VerCodeTimer mVerCodeTimer=(Button) findViewById(R.id.login_get_ver_code);
private class VerCodeTimer extends CountDownTimer {
    private int seconds;
    private int interval;
    //millisInFuture为你设置的此次倒计时的总时长，比如60秒就设置为60000
    //countDownInterval为你设置的时间间隔，比如一般为1秒,根据需要自定义。
    public VerCodeTimer(long millisInFuture, long countDownInterval) {
      super(millisInFuture, countDownInterval);
      seconds = (int) (millisInFuture / 1000);
      interval= (int) (countDownInterval/1000);
    }
    //每过你规定的时间间隔做的操作
    @Override
    public void onTick(long millisUntilFinished) {
      getVerCodeButton.setText((seconds-interval) + "秒后重新获取");
    }
    //倒计时结束时做的操作↓↓
    @Override
    public void onFinish() {
      getVerCodeButton.setTextSize(10);
      getVerCodeButton.setText("重新获取验证码");
      getVerCodeButton.setClickable(true);
      getVerCodeButton.setBackgroundResource(R.drawable.login_get_ver_code_before_bg);
    }
  }
　　
 @Override
  public void onBackPressed() {
    if (mVerCodeTimer != null)
      mVerCodeTimer.cancel();
    super.onBackPressed();
  } 

getVerCodeButton.setTextSize(11);
 getVerCodeButton.setClickable(false);
 getVerCodeButton.setBackgroundResource(R.drawable.login_get_ver_code_ago_bg);
 mVerCodeTimer = new VerCodeTimer(60000, 1000);
 mVerCodeTimer.start(); 

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle"
  android:useLevel="false">
  <!-- 背景填充颜色值 -->
  <solid android:color="#6c948b" />
  <!-- radius值越大，越趋于圆形 -->
  <corners android:radius="10dip" />
  <!-- 圆角图像内部填充四周的大小 ，将会以此挤压内部布置的view -->
  <padding
    android:bottom="10dip"
    android:left="10dip"
    android:right="10dip"
    android:top="10dip" />
</shape> 

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle"
  android:useLevel="false">
  <!-- 背景填充颜色值 -->
  <solid android:color="#509989" />
  <!-- radius值越大，越趋于圆形 -->
  <corners android:radius="10dip" />
  <!-- 圆角图像内部填充四周的大小 ，将会以此挤压内部布置的view -->
  <padding
    android:bottom="10dip"
    android:left="10dip"
    android:right="10dip"
    android:top="10dip" />
</shape>