Andorid实现点击获取验证码倒计时效果

public class CountDownTimerUtils extends CountDownTimer {
  private TextView mTextView;
 
  /** 
   * @param textView     The TextView 
   * 
   * 
   * @param millisInFuture  The number of millis in the future from the call 
   *             to {@link #start()} until the countdown is done and {@link #onFinish()} 
   *             is called. 
   * @param countDownInterval The interval along the way to receiver 
   *             {@link #onTick(long)} callbacks. 
   */ 
  public CountDownTimerUtils(TextView textView, long millisInFuture, long countDownInterval) { 
    super(millisInFuture, countDownInterval); 
    this.mTextView = textView; 
  }

  /**
   * 倒计时期间会调用
   * @param millisUntilFinished
   */
  @Override 
  public void onTick(long millisUntilFinished) { 
    mTextView.setClickable(false); //设置不可点击 
    mTextView.setText(millisUntilFinished / 1000 + "秒"); //设置倒计时时间
    mTextView.setBackgroundResource(R.drawable.shape_verify_btn_press); //设置按钮为灰色，这时是不能点击的
 
    SpannableString spannableString = new SpannableString(mTextView.getText().toString()); //获取按钮上的文字
    ForegroundColorSpan span = new ForegroundColorSpan(Color.RED);
    /** 
     * public void setSpan(Object what, int start, int end, int flags) { 
     * 主要是start跟end，start是起始位置,无论中英文，都算一个。 
     * 从0开始计算起。end是结束位置，所以处理的文字，包含开始位置，但不包含结束位置。 
     */ 
    spannableString.setSpan(span, 0, 2, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);//将倒计时的时间设置为红色
    mTextView.setText(spannableString); 
  }

  /**
   * 倒计时完成后调用
   */
  @Override 
  public void onFinish() { 
    mTextView.setText("重新获取验证码"); 
    mTextView.setClickable(true);//重新获得点击 
    mTextView.setBackgroundResource(R.drawable.shape_verify_btn_normal); //还原背景色
  } 
} 

 <?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle" >

  <!-- 填充的颜色：这里设置背景透明 -->
  <solid android:color="@color/maincolor" />
  <!-- 边框的颜色 ：不能和窗口背景色一样-->
  <stroke
    android:width="1dp"
    android:color="@color/white" />
  <!-- 设置按钮的四个角为弧形 -->
  <!-- android:radius 弧形的半径 -->
  <corners android:radius="5dip" />

  <!-- padding：Button里面的文字与Button边界的间隔 -->
  <padding
    android:bottom="5dp"
    android:left="5dp"
    android:right="5dp"
    android:top="5dp" />
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle" >

  <!-- 填充的颜色：这里设置背景透明 -->
  <solid android:color="@color/graywhite" />
  <!-- 边框的颜色 ：不能和窗口背景色一样-->
  <stroke
    android:width="1dp"
    android:color="@color/white" />
  <!-- 设置按钮的四个角为弧形 -->
  <!-- android:radius 弧形的半径 -->
  <corners android:radius="5dip" />

  <!-- padding：Button里面的文字与Button边界的间隔 -->
  <padding
    android:bottom="5dp"
    android:left="5dp"
    android:right="5dp"
    android:top="5dp" />
</shape>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="@drawable/login_bg">

  <EditText
    android:id="@+id/rst_phone_number"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:inputType="phone"
    android:hint="@string/phone_number"
    android:textSize="16sp"
    android:textColor="@color/black"
    android:singleLine="true"
    android:background="@drawable/shape_form"
    android:textCursorDrawable="@drawable/text_cursor"
    android:layout_marginLeft="30dp"
    android:layout_marginRight="30dp"
    android:layout_marginTop="30dp"
    android:layout_gravity="center_vertical"/>

  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:layout_marginLeft="30dp"
    android:layout_marginRight="30dp"
    android:layout_marginTop="15dp"
    android:orientation="horizontal">

    <EditText
      android:id="@+id/rst_verify_code"
      android:layout_width="wrap_content"
      android:layout_height="match_parent"
      android:layout_weight="1"
      android:inputType="number"
      android:hint="@string/rst_verify_code"
      android:textSize="16sp"
      android:textColor="@color/black"
      android:singleLine="true"
      android:background="@drawable/shape_form"
      android:textCursorDrawable="@drawable/text_cursor" />

    <TextView
      android:id="@+id/rst_send_code"
      android:layout_width="130dp"
      android:layout_height="match_parent"
      android:text="@string/rst_send_code"
      android:textSize="13sp"
      android:textColor="@color/white"
      android:gravity="center"
      android:layout_marginLeft="10dp"
      android:background="@drawable/shape_verify_btn_normal"/>

  </LinearLayout>

  <Button
    android:id="@+id/rst_next_step"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:layout_margin="30dp"
    android:text="@string/rst_next_step"
    android:textSize="15sp"
    android:textColor="@color/white"
    android:background="@drawable/shape_btn"/>

</LinearLayout>

// 发送成功进入倒计时
countDownTimer = new CountDownTimerUtils(tv_send_code, 60000, 1000);
countDownTimer.start();