Android获取验证码倒计时实现代码

<LinearLayout 
   android:layout_width="match_parent"
   android:layout_height="50dp"
   android:background="@color/white"
   android:orientation="horizontal"  

   <EditText
     android:id="@+id/phonetext"
     android:layout_width="0dp"
     android:layout_height="match_parent"
     android:layout_weight="1"
     android:layout_marginLeft="15dp"
     android:layout_gravity="center_vertical"
     android:inputType="number"
     android:hint="请输入短信验证码"
     android:background="@null"/ 

   <Button
     android:id="@+id/timebutton"
     android:layout_width="wrap_content"
     android:layout_height="30dp"
     android:layout_marginRight="15dp"
     android:layout_marginTop="10dp"
     android:textSize="16dp"
     android:background="@drawable/tv_timemessage_bg"
     android:text="获取"
    / 
</LinearLayout 

/**
 * Created by fby on 2017/9/11.
 */
public class ChargepsdActivity extends Activity {

  private Button timeButton;

  @Override
  protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_chargepsd);

    timeButton = (Button) findViewById(R.id.timebutton);
    //new倒计时对象,总共的时间,每隔多少秒更新一次时间
    final MyCountDownTimer myCountDownTimer = new MyCountDownTimer(60000,1000);

    //设置Button点击事件触发倒计时
    timeButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        myCountDownTimer.start();
      }
    });
}

//倒计时函数
  private class MyCountDownTimer extends CountDownTimer {

    public MyCountDownTimer(long millisInFuture, long countDownInterval) {
      super(millisInFuture, countDownInterval);
    }

    //计时过程
    @Override
    public void onTick(long l) {
      //防止计时过程中重复点击
      timeButton.setClickable(false);
      timeButton.setText(l/1000+"秒");

    }

    //计时完毕的方法
    @Override
    public void onFinish() {
      //重新给Button设置文字
      timeButton.setText("重新获取");
      //设置可点击
      timeButton.setClickable(true);
    }
  }

}

private void clearTimer() {
    if (task != null) {
      task.cancel();
      task = null;
    }
    if (timer != null) {
      timer.cancel();
      timer = null;
    }
  }