placing an image in activity background (with another image)

I'm working on this app, which basically displays an image and some text. background looks like this http://ift.tt/1Jlq2ml

Now,I have literally set the background of my activity as this image. And I want to implement a function where I can click a button and some stored image would be imported and placed and fit in the WHITE space, and also display some text in the BLACK space.

Any ideas how I would do that ?

package self.name.firstandroidprogram;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.TextView;

public class Class2 extends Activity {

    LinearLayout layout1;
    TextView text1;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        layout1 = new LinearLayout(this);
        text1 = new TextView(this);

        text1.setText("RedNet");

        layout1.setBackgroundResource(R.drawable.rn);


        layout1.addView(text1);

        setContentView(layout1);
    }

}

And here is my xml

  <RelativeLayout xmlns:android="http://ift.tt/nIICcg"
        xmlns:tools="http://ift.tt/LrGmb4"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="self.name.firstandroidprogram.Class2" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/hello_world" />



    </RelativeLayout>