Java/android noob, passing variables to function

[1101]

Okay so I'm VERY new to java and I'm trying to make a very simple android program. Basically I have a function, it will take in two integers and then display their product. But I don't think I'm passing the variables to the function correctly. Also I'm probably not converting the numbers to strings the right way (there doesn't appear to be a string datatype in standard java so i need some sort of library or something i assume).

Anyways here's the code

package com.muc.whatever;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class helloagain extends Activity 
{
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        FUNCTION_1(3,4);
    }
    public void FUNCTION_1(int A,int B)
    {
        setContentView(R.layout.main);
        TextView tv = new TextView(this);
        tv.setText(A*B);
        setContentView(tv);
    }
}