若是你既想使用GridView,又想給每行設置單獨的背景,該怎麼辦呢?也許你說,用Listview或TableLayout就行了,可是使用這兩個控件比較麻煩的是須要動態計算出列數。 java
因此想要解決這個問題,須要用以下方法: android
首先定義一個類‘MyGridView’繼承自GridView,設置每行用到的背景。 canvas
public class MyGridView extends GridView { private Bitmap background; public MyGridView(Context context, AttributeSet attrs) { super(context, attrs); background = BitmapFactory.decodeResource(getResources(), R.drawable.bg); } }
其次複寫GridView的dispatchDraw(Canvas canvas)方法自定義背景 ide
@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,如今能夠用在Xml裏了,看看效果吧 spa
<your.package.name.MyGridView android:id="@+id/mygridview" <!-- GridView 其餘屬性 --> />原文地址: http://thierry-xing.iteye.com/blog/1396779