How does Android change the format of some text in the EditText control

When we use the EditText control, we will encounter such a problem. When I input, when I choose to make the text thicker, the text I input will become thicker. When I remove the selection and input the text again, the text is normal.

In this case, people generally think it is very simple. There is a settypeface method in EditText. Just use Edit_ temp.setTypeface(Typeface.defaultFromStyle(Typeface.NORMAL)); That's it. But here comes the problem. This method changes the format of all text in EditText. But the format I want is like this: normal format, thicker format, normal format

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