/**  * 對高度和寬度進行統計 然后設置gridView的寬高。  * @param numColumns 設定行數  * @param gridView   */public static void calGridViewSumWH(int numColumns ,GridView gridView) {  // 獲取GridView對應的Adapter  ListAdapter listAdapter = gridView.getAdapter();  if (listAdapter == null) {   return;  }  int totalHeight = 0;  int totalWidth = 0;  for (int i = 0, len = listAdapter.getCount(); i < len; i++) { // listAdapter.getCount()返回數據項的數目   View listItem = listAdapter.getView(i, null, gridView);   listItem.measure(0, 0); // 計算子項View 的寬高   totalWidth = listItem.getMeasuredWidth();   if ((i+1)%numColumns == 0) {    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {     totalHeight += listItem.getMeasuredHeight() + gridView.getVerticalSpacing(); // 統計所有子項的總高度    } else {     totalHeight += listItem.getMeasuredHeight();    }   }   if ((i+1) == len && (i+1)%numColumns != 0) {    totalHeight += listItem.getMeasuredHeight(); // 統計所有子項的總高度   }  }  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {   totalHeight += 20;  }  if (listAdapter.getCount() < numColumns) {   gridView.setNumColumns(listAdapter.getCount());  }  ViewGroup.LayoutParams params = gridView.getLayoutParams();  params.height = totalHeight;  params.width = totalWidth * listAdapter.getCount();  gridView.setLayoutParams(params); }