Android实现倒计时的按钮的示例代码

 new CountDownTimer(10000, 1000) {
          @Override
          public void onTick(long millisUntilFinished) {
            btn2.setEnabled(false);
            btn2.setText(String.format("%ds后重新发送验证码",millisUntilFinished/1000));
          }

          @Override
          public void onFinish() {
            btn2.setEnabled(true);
            btn2.setText("发送验证码");
          }
        }.start();

public class TimeButton extends Button implements View.OnClickListener {
  private long length = 60 * 1000;// 倒计时长度,这里给了默认60秒
  private String textafter = "秒后重新获取";
  private String textbefore = "点击获取验证码";
  private final String TIME = "time";
  private final String CTIME = "ctime";
  private OnClickListener mOnclickListener;
  private Timer t;
  private TimerTask tt;
  private long time;
  private Context mContext;
  Map map = new HashMap();

  public TimeButton(Context context) {
    super(context);
    setOnClickListener(this);

  }

  public TimeButton(Context context, AttributeSet attrs) {
    super(context, attrs);
    mCOntext= context;
    setOnClickListener(this);
  }

  @SuppressLint("HandlerLeak")
  Handler han = new Handler() {
    public void handleMessage(android.os.Message msg) {
      TimeButton.this.setText(time / 1000 + textafter);
      time -= 1000;
      if (time <0) {
        TimeButton.this.setEnabled(true);
        TimeButton.this.setText(textbefore);
        clearTimer();
      }
    }
  };

  private void initTimer() {
    time = length;
    t = new Timer();
    tt = new TimerTask() {
      @Override
      public void run() {
        Log.e("yung", time / 1000 + "");
        han.sendEmptyMessage(0x01);
      }
    };
  }

  private void clearTimer() {
    Toast.makeText(mContext, "计时结束", Toast.LENGTH_SHORT).show();
    if (tt != null) {
      tt.cancel();
      tt = null;
    }
    if (t != null)
      t.cancel();
    t = null;
  }

  @Override
  public void setOnClickListener(OnClickListener l) {
    if (l instanceof TimeButton) {
      super.setOnClickListener(l);
    } else
      this.mOnclickListener= l;
  }

  @Override
  public void onClick(View v) {
    if (mOnclickListener != null)
      mOnclickListener.onClick(v);
    initTimer();
    this.setText(time / 1000 + textafter);
    this.setEnabled(false);
    t.schedule(tt, 0, 1000);
  }

  /**
   * 和activity的onDestroy()方法同步
   */
  public void onDestroy() {
    if (MainActivity.map == null)
      MainActivity.map = new HashMap();
    MainActivity.map.put(TIME, time);
    MainActivity.map.put(CTIME, System.currentTimeMillis());
    clearTimer();
  }

  /**
   * 和activity的onCreate()方法同步
   */
  public void onCreate(Bundle bundle) {
    Log.e("yung", MainActivity.map + "");
    if (MainActivity.map == null)
      return;
    if (MainActivity.map.size() <= 0)// 这里表示没有上次未完成的计时
      return;
    long time = System.currentTimeMillis() - MainActivity.map.get(CTIME)
        - MainActivity.map.get(TIME);
    MainActivity.map.clear();
    if (time > 0)
      return;
    else {
      initTimer();
      this.time = Math.abs(time);
      t.schedule(tt, 0, 1000);
      this.setText(time + textafter);
      this.setEnabled(false);
    }
  }

  /**
   * 设置计时时候显示的文本
   */
  public TimeButton setTextAfter(String text1) {
    this.textafter = text1;
    return this;
  }

  /**
   * 设置点击之前的文本
   */
  public TimeButton setTextBefore(String text0) {
    this.textbefore = text0;
    this.setText(textbefore);
    return this;
  }

  /**
   * 设置到计时长度
   *
   * @param lenght 时间 默认毫秒
   * @return
   */
  public TimeButton setLenght(long lenght) {
    this.length = lenght;
    return this;
  }
}