有关Android ListView根据项数的大小自动改变高度问题

第一种:按照listview的项数确定高度

 1     ListAdapter listAdapter = listView.getAdapter();  
 2     if (listAdapter == null) { 
 3         return; 
 4     } 
 5 
 6     int totalHeight = 0; 
 7     for (int i = 0; i < listAdapter.getCount(); i++) { 
 8         View listItem = listAdapter.getView(i, null, listView); 
 9         listItem.measure(0, 0); 
10         totalHeight += listItem.getMeasuredHeight(); 
11     } 
12 
13     ViewGroup.LayoutParams params = listView.getLayoutParams(); 
14     params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() – 1)); 
15     ((MarginLayoutParams)params).setMargins(10, 10, 10, 10);
16     listView.setLayoutParams(params);

还有子ListView的每个Item必须是LinearLayout，不能是其他的，因为其他的Layout(如RelativeLayout)没有重写onMeasure()，所以会在onMeasure()时抛出异常。

第二种:直接使用当前界面尺寸,稍加调整

1 ViewGroup.LayoutParams params = listView.getLayoutParams();
2 params.height = getWindowManager().getDefaultDisplay().getHeight() – 30;
3 // Toast.makeText(this, params.height+"", 3000).show();
4 listView.setLayoutParams(params);

XML布局写法,请注意这里需要一个内部LinerLayout

 1 <ScrollView
 2         android:layout_width="fill_parent"
 3         android:layout_height="fill_parent"
 4         android:fadingEdge = "none"
 5         android:background="#FFF4F4F4"
 6         xmlns:android="http://schemas.android.com/apk/res/android"
 7         >
 8    <LinearLayout
 9     android:gravity="center_horizontal"
10     android:orientation="vertical"
11     android:background="#fff4f4f4"
12     android:layout_width="fill_parent"
13     android:layout_height="fill_parent"
14     >
15     <ListView
16         android:id="@+id/moreItemsListView"
17         android:layout_width="fill_parent"
18         android:layout_height="fill_parent"
19         android:cacheColorHint="#FFF4F4F4"
20         android:dividerHeight="0.0dip"
21         android:fadingEdge="none"
22         />
23    </LinearLayout>
24 </ScrollView>