获取GridView 中的行数

Question

前提是，如何获取GridView 中总共有多少行呢？

Answer 1

后来看书，自己也到了这个count属性，嘿嘿……

Answer 2

@Override
protected void onAttachedToWindow() {
  super.onAttachedToWindow();
  measureHeight();
}private void measureHeight(){
int childHeight = 0;
mItemCount = getAdapter() == null ? 0 : getAdapter().getCount();
final int count = mItemCount;
if (count > 0) {
final View child = getAdapter().getView(0, null, null);
AbsListView.LayoutParams p = (AbsListView.LayoutParams)child.getLayoutParams();
if (p == null) {
p = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 0);
child.setLayoutParams(p);
}

int childHeightSpec = getChildMeasureSpec(
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 0, p.height);
int childWidthSpec = getChildMeasureSpec(
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 0, p.width);
child.measure(childWidthSpec, childHeightSpec);
childHeight = child.getMeasuredHeight();
}
int ourSize = 0;
for (int i = 0; i < count; i += mNumColumns) {
            ourSize += childHeight;
        }
        int heightSize = ourSize;
        android.view.ViewGroup.LayoutParams params = getLayoutParams();
        params.height = heightSize;
        setLayoutParams(params);
}