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ListView自适应：

public static void setListViewHeightBasedOnChildren(ListView listView) {        ListAdapter listAdapter = listView.getAdapter();        if (listAdapter == null) {            return;        }        int totalHeight = 0;        for (int i = 0; i < listAdapter.getCount(); i++) {            View listItem = listAdapter.getView(i, null, listView);            listItem.measure(0, 0);            totalHeight += listItem.getMeasuredHeight();        }        ViewGroup.LayoutParams params = listView.getLayoutParams();        params.height = totalHeight                + (listView.getDividerHeight() * (listAdapter.getCount() - 1));        listView.setLayoutParams(params);    }

GridView自适应，存在Bug待解决 // listView.getNumColumns() = -1?; 始终返回 -1；  public static void setListViewHeightBasedOnChildren(GridView listView) {        // 获取listview的adapter        ListAdapter listAdapter = listView.getAdapter();        if (listAdapter == null) {            return;        }        // 固定列宽，有多少列        int col = 3;        // listView.getNumColumns() = -1?;        // i每次加4，相当于listAdapter.getCount()小于等于4时 循环一次，计算一次item的高度，        // listAdapter.getCount()小于等于8时计算两次高度相加        /*for (int i = 0; i < listAdapter.getCount(); i += col) {            // 获取listview的每一个item            View listItem = listAdapter.getView(i, null, listView);            listItem.measure(0, 0);            // 获取item的高度和            totalHeight += listItem.getMeasuredHeight();        }*/        View listItem = listAdapter.getView(0, null, listView);        listItem.measure(0, 0);        // 获取item的高度和        int totalHeight = listItem.getMeasuredHeight();        // 获取listview的布局参数        ViewGroup.LayoutParams params = listView.getLayoutParams();        if (listAdapter.getCount() % col != 0) {            totalHeight = totalHeight * (listAdapter.getCount() / col + 1);        } else {            totalHeight = totalHeight * (listAdapter.getCount() / col);        }        // 设置高度        params.height = totalHeight;        // 设置margin        ((MarginLayoutParams) params).setMargins(10, 10, 10, 10);        // 设置参数        listView.setLayoutParams(params);    }  
   
  * Set the number of columns in the grid 
  
   
       * 
  
   
       * @param numColumns The desired number of columns. 
  
   
       * 
  
   
       * @attr ref android.R.styleable#GridView_numColumns 
  
   
       */ 
  
   
      publicvoid setNumColumns(intnumColumns) {
     
  
   
          if(numColumns != mRequestedNumColumns) {
     
  
   
              mRequestedNumColumns = numColumns; 
  
   
              requestLayoutIfNecessary(); 
  
   
          } 
  
   
      } 
 debug中在这里发现mRequestedNumColumns 能正确获得colums num值，所以想通过反射获取该值插入； Field field = GridView.class.getDeclaredField("mRequestedNumColumns"); // 获得申明的字段field.setAccessible(true); // 设置访问权限column = Integer.valueOf(field.get(gridView).toString()); // 获取字段的值 剩下的就简单了！！！

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