CODEWITHSUNDEEP
javaandroidexpandablelistviewexpandablelistadapter
user1411823
user1411823

Reputation: 25

Getting nullpointerexception onChildClick

Trying to get text value of child in expandableListView.

Getting a nullpointerexception in the onchildclick event. 

 E/AndroidRuntime(358): at tournament.tracker.pkg.ExpList$5.onChildClick(ExpList.java:124)

Line 124 is the adapter.getChild line.

I'm trying to pass the string value of the child that is clicked to another activity.

expList.setOnChildClickListener(new OnChildClickListener()
  {

    @Override
    public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
        ExpandableListAdapter adapter = getExpandableListAdapter();
        gametype = adapter.getChild(groupPosition, childPosition).toString();
        //---------------------
        Intent pullt = new Intent(ExpList.this, JsonActivity.class);
        Bundle bundle = new Bundle();
        bundle.putString("gametype", gametype);
        pullt.putExtras(bundle);
        pullt.putExtra("gametype", gametype);

        startActivity(pullt);
        //---------------------
        return false;
    }

  });

Anyone know why this is not working? Please help if possible

EDIT

Here's the adapter:

public class ExpAdapter extends BaseExpandableListAdapter {

      private Context myContext;
      public ExpAdapter(Context context) {
       myContext = context;
      }

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

      // Other code - not relevant
     }

Upvotes: 0

Views: 259

Answers (1)

Sam
Sam

Reputation: 86958

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

This function will always return null. Trying to access null in any way (like using toString()) will create a Null Pointer Exception, you must implement this function to return actual data.

A fix may possibly be: 

public Object getChild(int groupPosition, int childPosition) {
    return ExpList.arrChildelements[groupPosition][childPosition];;
}

Upvotes: 3

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