12

我一辈子都想不通为什么我的 ExpandableListView 没有展开……我几乎在每个可以为 ExpandableListView 找到的点击监听器中都使用了日志语句，而且看起来它们中的任何一个都没有被调用。

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事情并且没有运气，希望我错过了一些容易被其他人发现的小错误。

主要活动：

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

列表视图适配器：

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;
    }


}

分组布局：

<?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>

主页面布局：

<?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！

4

11 回答 11

25

我也遇到了和你类似的问题。经过几天的调查，我发现我做错了什么。所以我通过做一些小改动来修复它以使其正常工作。

boolean onGroupClick(...)让我们看一下in的主体setOnGroupClickListener。您已返回true，这意味着“点击已处理”

如果要扩展，则应返回 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课堂上，有一个名为的方法boolean handleItemClick(View v, int position, long id)负责展开/折叠组或将点击传递给正确的孩子。

 /* 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返回true，则第 8 行以下的代码将永远不会被执行。（也就是说，组永远不会被折叠、扩展）

希望我的回答对您有所帮助:-) 祝你好运！

于 2012-07-14T16:02:51.327 回答
25

如果您的列表项上有一个小部件，例如按钮，您可能必须添加android:focusable="false"到它。按钮不允许单击我的列表项。这就是我的问题。

于 2015-07-10T16:41:25.413 回答
7

您可能需要检查三件事，

  1. 检查您是否有任何可用于孩子的数据，因为如果您没有任何数据，孩子根本不会出现。

2.尝试在使用布局充气器时删除 if 条件检查

 if (convertView == null) {
    LayoutInflater inflater = LayoutInflater.from(ctx);
    convertView = inflater.inflate(R.layout.forum_list_child_item_row, null);
    }

  1. 你还需要通过Viewgroup这里

      convertView = inflater.inflate(R.layout.forum_list_child_item_row,parent, false);
于 2012-06-13T05:07:58.053 回答
5

我知道这已经得到了回答，但是尝试将您要充气的任何内容的基本布局设置为具有该属性： 

android:descendantFocusability="blocksDescendants"
于 2016-08-31T15:21:39.203 回答
4

如果您的可扩展列表视图父级有按钮或开关，它不会被调用，我在此浪费了一整天。所以只需使用下面的代码

android:focusable="false"
android:focusableInTouchMode="false"

将此代码添加到切换按钮、切换按钮或可扩展列表视图中的任何内容

于 2018-04-11T05:50:11.333 回答
3

确保您的自定义组布局不具有android:textIsSelectable="false"“真”，如果 textview 中的文本设置为可选，可扩展列表视图将在姜饼中扩展，但在 jellybean 中不扩展，并且可能在 ICS 中也不起作用。

于 2013-03-02T08:11:27.157 回答
1

我有一个类似的问题，它是通过android:clickable="true"从 xml 上的 ExpandableListView 中删除属性来解决的。

于 2014-12-17T13:49:13.980 回答
0

forumListView.collapseGroup( groupPosition );

应该

forumListView.collapseGroup( i );

于 2015-03-14T21:38:11.130 回答
0

当您使用可扩展列表时，组扩展是其中的默认功能。意味着该组仅在您单击它时才会自行扩展，您不需要覆盖 onGroupExpand(int groupPosition) 或任何其他方法，只需将您的数据填充到您的列表中，如下所示： 

   public class MyActivity extends Activity { 

  private ExpandableListView forumListView;
  private ForumListAdapter forumListAdapter;
  String[] forumList={"group 1","group 2","group 3"};
 String[][] subForumList={{"group 1 child1","group 1 child1","group 1 child3"},
                     {"group 2 child1","group 2 child2","group 2 child3"},
                     {"group 3 child1","group 3 child2","group 3 child3"},
                     };
     @Override
     public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.main);


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




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



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

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

    public class ForumListAdapter extends BaseExpandableListAdapter {

      String[] groups;
   String[][] children;
     private Context ctx;

   public ForumListAdapter(Context ctx, String[] groups, String[][] children) {
    this.ctx = ctx;
    this.groups = groups;
    this.children = children;
}

public Object getChild(int arg0, int arg1) {
    // TODO Auto-generated method stub
    return children[arg0][arg1];
}

public long getChildId(int arg0, int arg1) {
    // TODO Auto-generated method stub
    return arg1;
}

public View getChildView(int arg0, int arg1, boolean arg2, View arg3,
        ViewGroup arg4) {
    if (arg3 == null) {
        LayoutInflater inflater = LayoutInflater.from(ctx);
        arg3 = inflater.inflate(R.layout.child, null);
    }

    String childData = children[arg0][arg1];
    TextView name = (TextView)arg3.findViewById(R.id.child_row_forum_title);
    TextView desc = (TextView)arg3.findViewById(R.id.child_row_forum_description);

    if (name != null)
        name.setText(childData);

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

    arg3.setFocusableInTouchMode(true);
    return arg3;}

public int getChildrenCount(int arg0) {
    // TODO Auto-generated method stub
    return children[arg0].length;
}

public Object getGroup(int arg0) {
    // TODO Auto-generated method stub
    return groups[arg0];
}

public int getGroupCount() {
    // TODO Auto-generated method stub
    return groups.length;
}

public long getGroupId(int arg0) {
    // TODO Auto-generated method stub
    return arg0;
}

public View getGroupView(int arg0, boolean arg1, View arg2, ViewGroup arg3) {
    if (arg2 == null)
    {
        LayoutInflater inflater = LayoutInflater.from(ctx);
        arg2 = inflater.inflate(R.layout.group, null);
    }


    TextView name = (TextView) arg2.findViewById(R.id.group_item_forum_title);
    //ImageView image = (ImageView) arg2.findViewById(R.id.group_item_expander_image);

    if(name != null)
        name.setText(groups[arg0]);           

    /*
    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 arg2;}

public boolean hasStableIds() {
    // TODO Auto-generated method stub
    return false;
}

public boolean isChildSelectable(int arg0, int arg1) {
    // TODO Auto-generated method stub
    return false;
}
    }

       }
于 2012-06-13T07:02:00.060 回答
0

添加implements OnGroupExpandListener到您的活动中。然后它将起作用。我正在使用它，它工作正常。

于 2012-06-13T06:24:12.013 回答
0

就我而言，我在组视图和子视图中有按钮，甚至在这两个视图android:focusable="false" android:focusableInTouchMode="false"上都设置了它不起作用。

所以我不得不将它们从 更改ImageButton为ImageView。点击的监听器是相同的。您可能需要创建自定义背景来为ImageView.

于 2020-02-19T17:43:03.933 回答