TextView不用获取焦点也能实现跑马灯

public class AlwaysMarqueeScrollView extends TextView {

// com.duopin.app.AlwaysMaguequeScrollView
public AlwaysMarqueeScrollView(Context context) {

super(context);

// TODO Auto-generated constructor stub
}

public AlwaysMarqueeScrollView(Context context, AttributeSet attrs) {

super(context, attrs);

// TODO Auto-generated constructor stub
}

public AlwaysMarqueeScrollView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

// TODO Auto-generated constructor stub
}

@Override
public boolean isFocused() {

return true;

}

@Override
protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {

// TODO Auto-generated method stub
// fobid call parent constructor
// super.onFocusChanged(focused, direction, previouslyFocusedRect);
}

}

关于MarqueeText类中为什么要复写onFocusChanged()方法，那是因为如果不写，在Textview 获得焦点后，再失去焦点时 字就会停止“跑”了，所以如果想让它一直跑下去就复写onFocusChanged(),并且里面什么也不做（主要是不能调用父类的方法）

XML引用：

          android:id="@+id/lunar_txtv"
        android:gravity="center"
        android:layout_
        android:layout_
        android:text="@string/hello"
         android:ellipsize="marquee"
  android:scrollHorizOntally="true"
  android:marqueeRepeatLimit="marquee_forever"
  android:singleLine="true"
                android:focusable="true"
        />