Python中文网

一个关于 编程问题的解答网站.

有 Java 编程相关的问题?

你可以在下面搜索框中键入要查询的问题!

java如何膨胀合并

4 月 Questions & Answers

我通过适配器创建了一个帐户设置页面，其中包含选项的部分标题和列表视图。列表视图是一个“合并”视图，因此可以将其包含到主文件中。然而，似乎合并文件的思想是不能膨胀的

这是我得到的错误：

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.archive.pod, PID: 13046
安卓.view.InflateException: Binary XML file line #1 in com.archive.pod:layout/layout_center_accountsettings: <merge /> can be used only with a valid ViewGroup root and attachToRoot=true
Caused by: 安卓.view.InflateException: <merge /> can be used only with a valid ViewGroup root and attachToRoot=true
    at 安卓.view.LayoutInflater.inflate(LayoutInflater.java:652)
    at 安卓.view.LayoutInflater.inflate(LayoutInflater.java:534)
    at com.archive.pod.Profile.AccountSettingsAdapter.getView(AccountSettingsAdapter.java:66)
    at 安卓.widget.AbsListView.obtainView(AbsListView.java:2405)
    at 安卓.widget.ListView.makeAndAddView(ListView.java:2071)
    at 安卓.widget.ListView.fillDown(ListView.java:797)
    at 安卓.widget.ListView.fillFromTop(ListView.java:859)
    at 安卓.widget.ListView.layoutChildren(ListView.java:1842)
    at 安卓.widget.AbsListView.onLayout(AbsListView.java:2202)
    at 安卓.view.View.layout(View.java:22466)
    at 安卓.view.ViewGroup.layout(ViewGroup.java:6304)
    at 安卓.widget.RelativeLayout.onLayout(RelativeLayout.java:1103)
    at 安卓.view.View.layout(View.java:22466)
    at 安卓.view.ViewGroup.layout(ViewGroup.java:6304)
    at 安卓.widget.RelativeLayout.onLayout(RelativeLayout.java:1103)
    at 安卓.view.View.layout(View.java:22466)
    at 安卓.view.ViewGroup.layout(ViewGroup.java:6304)
    at 安卓.widget.RelativeLayout.onLayout(RelativeLayout.java:1103)
    at 安卓.view.View.layout(View.java:22466)
    at 安卓.view.ViewGroup.layout(ViewGroup.java:6304)
    at 安卓x.coordinatorlayout.widget.CoordinatorLayout.layoutChild(CoordinatorLayout.java:1183)
    at 安卓x.coordinatorlayout.widget.CoordinatorLayout.onLayoutChild(CoordinatorLayout.java:870)
    at 安卓x.coordinatorlayout.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:889)
    at 安卓.view.View.layout(View.java:22466)
    at 安卓.view.ViewGroup.layout(ViewGroup.java:6304)
    at 安卓.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
    at 安卓.widget.FrameLayout.onLayout(FrameLayout.java:270)
    at 安卓.view.View.layout(View.java:22466)
    at 安卓.view.ViewGroup.layout(ViewGroup.java:6304)
    at 安卓.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
    at 安卓.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
    at 安卓.widget.LinearLayout.onLayout(LinearLayout.java:1582)
    at 安卓.view.View.layout(View.java:22466)
    at 安卓.view.ViewGroup.layout(ViewGroup.java:6304)
    at 安卓.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
    at 安卓.widget.FrameLayout.onLayout(FrameLayout.java:270)
    at 安卓.view.View.layout(View.java:22466)
    at 安卓.view.ViewGroup.layout(ViewGroup.java:6304)
    at 安卓.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
    at 安卓.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
    at 安卓.widget.LinearLayout.onLayout(LinearLayout.java:1582)
    at 安卓.view.View.layout(View.java:22466)
    at 安卓.view.ViewGroup.layout(ViewGroup.java:6304)
    at 安卓.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
    at 安卓.widget.FrameLayout.onLayout(FrameLayout.java:270)
    at com.安卓.internal.policy.DecorView.onLayout(DecorView.java:779)
    at 安卓.view.View.layout(View.java:22466)
    at 安卓.view.ViewGroup.layout(ViewGroup.java:6304)
    at 安卓.view.ViewRootImpl.performLayout(ViewRootImpl.java:3157)
    at 安卓.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2614)
    at 安卓.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1745)
    at 安卓.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7768)
    at 安卓.view.Choreographer$CallbackRecord.run(Choreographer.java:967)
    at 安卓.view.Choreographer.doCallbacks(Choreographer.java:791)
    at 安卓.view.Choreographer.doFrame(Choreographer.java:726)
    at 安卓.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:952)
    at 安卓.os.Handler.handleCallback(Handler.java:883)
    at 安卓.os.Handler.dispatchMessage(Handler.java:100)
    at 安卓.os.Looper.loop(Looper.java:214)
    at 安卓.app.ActivityThread.main(ActivityThread.java:7356)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.安卓.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:930)

