Question

所以，我创建了一个自定义的ExpandableListAdapter，因为我想要一个可扩展的列表，它可以有多个子节点，基本上是一个双层列表。它一直工作得很好，只要它是活动中的第一个也是唯一的视图。但是，我最近在其所在的LinearLayout中添加了一些其他视图（一组TextView），并且突然它完全停止显示，而没有给出任何错误。

首先，我想知道是否由于某种原因需要成为活动中的第一个/唯一一个视图，如果是的话，是否有任何方法来解决这个问题。代码如下。

expListView = (ExpandableListView) this.findViewById(R.id.finalcalculation_list_view);
final ExpandableListAdapter expListAdapter = new ExpandableListAdapter(
        this, groupList, totalCollection);
expListView.setAdapter(expListAdapter);

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

    <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" > 

        <!-- Here are some TextViews -->

    </LinearLayout>

    <ScrollView android:id="@+id/finalcalculation_scrollview"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

        <ExpandableListView
        android:id="@+id/finalcalculation_list_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        </ExpandableListView>

    </ScrollView>

</LinearLayout>

以下是它最初的工作原理：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

    <ExpandableListView
    android:id="@+id/finalcalculation_list_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    </ExpandableListView>

</LinearLayout>

不幸的是，这是我的ExpandableListAdapter的大型代码转储。

public class ExpandableListAdapter extends BaseExpandableListAdapter {

    private Activity context;
    private Map<String, List<String>> collections;
    private List<String> groups;

    public ExpandableListAdapter(Activity context, List<String> groups,
            Map<String, List<String>> collections) {
        this.context = context;
        this.collections = collections;
        this.groups = groups;
    }

    public Object getChild(int groupPosition, int childPosition) {
        return collections.get(groups.get(groupPosition)).get(childPosition);
    }

    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    public View getChildView(final int groupPosition, final int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        final String laptop = (String) getChild(groupPosition, childPosition);
        LayoutInflater inflater = context.getLayoutInflater();

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.finalcalculation_child_item, null);
        }

        TextView item = (TextView) convertView.findViewById(R.id.finalcalculation_child_item_textview);

        item.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(context);
                builder.setMessage("Do you want to remove?");
                builder.setCancelable(false);
                builder.setPositiveButton("Yes",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                List<String> child = 
                                    collections.get(groups.get(groupPosition));
                                child.remove(childPosition);
                                notifyDataSetChanged();
                            }
                        });
                builder.setNegativeButton("No",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                dialog.cancel();
                            }
                        });
                AlertDialog alertDialog = builder.create();
                alertDialog.show();
            }
        });

        item.setText(laptop);
        return convertView;
    }

    public int getChildrenCount(int groupPosition) {
        return collections.get(groups.get(groupPosition)).size();
    }

    public Object getGroup(int groupPosition) {
        return groups.get(groupPosition);
    }

    public int getGroupCount() {
        return groups.size();
    }

    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        String itemName = (String) getGroup(groupPosition);

        if (convertView == null) {
            LayoutInflater groupInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = groupInflater.inflate(R.layout.finalcalculation_group_item, null);
        }
        TextView item = (TextView) convertView.findViewById(R.id.finalcalculation_group_item_textview);
        item.setTypeface(null, Typeface.BOLD);
        item.setText(itemName);
        return convertView;
    }

    public boolean hasStableIds() {
        return true;
    }

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

我尝试从

更改getChildView和getGroupView的Inflators

convertView = inflater.inflate(R.layout.finalcalculation_child_item, null);

到两个

convertView = inflater.inflate(R.layout.finalcalculation_child_item, parent, false); //AND
convertView = inflater.inflate(R.layout.finalcalculation_child_item, parent, true); //AND

但它要么不起作用，要么引发错误。

非常感谢所有帮助和意见。

Answer 1

嵌套layout_height的{{1}}设置为LinearLayout，这会导致嵌套match_parent与父LinearLayout的高度相同并隐藏LinearLayout。它应该是ScrollView或固定大小。此外，您不需要wrap_content。

尝试这样的事情：

ScrollView

ExpandableListView和ExpandableListAdapter的行为问题

1 个答案: