如何在Android

Question

我想在列表视图中从Firebase检索嵌套数据，但输出不正确。输出为“ com.example.packagename”。我想在给定位置检索customerName，日期和productName。我还附加了用户模型类。根据我的想法，setkey（）方法检索第一个密钥，当前注册用户将其下达的命令与其UID相对，并且内部密钥是从firebase pushkey（）方法获得的。

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sales_report);

        listView = (ListView)findViewById(R.id.listview);

        final ArrayAdapter adapter = new ArrayAdapter<UserModel>(this,R.layout.support_simple_spinner_dropdown_item, arrayList);
        listView.setAdapter(adapter);

        database = FirebaseDatabase.getInstance();
        MyRef = database.getReference("placedOrders");

        MyRef.addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                UserModel userModel = new UserModel();
                for (DataSnapshot dsp : dataSnapshot.getChildren()){

                    userModel = dsp.getValue(UserModel.class);
                    userModel.setKey(dsp.getKey());

                    arrayList.add(userModel);
                }

                adapter.notifyDataSetChanged();

            }

这是我的用户模型类。

public class UserModel {

    private String customerName;
    private String productName;
    private Double latitude;
    private Double longitude;
    private Date date;
    private String key;

    public UserModel(){

    }

    public String getKey() {
        return key;
    }

    public void setKey(String key) {
        this.key = key;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        date = date;
    }

    public Double getLatitude() {
        return latitude;
    }

    public void setLatitude(Double latitude) {
        latitude = latitude;
    }

    public Double getLongitude() {
        return longitude;
    }

    public void setLongitude(Double longitude) {
        longitude = longitude;
    }

    public String getCustomerName() {
        return customerName;
    }

    public void setCustomerName(String customerName) {
        customerName = customerName;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        productName = productName;
    }

}