檢索特定的鍵下的Uid和使用查詢火力的Android

我試圖讓使用特定node.The特定節點的關鍵價值是當前登錄用戶一個火力地堡查詢。檢索特定的鍵下的Uid和使用查詢火力的Android

如何獲取特定鍵值下的用戶的節點當前登錄並使用它來查詢我的數據庫？

這是我的代碼：

final String user_id = firebaseAuth.getCurrentUser().getUid(); 

    databaseReference.addValueEventListener(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot){ 
      halls1 = (String) dataSnapshot.child("Male").child(user_id).getValue(User.class).getHalls(); 
      halls2 = (String) dataSnapshot.child("Female").child(user_id).getValue(User.class).getHalls(); 
     } 
     @Override 
     public void onCancelled(DatabaseError databaseError){ 

     } 
    }); 


    databaseReference.addValueEventListener(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 
      if(dataSnapshot.child("Male").hasChild(user_id)){ 
       query = databaseReference.child("Female").orderByChild("halls").equalTo(halls1); 

      } 
      else{ 
       query = databaseReference.child("Female").orderByChild("halls").equalTo(halls2); 
      } 
     } 
     @Override 
     public void onCancelled(DatabaseError databaseError){ 

     } 
    });

數據庫結構

{ 
    "Users" : { 
    "Female" : { 
     "WwBjblOo8maSP5PXlYviONrS3Oo2" : { 
     "downloadUrl" : "https://firebasestorage.googleapis.com/v0/b/loginapp-8088d.appspot.com/o/userProfiles%2Fecf2758a-5628-4297-bcb3-e8c3f138cbbd.jpeg?alt=media&token=1ca6067d-6c08-49b9-a2bf-6a8315ada067", 
     "halls" : "Kwapong", 
     "levels" : "300", 
     "username" : "merylstre" 
     }, 
     "X8c80zaY0kfT5KVoTFHbhPIEG9z2" : { 
     "downloadUrl" : "https://firebasestorage.googleapis.com/v0/b/loginapp-8088d.appspot.com/o/userProfiles%2F51dc26a1-45e8-4897-9c2f-14caf8e79cc5.jpeg?alt=media&token=90818c1e-167e-4799-bc29-b3fe52529cd2", 
     "halls" : "Sarbah", 
     "levels" : "100", 
     "username" : "hashcodef" 
     } 
    }, 
    "Male" : { 
     "2EXejmHoMlWoKSDb5APvSt8do5e2" : { 
     "downloadUrl" : "https://firebasestorage.googleapis.com/v0/b/loginapp-8088d.appspot.com/o/userProfiles%2F83ca18a0-63a5-477a-ab1e-b2732b3ebfa1.jpeg?alt=media&token=b8626221-a67c-48e3-b958-d373c9f63c69", 
     "halls" : "Sarbah", 
     "levels" : "100", 
     "username" : "fillman" 
     }, 
     "BW79oGosAIhdxDxYXbtHbSbC0D23" : { 
     "downloadUrl" : "https://firebasestorage.googleapis.com/v0/b/loginapp-8088d.appspot.com/o/userProfiles%2F90b93b19-230b-4f28-b394-358d0c516c5c.jpeg?alt=media&token=0c82c272-d6fb-46e8-a6cf-581f5501de7b", 
     "halls" : "Sarbah", 
     "levels" : "100", 
     "username" : "radjames" 
     }, 
     "Mop4hbS0zne6QS3woum1udLgwqf1" : { 
     "downloadUrl" : "https://firebasestorage.googleapis.com/v0/b/loginapp-8088d.appspot.com/o/userProfiles%2F78621a8b-7d67-413c-9e57-f378e60ba41e.jpeg?alt=media&token=3982ee0a-2a34-41b3-9250-f0884531ee86", 
     "halls" : "Sarbah", 
     "levels" : "100", 
     "username" : "radjohn" 
     }, 
     "VvnOY3k7Cwa36bJW55JiZDJRwPN2" : { 
     "downloadUrl" : "https://firebasestorage.googleapis.com/v0/b/loginapp-8088d.appspot.com/o/userProfiles%2F1ac7080f-8db8-49a7-bb76-34b007deb839.jpeg?alt=media&token=6d100527-80d3-49b3-b0ae-617dd55e64de", 
     "halls" : "Sarbah", 
     "levels" : "100", 
     "username" : "ciryadams" 
     }, 
     "WOT11DVkoVb9owzK4qKHbvT4ODF2" : { 
     "downloadUrl" : "https://firebasestorage.googleapis.com/v0/b/loginapp-8088d.appspot.com/o/userProfiles%2F3fda02ae-c577-4a4a-86c1-cadcaf518c97.jpeg?alt=media&token=5baf2a79-b14c-4e28-b7bb-77e55ae08e55", 
     "halls" : "Sarbah", 
     "levels" : "100", 
     "username" : "markzuck" 
     }, 
     "dbnmFoC4hnSCsXsxJgVO0Q7GYx13" : { 
     "downloadUrl" : "https://firebasestorage.googleapis.com/v0/b/loginapp-8088d.appspot.com/o/userProfiles%2F2366c787-fb16-4049-9c7d-3d0c2a09ab9b.jpeg?alt=media&token=25bda8dd-ab24-4b9b-8299-534e49bf9ed4", 
     "halls" : "Sarbah", 
     "levels" : "100", 
     "username" : "dasdsada" 
     }, 
     "iqZfSgGNpPZ4HDtOUuHYZ1u8x273" : { 
     "downloadUrl" : "https://firebasestorage.googleapis.com/v0/b/loginapp-8088d.appspot.com/o/userProfiles%2Fc52cd467-05b9-4ece-8085-4cdf502839c5.jpeg?alt=media&token=4c9eb36e-4644-49ec-85eb-c2fef38ca50e", 
     "halls" : "Sarbah", 
     "levels" : "100", 
     "username" : "maameEsi" 
     }, 
     "jj9yycmDNbZwiPVTLrRyYZheM702" : { 
     "downloadUrl" : "https://firebasestorage.googleapis.com/v0/b/loginapp-8088d.appspot.com/o/userProfiles%2F5c4a34b2-bc7b-43e7-8b00-7e0bf63ff252.jpeg?alt=media&token=59a11905-a67d-48ea-9f16-10ffd3915876", 
     "halls" : "Sarbah", 
     "levels" : "100", 
     "username" : "hashcode" 
     } 
    } 
    } 
}

