GridView 和ListView中自适应高度

android中GridView 和ListView放在scrollView中时会默认的只有一行高这时就要我们自己计算出它的高度啦

首先是listview的

//动态设置listview的高度
public void setListViewHeightBasedOnChildren(ListView listView) {
// 获取ListView对应的Adapter
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));
((MarginLayoutParams)params).setMargins(10, 10, 10, 10);
listView.setLayoutParams(params);
}

下面是Gridview的 注意里面要设置你的列数

public  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 = 4;// listView.getNumColumns();
int totalHeight = 0;
// 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()+40;  //添加40顶边距等
}

// 获取listview的布局参数
ViewGroup.LayoutParams params = listView.getLayoutParams();
// 设置高度
params.height = totalHeight;
// 设置margin
((MarginLayoutParams) params).setMargins(10, 10, 10, 10);
// 设置参数
listView.setLayoutParams(params);
}