android expandablelistview不展开也不接收点击事件

Question

我这辈子都弄不明白为什么我的 ExpandableListView 没有展开...我在几乎所有我能找到的 ExpandableListView 的点击监听器中都使用了日志语句，但看起来它们都没有得到叫。

我知道有很多关于这个主题的帖子，但我已经通读了所有帖子并尝试了很多东西，但运气不佳，希望我遗漏了一些其他人很容易发现的小错误。

主要 Activity :

public class ForumListActivity extends Activity  {

    private static ArrayList<Forum> forumList;
    private static ArrayList<ArrayList<SubForum>> subForumList;
    private ExpandableListView forumListView;
    private ForumListAdapter forumListAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.main_page);
        this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

        forumListView = (ExpandableListView) this.findViewById(R.id.main_page_forum_list);

        forumList = new ArrayList<Forum>();
        subForumList = new ArrayList<ArrayList<SubForum>>();
        setUpForums(this);

        forumListAdapter = new ForumListAdapter(this, forumList, subForumList);
        forumListView.setAdapter(forumListAdapter);

        forumListView.setOnGroupExpandListener(new OnGroupExpandListener(){
            @Override
            public void onGroupExpand(int groupPosition) {
                Log.d("onGroupExpand", "this works?");
                for(int i=0; i<forumListAdapter.getGroupCount(); i++) {
                    if(i != groupPosition) 
                        forumListView.collapseGroup(groupPosition);
                }
            }
        });

        forumListView.setOnGroupClickListener(new OnGroupClickListener() {
            @Override
            public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
                Log.d("onGroupClick:", "worked");
                parent.expandGroup(groupPosition);
                return true;
            }
        });
    }

注意:方法 setUpForums() 只是获取系统数组并将它们放入 forumList 和 subForumList

ListView 适配器:

public class ForumListAdapter extends BaseExpandableListAdapter {

    private ArrayList<Forum> groups;
    private ArrayList<ArrayList<SubForum>> children;
    private Context ctx;

    public ForumListAdapter(Context ctx, ArrayList<Forum> groups, ArrayList<ArrayList<SubForum>> children) {
        this.ctx = ctx;
        this.groups = groups;
        this.children = children;
    }



    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return children.get(groupPosition).get(childPosition);
    }



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



    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(ctx);
            convertView = inflater.inflate(R.layout.forum_list_child_item_row, null);
        }

        SubForum currentSubForum = children.get(groupPosition).get(childPosition);
        TextView name = (TextView)convertView.findViewById(R.id.child_row_forum_title);
        TextView desc = (TextView)convertView.findViewById(R.id.child_row_forum_description);

        if (name != null)
            name.setText(currentSubForum.getName());

        if (desc != null)
            desc.setText(currentSubForum.getDescription());

        convertView.setFocusableInTouchMode(true);
        return convertView;
    }



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



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



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



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



    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        if (convertView == null)
        {
            LayoutInflater inflater = LayoutInflater.from(ctx);
            convertView = inflater.inflate(R.layout.forum_list_group_item_row, null);
        }

        Forum currentForum = (Forum) groups.get(groupPosition);
        TextView name = (TextView) convertView.findViewById(R.id.group_item_forum_title);
        //ImageView image = (ImageView) convertView.findViewById(R.id.group_item_expander_image);

        if(name != null)
            name.setText(currentForum.getName());           

        /*
        if(image != null) {
            int[][] group_state_sets = {{}, {android.R.attr.state_expanded}};
            image.setVisibility(View.VISIBLE);  
            int stateSetIndex = (isExpanded ? 1 : 0) ;  
            Drawable drawable = image.getDrawable();  
            drawable.setState(group_state_sets[stateSetIndex]);  
        }
        */

        return convertView;
    }



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



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


}

组布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/turquoise_gradient"
    android:orientation="horizontal"
    android:paddingTop="6dip"
    android:paddingBottom="6dip"
    android:paddingLeft="6dip" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/turquoise_gradient"
        android:orientation="vertical"
        android:padding="2dip" >

        <TextView
            android:id="@+id/group_item_forum_title"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical|left"
            android:gravity="left"
            android:paddingLeft="5dip"
            android:textColor="@color/white"
            android:textSize="16dip" />

    </LinearLayout>

    <!--  
    <LinearLayout 
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        android:gravity="center|right">

        <ImageView
            android:id="@+id/group_item_expander_image"
            android:focusable="false"
            android:focusableInTouchMode="false"
            android:gravity="center"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:src="@drawable/collapse_down" />


    </LinearLayout> -->

</LinearLayout>

子布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/turquoise_gradient"
    android:orientation="horizontal"
    android:paddingTop="6dip"
    android:paddingBottom="6dip"
    android:paddingLeft="6dip" >


    <LinearLayout 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="2dip"
        android:background="@drawable/turquoise_gradient" >

        <TextView
            android:id="@+id/child_row_forum_title"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="left"
            android:layout_gravity="center_vertical"
            android:paddingLeft="5dip"
            android:textColor="@color/white"
            android:maxLines="1"
            android:textSize="11dip"  />

         <TextView
            android:id="@+id/child_row_forum_description"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="left"
            android:layout_gravity="center_vertical"
            android:paddingLeft="15dip"
            android:textColor="@color/white"
            android:maxLines="2"
            android:textSize="11dip"  />

    </LinearLayout>

</LinearLayout>

主页布局:

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

    <ExpandableListView
        android:id="@+id/main_page_forum_list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@color/black"
        android:divider="@color/black"
        android:dividerHeight="1dip"
        android:clickable="true" />

</LinearLayout>

非常感谢您提供的任何帮助!

Answer 1

我也遇到过和你一样的问题。经过几天的调查，我发现我做错了。所以我通过做一些小改动来修复它以使其正常工作。

让我们看一下 setOnGroupClickListener 中 boolean onGroupClick(...) 的主体。你返回了 true 这意味着 "the click was handled"

如果你想展开，你应该返回false。所以我建议你这样做:

forumListView.setOnGroupClickListener(new OnGroupClickListener() {
    @Override
    public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
            Log.d("onGroupClick:", "worked");
            parent.expandGroup(groupPosition);
            return false;
        }
    });

在android.widget.ExpandableListView类中，有一个名为boolean handleItemClick(View v, int position, long id)的方法负责展开/折叠组或将点击传递给适当的 child 。

 /* It's a group click, so pass on event */
         if (mOnGroupClickListener != null) {
             if (mOnGroupClickListener.onGroupClick(this, v,
                     posMetadata.position.groupPos, id)) {
                 posMetadata.recycle();
                 return true;
             }
         }

  /* expanding/collapsing/other tasks... */

如果您实现 onGroupClick 以返回 true，则第 8 行以下的代码将永远不会执行。 (这意味着，组永远不会折叠、展开)

希望我的回答对您有所帮助:-)祝您好运!