android中改变dialog的显示的位置和大小

private void setDialogSize(Dialog dg) {

Window dialogWindow = dg.getWindow();
WindowManager.LayoutParams lp = dialogWindow.getAttributes();
dialogWindow.clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
dialogWindow.setGravity(Gravity.LEFT | Gravity.TOP);
//显示的坐标
lp.x = 150;
lp.y = 50;
int width = getResources().getDimensionPixelOffset(R.dimen.d_width);
int height = getResources().getDimensionPixelOffset(R.dimen.d_height);
//dialog的大小
lp.width = width;
lp.height = height;


dialogWindow.setAttributes(lp);


}