JAVA

android studio change button color programmatically

// 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));

button color wont change android studio

//Add this to your button xml element

android:background="@android:color/[INSERT_COLOR]"
//You might have to change the text color to make the text readable

//Change this line in both of the themes.xml files

<style name="Theme.[INSERT_APP_NAME]" parent="Theme.MaterialComponents.DayNight.DarkActionBar">

//to 

<style name="Theme.[INSERT_APP_NAME]" parent="Theme.AppCompat.DayNight.NoActionBar">

// you can change the .NoActionBar to light action bar or dark action bar if you want to

android studio change button color programmatically

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

android studio change button color programmatically

startBtn.getBackground().setColorFilter(Color.BLUE, PorterDuff.Mode.SRC_ATOP);

cant change button color when app run android studio

replace <Button with <androidx.appcompat.widget.AppCompatButton