如何在Android中将ResourceCursorTreeAdapter与展开和折叠的组视图一起使用?

如何在Android中将ResourceCursorTreeAdapter与展开和折叠的组视图一起使用?,android,expandablelistview,Android,Expandablelistview,如何将ResourceCursorTreeAdapter与以下构造函数一起使用 ResourceCursorTreeAdapter(Context context, Cursor cursor, int collapsedGroupLayout, int expandedGroupLayout, int childLayout) 我尝试使用一个如下所示的it: _resultsCursorTreeAdapter = new ResourceCursorTreeAdapter(_resultsL

如何将ResourceCursorTreeAdapter与以下构造函数一起使用

ResourceCursorTreeAdapter(Context context, Cursor cursor, int collapsedGroupLayout, int expandedGroupLayout, int childLayout)
我尝试使用一个如下所示的it:

_resultsCursorTreeAdapter = new ResourceCursorTreeAdapter(_resultsList.getContext(), _dbAdapter.getAllGroups(), 
        R.layout.timing_group_view_collapsed, R.layout.timing_group_view_expanded, R.layout.timing_result_view) {

 @Override
 protected Cursor getChildrenCursor(Cursor groupCursor) {
  // Given the group, we return a cursor for all the children within that group 
  int groupId = groupCursor.getInt(0);
  Cursor childCursor = _dbAdapter.getContractionsForGroup(groupId);
  return childCursor;
 }

 @Override
 protected void bindGroupView(View groupView, Context context, Cursor cursor,
     boolean isExpanded) {

  TimingGroupView timingGroupItem =  null;
  if(groupView instanceof LinearLayout){
   Log.i("TimingGroupView", "Has Header");
   LinearLayout layout = (LinearLayout)groupView;

   timingGroupItem = (TimingGroupView) layout.getChildAt(0);
  } else{
   Log.i("TimingGroupView", "No Header");
   timingGroupItem = (TimingGroupView) groupView;
  } 
 ...
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/timing_group_view"
 android:orientation="vertical" android:layout_width="fill_parent"
 android:layout_height="wrap_content" xmlns:android="http://schemas.android.com/apk/res/android"
 android:background="@color/header_timing_color">

 <com.contractiontracker.TimingGroupView
  android:id="@+id/timing_group_item" xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent" android:layout_height="wrap_content"
  android:layout_marginLeft="30px" android:padding="10dp"
  android:scrollbars="vertical" 
  android:fadingEdge="vertical" 
  android:background="@color/header_timing_color"
  android:textColor="@color/text_color"/>

 <com.contractiontracker.RowLayout android:id="@+id/timing_group_view"
  android:orientation="horizontal" android:layout_width="fill_parent"
  android:layout_height="wrap_content" xmlns:android="http://schemas.android.com/apk/res/android"
  android:background="@color/header_color" android:textColor="@color/text_color">

  <TextView android:id="@+id/interval_header"
   android:layout_width="fill_parent" android:layout_height="wrap_content"
   android:text="Interval" android:layout_weight="1"
   android:layout_gravity="left|bottom" android:gravity="center" 
   android:textColor="@color/text_color">
  </TextView>
  <TextView android:id="@+id/duration_header"
   android:layout_width="fill_parent" android:layout_height="wrap_content"
   android:text="Duration" android:layout_weight="1"
   android:layout_gravity="center_horizontal|bottom" android:gravity="center"
   android:textColor="@color/text_color"
   >
  </TextView>
  <TextView android:id="@+id/intensity_header"
   android:layout_width="fill_parent" android:layout_height="wrap_content"
   android:text="Intensity" android:layout_weight="1"
   android:layout_gravity="right|bottom" android:gravity="center"
   android:textColor="@color/text_color"
   >
  </TextView>
</com.contractiontracker.RowLayout>
</LinearLayout>
如果扩展了组节点,我希望组节点包含表的标题,表的每一行都保存在子节点中。timing_group_view_expanded.xml和timing_group_view_collapsed.xml显示在问题的底部。由于某些原因,无论组节点是展开还是折叠,都不会使用组视图展开。我用错了吗?是否有其他人能够使用此构造函数使ResourceCursorTreeAdapter工作

timing_group_view_expanded.xml如下所示:

_resultsCursorTreeAdapter = new ResourceCursorTreeAdapter(_resultsList.getContext(), _dbAdapter.getAllGroups(), 
        R.layout.timing_group_view_collapsed, R.layout.timing_group_view_expanded, R.layout.timing_result_view) {

 @Override
 protected Cursor getChildrenCursor(Cursor groupCursor) {
  // Given the group, we return a cursor for all the children within that group 
  int groupId = groupCursor.getInt(0);
  Cursor childCursor = _dbAdapter.getContractionsForGroup(groupId);
  return childCursor;
 }

 @Override
 protected void bindGroupView(View groupView, Context context, Cursor cursor,
     boolean isExpanded) {

