Expandable ListView OnClick

Question

I have got MainActivity.java, SecondActivity.java and MyExpandableAdapter.java for my ExpandableListView. I am trying to on my child item click go to the SecondActivity. But I really dont know how to do that. I have tryed to add startActivity(new Intent(this(), SecondActivity.class)); to my OnClickListener in my MyExpandableAdapter.java but it does not work. Please help me :)

Here is my code.

MainActivity.java

public class MainActivity extends ExpandableListActivity{
    private ArrayList<String> parentItems = new ArrayList<String>();
    private ArrayList<Object> childItems = new ArrayList<Object>();
    @Override
    public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);    
     ExpandableListView expandableList = getExpandableListView();
     expandableList.setDividerHeight(2);
     expandableList.setGroupIndicator(null);
     expandableList.setClickable(true);
     setGroupParents();
     setChildData();
     MyExpandableAdapter adapter = new MyExpandableAdapter(parentItems, childItems);

        adapter.setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
        expandableList.setAdapter(adapter);
        expandableList.setOnChildClickListener(this);
    }

    public void setGroupParents() {
        parentItems.add("Android");
        parentItems.add("Core Java");
        parentItems.add("Desktop Java");
        parentItems.add("Enterprise Java");
    }

    public void setChildData() {

        // Android
        ArrayList<String> child = new ArrayList<String>();
        child.add("Core");
        child.add("Games");
        childItems.add(child);


        // Core Java
        child = new ArrayList<String>();
        child.add("Apache");
        child.add("Applet");
        child.add("AspectJ");
        child.add("Beans");
        child.add("Crypto");
        childItems.add(child);

        // Desktop Java
        child = new ArrayList<String>();
        child.add("Accessibility");
        child.add("AWT");
        child.add("ImageIO");
        child.add("Print");
        childItems.add(child);


        // Enterprise Java
        child = new ArrayList<String>();
        child.add("EJB3");
        child.add("GWT");
        child.add("Hibernate");
        child.add("JSP");
        childItems.add(child);
    }

} 

MyExpandableAdapter.java(you can see in my public void OnClick toast message, it works but as I said, I want to go to the SecondActivity, onChildItemClick)

public class MyExpandableAdapter extends BaseExpandableListAdapter {

    private Activity activity;
    private ArrayList<Object> childtems;
    private LayoutInflater inflater;
    private ArrayList<String> parentItems, child;


    public MyExpandableAdapter(ArrayList<String> parents, ArrayList<Object> childern) {
        this.parentItems = parents;
        this.childtems = childern;
    }

    public void setInflater(LayoutInflater inflater, Activity activity) {
        this.inflater = inflater;
        this.activity = activity;
    }


    @Override
    public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

        child = (ArrayList<String>) childtems.get(groupPosition);

        TextView textView = null;

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

        textView = (TextView) convertView.findViewById(R.id.textView1);
        textView.setText(child.get(childPosition));

        convertView.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View view) {
                Toast.makeText(activity, child.get(childPosition),
                        Toast.LENGTH_SHORT).show();
            }
        });

        return convertView;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

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

        ((CheckedTextView) convertView).setText(parentItems.get(groupPosition));
        ((CheckedTextView) convertView).setChecked(isExpanded);

        return convertView;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return null;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return 0;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return ((ArrayList<String>) childtems.get(groupPosition)).size();
    }

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

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

    @Override
    public void onGroupCollapsed(int groupPosition) {
        super.onGroupCollapsed(groupPosition);
    }

    @Override
    public void onGroupExpanded(int groupPosition) {
        super.onGroupExpanded(groupPosition);
    }

    @Override
    public long getGroupId(int groupPosition) {
        return 0;
    }



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

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

}

My SecondActivity is empty :)

I appreciate every answer, thank you!

Answer 1

Change

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

to

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