Why Isn't My Firebase Data Showing in My Android ListView After Login?

Troubleshooting Firebase Android ListView Display Issues

Problem: Firebase data is not being displayed on the ListView in the main menu screen after user login.

Code Walkthrough:

public void makeItem ()
{
    lv = findViewById(R.id.listView);
    db = FirebaseDatabase.getInstance().getReference();
    helper = new FirebaseHelper(db);
    adapter= new AdapterItem(this,helper.retrive());
    lv.setAdapter(adapter);
}

public AdapterItem(Context c, ArrayList<CustomListAdapter> customListAdapters) {
    this.c = c;
    this.customListAdapters = customListAdapters;
}

private String ItemName; // Field in CustomListAdapter class

ItemName.setText(CLA.getItemName()); // Getter in AdapterItem class

Issue:

The getter function in the AdapterItem class is named getItemName() with a capital 'I'. Firebase, however, expects the field name to be itemName with a lowercase 'i' in the CustomListAdapter class.

Solutions:

Solution 1: Rename Model Class Fields

Update the CustomListAdapter class to follow Java Naming Conventions:

public class CustomListAdapter {
    private String itemName, quantity, serialNo, supplierName, supplierEmail, supplierPhone;
}

Solution 2: Use Annotations

Keep the CustomListAdapter class as it is and use @PropertyName annotations in front of the getters:

@PropertyName("ItemName")
public String getItemName() { return ItemName; }

Additional Considerations:

Ensure that the data in the Firebase database is correct and formatted as expected.

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