Question

I have sucessfully made and used RadioGroup’s before in xml, but each time there was a set of radio buttons in succession, all within the same LinearLayout. Now I wish to define a set of radio buttons to be part of a group, but they are not in the same layout. My start and end code for the group is:

START:

<RadioGroup    android:id="@+id/radioGroup1" >

END:

</RadioGroup>

If I place this around each button individually, then it compiles, but the buttons don’t act as radio buttons (i.e. activating one did not de-activate the others). If I try to place the “start” before any of the buttons and put the “end” after the last of them, then I get compilation errors.

Answer 1

Store the RadioButtons in an array. Instead of grouping them in a RadioGroup, you have to enable/disable them yourself. (un-tested so no copying/pasting )

declare these variables

private ArrayList<RadioButton> mGroup = new ArrayList<RadioGroup>();
private CompoundButton.OnCheckedChangeListener mListener = new CompoundButton.OnCheckedChangeListener()
{
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
    {
        for(RadioButton btn : mGroup)
            btn.setChecked(false);

        buttonView.setChecked(true);
    }
}

Somewhere in your activity:

mGroup.add(your radiobuttons);    // e.g. (RadioButton)findViewById(R.id.radio_button1);
mGroup.add(another radiobutton);

for(RadioButton btn : mGroup)
   btn.setOnCheckedChangeListener(mListener)

Maybe you have to invalidate your Buttons after checking/unchecking them, to cause a redraw