How to work with xml and java (android) : <p>How do I make something in xml, and change the value of it in Java?</p>

<p>ex:</p>

<pre><code>&lt;TextView
    android:text="Hello World!"
    android:textSize="50dp"
    android:layout_marginTop="27dp"
    android:id="@+id/textView"
    android:editable="true"
    android:enabled="true" /&gt;
</code></pre>

<p>Now how do I edit the text from being "Hello World" to something else in Java?</p>
