完善PayOfflineViewModel注释

app/src/main/java/com/bgycc/smartcanteen/viewModel/PayOfflineViewModel.java

@@ -133,6 +133,8 @@ public class PayOfflineViewModel extends ViewModel {
         }
     };
 
+    // 当支付时websocket未链接，则走离线支付流程
+    // 此时直接标记订单为"离线支付"状态
     private class MarkRunnable implements Runnable {
         private PayData payData;
 
@@ -207,6 +209,7 @@ public class PayOfflineViewModel extends ViewModel {
                 return;
             }
 
+            // 保存服务器返回的结果
             PayResponse payResponse = gson.fromJson(response, PayResponse.class);
             payOfflineState.postValue(new PayOfflineState(PayOfflineState.SUCCESS, payResponse.getMessage()));
             long lastInsertId = payResponseRepository.insertPayResponse(payResponse);
@@ -215,7 +218,7 @@ public class PayOfflineViewModel extends ViewModel {
             }
 
             List<PayData> dataList = payRequest.getData();
-            // 设置所有离线支付订单状态为支付成功
+            // 设置离线支付订单状态为支付成功
             // 同时在日志中记录所有订单的payCode
             StringBuilder ids = new StringBuilder();
             for (PayData data : dataList) {
@@ -238,6 +241,7 @@ public class PayOfflineViewModel extends ViewModel {
         }
     }
 
+    // 离线订单发送到后台超时后，重置其标志位保存到数据库
     private class TimeoutRunnable implements Runnable {
         @Override
         public void run() {