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copied!<p>Check the API here:</p> <p><a href="http://developer.android.com/reference/android/widget/RadioGroup.OnCheckedChangeListener.html" rel="nofollow">http://developer.android.com/reference/android/widget/RadioGroup.OnCheckedChangeListener.html</a></p> <p>EDIT:</p> <p>Not happy about how long it took, but I figured this out. Turns out onCheckedChanged only passes -1 for the checkedId when the group is already clear. If a box has just been unchecked, its ID is still passed.</p> <p>You can do this:</p> <pre><code> myGroup2.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){ @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if(checkedId != -1 && ((RadioButton) findViewById(checkedId)).isChecked()){ myGroup3.clearCheck(); } } }); myGroup3.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){ @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if(checkedId != -1 && ((RadioButton) findViewById(checkedId)).isChecked()){ myGroup2.clearCheck(); } } }); </code></pre> <p>Or, probably a little more sensibly, have the activity implement the listener and this part is outside of the onCreate method:</p> <pre><code>@Override public void onCheckedChanged(RadioGroup group, int checkedId) { if(checkedId != -1 && ((RadioButton) findViewById(checkedId)).isChecked()){ if(group == myGroup2){ myGroup3.clearCheck(); } else if(group == myGroup3){ myGroup2.clearCheck(); } // And your switch for whatever you want to happen based on the // selected button goes here } } </code></pre>

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