How to add Three Level ListView in ExpandableListView in android

Question

I want to add one more level of in ExpandableListView.In current ExpandableListView is two level how can i add one more level. I am new in android developing please help me.

Answer 1

activity_main.xml

MainActivity.Java

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ListView;

import android.widget.TextView;

import android.widget.LinearLayout.LayoutParams;


public class Home extends Activity 
{

ExpandableListView explvlist;  
@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    explvlist = (ExpandableListView)findViewById(R.id.ParentLevel);
    explvlist.setAdapter(new ParentLevel());

}

public class ParentLevel extends BaseExpandableListAdapter
{

      @Override
      public Object getChild(int arg0, int arg1) 
      {   
       return arg1;
      }

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

      @Override
      public View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent) 
      {
       CustExpListview SecondLevelexplv = new CustExpListview(Home.this);
       SecondLevelexplv.setAdapter(new SecondLevelAdapter());
       SecondLevelexplv.setGroupIndicator(null);   
       return SecondLevelexplv;
      }

      @Override
      public int getChildrenCount(int groupPosition) 
      {   
       return 3;
      }

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

      @Override
      public int getGroupCount() 
      {   
       return 5;
      }

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

      @Override
      public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) 
      {
       TextView tv = new TextView(Home.this);
       tv.setText("->FirstLevel");
       tv.setBackgroundColor(Color.BLUE);
       tv.setPadding(10, 7, 7, 7); 

       return tv;
      }

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

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

public class CustExpListview extends ExpandableListView
{

    int intGroupPosition, intChildPosition, intGroupid;

      public CustExpListview(Context context) 
      {
       super(context);     
      }

      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
      {
       widthMeasureSpec = MeasureSpec.makeMeasureSpec(960, MeasureSpec.AT_MOST);
       heightMeasureSpec = MeasureSpec.makeMeasureSpec(600, MeasureSpec.AT_MOST);
       super.onMeasure(widthMeasureSpec, heightMeasureSpec);
      }  
}

public class SecondLevelAdapter extends BaseExpandableListAdapter
{

  @Override
  public Object getChild(int groupPosition, int childPosition) 
  {   
    return 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) 
  {
    TextView tv = new TextView(Home.this);
    tv.setText("child");
    tv.setPadding(15, 5, 5, 5);
    tv.setBackgroundColor(Color.YELLOW);
    tv.setLayoutParams(new ListView.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
    return tv;
  }

  @Override
  public int getChildrenCount(int groupPosition) 
  {
    return 5;
  }

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

  @Override
  public int getGroupCount() 
  {
    return 1;
  }

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

  @Override
  public View getGroupView(int groupPosition, boolean isExpanded,View convertView, ViewGroup parent) 
  {
       TextView tv = new TextView(Home.this);
       tv.setText("-->Second Level");
       tv.setPadding(12, 7, 7, 7);
       tv.setBackgroundColor(Color.RED);       
       return tv;
  }

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

@Override
public boolean isChildSelectable(int groupPosition, int childPosition)
{
    // TODO Auto-generated method stub
    return true;
}

}
}