問(wèn)題描述

我正在使用 EditText 控件過(guò)濾我的列表.我想在用戶完成 EditText 輸入后 0.5 秒過(guò)濾列表.為此，我使用了 TextWatcher 的 afterTextChanged 事件.但是這個(gè)事件會(huì)隨著 EditText 中每個(gè)字符的變化而上升.

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.

我該怎么辦?

推薦答案

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
            );
        }
    }
);

訣竅在于每次 EditText 中的文本發(fā)生更改時(shí)取消和重新安排 Timer.

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

關(guān)于設(shè)置延遲多長(zhǎng)時(shí)間，請(qǐng)參閱這篇文章.

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

這篇關(guān)于如何在 EditText 控件中的文本更改后 0.5 秒執(zhí)行某些操作?的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！