Android – GridView为每行设定背景【转】
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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