【发布时间】：2014-08-19 10:59:02
【问题描述】：
我根据网上很多例子做了一个普通的3级ExpandableListView，效果很好。
有一个警告。单击第 2 层和第 3 层并不总是有效。虽然有时它工作得很好。通常在开始时它可以在任何地方工作。然后它就不再起作用了，就像 50% 的项目一样。没有任何逻辑。有时我展开第二组，然后我不能再折叠该组。或者有时我展开第二组，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视图滚动出可见区域并返回来修复。
会发生什么？
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，但恰恰相反（因为有问题的列表是外部列表视图的一个项目），并且更改 descand 可聚焦性并没有改变任何东西。 （因为只有文本视图在列表中，所以它们无论如何都不能聚焦）。在 logcat 中也没有任何用处
我对我所依据的来源不太了解的是 onMeasure 中的内容。以及列表视图的组和子项之间的拆分。也许最好为第一级的每个组提供一个可扩展的列表视图，而不是为第二级的每个组提供一个可扩展的列表视图？
【问题讨论】：
-
我觉得和this有关
-
你确定你没有完成缓存吗？ ListView 重用子视图，如果您不重新初始化 *all 侦听器。到正确的（新）数据，您的听众将更新不正确的子视图。
-
@mach：我在每个侦听器中都有一个日志记录语句。当问题发生时，永远不会调用侦听器（或仅在父崩溃之后，如链接问题中）
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尝试删除 if (cache.containsKey(groupPosition*10000 + childPosition)) return cache.get(groupPosition*10000 + childPosition);看看它是否有效
-
@mach：哦，到目前为止，它似乎已经修复了。但是为什么，这与他们在链接线程中必须做的相反。
标签： android android-listview expandablelistview expandablelistadapter