android 走马灯效果

<TextView

        android:id="@+id/myTextView"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:ellipsize="marquee"

        android:marqueeRepeatLimit="marquee_forever"

        android:scrollHorizontally="true"

        android:singleLine="true"

        android:focusable="true"  

        android:focusableInTouchMode="true"  

        android:text="hello world my dear friend this is a long long string~~~~hello world my dear friend this is a long long string" />