android - How to add a TextView between Buttons -

i'm trying on button click dynamically add textview comments associated button. have button , b. want(when click on a) add text/textview in between button , b.

here xml file:

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/layout"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     >       <button         android:id="@+id/a"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_margintop="5dp"         android:text="a"         />      <button         android:id="@+id/b"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_below="@id/a"         android:layout_margintop="5dp"         android:text="b"         />       <textview         android:id="@+id/txt"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="this test...."         android:visibility="invisible"         />  </relativelayout> 

here code tried:

public class mainactivity extends appcompatactivity {       @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          final button a, b , c;         final textview txt;         final relativelayout layout;          layout = (relativelayout) findviewbyid(r.id.layout);         = (button) findviewbyid(r.id.a);         b = (button) findviewbyid(r.id.b);         txt = (textview) findviewbyid(r.id.txt);           a.setonclicklistener(new view.onclicklistener() {             public void onclick(view v) {                 relativelayout.layoutparams p = new relativelayout.layoutparams(relativelayout.layoutparams.wrap_content, relativelayout.layoutparams.wrap_content);                 p.addrule(relativelayout.below, a.getid());                 layout.addview(txt, p);                 setcontentview(layout);             }         });      }  } 

i have following error message: specified child has parent. must call removeview() on child's parent first.

you can try.

textview textview; a.setonclicklistener(new view.onclicklistener() {             public void onclick(view v) {                 relativelayout.layoutparams p = new relativelayout.layoutparams(relativelayout.layoutparams.wrap_content, relativelayout.layoutparams.wrap_content);                 p.addrule(relativelayout.below, a.getid());     textview = new textview(mainactivity.this);     layout.addview(textview, p);              }         }); 

than can set text on it.