<TextView
        android:id="@+id/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ellipsize="marquee"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:marqueeRepeatLimit="marquee_forever"
        android:singleLine="true"
        android:text=""
        android:textColor="@android:color/black" />

还需要在java类中添加一行
TextView textview = (TextView) findViewById(R.id.textview);
textview.setMovementMethod(ScrollingMovementMethod.getInstance());