android textview scroll

xml:

<TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:scrollbarStyle="insideOverlay"
        android:scrollbars="vertical"
        android:text="TextView"
        android:textAlignment="center"
        android:textSize="25sp"
        android:fadeScrollbars="false" />



code:

private TextView tv1= null;
tv1.setMovementMethod(new ScrollingMovementMethod());