android set button background programmatically

I would like to know how to set the button color programatically? I have coded the following but fails:

Button11.setBackgroundColor(R.color.red);

Thanks!!

Solution 1:

R.color.red is an ID (which is also an int), but is not a color.

Use one of the following instead:

// If you're in an activity:
Button11.setBackgroundColor(getResources().getColor(R.color.red));
// OR, if you're not: 
Button11.setBackgroundColor(Button11.getContext().getResources().getColor(R.color.red));

Or, alternatively:

Button11.setBackgroundColor(Color.RED); // From android.graphics.Color

Or, for more pro skills:

Button11.setBackgroundColor(0xFFFF0000); // 0xAARRGGBB

Solution 2:

Old thread, but learned something new, hope this might help someone.

If you want to change the background color but retain other styles, then below might help.

button.getBackground().setColorFilter(ContextCompat.getColor(this, R.color.colorAccent), PorterDuff.Mode.MULTIPLY);

Solution 3:

The answer you're looking for in 2020 and beyond:

setColorFilter(color, mode) is deprecated since API 29 (as discussed here)
button.setBackgroundColor(color) messes with the button style

Now the proper way to set a buttons color is using BlendModeColorFilter() (see documentation).

Usage:

btn.background.colorFilter = BlendModeColorFilter(color, BlendMode.MULTIPLY)

If you work with older APIs too:

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)
}

Please vote to help others finding this answer - it took me quite a while figuring this out ^^

Solution 4:

You can set your desired color to the button programmatically like:

Button11.setBackgroundColor(Android.Graphics.Color.parseColor("#738b28"));

Also you can give the text color for a button like:

Button11.setTextColor(Android.Graphics.Color.parseColor("#FFFFFF"));

Solution 5:

I have found that Android Studio gives me a warning that getColor() is deprecated when trying to do this:

Button11.setBackgroundColor(getResources().getColor(R.color.red))

So I found doing the method below to be the simple, up-to-date solution:

Button11.setBackgroundColor(ContextCompat.getColor(context, R.color.red))

You want to avoid hard-coding in the color argument, as it is considered bad code style.

Edit: After using setBackgroundColor() with my own button, I saw that the internal button padding expanded. I couldn't find any way of changing it back to having both height and width set to "wrap_content". Maybe its a bug.

Source: https://stackoverflow.com/a/32202256/6030520