Android 实现不依赖焦点和选中的TextView跑马灯

public class MarqueeTextView extends TextView {  /** 是否停止滚动 */  private boolean mStopMarquee;  private String mText;  private float mCoordinateX;  private float mTextWidth;  public MarqueeTextView(Context context, AttributeSet attrs) {    super(context, attrs);  }  public void setText(String text) {    this.mText = text;    mTextWidth = getPaint().measureText(mText);    if (mHandler.hasMessages(0))      mHandler.removeMessages(0);    mHandler.sendEmptyMessageDelayed(0, 2000);  }  @Override  protected void onAttachedToWindow() {    mStopMarquee = false;    if (!StringUtils.isEmpty(mText))      mHandler.sendEmptyMessageDelayed(0, 2000);    super.onAttachedToWindow();  }  @Override  protected void onDetachedFromWindow() {    mStopMarquee = true;    if (mHandler.hasMessages(0))      mHandler.removeMessages(0);    super.onDetachedFromWindow();  }  @Override  protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    if (!StringUtils.isEmpty(mText))      canvas.drawText(mText, mCoordinateX, 15, getPaint());  }  private Handler mHandler = new Handler() {    @Override    public void handleMessage(Message msg) {      switch (msg.what) {      case 0:        if (Math.abs(mCoordinateX) > (mTextWidth + 100)) {          mCoordinateX = 0;          invalidate();          if (!mStopMarquee) {            sendEmptyMessageDelayed(0, 2000);          }        } else {          mCoordinateX -= 1;          invalidate();          if (!mStopMarquee) {            sendEmptyMessageDelayed(0, 30);          }        }        break;      }      super.handleMessage(msg);    }  };}