EditText request focus - EditText request focus

problem ：

I am designing a login page as: I am designing a login page ：

UserName:  .....Password:  .....     LoginButton

When the activity starts, I want the focus to go to "UserName" textbox and the keyboard to appear. When the activity starts , I want to focus on “ user name ” Text box and display keyboard .

I am using the following code: I am using the following code ：

    boolean checkFocus=user.requestFocus();    Log.i("CheckFocus", ""+checkFocus);    if(checkFocus==true)    {    InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);    mgr.showSoftInput(user, InputMethodManager.SHOW_IMPLICIT);    }

I don't understand where to write this code to make the keyboard appear when the activity starts and focus is on the "UserName" editText box. I don't know where to write this code so that the keyboard appears at the beginning of the activity and the focus is “ user name ”editText On the frame .Can anyone please guide me? Can anyone guide me ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/XtON