來源

2017-02-16 Philip Mintah

火力地堡認證用戶不自動存儲在Firebase數據庫中。如果它們存儲在數據庫中，那麼您已經編寫了代碼來執行此操作。如果是這種情況，請分享顯示用戶存儲方式的JSON代表片段（如文本，沒有截圖）。您可以通過點擊[Firebase數據庫控制檯]（https://console.firebase.google.com/project/_/database/data/）中的導出JSON鏈接來獲取此JSON。 –

我剛剛共享的JSON @FrankvanPuffelen –

的片斷，你怎麼知道基於'firebaseAuth.getCurrentUser（）'根據該節點（'Female'或'Male'）的用戶存儲？如果你不知道沒有查看數據庫，你將永遠不得不在兩個節點下進行檢查。 –

要閱讀的情況下，用戶他們是Male節點下：

final String user_id = firebaseAuth.getCurrentUser().getUid(); 
final DatabaseReference root = FirebaseDatabase.getInstance().getReference(); 
DatabaseReference userRef = root.child("Male").child(user_id); 

userRef.addValueEventListener(new ValueEventListener() { 
    @Override 
    public void onDataChange(DataSnapshot dataSnapshot){ 
     if (snapshot.exists()) { 
      halls1 = (String) snapshot.getValue(User.class).getHalls(); 
     } 
     else { 
      System.out.println("User "+user_id+" does not exist under /Male"); 
     } 

    } 
    @Override 
    public void onCancelled(DatabaseError databaseError){ 

    } 
});

來源

2017-02-16 16:08:23

檢索特定的鍵下的Uid和使用查詢火力的Android

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