Why does @PropertyName fail to automatically serialize maps, while it successfully serializes other-CodePudding

ScreenModel.java

public class ScreenModel {

    @PropertyName("TEST_FIELD")
    private HashMap<String, Object> testFieldHashMap;

    public HashMap<String, Object> getTestFieldHashMap() {
        return testFieldHashMap;
    }

}

addSnapshotListener

FirebaseFirestore.getInstance().collection("SCREENS").document(sharedPreferences.getString("documentId", null)).addSnapshotListener((value, error) - > {
if (error != null) return;
    
if (value != null && value.exists()) {
    ScreenModel screenModel = value.toObject(ScreenModel.class);
    if (screenModel.getTestFieldHashMap() == null)
        Log.w("ABC", "111"); // It always print this, why always null?
}});

Why does @PropertyName fail to automatically serialize maps, while it successfully serializes other types?

CodePudding user response：

Isn't about the type of the field, but about the access modifier. You set the field to be private. To solve this, it's necessary to set the field public:

@PropertyName("TEST_FIELD")
public HashMap<String, Object> testFieldHashMap;
//