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!

Haulage

This is a better answer in case you might actually want to use a background selector https://mcmap.net/q/581895/-how-can-i-make-a-radiobutton-with-overlapping-text – Settling

Answer 1

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 ;)

Quarrel

I said above, I've tried this and it doesn't work for some reason. – Haulage

It's setBackgroundDrawable, not setButtonDrawable. – Quarrel

Oh, sorry, didn't see that. The problem is, that just removes the background, which where I'm setting my custom selector drawable. – Haulage

Ok, then you should set a transparent color in your selector xml. – Quarrel

Awesome, it worked with my selector with just this item: <item android:drawable="@android:color/transparent" />. If you add that to your answer, I'll mark it! Thanks! – Haulage

As of API 16, setBackgroundDrawable is deprecated. Use setBackground(null) instead in this case. – Commensurate

Answer 2

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

radioButton.setButtonDrawable(new StateListDrawable());

Chequered

This worked perfectly for me. Not sure why it is not the best answer. – Commensurate

this is same as setButtonDrawable(android.R.color.transparent); – Maren

Not on all devices, why? did not work on hTC one X, and worked on Nexus 4. – Propagandist

This worked better than the answer that is set as the answer! Thank you – Dday

Answer 3

setButtonDrawable(getResources().getDrawable(android.R.color.transparent)) should do the trick.

Only this worked for me.

Aga

You can simply put setButtonDrawable(android.R.color.transparent); as @amalan pointed out in a previous comment. – Drawbar

Answer 4

What worked for me in multiple devices and APIs and is as simple as it gets was setButtonDrawable(android.R.color.transparent);

Hack

Answer 5

in Kotlin you can do that

radioButton.buttonDrawable = null

Crossrefer