跑马灯textview

public class MarqueeTextView extends TextView {
   public MarqueeTextView(Context con) {
      super(con);
   }

   public MarqueeTextView(Context context, AttributeSet attrs) {
      super(context, attrs);
   }

   public MarqueeTextView(Context context, AttributeSet attrs, int defStyle) {
      super(context, attrs, defStyle);
   }

   @Override
   public boolean isFocused() {
      return true;
   }

   @Override
   protected void onFocusChanged(boolean focused, int direction,
         Rect previouslyFocusedRect) {
   }
}

/**
 * 切换跑马灯效果
 * @param isOn isOn为true代表开启,为false代表关闭
 * @since 2015-7-2下午3:33:20
 * @author cuixingwang
 */
public void switchTitleMarquee(boolean isOn){
   if(isOn){
      tv_title.setEllipsize(TextUtils.TruncateAt.MARQUEE);
      tv_title.setMarqueeRepeatLimit(Integer.MAX_VALUE);
      tv_title.setLayoutParams(new LinearLayout.LayoutParams(DensityUtils.dp2px(context, 180), LayoutParams.WRAP_CONTENT));
      tv_title.setHorizontallyScrolling(true);
   }else{
      tv_title.setEllipsize(TextUtils.TruncateAt.END);
      tv_title.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
   }
}