等到用户停止输入后，再在searchview中执行大量搜索 [英] Wait until the user stops typing before executing a heavy search in searchview

问题描述

搜索在我的应用程序中处于中心位置，我需要它能够正常运行.现在我有一个SearchView.我需要内联显示结果，所以我正在使用此代码.

Search is central in my app and I need it to work well. Right now I have a SearchView. I need to display the results inline, so I'm using this code.

    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            srl.setVisibility(View.GONE);
            return false;
        }

        @Override
        public boolean onQueryTextChange(String query) {
            currentQuery = query;
            if (query.length()>= 3) {
                searchFor(currentQuery);
            } else {
                srl.setVisibility(View.GONE);
            }
            return false;
        }
    });

问题可能很明显.因为我使用的是Firebase，所以我的searchFor()函数非常繁琐，不需要每个字母都执行它.这不仅破坏了用户体验，而且如果您写下更长的单词，有时甚至会使我的应用程序崩溃.

The problem may be obvious. Because I use firebase, my searchFor() function is rather heavy and I don't need it to be executed for every single letter. This not only destroys the user experience, it sometimes literally crashes my app if you write down longer words.

我想要的是在用户停止输入时进行搜索.我想我需要有一个将其延迟一秒的处理程序，然后在每次按下字母键并设置一个新的按键时取消该处理程序.从理论上讲，这是有道理的.我只是无法自己将其用于searchView.

What I want is to search when the user stops typing. I guess I need to have a handler that delays it by a second and then cancel that handler everytime a letter key is pressed and set a new one. This theoretically makes sense. I just haven't been able to pull this off myself for a searchView.

我们将不胜感激！

推荐答案

最简单的方法是 RxJava的 去抖动运算符.

The easiest way to achieve that is RxJava's debounce operator.

结合杰克·沃顿(Jake Wharton)的 RxBinding ，您将得到类似以下的结果:

With combination of Jake Wharton's RxBinding you'll end up with something like this:

RxSearchView.queryTextChanges(searchView)
        .debounce(1, TimeUnit.SECONDS) // stream will go down after 1 second inactivity of user
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(new Consumer<CharSequence>() {
            @Override
            public void accept(@NonNull CharSequence charSequence) throws Exception {
                // perform necessary operation with `charSequence`
            }
        });

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