I can't create an onCheckedChanged listener for my RadioGroup

问题

I'm trying to create an onCheckedChanged Listener for my RadioGroup, but eclipse is throwing erros at me. this is the code

rg = (RadioGroup) findViewById(R.id.radioGroup1);

rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        Log.d("chk", "id" + checkedId);

        if (checkedId == R.id.switchToFriends) {
            // some code
        } else if (checkedId == R.id.switchToUsers) {
            // some code
        }
    }
});

And from eclipse I get an error on setOnCheckedChangeListener suggesting to change it to setOnClickListener/setOnDragListener, and others.
On new OnCheckedChangeListener() it tells me to add unimplemented methods, and when I select that option it adds this :

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    // TODO Auto-generated method stub

}

So I end up with this:

rg = (RadioGroup) findViewById(R.id.radioGroup1);

rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        Log.d("chk", "id" + checkedId);

        if (checkedId == R.id.switchToFriends) {
            // some code
        } else if (checkedId == R.id.switchToUsers) {
            // some code
        }
    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        // TODO Auto-generated method stub

    }
});

And it tells me to remove the @Override annotation from the method that I wrote.
Anyone knows why it won't let me override the method that way? I've checked the android docs and the method it shows there uses the format that I try to override

回答1:

Make sure you imported the correct package import android.widget.RadioGroup.OnCheckedChangeListener; then the @Override will be correct

回答2:

You can directly add the listener with the ClassName

 radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // TODO Auto-generated method stub

        }
    });

If, for example, you already are using a CompoundButton and associated OnCheckedChangeListener, you will not be able to import the RadioGroup class, but will still be able to access it directly using this solution.