Android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();