##RichEditor 类似新浪微博EditText，可@某人，#插入话题，表情。

###实现思路

在光标处插入特殊字符

 //将特殊字符插入到EditText 中显示
 int index = getSelectionStart();//光标位置
 Editable editable = getText();//原先内容
 SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder(editable);
 Spanned htmlText = Html.fromHtml(String.format(String.format("<font color='%s'>" + insertContent + "</font>", insertColor)));
 spannableStringBuilder.insert(index, htmlText);
 spannableStringBuilder.insert(index + htmlText.length(), "\b");
 setText(spannableStringBuilder);
 setSelection(index + htmlText.length() + 1);

实现特殊字符选中删除效果

 /**
  * 监听删除键 <br/>
  * 1.光标在话题后面,将整个话题内容删除 <br/>
  * 2.光标在普通文字后面,删除一个字符
  *
  */
 this.setOnKeyListener(new View.OnKeyListener() {
     @Override
     public boolean onKey(View v, int keyCode, KeyEvent event) {
         if (keyCode == KeyEvent.KEYCODE_DEL && event.getAction() == KeyEvent.ACTION_DOWN) {

             int selectionStart = getSelectionStart();
             int selectionEnd = getSelectionEnd();

             /**
              * 如果光标起始和结束不在同一位置,删除文本
              */
             if (selectionStart != selectionEnd) {
                 // 查询文本是否属于目标对象,若是移除列表数据
                 String tagetText = getText().toString().substring(
                         selectionStart, selectionEnd);
                 for (int i = 0; i < insertModelList.size(); i++) {
                     InsertModel object = insertModelList.get(i);
                     if (tagetText.equals(object.getInsertContent())) {
                         insertModelList.remove(object);
                     }
                 }
                 return false;
             }


             int lastPos = 0;
             Editable editable = getText();
             // 遍历判断光标的位置
             for (int i = 0; i < insertModelList.size(); i++) {
                 String objectText = insertModelList.get(i).getInsertContent();
                 lastPos = getText().toString().indexOf(objectText, lastPos);
                 if (lastPos != -1) {
                     if (selectionStart != 0 && selectionStart >= lastPos && selectionStart <= (lastPos + objectText.length())) {
                         // 选中话题
                         setSelection(lastPos, lastPos + objectText.length());
                         // 设置背景色
                         editable.setSpan(new BackgroundColorSpan(BACKGROUND_COLOR), lastPos, lastPos + objectText.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                         return true;
                     }
                 }
                 lastPos += objectText.length();
             }
         }

         return false;
     }
 });

设置点击特殊字符光标自动移动到特殊字符之后

 /**
  * 监听光标的位置,若光标处于话题内容中间则移动光标到话题结束位置
  *
  */
 @Override
 protected void onSelectionChanged(int selStart, int selEnd) {
 super.onSelectionChanged(selStart, selEnd);
 if (insertModelList == null || insertModelList.size() == 0)
     return;
 int startPostion = 0;
 int endPostion = 0;
 String insertContent = "";
 for (int i = 0; i < insertModelList.size(); i++) {
     insertContent = insertModelList.get(i).getInsertContent();
     startPostion = getText().toString().indexOf(insertContent);
     endPostion = startPostion + insertContent.length();
     if (startPostion != -1 && selStart > startPostion
             && selStart <= endPostion) {// 若光标处于话题内容中间则移动光标到话题结束位置
         setSelection(endPostion);
     }
 }}

change9326/RichEditor

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