Android TextView跑马灯效果实现方法

public class MyTextView extends TextView{  public MyTextView(Context context, AttributeSet attrs) {    super(context, attrs);    // TODO Auto-generated constructor stub  }  public MyTextView(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    // TODO Auto-generated constructor stub  }  public MyTextView(Context context) {    super(context);    // TODO Auto-generated constructor stub  }  @Override  public boolean isFocused() {    // TODO Auto-generated method stub    return true;   //must be return true;  }}

<packagename.MyTextView android:id="@+id/my_textview"android:layout_width="400px" android:layout_height="35px" android:singleLine="true" android:ellipsize="marquee"android:marqueeRepeatLimit="marquee_forever" android:textSize="22sp"/>