如何在android系统上MultiAutoCompleteTextView插入@符号，只有当显示下拉 [英] How to show dropdown only when inserting @ character on MultiAutoCompleteTextView in android

问题描述

我有一个 MultiAutoCompleteTextView 。它工作正常。但我想说明建议下拉列表，只有当它的用户类型@（比如标记用户的Facebook应用程序）。我不知道该怎么做。这里是我的code：

  mChatbox =（MultiAutoCompleteTextView）findViewById（R.id.chatbox）;ArrayAdapter＆LT;串GT;适配器=新ArrayAdapter＆LT;串GT;（这一点，android.R.layout.simple_dropdown_item_1line，用户列表）;
mChatBox.setAdapter（适配器）;
mChatBox.setTokenizer（新SpaceTokenizer（））;公共类SpaceTokenizer实现MultiAutoCompleteTextView.Tokenizer {公众诠释findTokenStart（CharSequence的文字，INT光标）{
    INT I =光标;
    而（ⅰ大于0＆放大器;＆放大器;！text.charAt（I  -  1）=''）{
        一世 - ;
    }
    而（ⅰ＆所述;光标＆放大器;＆放大器; text.charAt（ⅰ）==''）{
        我++;
    }
    返回我;
}公众诠释findTokenEnd（CharSequence的文字，INT光标）{
    INT I =光标;
    INT LEN = text.length（）;    而（I＆LT; LEN）{
        如果（text.charAt（ⅰ）==''）{
            返回我;
        }其他{
            我++;
        }
    }    返回LEN;
}公众的CharSequence terminateToken（CharSequence的文字）{
    INT I = text.length（）;    而（ⅰ大于0＆放大器;＆放大器; text.charAt（I  -  1）==''）{
        一世 - ;
    }    如果（ⅰ大于0＆放大器;＆放大器; text.charAt（I  -  1）==''）{
        返回文本;
    }其他{
        如果（文本的instanceof跨区）{
            SpannableString SP =新SpannableString（文字+）;
            TextUtils.copySpansFrom（（跨区）文字，0，text.length（）
                    Object.class，SP，0）;
            返回SP;
        }其他{
            返回文字+;
        }
    }
}
 

解决方案

我有我自己的解决方案。我创建它扩展自定义视图 MultiAutoCompleteTextView 并重写 performFiltering 在里面。检查第一个字符是@，那么后过滤下一字符。否则，用*代替字符以避免过滤。这里是我的code。

  @覆盖
保护无效performFiltering（CharSequence的文字，诠释开始，诠释年底，INT键code）{
    如果（text.charAt（开始）=='@'）{
        开始=开始+ 1;
    }其他{
        文字= text.subSequence（0开始）;
        的for（int i =启动; I＆LT; END;我++）{
               文本=文本+*;
        }
    }
    super.performFiltering（文字，开始，结束，重点code）;
}
 

I have a MultiAutoCompleteTextView. It works fine. But I want to show suggestion dropdown only when user type @ on it (like tagging user in facebook app). I have no idea how to do it. Here is my code :

mChatbox = (MultiAutoCompleteTextView) findViewById(R.id.chatbox);

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line, userList);
mChatBox.setAdapter(adapter);
mChatBox.setTokenizer(new SpaceTokenizer());

public class SpaceTokenizer implements MultiAutoCompleteTextView.Tokenizer {

public int findTokenStart(CharSequence text, int cursor) {
    int i = cursor;
    while (i > 0 && text.charAt(i - 1) != ' ') {
        i--;
    }
    while (i < cursor && text.charAt(i) == ' ') {
        i++;
    }
    return i;
}

public int findTokenEnd(CharSequence text, int cursor) {
    int i = cursor;
    int len = text.length();

    while (i < len) {
        if (text.charAt(i) == ' ') {
            return i;
        } else {
            i++;
        }
    }

    return len;
}

public CharSequence terminateToken(CharSequence text) {
    int i = text.length();

    while (i > 0 && text.charAt(i - 1) == ' ') {
        i--;
    }

    if (i > 0 && text.charAt(i - 1) == ' ') {
        return text;
    } else {
        if (text instanceof Spanned) {
            SpannableString sp = new SpannableString(text + " ");
            TextUtils.copySpansFrom((Spanned) text, 0, text.length(),
                    Object.class, sp, 0);
            return sp;
        } else {
            return text + " ";
        }
    }
}

解决方案

I got a solution by myself. I create custom view which extends MultiAutoCompleteTextView and override performFiltering in it. Check if first char is "@", then filter the next chars after it. Otherwise, replace chars with "*" to avoid filtering. Here is my code.

@Override
protected void performFiltering(CharSequence text, int start, int end, int keyCode) {
    if (text.charAt(start) == '@') {
        start = start + 1;
    } else {
        text = text.subSequence(0, start);
        for (int i = start; i < end; i++) {
               text = text + "*";
        }
    }
    super.performFiltering(text, start, end, keyCode);
}

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