How to call a specific function on FocusChange of all buttons in android?

Question

Hi,

It's possible to specify a particular function to be called when button is clicked by setting its onClick attribute in xml: android:onClick="function_name" I want to do something similar for FocusChange of buttons, is this possible?

Specifically, I wish to increase my button's size when it has focus and make it normal sized when not focussed. To apply this to all my buttons, I hoped to call a specific function which does this and then specify this function name in my style.xml. But there is no onFocusChange attribute in android.

It works when I add overriden onSetFocusChangeListener for each of my buttons separately in the code. But is there any other solution?

Pls help.

-Kiki

Answer 1

Handling UI Events you need to implement event listeners.

// Create an anonymous implementation of OnClickListener
private OnClickListener mCorkyListener = new OnClickListener() {
    public void onClick(View v) {
      // do something when the button is clicked
    }
};

You can use the item selector to specify the states of a button:

<?xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
     <item android:state_pressed="true"
           android:drawable="@drawable/l_bar_default3" /> <!-- pressed -->
     <item android:state_focused="true"
           android:drawable="@drawable/l_bar_default3" /> <!-- focused -->
     <item android:drawable="@drawable/l_bar_pressed3" /> <!-- default -->
 </selector>