How to detect Gravity of XML item

What is the correct way to detect the gravity flags used for an XML item? I'm trying to achieve the following:

1. If the gravity of my TableLayout (myTbl) is set to Gravity.TOP, then I want the gravity to be set to Gravity.CENTER_VERTICAL
2. Else if the gravity of my TableLayout (myTbl) is set to Gravity.CENTER_VERTICAL, then I want the gravity to be set to Gravity.BOTTOM

---

private Button myBtn;
private TableLayout myTbl;

public void btn_click(View view) {
    if (myTbl.getGravity() == Gravity.TOP) {
        myTbl.setGravity(Gravity.CENTER_VERTICAL);
    } else if (myTbl.getGravity() == Gravity.CENTER_VERTICAL) {
        tblMain.setGravity(Gravity.BOTTOM);
    }
}

I tried using getGravity() but API 24+ is required, which is not what I want.The API used in my project is lower than 24.