Android: RadioGroup - How to configure the event listener

Question

From my understanding, to determine if a checkbox is "clicked" and find if it's checked or not, code such as the following can be used:

cb=(CheckBox)findViewById(R.id.chkBox1);         cb.setOnCheckedChangeListener(this);  public void onCheckedChanged(CompoundButton buttonView,      boolean isChecked) {          if (isChecked) {              cb.setText("This checkbox is: checked");          }          else {              cb.setText("This checkbox is: unchecked");          }      } 

However, I am unable to work out the logic on how to do the above for a radiogroup.

Here is the xml for my RadioGroup:

<RadioGroup android:id="@+id/radioGroup1"  android:layout_width="wrap_content"  android:layout_height="wrap_content">     <RadioButton android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:id="@+id/radio1" android:checked="true"      android:text="RadioButton1">     </RadioButton>     <RadioButton android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:id="@+id/radio2" android:text="RadioButton2" android:checked="true">     </RadioButton>     <RadioButton android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:id="@+id/radio3" android:text="RadioButton3">     </RadioButton> </RadioGroup> 

Question: Do i need to setup another listener, or will the listener already there also "register" this group?

Also, should the listener be set up on the RadioGroup or the RadioButton?

Answer 1

This is how you get the checked radiobutton:

// This will get the radiogroup RadioGroup rGroup = (RadioGroup)findViewById(r.id.radioGroup1); // This will get the radiobutton in the radiogroup that is checked RadioButton checkedRadioButton = (RadioButton)rGroup.findViewById(rGroup.getCheckedRadioButtonId()); 

To use the listener, you do this:

// This overrides the radiogroup onCheckListener rGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {     public void onCheckedChanged(RadioGroup group, int checkedId)     {         // This will get the radiobutton that has changed in its check state         RadioButton checkedRadioButton = (RadioButton)group.findViewById(checkedId);         // This puts the value (true/false) into the variable         boolean isChecked = checkedRadioButton.isChecked();         // If the radiobutton that has changed in check state is now checked...         if (isChecked)         {             // Changes the textview's text to "Checked: example radiobutton text"             tv.setText("Checked:" + checkedRadioButton.getText());         }     } });