EditText即时搜索，可限定时间工具类

  想必即时搜索大家都做过，一般都监听EditText字符串改变或者SearchView来实现。但有时候，我们不想让它

输入一个字符就请求一次，删除一个字符也请求一次，那样太频繁了那有什么好方法可以实现让它输入后过一秒（或

者自定义时间）再搜索吗？下面这个工具类可以帮到你。

public class RealTimeSearchUtil {
          
   
    private static ScheduledExecutorService scheduledExecutor = Executors.newScheduledThreadPool(10);
    private static RealTimeSearchUtilLisetener mRealTimeSearchUtilLisetener;
    private static MyHandler handler = new MyHandler();

    /**
     * 实时搜索数据，通过RealTimeSearchUtilLisetener接口操作
     * @param newText 搜索的字符串
     * @param time  过多久搜索 
     * @param realTimeSearchUtilLisetener
     */
    public static void sendRealTimeSearchMessage(String newText,int time, RealTimeSearchUtilLisetener realTimeSearchUtilLisetener){
        showSearchTip(newText,time);
        mRealTimeSearchUtilLisetener = realTimeSearchUtilLisetener;
    }

    public static void showSearchTip(String newText,int time) {

        schedule(new SearchTipThread(newText), time);
    }

    public static ScheduledFuture<?> schedule(Runnable command, long delayTimeMills) {
        return scheduledExecutor.schedule(command, delayTimeMills, TimeUnit.MILLISECONDS);
    }

    private static class SearchTipThread implements Runnable {
          
   

        String newText;

        protected SearchTipThread(String newText) {
            this.newText = newText;
        }

        @Override
        public void run() {
            // keep only one thread to load current search tip, you can get data from network here
            boolean flag = newText != null && newText.length() > 0;
            if (flag) {
                handler.sendMessage(handler.obtainMessage(1));//不能在子线程中在开启一个子线程
            }
        }
    }

    private static class MyHandler extends Handler {
          
   

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 1:
                    mRealTimeSearchUtilLisetener.handleUIMessage();
                    break;
            }
        }
    }

    public interface RealTimeSearchUtilLisetener{
          
   
        /**
         * 此方法在主线程中执行，可以发送网络请求数据
         */
        void handleUIMessage();
    }
}

  如何使用？

etSearch.addTextChangedListener(textWatcher);

public TextWatcher textWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(final CharSequence s, int start, int before, int count) {

                RealTimeSearchUtil.sendRealTimeSearchMessage(s.toString(),500, new RealTimeSearchUtil.RealTimeSearchUtilLisetener() {
                    @Override
                    public void handleUIMessage() {
                      //发起请求
                    }
                });
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    };

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