Android – GridView为每行设定背景【转】

Blogfor明月依希 2012-10-13

如果你既想使用GridView,又想给每行设置单独的背景,该怎么办呢?也许你说,用Listview或TableLayout就好了,但是使用这两个控件比较麻烦的是需要动态计算出列数。

所以想要解决这个问题,需要用如下方法:

首先定义一个类‘MyGridView’继承自GridView,设置每行用到的背景。

public class MyGridView extends GridView {  
   
    private Bitmap background;  
   
    public MyGridView(Context context, AttributeSet attrs) {  
        super(context, attrs);  
        background = BitmapFactory.decodeResource(getResources(), R.drawable.bg);  
    }  
   
}

 其次复写GridView的dispatchDraw(Canvas canvas)方法自定义背景

@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);  
}

 好了,现在可以用在Xml里了,看看效果吧

<your.package.name.MyGridView  
    android:id="@+id/mygridview"  
    <!-- GridView 其他属性 -->  
    />
 原文地址:http://thierry-xing.iteye.com/blog/1396779

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