如何滚动列表视图背景与项目

Question

我将图像设置为Listview背景,如果我想用项目滚动它,我该怎么办？

例如:1是背景,如果我向下滚动Listview,它将改变

        1          
-----1-----1--------
   1         1
-1-------------1----

至

--------1----------
      1    1
---1----------1----
 1              1

也许我可以扩展listview并覆盖dispatchDraw,但如果我使用listFragment,我该怎么办？有人帮帮我吗？

Answer 1

在Activity的XML文件中定义listview,如:

(根据您的要求在此xml文件中定义属性)

<com.example.MyCustomListView
    android:id="@+id/listview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"/>

创建一个名为MyCustomListView的类::

    public class MyCustomListView extends ListView
    {

       private Bitmap background;

    public MyCustomListView(Context context, AttributeSet attrs) 
    {
        super(context, attrs);
        background = BitmapFactory.decodeResource(getResources(), R.drawable.yourImageName);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) 
    {
        int count = getChildCount();
        int top = count > 0 ? getChildAt(0).getTop() : 0;
        int backgroundWidth = background.getWidth();
        int backgroundHeight = background.getHeight();
        int width = getWidth();
        int height = getHeight();

        for (int y = top; y < height; y += backgroundHeight)
        {
            for (int x = 0; x < width; x += backgroundWidth)
            {
                canvas.drawBitmap(background, x, y, null);
            }
        }
        super.dispatchDraw(canvas);
    }
 }

希望这会解决你的问题:)