Android中TextView输入字数统计和限制
　　??????????????? selectionStart = content.getSelectionStart();
　　??????????????? selectionEnd = content.getSelectionEnd();
　　????????????????if (temp.length() > num) {
　　??????????????????? s.delete(selectionStart - 1, selectionEnd);
　　??????????????????? int tempSelection = selectionEnd;
　　??????????????????? content.setText(s);
　　??????????????????? content.setSelection(tempSelection);//设置光标在最后
　　??????????????? }
　　??????????? }
　　???});