EditText get the listener after change text

TextView tv = (TextView)findViewById(R.id.tv);
    textMessage = (EditText)findViewById(R.id.textMessage);
    textMessage.addTextChangedListener(new TextWatcher(){
        public void afterTextChanged(Editable s) {
            tv.setText(String.valueOf(i));
        }
        public void beforeTextChanged(CharSequence s, int start, int count, int after){}
        public void onTextChanged(CharSequence s, int start, int before, int count){}
    }); 

layout in here

<RadioGroup

		android:id="@+id/segment01"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
   <RadioButton
android:id="@+id/button_two"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_weight="1"
       android:layout_gravity="center|left"/>
   <RadioButton
android:id="@+id/button_two"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_gravity="center|right" />
    </RadioGroup>