how can i control the speed of my marquee in android?

[kerepoiptioms]

my java code goes like this..\[code\]import android.app.Activity;import android.os.Bundle;import android.widget.TextView;public class TextviewActivity extends Activity { /** Called when the activity is first created. */ private TextView myTextView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); myTextView= (TextView) this.findViewById(R.id.my_text_view); myTextView.setSelected(true); }}\[/code\]and my xml code is this..\[code\]import android.app.Activity;import android.os.Bundle;import android.widget.TextView;public class TextviewActivity extends Activity { /** Called when the activity is first created. */ private TextView myTextView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); myTextView= (TextView) this.findViewById(R.id.my_text_view); myTextView.setSelected(true); }}\[/code\]i've searched so many codes but it's not running.. i appreciate evey comment..