Common Listener for a bunch of radio groups

Question

I have about 60 radio groups that I need to register a listener for. Currently this is how I do it:

    RadioGroup rg1 = (RadioGroup) getView().findViewById(R.id.rdoGrp1);
    rg1.setOnCheckedChangeListener(this);
    rg1 = (RadioGroup) getView().findViewById(R.id.rdoGrp2);
    rg1.setOnCheckedChangeListener(this);
    rg1 = (RadioGroup) getView().findViewById(R.id.rdoGrp3);
    rg1.setOnCheckedChangeListener(this);

and so on for the 60 radio groups. Is there a way to set all radio groups on the fragment to register to a common listener in a single statement or two without having to type out this much code? Thanks

Answer 1

If all the RadioGroup elements share the same parent, you could iterate using ViewGroup.getChildAt and ViewGroup.getChildCount. Something like this:

ViewGroup parent = (ViewGroup) findViewById(R.id.ParentViewId);
for (int i = 0; i < parent.getChildCount(); i++) {
    View currentView = parent.getChildAt(i);
    if (currentView instanceof RadioGroup) {
        ((RadioGroup) currentView).setOnCheckedChangeListener(this);
    }
}

Answer 2

An easy solution would be to create a method in your activity or whatever class you are writing, something like this:

private void registerListenerToGroup(int groupId) {
    RadioGroup rg = (RadioGroup) getView().findViewById(groupId);
    rg.setOnCheckedChangeListener(this);
}

Then, call this method from your code like this:

registerListenerToGroup(R.id.rdoGrp1);
registerListenerToGroup(R.id.rdoGrp2);
registerListenerToGroup(R.id.rdoGrp3);
//etc.