제가 토스트 자체의 위치를 바꿔본 적은 없습니다만, 설명을 보면 setGravity로 이동가능하다고 나오는데요.
구글 디벨로퍼의 설명 부분 퍼왔습니다.
Positioning your Toast
A standard toast notification appears near the bottom of the screen, centered horizontally. You can change this position with the setGravity(int, int, int) method. This accepts three parameters: a Gravity constant, an x-position offset, and a y-position offset.
For example, if you decide that the toast should appear in the top-left corner, you can set the gravity like this:
toast.setGravity(Gravity.TOP|Gravity.LEFT, 0, 0);
If you want to nudge the position to the right, increase the value of the second parameter. To nudge it down, increase the value of the last parameter.
