Toast 的显示位置能不能修改？
默认是在屏幕的下方，我想移到屏幕的上方。
[解决办法]
toast.setGravity(Gravity.TOP
[解决办法]
Gravity.CENTER_HORIZONTAL,0,0);
[解决办法]
参考接口：
public void setGravity (int gravity, int xOffset, int yOffset)
Added in API level 1

Set the location at which the notification should appear on the screen.
See Also
Gravity