Some Question of imageview position

public class MainActivity extends Activity {
	
    RelativeLayout rl= (RelativeLayout) findViewById(R.id.imageView5);;
    ImageView iv;
    RelativeLayout.LayoutParams params;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        onClickBtn();
        
        int yellow_iv_id = 123; // Some arbitrary ID value.

        iv = new ImageView(this);
        iv.setId(yellow_iv_id);
        iv.setBackgroundColor(Color.YELLOW);
        params = new RelativeLayout.LayoutParams(30, 40);
        params.leftMargin = 50;
        params.topMargin = 60;
        rl.addView(iv, params);

        iv = new ImageView(this);
        iv.setBackgroundColor(Color.RED);
        params = new RelativeLayout.LayoutParams(30, 40);
        params.leftMargin = 80;
        params.topMargin = 90;

        // This line defines how params.leftMargin and params.topMargin are interpreted.
        // In this case, "<80,90>" means <80,90> to the right of the yellow ImageView.
        params.addRule(RelativeLayout.RIGHT_OF, yellow_iv_id);

        rl.addView(iv, params);
        
    }
/*
	public void onClickBtn(){
    		Button btn1=(Button)findViewById(R.id.button1);
    
  	  	btn1.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
				TextView textView=(TextView)findViewById(R.id.textView1);
				textView.setText("Go to postion A");
			}
    	});
    }*/
}