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I have saved date as the key. Now I want to retrieve the dates to the list view. I am aware of how to retrieve the child value to the listview but not sure how to do the same for key values. Below is the code i am using: 

databaseReference = FirebaseDatabase.getInstance().getReference().child(savedCollname).
child("Students").child(userId).child("Lectures").child(post_key);

FirebaseListOptions<String> options = new FirebaseListOptions.Builder<String>()
.setLayout(R.layout.subject_list_heading)

.setQuery(databaseReference, String.class)
.build();

adapter = new FirebaseListAdapter<String>(options) {


@Override
protected void populateView(View v, String model, int position) {

TextView subject_name = v.findViewById(R.id.tv_sub_heading);
subject_name.setText(model);



}
};

list_of_date.setAdapter(adapter);

My app crashes with the error: Failed to convert value of type java.util.Hashmap to String

JSON object of database:

{
  "-LHSdSCzD_tZhzqvSOw_" : {
    "17-7-2018" : {
      "Absent" : "0",
      "Present" : "1",
      "Total_Lectures" : "1"
    },
      "18-7-2018" : {
      "Absent" : "0",
      "Present" : "1",
      "Total_Lectures" : "1"
    }
}

I want to retrieve the dates ie the node to the listview. If there is any other way please do mention. Any help is appreciated.

yaha kaha
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1 Answers1

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@Override
protected void populateView(View v, String model, int position) {
    adapter.getRef(position).getKey();
    //Use this method to get the key.

}
Raj
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