Android : Text View Widget

in main.xml

<TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello"
        android:visibility="invisible"
      />

edit the android:text
open res/values/strings.xml
add this : 

 <string name="hello">some text here</string>

android:visibility 

Constant Value Description visible 0 Visible on screen; the default value. invisible 1 Not displayed, but taken into account during layout (space is left for it). gone 2 Completely hidden, as if the view had not been added.