Adding a Textview to a relative layout in Android -

so have researched everywhere no else seems have problem because know how program, anyways i'm trying add textview relative layout in android app, no matter cannot text , buttons have in layout. here code activity:

public class enterapp extends activity { int marblesinjar=0; int targetmarblesinjar=0; @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     intent intent= getintent();     targetmarblesinjar= intent.getintextra("message_marbles",0);      relativelayout marble= new relativelayout(this);      textview textview = new textview(getapplicationcontext());      textview.settextsize(20);     textview.settext("your marble jar full when has "+ targetmarblesinjar + " marbles. have " + marblesinjar + " marbles.");     textview.settextcolor(color.black);     marble.addview(textview);      this.setcontentview(r.layout.activity_enter_app);       // show button in action bar.     setupactionbar(); } 

here code xml relative layout

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/relativelayout" android:layout_width="match_parent" android:layout_height="wrap_content" 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=".enterapp" >   <button  android:id="@+id/button1"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_alignbaseline="@+id/button2"  android:layout_alignbottom="@+id/button2"  android:layout_marginright="16dp"  android:layout_toleftof="@+id/button2"  android:onclick="addmarble"  android:text="@string/addmarble" />   <button  android:id="@+id/button2"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_alignparentbottom="true"  android:layout_alignparentright="true"  android:layout_marginbottom="82dp"  android:layout_marginright="22dp"  android:onclick="lossmarble"  android:text="@string/losemarble" />    </relativelayout> 

you have relativelayout don't need

 relativelayout marble= new relativelayout(this); 

this creates new relativelayout. create textview , add layout after inflate setcontentview()

public class enterapp extends activity {     int marblesinjar=0;     int targetmarblesinjar=0;     relativelayout marble; 

@override

public void oncreate(bundle savedinstancestate) {   super.oncreate(savedinstancestate);   ...       setcontentview(r.layout.activity_enter_app);        textview textview = new textview(this);      textview.settextsize(20);     textview.settext("your marble jar full when has "+ targetmarblesinjar +     " marbles. have " + marblesinjar + " marbles.");     textview.settextcolor(color.black);     marble = (relativelayout) findviewbyid(r.id.relativelayout); // id gave root layout     marble.addview(textview);