如果你既想使用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就好了,但是使用這兩個控件比較麻煩的是需要動態計算出列數。
所以想要解決這個問題,需要用如下方法:
首先定義一個類‘MyGridView’繼承自GridView,設置每行用到的背景。
public class MyGridView extends GridView {
private Bitmap background;
public MyGridView(Context context, AttributeSet attrs) {
super(context, attrs);
background = BitmapFactory.decodeResource(getResources(), R.drawable.bg);
}
}
其次複寫GridView的dispatchDraw(Canvas canvas)方法自定義背景
@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,現在可以用在Xml裏了,看看效果吧
<your.package.name.MyGridView android:id="@+id/mygridview" <!-- GridView 其他屬性 --> />原文地址:http://thierry-xing.iteye.com/blog/1396779