Marquee effect in TextView tutorial

Here is the code

xml File

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xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent">              android:id="@+id/mywidget"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignParentRight="true"         android:lines="1"         android:ellipsize="marquee"         android:fadingEdge="horizontal"         android:marqueeRepeatLimit="marquee_forever"         android:scrollHorizontally="true"         android:textColor="#ff4500"         android:text="Simple application that shows how to use marquee, with a long text" />

java file 

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public class TextViewMarquee extends Activity {     private TextView tv;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         tv = (TextView) this.findViewById(R.id.tv);           tv.setSelected(true);  // Set focus to the textview     } }