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

Firebase Android ListView Not Being Displayed

The issue you encounter while attempting to display data from the Firebase real-time database in a ListView stems from a naming inconsistency between your model class and the database fields.

Firebase Database Field Names

In your provided database image, the fields are named using lowercase letters, such as "itemName" and "quantity."

Model Class Field Names

However, in your CustomListAdapter class, you have fields named using uppercase letters, such as "ItemName" and "Quantity."

Resolving the Naming Issue

To resolve this mismatch, you have two options:

1. Rename Model Class Fields (Recommended)

Rename the fields in your CustomListAdapter class to match the lowercase names used in the database, as shown below:

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

2. Use PropertyName Annotation (Less Recommended)

Alternatively, you can keep the uppercase names in your model class but use the @PropertyName annotation in front of the getters. This annotation instructs Firebase to map the uppercase names to the lowercase database field names:

public class CustomListAdapter {
    private String ItemName;
    private String Quantity;

    @PropertyName("itemName")
    public String getItemName() { return ItemName; }
    @PropertyName("quantity")
    public String getQuantity() { return Quantity; }
}

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