Why method setBackgroundColor() in Android Studio doesn't work?

Question

mButton.setBackgroundColor(Color.GREEN) ;

So, I used that method to change the color of a button when it's clicked. Button was initialized like private in MainActivity and this in onCreate():mButton = (Button) findViewById( R.id.button_count); I tried to cast it to View and still doesn't work. Maybe, it can help you - when I set any color in Attribute Pane attribute background, color of a button doesn't change.

I want to know how to change background color in java code or what's wrong with my program. Thank you

That is probably a variation on [this problem](https://stackoverflow.com/q/64722733/115145). — CommonsWare, Feb 13 '21 at 12:54
Does this answer your question? [Android button background color](https://stackoverflow.com/questions/18070008/android-button-background-color) — Style-7, Feb 13 '21 at 13:13
This [edit](https://stackoverflow.com/posts/66185313/timeline#history_491c0994-5248-4f24-8ca4-c7fb00679bfd) to the question completely changes the question and renders the existing answers and discussion confusingly off topic. — Jon, Apr 20 '21 at 18:20

score 0 · Answer 1 · edited Mar 15 '21 at 18:34

0

Try with this line:

mButton.setBackgroundColor(getResources().getColor(R.color.Green));

Note : Green color defined in color.xml

edited Mar 15 '21 at 18:34

Shay Kin

2,539
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answered Feb 13 '21 at 12:59

Mohit Kumar

41
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score 0 · Answer 2 · edited Mar 15 '21 at 22:50

button.setcolorfilter(Color) was deprecated in API 29.

button.setBackgroundColor(color) messes with the button style.

So here is a new way to do this using BlendModeColorFilter(): https://developer.android.com/reference/android/graphics/BlendModeColorFilter

See the above link for documentation.

fun setButtonColor(btn: Button, color: Int) {
    if (Build.VERSION.SDK_INT >= 29)
        btn.background.colorFilter = BlendModeColorFilter(color, BlendMode.MULTIPLY)
    else
        btn.background.setColorFilter(color, PorterDuff.Mode.MULTIPLY)
}

According to the new APIs, color filters work fine.

Why method setBackgroundColor() in Android Studio doesn't work?

2 Answers2