android - 多级 ExpandableListView 中的项目并不总是可点击

Question

我根据互联网上的许多示例制作了一个普通的 3 级 ExpandableListView，并且效果很好。

有一个警告。单击第 2 级和第 3 级并不总是有效。虽然有时它工作正常。通常在开始时它无处不在。然后它不再适用于大约 50% 的项目。没有任何逻辑。有时我展开第二组，然后我不能再折叠那个组了。或者有时我扩展第二组，然后我无法折叠第二级的任何其他组。唯一一致的是，它通常通过将锁定的 View 滚动出可见区域并返回来修复。

可能发生了什么？

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.chooselib);

        //...

        ExpandableListView lv = (ExpandableListView) findViewById(R.id.libListView);
        lv.setAdapter(new LibraryListAdapter());
    }

    final List<String> states = new ArrayList<String>();
    final List<List<String>> cities = new ArrayList<List<String>>();
    final List<List<List<Map<String, String>>>> localLibs = new ArrayList<List<List<Map<String, String>>>>();



    public abstract class LibraryListBaseAdapter extends BaseExpandableListAdapter{ //changing these functions has no effect whatsoever on the problem
        @Override
        public Object getChild(int groupPosition, int childPosition)
        {
            return getChildId(groupPosition, childPosition);
        }

        @Override
        public long getChildId(int groupPosition, int childPosition)
        {
            return (groupPosition << 15) + childPosition + 1;
        }

        @Override
        public Object getGroup(int groupPosition)
        {
            return getGroupId(groupPosition);
        }

        @Override
        public long getGroupId(int groupPosition)
        {
            return (groupPosition << 15);
        }

        @Override
        public boolean hasStableIds()
        {
            return true;
        }

        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition)
        {
            return true;
        }
    }


    public class LibraryListAdapter extends LibraryListBaseAdapter
    {
        Map<Integer, ExpandableListView> cache = new TreeMap<Integer, ExpandableListView>();
        @Override
        public View getChildView(final int groupPosition, final int childPosition,
                                 boolean isLastChild, View convertView, ViewGroup parent)
        {
            if (cache.containsKey(groupPosition*10000 + childPosition))
                return cache.get(groupPosition*10000 + childPosition);
            LibraryListCityView l = new LibraryListCityView();
            l.setPadding((int)(60 * getResources().getDisplayMetrics().density), l.getPaddingTop(), l.getPaddingRight(), l.getPaddingBottom());
            //l.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)); has no effect whatsoever
            //l.setFocusable(true); has no effect whatsoever

            l.setAdapter(new LibraryListCityAdapter(groupPosition,childPosition));
            if (cities.get(groupPosition).size() == 1) l.expandGroup(0);

            l.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
                @Override
                public boolean onChildClick(ExpandableListView expandableListView, View view, int i, int lib, long l) {
                    onLeafClick(groupPosition,childPosition,lib);
                    return false;
                }
            });

            cache.put(groupPosition*10000 + childPosition, l);
            return l;
        }

        @Override
        public int getChildrenCount(int groupPosition)
        {
            return cities.get(groupPosition).size();
        }

        @Override
        public int getGroupCount()
        {
            return states.size();
        }

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                                 View convertView, ViewGroup parent)
        {
            View row = //convertView != null && convertView instanceof TextView ? convertView :
                    getLayoutInflater().inflate(android.R.layout.simple_expandable_list_item_1, parent, false);
            ((TextView) row).setText(states.get(groupPosition));
            return row;
        }
    }

    public class LibraryListCityView extends ExpandableListView
    {
        int intGroupPosition, intChildPosition, intGroupid;
        public LibraryListCityView()
        {
            super(LibraryList.this);
        }
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
        {
            widthMeasureSpec = MeasureSpec.makeMeasureSpec(MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.EXACTLY);
            heightMeasureSpec = MeasureSpec.makeMeasureSpec(2000, MeasureSpec.AT_MOST); //what does this do?
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }

        //from http://stackoverflow.com/questions/19298155/issue-with-expanding-multi-level-expandablelistview
        @Override
        protected void onDetachedFromWindow() {
            try {
                super.onDetachedFromWindow();
            } catch (IllegalArgumentException e) {
                // TODO: Workaround for http://code.google.com/p/android/issues/detail?id=22751
            }
        }
    }

    public class LibraryListCityAdapter extends LibraryListBaseAdapter
    {
        int state,city;

        LibraryListCityAdapter (int a, int b) {
            state = a;
            city = b;
        }

        @Override
        public View getChildView(int groupPosition, int childPosition,
                                 boolean isLastChild, View convertView, ViewGroup parent)
        {
            //todo: use convertView (but do not want to mix groupView/childView up)
            View row = getLayoutInflater().inflate(R.layout.libraryinlistview , parent, false);
            ((TextView) row).setText(localLibs.get(state).get(city).get(childPosition).get("NAME"));
            return row;
        }

        @Override
        public int getChildrenCount(int groupPosition)
        {
            return localLibs.get(state).get(city).size();
        }


        @Override
        public int getGroupCount()
        {
            return 1;
        }

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                                 View convertView, ViewGroup parent)
        {
            View row = getLayoutInflater().inflate(R.layout.librarycityinlistview, parent, false);
            ((TextView) row).setText(cities.get(state).get(city));
            return row;
        }

    }

选择lib.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/lay_chooselib_choose"
            android:id="@+id/textView" android:layout_gravity="center_vertical|left" android:padding="5sp"/>
    <ExpandableListView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/libListView" android:layout_gravity="right|center_vertical"
            />
</LinearLayout>

librarycityinlistview.xml:

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@android:id/text1"
          android:layout_width="fill_parent"
          android:layout_height="?android:attr/listPreferredItemHeight"
          android:gravity="center_vertical"
          android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft"
          android:singleLine="true"
          android:textAppearance="?android:attr/textAppearanceListItem"
        />

libraryinlistview.xml:

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@android:id/text1"
          android:layout_width="fill_parent"
          android:layout_height="?android:attr/listPreferredItemHeight"
          android:paddingLeft="60dip"
          android:gravity="center_vertical"
        />

听起来有点像https://code.google.com/p/android/issues/detail?id=3414但有点相反(因为有问题的列表是外部 ListView 的一个项目)，并且改变 descand 可聚焦性并没有改变任何东西。 (因为列表中只有 TextView ，所以它们无论如何都不可聚焦)。 logcat 中也没有任何用处

我不太了解我所基于的来源是 onMeasure 中的内容。以及 ListView 的组和子项之间的拆分。或许为第 1 级的每个组提供一个可扩展的 ListView 会更好，而不是为第 2 级的每个组提供一个？

Answer 1

查看您的代码，我注意到您的 hasStableIds 方法返回 true，但 getGroupId 和 getChildId 返回基于位置变量的值。我认为这混淆了 ExpandableListView 逻辑。仅当您的对象具有不可变的唯一 ID 时，hasStableIds 才应返回 true。