<TextView
    android:text="My web site: www.stackoverflow.com"
    android:id="@+id/TextView1"
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    android:autoLink="web">
</TextView>

final TextView myClickableUrl = (TextView) findViewById(R.id.myClickableUrlTextView);
myClickableUrl.setText("Click my web site: www.stackoverflow.com");
Linkify.addLinks(myClickableUrl, Linkify.WEB_URLS);