小编Jus*_*tor的帖子

我想获取父键值，其中“drinkManufacturerID”等于 currentUsers UID。但是，我不知道 theVenueID或 the的值PushID（见下文）。在不知道这些值的情况下，如何检查“drinkManufacturerID”的值是否相等。是否可以不重组我的数据库？

相关代码：

public class DealRawDataActivity extends AppCompatActivity {


DatabaseReference databaseDrinks;
DatabaseReference databaseManufacturer;


String keys;

FirebaseUser currentFirebaseUser = FirebaseAuth.getInstance().getCurrentUser();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_deal_raw_data);


    databaseDrinks = FirebaseDatabase.getInstance().getReference("drinks").child("-LWLuM2nesg0uaP0dLSn"); //However, this string will not be know! How to get this string value?

    //To later be used in listView
    databaseDrinks.orderByChild("drinkManufacturerID").equalTo(currentFirebaseUser.getUid()).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            for (DataSnapshot datas : dataSnapshot.getChildren()) {
                keys = datas.getKey();
            }
            Toast.makeText(getApplicationContext(), keys, Toast.LENGTH_LONG).show(); …