listview選中一行，ScrollView嵌套ListView只顯示一行

在開發的過程當中，由于手機屏幕的大小的限制，我們經常需要使用滑動的方式，來顯示更多的內容。在最近的工作中，遇見一個需求，需要將ListView嵌套到ScrollView中顯示。于是乎有了如下布局：?

?

<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>???

?

運行程序，如下結果，無論你如何調整layout_width，layout_height屬性，ListView列表只顯示一列！?

在查閱的各種文檔和資料后，發現在ScrollView中嵌套ListView空間，無法正確的計算ListView的大小，故可以通過代碼，根據當前的ListView的列表項計算列表的尺寸。實現代碼如下：?

?

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)?{???
????????//?獲取ListView對應的Adapter???
????????ListAdapter?listAdapter?=?listView.getAdapter();???
????????if?(listAdapter?==?null)?{???
????????????return;???
????????}???
???
????????int?totalHeight?=?0;???
????????for?(int?i?=?0,?len?=?listAdapter.getCount();?i?<?len;?i++)?{???
????????????//?listAdapter.getCount()返回數據項的數目???
????????????View?listItem?=?listAdapter.getView(i,?null,?listView);???
????????????//?計算子項View?的寬高???
????????????listItem.measure(0,?0);????
????????????//?統計所有子項的總高度???
????????????totalHeight?+=?listItem.getMeasuredHeight();????
????????}???
???
????????ViewGroup.LayoutParams?params?=?listView.getLayoutParams();???
????????params.height?=?totalHeight+?(listView.getDividerHeight()?*?(listAdapter.getCount()?-?1));???
????????//?listView.getDividerHeight()獲取子項間分隔符占用的高度???
????????//?params.height最后得到整個ListView完整顯示需要的高度???
????????listView.setLayoutParams(params);???
????}???
}???

運行結果，OK問題搞定，打完收工！?

listview選中一行。?

來源：?http://www.cnblogs.com/zhwl/p/3333585.html

來自為知筆記(Wiz)