How can I programmatically set android:button="@null"?

Question

I'm trying to programmatically add a set of RadioButtons to a RadioGroup like so:

for (int i = 0; i < RANGE; i++) {     RadioButton button = new RadioButton(this);     button.setId(i);     button.setText(Integer.toString(i));     button.setChecked(i == currentHours); // Select button with same index as currently selected number of hours     button.setButtonDrawable(Color.TRANSPARENT);     button.setBackgroundResource(R.drawable.selector);     button.setOnClickListener(new OnClickListener() {         @Override         public void onClick(View view) {             ((RadioGroup)view.getParent()).check(view.getId());             currentHours = view.getId();         }     });      radioGroupChild.addView(button); } 

and I need to set the button drawable to null (I want just text on top of my background). Manually doing this in the XML with android:button="@null" works great, but I don't want to hardcode each radio button. I've tried just doing button.setButtonDrawable(null) but it doesn't change anything.

Any help is greatly appreciated!

Answer 1

You need to set an empty StateListDrawable as the drawable. So the Java equivalent of android:button="@null" is:

radioButton.setButtonDrawable(new StateListDrawable()); 

Answer 2

You should do this:

button.setBackgroundDrawable(null); 

If your drawable has a reference to selector you can make it transparent through your selector xml:

<item android:drawable="@android:color/transparent" /> 

as you'd probably found the solution ;)