如果EditText为空，或者光标已经顶在了editText的最前面，

如果EditText为空，或者光标已经顶在了editText的最前面，则直接插入图片，并且EditText下移即可

Results (English) 1:

If the EditText is empty, or the cursor is already at the beginning editText, insert pictures directly and EditText down

Results (English) 2:

If EditText is empty or if the cursor is already at the top of the editText foremost, then directly into the picture, and down to EditText

Results (English) 3:

If the EditText is empty, or the cursor has been on top of the editText in the front, then directly into the picture, and EditText down to