-materialbutton-in-kotlin-android/62193139#62193139 — Gabriele Mariotti, May 24 '21 at 13:18

score 1 · Accepted Answer · answered May 24 '21 at 14:20

Since you are using a MaterialComponents theme your Button is replaced at runtime by a MaterialButton.

Use the setBackgroundTintList instead of the setBackgroundColor and use getBackgroundTintList() to retrieve the ColorStateList.

Something like:

    MaterialButton button = findViewById(R.id.button);
    button.setBackgroundTintList(ColorStateList.valueOf(ContextCompat.getColor(this, R.color.red600)));
    ColorStateList colorStateList = button.getBackgroundTintList();

    int defaultColor = colorStateList.getColorForState(
            new int[] { android.R.attr.state_enabled},0);

the way I'm understanding this approach is that you are getting the color assigned to the given state. Which is technically different than finding the current color of the button. Is there a way to programmatically get at the current state of the control (rather than directly pass in the android.R.attr.state_enabled)? — evve, Oct 26 '22 at 20:55

score 0 · Answer 2 · answered May 23 '21 at 20:12

0

you can get this as a drawable:

Button mButton = (Button) findViewById(R.id.button);
Drawable buttonBackground = mButton.getBackground();

if its a color you can do like this:

ColorDrawable btnColor = (ColorDrawable) button.getBackground();

get out resource id of the color:

Int color = btnColor.getColor();

then compare this with your color:

if (color == R.color.green) {
   log("color is green");
}

answered May 23 '21 at 20:12

Hassan

380
6
20

Sorry I'm pretty new to Java and the android studio, but isn't what you posted what I've got except with the if statement, mine sets the text of a button instead of posting to 'log'? – jason May 24 '21 at 12:29

score -1 · Answer 3 · edited May 24 '21 at 15:04

-1

ColorDrawable buttonColor = (ColorDrawable) button.getBackground();
int colorId = buttonColor.getColor();
if (colorID == R.color.green) {
  log("color is green");
}

Using the above you can find a button color.

edited May 24 '21 at 15:04

Benkerroum Mohamed

1,867
3
13
19

answered May 23 '21 at 19:55

Suraj Pendhare

1

For some reason it's not working with android studio? – jason May 24 '21 at 12:31
@jason have you found any solution? – Suraj Pendhare Jun 18 '21 at 08:34

How do you get the background color of a button?

3 Answers3