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类似新浪微博的EditText,可@某人,#插入话题,表情等。(欢迎大家STAR)

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

###实现思路

  1. 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);
    
  2. 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;
         }
     });
    
  3. 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);
         }
     }}
    

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类似新浪微博的EditText,可@某人,#插入话题,表情等。(欢迎大家STAR)

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