android studio make toast appear at top of screen

1 Toast toast = Toast.makeText(test.this,"bbb", Toast.LENGTH_LONG);
2 toast.setGravity(Gravity.CENTER, 0, 0);
3 toast.show();
4

1Toast toast= Toast.makeText(getApplicationContext(), 
2"Your string here", Toast.LENGTH_SHORT);  
3toast.setGravity(Gravity.TOP|Gravity.CENTER_HORIZONTAL, 0, 0);
4toast.show();
5

1// v is the Button view that you want the Toast to appear above 
2// and messageId is the id of your string resource for the message
3
4private void displayToastAboveButton(View v, int messageId)
5{
6    int xOffset = 0;
7    int yOffset = 0;
8    Rect gvr = new Rect();
9
10    View parent = (View) v.getParent(); 
11    int parentHeight = parent.getHeight();
12
13    if (v.getGlobalVisibleRect(gvr)) 
14    {       
15        View root = v.getRootView();
16
17        int halfWidth = root.getRight() / 2;
18        int halfHeight = root.getBottom() / 2;
19
20        int parentCenterX = ((gvr.right - gvr.left) / 2) + gvr.left;
21
22        int parentCenterY = ((gvr.bottom - gvr.top) / 2) + gvr.top;
23
24        if (parentCenterY <= halfHeight) 
25        {
26            yOffset = -(halfHeight - parentCenterY) - parentHeight;
27        }
28        else 
29        {
30            yOffset = (parentCenterY - halfHeight) - parentHeight;
31        }
32
33        if (parentCenterX < halfWidth) 
34        {         
35            xOffset = -(halfWidth - parentCenterX);     
36        }   
37
38        if (parentCenterX >= halfWidth) 
39        {
40            xOffset = parentCenterX - halfWidth;
41        }  
42    }
43
44    Toast toast = Toast.makeText(getActivity(), messageId, Toast.LENGTH_SHORT);
45    toast.setGravity(Gravity.CENTER, xOffset, yOffset);
46    toast.show();       
47}
48