Arkar Aung Arkar Aung - 2 months ago 20
Android Question

How to show dropdown only when inserting @ character on MultiAutoCompleteTextView in android

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 + " ";
}
}
}

Answer

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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