How to place an image over another one on android app

FrameLayout rv =(FrameLayout)findViewById(R.id.my_ph);


    ImageView im1 = new ImageView(this);
    im1.setBackgroundResource(R.drawable.lamp_on);
    im1.layout(100, 100,120, 120);

    rv.addView(im1);

<FrameLayout android:id="@+id/my_ph" xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/sketch" />
</FrameLayout>

FrameLayout android:id="@+id/my_ph"  
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
    android:id="@+id/image"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/sketch" android:layout_alignParentTop="true"/>
<ImageView
    android:id="@+id/image2"
    android:layout_width="fill_parent"
    android:layout_height="fill_paren"
    android:layout_alignTop="@id/image"
    android:layout_alignLeft="@id/image"
    android:layout_alignRight="@id/image"
    android:layout_alignBottomp="@id/image"
    android:visibility="INVISIBLE"/>
</FrameLayout>

ImageView image2 =(ImageView)findViewById(R.id.image2);
image2.setVisibility(View.VISIBLE);
image2.setImageResource(R.drawable.my_image);

RelativeLayout rv = (RelativeLayout) findViewById(R.id.my_ph);
 RelativeLayout.LayoutParams params;
 ImageButton im1 = new ImageButton(this);

 im1.setBackgroundResource(R.drawable.lamp);
 im1.setId(i);
 im1.setOnClickListener(new OnClickListener() {
     public void onClick(View v) {
    TextView tx = (TextView) findViewById(R.id.textView1);
    tx.setText("lamp #" + v.getId());
}
 });

 params = new RelativeLayout.LayoutParams(40, 40);
 params.leftMargin = x;
 params.topMargin = y;
 rv.addView(im1, params);

<RelativeLayout android:id="@+id/my_ph"
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="bottom">
        <ImageView android:id="@+id/image" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:layout_alignParentTop="true"
            android:background="@drawable/map" />
        <TextView android:id="@+id/textView1" android:layout_width="wrap_content"  android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:layout_below="@+id/image" android:layout_alignParentLeft="true"></TextView>

  </RelativeLayout>

ImageView img=(ImageView)findViewById(R.id.image);
img.setBackgroundDrawable(getResource().getDrawable(R.drawable.lamp_on));