Lock symbol in Android xml : I've been trying to put a [Lock Symbol][1] in the textview of an activity.
However what I have used from this website did not seem to work.

    <TextView
        android:id="@+id/lockTextView"
        android:layout_width="wrap_content"
        android:layout_height="match_parent" 
        android:text="\uD83D\uDD12"/>


  [1]: http://www.fileformat.info/info/unicode/char/1f512/index.htm