Button text should be changed to “ok” in the java code programmably, when the button is clicked

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XML

Java

I have the following layout XML for an activity. The button text should be changed to "ok" in the Java code programmably, when the button is clicked. Please write the code to accomplish that. Just write the statements directly related to the requirement.

What I have tried:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="16dp"
    android:paddingRight="16dp" >
    <Button
        android:id="@+id/my_button"
        android:layout_width="96dp"
        android:layout_height="wrap_content"
        android:text="@string/done" 
        android:onClick="changeText" 
    />
</RelativeLayout>