Question

我想在listview中添加一个标题，但它正在获得强制关闭。我正试图在我的列表视图的顶部放置一个标题。因此，当我创建这个列表视图时，我正在使用这些代码：

lv = getListView();

        LayoutInflater inflater = getLayoutInflater();
        ViewGroup header = (ViewGroup)inflater.inflate(R.layout.header, lv, false);
        lv.addHeaderView(header, null, false);

这是我的header.xml：

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#DCDCDC"
    android:orientation="vertical" >

    <requestFocus />

    <ImageView
        android:id="@+id/imageButton2"
        android:layout_width="fill_parent"
        android:layout_height="52dip"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:contentDescription="@string/header"
        android:src="@drawable/list_header" />

     <ImageButton
        android:id="@+id/imageButtonSearch"
        android:layout_width="60dip"
        android:layout_height="45dip"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:contentDescription="@string/header"
        android:src="@drawable/search" 
        android:background="@android:color/transparent" 
        />

    <ImageView
        android:id="@+id/imageButton3"
        android:layout_width="150dip"
        android:layout_height="50dip"
        android:layout_alignBottom="@+id/imageButton2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:contentDescription="@string/header"
        android:src="@drawable/titel" />

    </RelativeLayout>

这是我的logcat：

12-04 19:31:30.478: E/AndroidRuntime(372): FATAL EXCEPTION: main
12-04 19:31:30.478: E/AndroidRuntime(372): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.laurenswuyts.find.it/com.laurenswuyts.find.it.AndroidListViewActivity}: java.lang.IllegalStateException: Cannot add header view to list -- setAdapter has already been called.
12-04 19:31:30.478: E/AndroidRuntime(372):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
12-04 19:31:30.478: E/AndroidRuntime(372):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
12-04 19:31:30.478: E/AndroidRuntime(372):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-04 19:31:30.478: E/AndroidRuntime(372):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
12-04 19:31:30.478: E/AndroidRuntime(372):  at android.os.Handler.dispatchMessage(Handler.java:99)
12-04 19:31:30.478: E/AndroidRuntime(372):  at android.os.Looper.loop(Looper.java:130)
12-04 19:31:30.478: E/AndroidRuntime(372):  at android.app.ActivityThread.main(ActivityThread.java:3683)
12-04 19:31:30.478: E/AndroidRuntime(372):  at java.lang.reflect.Method.invokeNative(Native Method)
12-04 19:31:30.478: E/AndroidRuntime(372):  at java.lang.reflect.Method.invoke(Method.java:507)
12-04 19:31:30.478: E/AndroidRuntime(372):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-04 19:31:30.478: E/AndroidRuntime(372):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-04 19:31:30.478: E/AndroidRuntime(372):  at dalvik.system.NativeStart.main(Native Method)
12-04 19:31:30.478: E/AndroidRuntime(372): Caused by: java.lang.IllegalStateException: Cannot add header view to list -- setAdapter has already been called.
12-04 19:31:30.478: E/AndroidRuntime(372):  at android.widget.ListView.addHeaderView(ListView.java:279)
12-04 19:31:30.478: E/AndroidRuntime(372):  at com.laurenswuyts.find.it.AndroidListViewActivity.onCreate(AndroidListViewActivity.java:80)
12-04 19:31:30.478: E/AndroidRuntime(372):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-04 19:31:30.478: E/AndroidRuntime(372):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
12-04 19:31:30.478: E/AndroidRuntime(372):  ... 11 more

Answer 1

我认为，你必须在setAdapter（）之前添加headerView，你可以在文档中阅读它 - addHeaderView()。

ListView将所有页眉和页脚保留在特殊适配器中，它包装适配器（来自setAdapter）。 WrapperAdapter将仅在setAdapter之前添加页脚或标题。当你尝试在setAdapter之后添加任何标题时，这就是你捕获错误的原因。

如果我匆匆得出结论，你可以提供更多代码吗？

列表视图中的标题

1 个答案: