class="Paragraph SCX91079908" style="margin: 0px; padding: 0px;">在开发的过程当中,由于手机屏幕的大小的限制,我们经常需要使用滑动的方式,来显示更多的内容。在最近的工作中,遇见一个需求,需要将ListView嵌套到ScrollView中显示。于是乎有了如下布局:
[html] view plaincopy
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://schemas.android.com/tools"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:background="#FFE1FF"
- android:orientation="vertical" >
- <ScrollView
- android:layout_width="match_parent"
- android:layout_height="match_parent" >
- <LinearLayout
- android:layout_width="match_parent"
- android:layout_height="match_parent" >
- <ListView
- android:id="@+id/listView1"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:fadingEdge="vertical"
- android:fadingEdgeLength="5dp" />
- </LinearLayout>
- </ScrollView>
- </LinearLayout>
运行程序,如下结果,无论你如何调整layout_width,layout_height属性,ListView列表只显示一列!
在查阅的各种文档和资料后,发现在ScrollView中嵌套ListView空间,无法正确的计算ListView的大小,故可以通过代码,根据当前的ListView的列表项计算列表的尺寸。实现代码如下:
[java] view plaincopy
- 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) {
-
- ListAdapter listAdapter = listView.getAdapter();
- if (listAdapter == null) {
- return;
- }
-
- int totalHeight = 0;
- for (int i = 0, len = listAdapter.getCount(); i < len; 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);
- }
- }
运行结果,OK问题搞定,打完收工!