合并ListView文件布局\u中心\u帐户设置。xml

<merge xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"> <RelativeLayout 安卓:layout_width="match_parent" 安卓:layout_height="match_parent" 安卓:padding="30dp" 安卓:background="@color/windowBackground"> <ListView 安卓:id="@+id/lvAccountSettings" 安卓:layout_width="match_parent" 安卓:layout_height="match_parent" 安卓:divider="@null" 安卓:dividerHeight="0dp"> </ListView> </RelativeLayout> </merge>

帐户设置适配器。爪哇

package com.archive.pod.Profile; import 安卓.content.Context; import 安卓.view.LayoutInflater; import 安卓.view.View; import 安卓.view.ViewGroup; import 安卓.widget.BaseAdapter; import 安卓.widget.TextView; import com.archive.pod.R; import java.util.ArrayList; public class AccountSettingsAdapter extends BaseAdapter { ArrayList < Object > list; private static final int OPTIONS = 0; private static final int HEADER = 1; private LayoutInflater inflater; public AccountSettingsAdapter(Context context, ArrayList < Object > list) { this.list = list; inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public int getItemViewType(int position) { if (list.get(position) instanceof AccountSettingsOptions) { return OPTIONS; } else { return HEADER; } } @Override public int getViewTypeCount() { return 2; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int i) { return list.get(i); } @Override public long getItemId(int i) { return i; } /** This distinguishes between section title and list view options, then using switch it beings to populate the options in the list view with titles and descriptions */ @Override public View getView(int i, View view, ViewGroup viewGroup) { if (view == null) { switch (getItemViewType(i)) { case OPTIONS: view = inflater.inflate(R.layout.layout_center_accountsettings, null); break; case HEADER: view = inflater.inflate(R.layout.listview_section_header_accountsettings, null); break; } } switch (getItemViewType(i)) { case OPTIONS: TextView name = view.findViewById(R.id.listViewTitle); TextView description = view.findViewById(R.id.listViewDescription); name.setText(((AccountSettingsOptions) list.get(i)).getName()); description.setText(((AccountSettingsOptions) list.get(i)).getDescription()); break; case HEADER: TextView title = view.findViewById(R.id.optionListViewHeader); title.setText(((String) list.get(i))); break; } return view; } }

这个问题的简单解决方案是什么？我看过以前的帖子，但不能完全理解他们做了什么


共 (1) 个答案

  1. # 1 楼答案

    因为getView要求您只返回一个View，很遗憾，您不能通过适配器将<merge>作为ListView的直接子级<merge>标记只能膨胀到父级中——这里不是这样，因为getView需要使用attachToRoot = false进行膨胀，以便它可以附加视图本身。您需要将其包装在单亲布局中，例如LinearLayout

    另外一个警告是：您的项目布局中似乎有一个ListViewListView不能很好地处理嵌套滚动——如果需要，可以查看RecyclerView