Android ถ้าต้องการเปลี่ยนหน้า XML จากข้อมูลฝั่ง Java ทำยังไงครับ

public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.dynamically_create_view_element);
         
        final LinearLayout lm = (LinearLayout) findViewById(R.id.linearMain);
         
        // create the layout params that will be used to define how your
        // button will be displayed
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
         
        //Create four 
        for(int j=0;j<=4;j++) 
        {   
            // Create LinearLayout
            LinearLayout ll = new LinearLayout(this);
            ll.setOrientation(LinearLayout.HORIZONTAL);
             
            // Create TextView
            TextView product = new TextView(this);
            product.setText(" Product"+j+"    ");
            ll.addView(product);
             
            // Create TextView
            TextView price = new TextView(this);
            price.setText("  $"+j+"     ");
            ll.addView(price);
             
            // Create Button
            final Button btn = new Button(this);
                // Give button an ID
                btn.setId(j+1);
                btn.setText("Add To Cart");
                // set the layoutParams on the button
                btn.setLayoutParams(params);
                 
                final int index = j;
                // Set click listener for button
                btn.setOnClickListener(new OnClickListener() {
                    public void onClick(View v) {
                         
                        Log.i("TAG", "index :" + index);
                         
                        Toast.makeText(getApplicationContext(), 
                                "Clicked Button Index :" + index, 
                                Toast.LENGTH_LONG).show();
                         
                    }
                });
                 
               //Add button to LinearLayout
                ll.addView(btn);
               //Add button to LinearLayout defined in XML
                lm.addView(ll);  
        }
    }
}