<com.KeepCountdownView.KeepCountdownView
      android:id="@+id/keep1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      //各種可選屬性
      app:arcColor="#FB5858"
      app:numColor="#7CB4EF"
      app:XXX/>

 @Override
  protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.keep_act);
    ButterKnife.bind(this);
    //倒計時監(jiān)聽
    keep1.setCountdownListener(new KeepCountdownView.CountdownListener() {
      @Override
      public void onStart() {
      }

      @Override
      public void onEnd() {
        
      }
    });
  }

  @OnClick(R.id.b1)
  public void b1(View v) {
    keep1.plus(5);//增加5s

  }

  @OnClick(R.id.b2)
  public void b2() {
    keep1.post(new Runnable() {
      @Override
      public void run() {
        keep1.startCountDown();//開始倒計時
      }
    });
  }

  @OnClick(R.id.b4)
  public void b4() {
    keep1.reset();//重置
  }