如何获得类似于 Facebook 应用程序的 MultiAutoCompl-移动开发问题

How do I get MultiAutoCompleteTextView tokenizer similar to Facebook app?(如何获得类似于 Facebook 应用程序的 MultiAutoCompleteTextView 标记器?)

本文介绍了如何获得类似于 Facebook 应用程序的 MultiAutoCompleteTextView 标记器?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

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

I am creating an application which has a 'To' field just like in Facebook app's "New Message" feature.

从下拉列表中选择一个项目后，我创建一个图像跨度并将其添加到 MultiAutoCompleteTextView.我为这个视图使用了 SpaceTokenizer .问题是当我单击退格时，光标首先移动到空白处(即空格 Tokenizer)，然后当我再次单击退格时，整个单词被删除....我想在我第一次单击退格时删除整个单词，就像 facebook 应用程序一样...

After selecting an item from the drop down list, I create an imagespan and add it to the MultiAutoCompleteTextView. I have used SpaceTokenizer for this view . The problem is when I click on backspace, the cursor first moves to the empty space (i.e., space Tokenizer) and then when I click on the backspace again, the whole word gets deleted....I want to delete the whole word on my first click of backspace just like facebook app...

这是我的 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) == '
') {
            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) == '
') {
                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) == '
') {
            i--;
        }

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

我正在使用此代码在我的 multi-ContentText 中创建一个 TextView

I am using this code to create a TextView in my multi-ContentText

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());

我不确定空格 Tokenizer 是否是此类行为的正确选择...任何帮助或指针将不胜感激...

I am not sure whether the space Tokenizer is the right option for this type of behavior...Any help or pointers will be grateful...

这里是截图以便更好地理解......

Here is the screenshot for better understanding....

我有一个文本，后跟一个空格，然后是一个光标...如果我按退格键，它首先会移动到空白处，只有当我再次按退格键时，整个文本才会被删除....

I have a text followed by a space and then a cursor...If I hit backspace, it first moves to the empty space and only when I hit backspace again the whole text is deleted....

这是另一个截图..

这里的光标并不完全位于两个 TextView 之间，这与 facebook 应用程序不同，这再次导致插入文本时出现一些问题...

Here the cursor is not exactly in between the two TextViews unlike in facebook app which again causes some issues in inserting the text...

推荐答案

找到解决方案....

将此文本观察器添加到多自动完成文本视图

Add this textwatcher to the 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,"");
                               }
                            }
                        }                      
                }               

    }
};