Question

当用户下订单时，会在firebase上自动创建表请求，并在该表中包含名称，电话号码，地址。现在在另一个活动中，我想查看已下达的订单，并希望在回收站视图中检索数据，但应用程序显示空白屏幕。这是我的java代码。

public class OrderStatus extends AppCompatActivity {

public RecyclerView recyclerView;
public RecyclerView.LayoutManager layoutManager;

FirebaseRecyclerAdapter<Request,OrderViewHolder> adapter;
FirebaseDatabase database;
DatabaseReference requests;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_order_status);
    //firebase
    database=FirebaseDatabase.getInstance();
    requests=database.getReference("Requests");

    recyclerView= (RecyclerView)findViewById(R.id.listOrders);
    recyclerView.setHasFixedSize(true);
    layoutManager= new LinearLayoutManager(this);
    recyclerView.setLayoutManager(layoutManager);

    loadOrders();


}

private void loadOrders() {


    adapter = new FirebaseRecyclerAdapter<Request, OrderViewHolder>(
            Request.class,
            R.layout.order_layout,
            OrderViewHolder.class,
            requests.orderByChild("phone")
            .equalTo("phone")
    ) {



        @Override
        protected void populateViewHolder(OrderViewHolder viewHolder, Request model, int position) {
            viewHolder.txtOrderId.setText(adapter.getRef(position).getKey());
            viewHolder.txtOrderStatus.setText(convertCodeToStatus(model.getStatus()));
            viewHolder.txtOrderAddress.setText(model.getAddress());
            viewHolder.txtOrderPhone.setText(model.getPhone());

        }
    };
    recyclerView.setAdapter(adapter);
}

private String convertCodeToStatus(String status) {
    if (status.equals("0"))
        return "placed";
    else if (status.equals("1"))
        return "On my way";
    else
        return "Shipped";
}

}

Answer 1

您没有在方法加载订单中传递参数，因此您尝试这样做对我有用 private void loadOrders（）{

adapter = new FirebaseRecyclerAdapter<Request, OrderViewHolder>(
        Request.class,
        R.layout.order_layout,
        OrderViewHolder.class,
        requests.orderByChild("phone")

)

应用程序未从Firebase数据库检索数据显示空白屏幕

1 个答案: