计算Item的高度，重设ListView的高度，使ListView一次性列出所有数据，嵌套顺序ScrollView，LinearLayout，ListView

code

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

/**      * 设置ListView的高度      */     public static void setListViewHeightBasedOnChildren(ListView lv) {         ListAdapter listAdapter = lv.getAdapter();         if (listAdapter == null) {             // pre-condition             return;         }           int totalHeight = 0;         for (int i = 0; i < listAdapter.getCount(); i++) {             View listItem = listAdapter.getView(i, null, lv);             listItem.measure(0, 0);             totalHeight += listItem.getMeasuredHeight();         }         ViewGroup.LayoutParams params = lv.getLayoutParams();         params.height = totalHeight + (lv.getDividerHeight() * (listAdapter.getCount() - 1));         lv.setLayoutParams(params);     }

 ListView使用的时候一定要嵌套在 LinearLayout 中，因为其他的Layout(如RelativeLayout)没有重写onMeasure()，所以会在onMeasure()时抛出异常，导致重设高度失效。

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     tools:context="com.jay.myappstudy.SvLvActivity">     <ScrollView         android:id="@+id/sv1"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:fillViewport="true">         <LinearLayout             android:layout_width="match_parent"             android:layout_height="match_parent">             <ListView                 android:id="@+id/lv1"                 android:layout_width="match_parent"                 android:layout_height="match_parent" />         </LinearLayout>     </ScrollView> </LinearLayout>

　　page code

?

1 2 3 4 5 6 7 8 9 10 11

mlv1 = findViewById(R.id.lv1);         ListViewAdapter adapter = new ListViewAdapter(this, mlv1,R.layout.fruit_item, data2);           mlv1.setOnItemClickListener(new AdapterView.OnItemClickListener() {             @Override             public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {               }         });         mlv1.setAdapter(adapter);         Utility.setListViewHeightBasedOnChildren(mlv1);