  TimingGroupView timingGroupItem =  null;
  if(groupView instanceof LinearLayout){
   Log.i("TimingGroupView", "Has Header");
   LinearLayout layout = (LinearLayout)groupView;

   timingGroupItem = (TimingGroupView) layout.getChildAt(0);
  } else{
   Log.i("TimingGroupView", "No Header");
   timingGroupItem = (TimingGroupView) groupView;
  } 
 ...
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/timing_group_view"
 android:orientation="vertical" android:layout_width="fill_parent"
 android:layout_height="wrap_content" xmlns:android="http://schemas.android.com/apk/res/android"
 android:background="@color/header_timing_color">

 <com.contractiontracker.TimingGroupView
  android:id="@+id/timing_group_item" xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent" android:layout_height="wrap_content"
  android:layout_marginLeft="30px" android:padding="10dp"
  android:scrollbars="vertical" 
  android:fadingEdge="vertical" 
  android:background="@color/header_timing_color"
  android:textColor="@color/text_color"/>

 <com.contractiontracker.RowLayout android:id="@+id/timing_group_view"
  android:orientation="horizontal" android:layout_width="fill_parent"
  android:layout_height="wrap_content" xmlns:android="http://schemas.android.com/apk/res/android"
  android:background="@color/header_color" android:textColor="@color/text_color">

  <TextView android:id="@+id/interval_header"
   android:layout_width="fill_parent" android:layout_height="wrap_content"
   android:text="Interval" android:layout_weight="1"
   android:layout_gravity="left|bottom" android:gravity="center" 
   android:textColor="@color/text_color">
  </TextView>
  <TextView android:id="@+id/duration_header"
   android:layout_width="fill_parent" android:layout_height="wrap_content"
   android:text="Duration" android:layout_weight="1"
   android:layout_gravity="center_horizontal|bottom" android:gravity="center"
   android:textColor="@color/text_color"
   >
  </TextView>
  <TextView android:id="@+id/intensity_header"
   android:layout_width="fill_parent" android:layout_height="wrap_content"
   android:text="Intensity" android:layout_weight="1"
   android:layout_gravity="right|bottom" android:gravity="center"
   android:textColor="@color/text_color"
   >
  </TextView>
</com.contractiontracker.RowLayout>
</LinearLayout>

timing_group_view_collapsed.xml如下所示:

<?xml version="1.0" encoding="utf-8"?>
<com.contractiontracker.TimingGroupView 
  android:id="@+id/timing_group_item"
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_marginLeft="50px" 
 android:padding="10dp"
 android:scrollbars="vertical"
 android:textColor="@color/text_color"
 android:fadingEdge="vertical"/>

以下是我针对SimpleExpandableListAdapter的临时解决方案:

public class LocalAdapter extends SimpleExpandableListAdapter {
    private List<? extends Map<String, ?>> mGroupData;
    private String[] mGroupFrom;
    private int[] mGroupTo;

    private List<? extends List<? extends Map<String, ?>>> mChildData;

    private LayoutInflater mInflater;

    public LocalAdapter(Context context,
            List<? extends Map<String, ?>> groupData, int groupLayout,
            String[] groupFrom, int[] groupTo,
            List<? extends List<? extends Map<String, ?>>> childData,
            int childLayout, String[] childFrom, int[] childTo) {
        this(context, groupData, groupLayout, groupLayout, groupFrom, groupTo, childData,
                childLayout, childLayout, childFrom, childTo);
    }

    public LocalAdapter(Context context,
            List<? extends Map<String, ?>> groupData, int expandedGroupLayout,
            int collapsedGroupLayout, String[] groupFrom, int[] groupTo,
            List<? extends List<? extends Map<String, ?>>> childData,
            int childLayout, String[] childFrom, int[] childTo) {
        this(context, groupData, expandedGroupLayout, collapsedGroupLayout,
                groupFrom, groupTo, childData, childLayout, childLayout,
                childFrom, childTo);
    }

    public LocalAdapter(Context context,
            List<? extends Map<String, ?>> groupData, int expandedGroupLayout,
            int collapsedGroupLayout, String[] groupFrom, int[] groupTo,
            List<? extends List<? extends Map<String, ?>>> childData,
            int childLayout, int lastChildLayout, String[] childFrom,
            int[] childTo) {

        super(context, groupData, expandedGroupLayout,
                collapsedGroupLayout, groupFrom, groupTo, childData,
                childLayout, lastChildLayout, childFrom, childTo);

        mGroupData = groupData;
        mGroupFrom = groupFrom;
        mGroupTo = groupTo;
        mChildData = childData;
        mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }        

    private void bindView(View view, Map<String, ?> data, String[] from, int[] to) {
        int len = to.length;

