真正的TextView跑馬燈

android自帶的跑馬燈是必須在有焦點的情況下才會滾動，一旦失去焦點跑馬燈就會失去效果。

現在我的做法是自定義TextView 并重寫isFocused和onFocusChanged方法，設置focused為true，這樣TextView就可以始終獲取到焦點

親測可用！

1。自定義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;//重點  
        }  

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

2。xml中引用：

    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;//重點  
        }  

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