如何获得类似于Facebook应用程序的MultiAutoCompleteTextView标记器？

Question

我正在创建一个具有"To"字段的应用程序,就像Facebook应用程序的"新消息"功能一样.

从下拉列表中选择一个项目后,我创建了一个imagespan并将其添加到MultiAutoCompleteTextView.我已经习惯SpaceTokenizer了这个观点.问题是,当我点击退格键时,光标首先移动到空白区域(即空格Tokenizer),然后当我再次点击退格键时,整个单词被删除....我想删除我的整个单词第一次点击退格就像facebook app一样...

这是我的代码 SpaceTokenizer

     multiContentText.setTokenizer(new Tokenizer(){
     public int findTokenStart(CharSequence text, int      cursor) {
        int i = cursor;
        if(i>0){
            Log.d("textchar ",""+text.charAt(i - 1));
        }

        while (i > 0 && text.charAt(i - 1) != ' ') {
            i--;
        }
        while (i < cursor && text.charAt(i) == ' ' || text.charAt(i - 1) == '\n') {
            i++;
        }

        return i;
    }

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

        while (i < len) {
            if (text.charAt(i) == ' ' || text.charAt(i - 1) == '\n') {
                return i;
            } else {
                i++;
            }
        }

        return len;
    }

    public CharSequence terminateToken(CharSequence text) {
        int i = text.length();
        while (i > 0 && text.charAt(i - 1) == ' ' || text.charAt(i - 1) == '\n') {
            i--;
        }

        if (i > 0 && text.charAt(i - 1) == ' ' || text.charAt(i - 1) == '\n') {
            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+" ";
            }
        }
    }
});

我正在使用此代码TextView在我的多ContentText中创建一个

SpannableStringBuilder ssb = new SpannableStringBuilder(multiContentText.getText());
String c="text from the list";
TextView textView = (TextView) inflater.inflate(R.layout.chips_edittext, null);
textView.setText(c); // set text
int spec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
textView.measure(spec, spec);
textView.layout(0, 0, textView.getMeasuredWidth(), textView.getMeasuredHeight());
Bitmap b = Bitmap.createBitmap(textView.getWidth(), textView.getHeight(),Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(b);
canvas.translate(-textView.getScrollX(), -textView.getScrollY());
textView.draw(canvas);
textView.setDrawingCacheEnabled(true);
Bitmap cacheBmp = textView.getDrawingCache();
Bitmap viewBmp = cacheBmp.copy(Bitmap.Config.ARGB_8888, true); 
textView.destroyDrawingCache();  // destory drawable
// create bitmap drawable for imagespan
BitmapDrawable bmpDrawable = new BitmapDrawable(viewBmp);               
bmpDrawable.setBounds(0, 0,bmpDrawable.getIntrinsicWidth(),bmpDrawable.getIntrinsicHeight());
// create and set imagespan 
ssb.setSpan(new ImageSpan(bmpDrawable),0 ,c.length() , Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// set chips span 
multiContentText.setText(ssb);      
multiContentText.setSelection(multiContentText.getText().length());

我不确定这个空间是否Tokenizer适合这种行为......任何帮助或指示都会感激不尽......

这是更好理解的截图....

我有一个文本,后跟一个空格,然后是一个光标......如果我按下退格键,它首先会移动到空白区域,只有当我再次点击退格键时,整个文本才被删除....

这是另一个截图..

这里的光标不完全在两个TextViews 之间,不像在facebook应用程序中,这再次导致插入文本时出现一些问题......

Answer 1

找到解决方案....

将此textwatcher添加到multiautocompletetextview

private TextWatcher textWather = new TextWatcher() {
    int noOfCharAdded=0;int noOfCharDeleted=0;
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        startIdx=start;
    }
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,int after) {
        noOfCharAdded=after;
        noOfCharDeleted=count;
    }
    @Override
    public void afterTextChanged(Editable s) {
        Editable buffer = s;
        int start = multiContentText.getSelectionStart()<0?0:multiContentText.getSelectionStart();
        int end = multiContentText.getSelectionEnd()<0?0:multiContentText.getSelectionEnd();
                if(noOfCharAdded==0 && noOfCharDeleted==1){ //if space is deleted
                        if (start == end && delPrevText) {                          
                            ImageSpan link[] = buffer.getSpans(start, end,ImageSpan.class);
                            if (link.length > 0) {                                  
                                buffer.replace(buffer.getSpanStart(link[0]),buffer.getSpanEnd(link[0]),"");
                                buffer.removeSpan(link[0]);
                            }
                        }
                        delPrevText=true; 
                        multiContentText.setSelection(multiContentText.getText().length());
                }
                else if(noOfCharAdded==0 && noOfCharDeleted>1){//if the whole word is deleted
                        if(buffer.length()>0){                                           
                            if(start<buffer.length()){
                               delPrevText=false;                                  
                               if(buffer.charAt(start)==' '){                                       
                                  buffer.replace(start,start+1,"");
                               }
                            }
                        }                      
                }               

    }
};