java - creating buttons in main activity while drawing in custom surfaceView -

in mainactivity want handle buttons , in gamesurfaceview want handle drawing stuff, can't see buttons on gamesurfaceview why that? gameloop class handles ondraw calls. when set contentview mainactivity, don't see drawings , when set contentview gamesurfaceview, see drawings can't see buttons.

how implement gamesufaceview mainactivity? please me. here short form of code:

this mainactivity [edit: shortened extract]

public class mainactivity extends appcompatactivity {  private button button1;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      button1 = (button) findviewbyid(r.id.btn1);     button1.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {         }     });      setcontentview(new gamesurfaceview(this));     } } 

this custom surfaceview

public class gamesurfaceview extends surfaceview implements surfaceholder.callback{  private context context;  public gamesurfaceview(context context){     super(context);     getholder().addcallback(this);     this.context = context;     setfocusable(true); }  @override public void ondraw(canvas canvas){     canvas.drawrect(60, 60, 100, 100, p); } 

and here xml file mainactivity

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".mainactivity" android:screenorientation="landscape" android:orientation="horizontal" >  <button     android:id="@+id/btn1"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/btn1"     android:layout_gravity="center_vertical" /> </linearlayout> 

[edit] after day of searching found problem similiar mine: [how use surfaceview main.xml on android?

but can still not see buttons defined on mainactivity, see black screen , rectangle drawing:

i added mainactivity gamesurfaceview = (gamesurfaceview) findviewbyid(r.id.gamesurfaceview); , deleted setcontentview(new gamesurfaceview(this)); added xml file code:

<com.example.joschi.tryout.gamesurfaceview     android:layout_width="match_parent"     android:layout_height="match_parent"     android:id="@+id/gamesurfaceview"     /> 

i still not able see button defined, why this? can me?

i solved problem.

i need define button bevore gamesurfaceview, in xml file, otherwise gamesurfaceview "over" button , that's reason can't see it.