我有一个Android应用程序，厨师可以在其中查看客户订单列表。每个订单都有自己的按钮，单击该按钮可以更新该订单在数据库中的可见性。这段代码行之有效。
但是，单击按钮后，我希望主厨的视图自动更新以使订单不再显示在屏幕上。目前，他们必须返回并重新加载屏幕才能消失。有没有人有什么建议？我已经考虑过重新加载活动，但是由于清除按钮的功能在适配器类中，而不是在厨师活动中，所以这是行不通的。
这是厨师班：
public class ChefScreen extends AppCompatActivity {
ListView listView;
List<ChefOrderList> listOrders;
Button requestWaiter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chef_screen);
listView = findViewById(R.id.list_chef_orders);
listOrders = new ArrayList<>();
requestWaiter = findViewById(R.id.btnChefToWaiter);
requestWaiter.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
getWaiter();
}
});
displayOrders();
}
private void displayOrders(){
String url = "hidden";
StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject obj = new JSONObject(response);
JSONArray array = obj.getJSONArray("orders");
for (int i = 0; i < array.length(); i++) {
final JSONObject orderObj = array.getJSONObject(i);
ChefOrderList c = new ChefOrderList(orderObj.getString("menu_item_name"), orderObj.getString("item_type"), orderObj.getString("order_date_time"),
orderObj.getInt("quantity_ordered"), orderObj.getInt("order_id"), orderObj.getInt("table_id"));
listOrders.add(c);
}
ChefOrderAdapter adapter = new ChefOrderAdapter(listOrders, getApplicationContext());
listView.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(ChefScreen.this, "Oops!" +error.toString(), Toast.LENGTH_LONG).show();
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("menuid", "0");
return params;
}
};
MySingleton.getInstance(this).addToRequestQueue(stringRequest);
}
}
Model类：
public class ChefOrderList {
String Name, Type, Date;
int Qty, Order, Table;
public ChefOrderList(String name, String type, String date, int qty, int order, int table) {
Name = name;
Type = type;
Date = date;
Qty = qty;
Order = order;
Table = table;
}
public String getDate() {
return Date;
}
public String getName() {
return Name;
}
public String getType() {
return Type;
}
public int getQty() {
return Qty;
}
public int getOrder() {
return Order;
}
public int getTable() {
return Table;
}
}
最后是适配器！ completeOrder方法是单击清除订单按钮后执行的方法。
public class ChefOrderAdapter extends ArrayAdapter<ChefOrderList> {
private List<ChefOrderList> chefOrderList1;
private Context context;
private Button completeOrder;
public ChefOrderAdapter(List<ChefOrderList> M, Context C){
super(C, R.layout.listcheforders, M);
this.chefOrderList1 = M;
this.context = C;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater layoutInflater = LayoutInflater.from(context);
View view = layoutInflater.inflate(R.layout.listcheforders,null,true);
TextView orderNumber = view.findViewById(R.id.tvOrderNumber);
TextView itemType = view.findViewById(R.id.tvItemType);
TextView itemName = view.findViewById(R.id.tvItemName);
TextView orderQuantity = view.findViewById(R.id.tvItemQty);
TextView orderTime = view.findViewById(R.id.tvDateTime);
TextView table = view.findViewById(R.id.tvTable);
completeOrder = view.findViewById(R.id.btnComplete);
ChefOrderList chefOrderList = chefOrderList1.get(position);
itemName.setText(chefOrderList.getName());
orderQuantity.setText("Qty: " +chefOrderList.getQty());
if(position>0){
ChefOrderList prevChefOrderList = chefOrderList1.get(position-1);
if(chefOrderList.getOrder() != (prevChefOrderList.getOrder())){
orderNumber.setText("Order: " +chefOrderList.getOrder());
orderTime.setText(chefOrderList.getDate());
table.setText("Table: " +chefOrderList.getTable());
completeOrder.setVisibility(View.VISIBLE);
completeOrder.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
completeOrder(position);
}
});
}
if(!chefOrderList.getType().equals(prevChefOrderList.getType())){
itemType.setText(chefOrderList.getType());
}
} else {
itemType.setText(chefOrderList.getType());
orderNumber.setText("Order: " +chefOrderList.getOrder());
orderTime.setText(chefOrderList.getDate());
table.setText("Table: " +chefOrderList.getTable());
completeOrder.setVisibility(View.VISIBLE);
completeOrder.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
completeOrder(position);
}
});
}
return view;
}
private void completeOrder(final int position){
String url = "hidden";
StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if(response.trim().equals("success")){
Toast.makeText(context, "Order completed!", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(context, "Clear order failed!", Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(context, "Error!" +error.toString(), Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("orderid", String.valueOf(chefOrderList1.get(position).getOrder()));
return params;
}
};
MySingleton.getInstance(context).addToRequestQueue(stringRequest);
}
}
答案 0 :(得分：1)
据此行了解
如果厨师的视图自动更新，以便 订单不再显示在他们的屏幕上。
基于客户操作的数据库更新；例如关闭订单或取消订单。对吧？
我认为您应该使用Socket或Push Notification。
随行推送通知“ FCM”
当客户执行影响数据库中订单的操作时，您应使用其令牌向厨师发送通知，并在应用程序中处理该通知以撤回
displayOrders方法
并使用recyclerview.notifiDataSetChange();
否则，您应该重新连接到数据库以检查是否发生任何更改。 “不推荐”