如何在 EditText 控件中的文本更改后 0.5 秒执行某些操作?

问题描述

我正在使用 EditText 控件过滤我的列表.我想在用户完成 EditText 输入后 0.5 秒过滤列表.为此，我使用了 TextWatcher 的 afterTextChanged 事件.但是这个事件会随着 EditText 中每个字符的变化而上升.

I am filtering my list using an EditText control. I want to filter the list 0.5 seconds after the user has finished typing in EditText. I used the afterTextChanged event of TextWatcher for this purpose. But this event rises for each character changes in EditText.

我该怎么办?

推荐答案

使用:

editText.addTextChangedListener(
    new TextWatcher() {
        @Override public void onTextChanged(CharSequence s, int start, int before, int count) { }
        @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { }

        private Timer timer = new Timer();
        private final long DELAY = 1000; // Milliseconds

        @Override
        public void afterTextChanged(final Editable s) {
            timer.cancel();
            timer = new Timer();
            timer.schedule(
                new TimerTask() {
                    @Override
                    public void run() {
                        // TODO: Do what you need here (refresh list).
                        // You will probably need to use
                        // runOnUiThread(Runnable action) for some
                        // specific actions (e.g., manipulating views).
                    }
                },
                DELAY
            );
        }
    }
);

诀窍在于每次 EditText 中的文本发生更改时取消和重新安排 Timer.

The trick is in canceling and rescheduling Timer each time, when text in EditText gets changed.

关于设置延迟多长时间，请参阅这篇文章.

For how long to set the delay, see this post.

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