        for (int i = 0; i < len; i++) {
            TextView v = (TextView)view.findViewById(to[i]);
            if (v != null) {
                v.setText((String)data.get(from[i]));
            }
        }
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
            ViewGroup parent) {
        View v = newGroupView(isExpanded, parent);
        bindView(v, mGroupData.get(groupPosition), mGroupFrom, mGroupTo);
        return v;
    }
}
公共类LocalAdapter扩展了SimpleExpandableListAdapter{ 私有列表>管理器组数据; 私有字符串[]mGroupFrom; 私人int[]管理组; 私人列表>>麦克希尔达; 私人停车场; 公共LocalAdapter(上下文, 列表>组数据,int-groupLayout, 字符串[]groupFrom,int[]groupTo, 列表>>儿童数据, int childLayout,字符串[]childFrom,int[]childTo){ 这(上下文、groupData、groupLayout、groupLayout、groupFrom、groupTo、childData、, childLayout、childLayout、childFrom、childTo); } 公共LocalAdapter(上下文, 列表>组数据,int expandedGroupLayout, int collapsedGroupLayout,字符串[]groupFrom,int[]groupTo, 列表>>儿童数据, int childLayout,字符串[]childFrom,int[]childTo){ 这(上下文、groupData、expandedGroupLayout、collapsedGroupLayout、, groupFrom、groupTo、childData、childLayout、childLayout、, childFrom,childTo); } 公共LocalAdapter(上下文, 列表>组数据,int expandedGroupLayout, int collapsedGroupLayout,字符串[]groupFrom,int[]groupTo, 列表>>儿童数据, int childLayout,int lastChildLayout,字符串[]childFrom, int[]childTo){ 超级(上下文、组数据、expandedGroupLayout、, collapsedGroupLayout、groupFrom、groupTo、childData、, childLayout、lastChildLayout、childFrom、childTo); mGroupData=groupData; mGroupFrom=groupFrom; mGroupTo=groupTo; mChildData=childData; mInflater=(LayoutInflater)context.getSystemService(context.LAYOUT\u充气机\u服务); } 私有void bindView(视图视图,映射数据,字符串[]from,int[]to){ int len=to.length; 对于(int i=0;i问题在于
ResourceCursorTreeAdapter
仅在创建视图时创建正确的布局。因此,如果一个组被折叠或展开,则不会再次调用
newGroupView()
,因此传递到构造函数中的不同组布局不会按预期使用

当对正常子布局和最后一个子布局使用不同布局时,子布局也存在同样的问题。它发生在那里,甚至不改变数据!重新扩展组后,第一个组具有页脚布局,反之亦然。完全随机,不基于列表中的位置

正如Aleksander O在其示例中所示,可以通过始终在
getGroupView
方法中调用
newGroupView()
来解决此问题(如果使用不同的布局,则分别调用
getChildView

为了避免总是创建新视图,我尝试了一种适用于我的案例的不同方法:

  • 向用于组/子视图的布局的根元素添加不同的ID
  • 将这些视图ID存储为我的适配器的int成员:

    // Get the view ids for comparison
    View view = newGroupView(mContext, null, false, null);
    mCollapsedGroupLayoutViewId = view.getId();
    view = newGroupView(mContext, null, true, null);
    mExpandedGroupLayoutViewId = view.getId();
    
    view = newChildView(mContext, null, false, null);
    mChildLayoutViewId = view.getId();
    view = newChildView(mContext, null, true, null);
    mLastChildLayoutViewId = view.getId();
    
  • getGroupView的实现(以及与getChildView的模拟):


简单的解决方案,良好的回收利用

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    Cursor cursor = getGroup(groupPosition);
    if (cursor == null) {
        throw new IllegalStateException("this should only be called when the cursor is valid");
    }

    View view;
    if (convertView == null || convertView.getTag() != isExpanded) {
        view = newGroupView(mActivity, cursor, isExpanded, parent);
        view.setTag(isExpanded);
    } else {
        view = convertView;
    }
    bindGroupView(view, mActivity, cursor, isExpanded);
    return view;
}

谢谢你的回答。但根据我的经验,当我点击组以展开/折叠它时,甚至不会调用
getGroupView(…)
。相反,它需要一些滚动,直到最后调用
getGroupView(…)
并更新
groupView
。点击
groupView
时,是否有人立即更改了它的布局?@hadi很抱歉我的回复太晚了。我仍然在我的一个应用程序中使用答案中显示的解决方案。直接在组上单击并隐藏所有子视图时切换布局可见性效果良好。也许你可以打开一个新的问题,展示你的代码片段和关于测试设备的信息,这些设备不能立即工作。谢谢你的解决方案,+1。但是,我们可以省略第二步(将视图id存储为适配器的成员),因为我们已经在布局xml文件中添加了id(@+id/group_折叠,@+id/group_展开,…),等等)。所以,在第三步中,在代码中,只需比较convertView.getId()==R.id.group_,…etc没问题。我认为您需要检查
convertview==null
,否则每次创建新的groupview时,列表项概念的循环在这里都不起作用,从而导致scroll等中的性能不足。如果解释一下如何解决问题,这个答案会更有帮助。