java - How to Implement a Multi-Level ExpandableListView with Hierarchy: Plant → Department & Section → Line → Devices i

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I am working on an Android project where I need to implement a hierarchical structure using an ExpandableListView. Currently, I have implemented a two-level hierarchy: Plant → Devices. Now, I want to expand this hierarchy to include additional levels as follows:" Plant → Department-Section → Line → Devices

I want to extend my current hierarchy to support four levels: Plant → Department-Section → Line → Devices. Here's how the hierarchy should look

Plant1
   └── Department1-Section1
       ├── Line1
       │   ├── Device1
       │   └── Device2
       └── Line2
           ├── Device3
           └── Device4
   └── Department2-Section2
       ├── Line3
           ├── Device5
           └── Device6

I am not sure how to structure the data and create a custom adapter that can handle this four-level hierarchy. Since ExpandableListView natively supports only two levels (Group and Child),

I need guidance on how to:

• Design a data structure to represent this hierarchy.
• Implement a custom adapter to render this hierarchy in the ExpandableListView.
• Handle nested levels like Department-Section and Line within the same framework.

I have considered using multiple ExpandableListViews or embedding a RecyclerView inside the child view for additional levels, but I'm unsure about the best approach for performance and scalability. I have not yet been able to integrate the three additional levels (Department-Section, Line, and Device)

I am working on an Android project where I need to implement a hierarchical structure using an ExpandableListView. Currently, I have implemented a two-level hierarchy: Plant → Devices. Now, I want to expand this hierarchy to include additional levels as follows:" Plant → Department-Section → Line → Devices

I want to extend my current hierarchy to support four levels: Plant → Department-Section → Line → Devices. Here's how the hierarchy should look

Plant1
   └── Department1-Section1
       ├── Line1
       │   ├── Device1
       │   └── Device2
       └── Line2
           ├── Device3
           └── Device4
   └── Department2-Section2
       ├── Line3
           ├── Device5
           └── Device6

I am not sure how to structure the data and create a custom adapter that can handle this four-level hierarchy. Since ExpandableListView natively supports only two levels (Group and Child),

I need guidance on how to:

• Design a data structure to represent this hierarchy.
• Implement a custom adapter to render this hierarchy in the ExpandableListView.
• Handle nested levels like Department-Section and Line within the same framework.

I have considered using multiple ExpandableListViews or embedding a RecyclerView inside the child view for additional levels, but I'm unsure about the best approach for performance and scalability. I have not yet been able to integrate the three additional levels (Department-Section, Line, and Device)

• java
• android
• xml
• mobile
• expandablelistview

Share Improve this question Follow edited Nov 25, 2024 at 7:22 Karan Satpute asked Nov 22, 2024 at 4:49 Karan SatputeKaran Satpute 1 1

• stackoverflow.com/questions/18765638/… – i_A_mok Commented Nov 29, 2024 at 7:54

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1 Answer 1

Sorted by: Reset to default -1

Data Structure:

To represent the four-level hierarchy,we can use a recursive data structure like a custom class

public class HierarchicalItem {
   private String title;
   private boolean isExpanded;
   private  List<HierarchicalItem> children;

    public HierarchicalItem(String title){
     this .title=title;
     this.isExpanded = false;
     this.children =new Arraylist<>(); 

  }
  //getter ,setter 
 }

Additional point: Populate the rootItems list witj your Hierarchical data.

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