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// OFActivity.java

    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        String packageName = getPackageName();
        setContentView(R.layout.main_layout);

        mSwitchButton = (Button)findViewById(R.id.switch_to_main);

        mSwitchButton.setOnClickListener(new View.OnClickListener()
        {
        	@Override
        	public void onClick(View v)
        	{
        		Log.v(LogTag, "init view");
        	}
        });

        ofApp = new OFAndroid(packageName,this);
    }

// main_layout.xml
<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout android:id="@+id/relativeLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">
    <cc.openframeworks.OFGLSurfaceView android:id="@+id/of_gl_surface"
 		android:layout_width="fill_parent"
 		android:layout_height="fill_parent"/>
    	<!-- add here other views' layouts -->

    	<Button
    	    android:id="@+id/switch_to_main"
    	    android:text="@string/switch_to_main"
    	    android:layout_width="wrap_content"
    	    android:layout_height="wrap_content"
    	    android:layout_gravity="bottom|center"
    	    />

    </RelativeLayout>