Android使用TextView跑马灯效果

/**
 * 跑马灯效果的TextView, 使用方式：
 * 启动/关闭：{@link #setMarqueeEnable(boolean)}
 * xml文件中记得设置：android:focusable="true", android:singleLine="true"
 *
 * Created by dasu on 2017/3/21.
 * http://www.jianshu.com/u/bb52a2918096
 */

public class MarqueeTextView extends TextView {

  private boolean isMarqueeEnable = false;

  public MarqueeTextView(Context context) {
    super(context);
  }

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

  public MarqueeTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
  }

  public void setMarqueeEnable(boolean enable) {
    if (isMarqueeEnable != enable) {
      isMarqueeEnable = enable;
      if (enable) {
        setEllipsize(TextUtils.TruncateAt.MARQUEE);
      } else {
        setEllipsize(TextUtils.TruncateAt.END);
      }
      onWindowFocusChanged(enable);
    }
  }

  public boolean isMarqueeEnable() {
    return isMarqueeEnable;
  }

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

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

  @Override
  public void onWindowFocusChanged(boolean hasWindowFocus) {
    super.onWindowFocusChanged(isMarqueeEnable);
  }
}