Android重绘ListView高度

经常会有这样需求，需要ListView默认将所有的条目显示出来，这就需要外层使用ScrollView，ScrollView里面放置一个重绘高度的ListView，类似下面这样

工具类

package ……;import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;/*** Created by kongqw on 2015/11/25.*/
public final class ListViewUtil {private ListViewUtil() {}public static void setListViewHeightBasedOnChildren(ListView listView) {try {// 获取ListView对应的AdapterListAdapter listAdapter = listView.getAdapter();if (listAdapter == null) {return;}int totalHeight = 0;for (int i = 0, len = listAdapter.getCount(); i < len; i++) {// listAdapter.getCount()返回数据项的数目View listItem = listAdapter.getView(i, null, listView);// 计算子项View 的宽高listItem.measure(0, 0);// 统计所有子项的总高度totalHeight += listItem.getMeasuredHeight();}ViewGroup.LayoutParams params = listView.getLayoutParams();params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));// listView.getDividerHeight()获取子项间分隔符占用的高度// params.height最后得到整个ListView完整显示需要的高度listView.setLayoutParams(params);} catch (Exception e) {e.printStackTrace();}}
}

使用

在ListView调用完setAdapter()后，调用工具类的方法，重绘ListView的高度，类似这样

……mLvOutputs = (ListView) findViewById(R.id.lv_outputs);……TransactionOutputsAdapter transactionOutputsAdapter = new TransactionOutputsAdapter(this, transactionInfo.getData().getOut());
mLvOutputs.setAdapter(transactionOutputsAdapter);
// 重新计算Listview高度
ListViewUtil.setListViewHeightBasedOnChildren(mLvOutputs);