public class AlwaysMarqueeTextView extends TextView {
public AlwaysMarqueeTextView(Context context) {super(context);}
public AlwaysMarqueeTextView(Context context, AttributeSet attrs) {super(context, attrs);}
public AlwaysMarqueeTextView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}
@Overridepublic boolean isFocused() {return true;}
在布局XML文件中加入这么一个AlwaysMarqueeTextView，这个加入方法也是刚刚学的。
XML语言: layout.xml <com.examples.AlwaysMarqueeTextView android:id= “@+id/AMTV1″ android:layout_width= “fill_parent” android:layout_height= “wrap_content” android:lines= “1″ android:focusable= “true” android:focusableInTouchMode= “true” android:scrollHorizontally= “true” android:marqueeRepeatLimit= “marquee_forever” android:ellipsize= “marquee” android:background= “@android:color/transparent” />ellipsize属性设置当文字过长时,该控件该如何显示。有如下值设置：”start”—–省略号显示在开头；”end”——省略号显示在结尾；”middle”—-省略号显示在中间；”marquee” ——以跑马灯的方式显示(动画横向移动)
marqueeRepeatLimit属性在ellipsize指定marquee的情况下，设置重复滚动的次数，当设置为marquee_forever时表示无限次。
focusable属性自己猜测的，应该是能否获得焦点，同样focusableInTouchMode应该是滑动时能否获得焦点。
组合View的问题：
XML语言: 组合View < LinearLayout xmlns:android = “http://schemas.android.com/apk/res/android” android:orientation = “vertical” android:gravity = “center_vertical” android:background = “@drawable/f_background” android:layout_width = “fill_parent” android:focusable = “true” android:layout_height = “50px” > < TextView android:id = “@+id/info_text” android:focusable = “true” android:layout_width = “fill_parent” android:layout_height = “wrap_content” android:text = “test marquee .. “ android:textColor = “@color/black” android:singleLine = “true” android:ellipsize = “marquee” android:marqueeRepeatLimit = “3″ android:textSize = “18sp” /> < TextView android:id = “@+id/date_text” android:layout_width = “fill_parent” android:layout_height = “wrap_content” android:layout_gravity = “bottom” android:textColor = “@color/gray” android:text = “2010/05/28″ android:textSize = “12sp” /> </ LinearLayout >上面示例中2个TextView组合为一个View,由于设置了LinearLayout为focusable而TextView就没法取得焦点了,这样 这个TextView的跑马灯效果就显示不出来,就算你也设置TextView的 android:focusable="true" 也是 没用的. 这个时候就要使用addStatesFromChildren 这个属性了,在LinearLayout中设置这个属性,然后设置TextView的focusable= "true" 就可以了.关于 addStatesFromChildren的说明:
Sets whether this ViewGroup's drawable states also include its children's drawable states.
From: http://hmifly.blog.163.com/blog/static/1285835072011322352406/
