/**
 * 點擊獲取驗證碼，10S倒計時，利用Rxjava進行線程切換
 * @param view
 */
 public void getSureCode(View view) {
 Observable.create(new ObservableOnSubscribe<Integer>() {
  @Override
  public void subscribe(ObservableEmitter<Integer> emitter) throws Exception {
  int i = 10;
  while (i >= 0) {
   try {
   Thread.sleep(1000);
   emitter.onNext(i);
   } catch (InterruptedException e) {
   e.printStackTrace();
   }
   i--;
  }
  emitter.onComplete();
  }
 }).subscribeOn(Schedulers.io())// 此方法為上面發(fā)出事件設(shè)置線程為IO線程
  .observeOn(AndroidSchedulers.mainThread())// 為消耗事件設(shè)置線程為UI線程
  .subscribe(new Consumer<Integer>() {
   @Override
   public void accept(Integer integer) throws Exception {
   bindingView.countDownTv.setClickable(integer > 0 ? false : true);
   bindingView.countDownTv.setBackground(integer > 0 ? getResources().getDrawable(R.drawable.rectangle_gray_bg) : getResources().getDrawable(R.drawable.rectangle_red_bg));
   if(integer > 0) {
    String content = integer + "秒后可重新發(fā)送";
    SpannableString span = new SpannableString(content);
    int index = content.indexOf("后");
    span.setSpan(new ForegroundColorSpan(getResources().getColor(R.color.colorTheme)), 0, index, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); //設(shè)置前景色為紅色
    bindingView.countDownTv.setText(span);
   } else {
    bindingView.countDownTv.setText(getString(R.string.get_check_code));
   }
   }
  });
 }

<layout xmlns:android="http://schemas.android.com/apk/res/android">

 <LinearLayout xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context="com.smilexie.countdownwithrxjava.MainActivity">

 <TextView
  android:id="@+id/count_down_tv"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_margin="10dp"
  android:gravity="center"
  android:layout_gravity="center_vertical"
  android:padding="8dp"
  android:background="@drawable/rectangle_red_bg"
  android:text="@string/get_check_code"
  android:textSize="14sp"
  android:textColor="@color/white"
  android:onClick="getSureCode"/>

 </LinearLayout>
</layout>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle">
 <!-- 填充顏色 -->
 <solid android:color="@color/colorLineItem"></solid>
 <!-- 線的寬度，顏色灰色 -->
 <stroke android:width="1dp" android:color="@color/colorLineItem"></stroke>
 <!-- 矩形的圓角半徑 -->
 <corners android:radius="5dp" />
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle">
 <!-- 填充顏色 -->
 <solid android:color="@color/colorTheme"></solid>
 <!-- 線的寬度，顏色灰色 -->
 <stroke android:width="1dp" android:color="@color/colorTheme"></stroke>
 <!-- 矩形的圓角半徑 -->
 <corners android:radius="5dp" />
</shape>

<color name="colorLineItem">#FFDDDDDD</color>
<color name="colorTheme">#f64a33</color>