make a TextView scrollable + Bug in Android -

i have read post: making textview scrollable on android without success.

my app looks this:

where black space textview. declared @ xml this:

<textview android:id="@+id/consola" android:layout_width="320px" android:layout_height="333px" android:layout_alignparenttop="true" android:layout_alignparentleft="true" android:scrollbars = "vertical" android:gravity="top|left"  android:inputtype="textmultiline" > </textview> 

and code takes text edittext when button pressed, , writes new line @ textview text. code looks like:

public class helloworldactivity extends activity { /** called when activity first created. */ @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main);      final textview miconsola = (textview) findviewbyid(r.id.consola);     miconsola.setmovementmethod(new scrollingmovementmethod());      final edittext lineacomando = (edittext) findviewbyid(r.id.linea_comando);     final button botonconectar = (button) findviewbyid(r.id.boton_conectar);     final button botonenviar = (button) findviewbyid(r.id.boton_enviar);      botonenviar.setenabled(false);      botonconectar.setonclicklistener(new onclicklistener() {         public void onclick(view v) {           // intentaremos conectar por bluetooth aqui             botonconectar.setenabled(false);             botonenviar.setenabled(true);         }                      });      botonenviar.setonclicklistener(new onclicklistener() {         public void onclick(view v) {           // enviamos el comando             charsequence comando = lineacomando.gettext();             miconsola.append(comando+"\r\n");         }                      });     miconsola.append("esto es una prueba\r\n");     miconsola.append("esto es otra prueba\r\n");   } 

}

but when text reaches bottom of textview, still writes new line on edittext, , if go on, no scroll bar appear.

any idea of i'm doing wrong?

put text view in vertical scrollview.set height of scroll view fixed height did text view.then set wrap_content text view's width , height.