ScrollView中的ListView只显示一条数据的解决方法

在ScrollView中嵌套ListView，会出现ListView只显示一条数据的现象，解决方法有两种，如下：

1. 在Activity中list view.setAdapter以后执行如下方法

public class MainActivity extends Activity {
private ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView1);
String[] adapterData = new String[] { "Afghanistan", "Albania",… … "Bosnia"};
listView.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,adapterData));
setListViewHeightBasedOnChildren(listView);
}
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, 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);
}
}

2. 重写ListView控件，重写onMeasure方法

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
// Create an adapter to point at this cursor
SampleCursorAdapter adapter = new SampleCursorAdapter(getActivity(), (SampleCursor)cursor);
lv.setAdapter(adapter);
Utils.setListViewHeightBasedOnChildren(lv);
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