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[英]How to Fetch child nodes without using unique ids using Query from Firebase database in Android Studio?
[英]How to query from a parameter in child nodes in firebase database for android?
要解决此问题,请使用以下代码行:
DatabaseReference mDatabaseReference = FirebaseDatabase.getInstance().getReference().child("semester").child("0").child("subjects").child("0");
mDatabaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
boolean guestType = dataSnapshot.child("BCT").getValue(Boolean.class);
}
@Override
public void onCancelled(DatabaseError databaseError) {
Log.d("TAG", databaseError.getMessage()); //Don't ignore errors!
}
});
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