android自带的跑马灯是必须在有焦点的情况下才会滚动，一旦失去焦点跑马灯就会失去效果。

现在我的做法是自定义TextView 并重写isFocused和onFocusChanged方法，设置focused为true，这样TextView就可以始终获取到焦点

亲测可用！

1。自定义TextView：

import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.ViewDebug.ExportedProperty;
import android.widget.TextView;

public class ScrollForeverTextView extends TextView
{

    public ScrollForeverTextView(Context context)
    {
        super(context);
        // TODO Auto-generated constructor stub
    }

    public ScrollForeverTextView(Context context, AttributeSet attrs,
            int defStyle)
    {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
    }

    public ScrollForeverTextView(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        // TODO Auto-generated constructor stub
    }

    @Override
    @ExportedProperty(category = "focus")
    public boolean isFocused()
    {
        // TODO Auto-generated method stub
        return true;//重点
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction,
            Rect previouslyFocusedRect)
    {
        // TODO Auto-generated method stub
        super.onFocusChanged(true, direction, previouslyFocusedRect);//重点
    }
}

2。xml中引用：

           <。。。.view.ScrollForeverTextView
                android:id="@+id/title"
                style="@style/shadow5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:ellipsize="marquee"
                android:focusable="true"
                android:focusableInTouchMode="true"
                android:marqueeRepeatLimit="marquee_forever"
                android:maxEms="8"
                android:scrollHorizontally="true"
                android:singleLine="true"
                android:text=""
                android:textColor="@color/white"
                android:textSize="@dimen/text_size_18" />