Android & Firebase : How can i get data from frebase by key

Question

Please how i can get data from firebase with IMEI of the phone.

How i can get listcarte by the phone TPEID!!

And you want to everything that exist under `cartnoir - > 0`, right? — Alex Mamo, Oct 03 '19 at 15:14
For example for the first phone with the IMEI = "869688030960688" it will show [carte1,carte2,carte3,carte4] and for the seconde phone with IMEI="357330078723954" it will show [carte1,carte3] — YASSINECASADEV, Oct 03 '19 at 15:23
I understand now. One more thing before writing an answer. `Tpe` and `Tpe`1` are direct children of the root? Or add a more detailed screenshot. — Alex Mamo, Oct 03 '19 at 15:29
Hi Yassine! The answer that Frank van Puffelen already provided, it's the same as the one I would have given but he was faster ;) You can use as it will solve your issue. — Alex Mamo, Oct 04 '19 at 09:42

score 0 · Answer 1 · answered Oct 03 '19 at 15:32

If the value you're looking for is always in 0/TPEID, then you can use a query to find the nodes that contains that value with:

DatabaseReference ref = FirebaseDatabase.getInstance().getReference(...);
Query query = ref.orderByChild("0/TPEID").equalTo("869688030960688");
query.addListenerForSingleValueEvent(new ValueEventListener() {
  @Override
  public void onDataChange(DataSnapshot dataSnapshot) {
    for (DataSnapshot tpeSnapshot: dataSnapshot.getChildren()) {
        System.out.println(tpeSnapshot.getKey()); // Tpe0
        System.out.println(tpeSnapshot.child("0/TPEID").getValue(String.class)); // 869688030960688
    }
  }

  @Override
  public void onCancelled(DatabaseError databaseError) {
    throw databaseError.toException();
  }
}

If the value is not at a fixed path under each child, you won't be able to search for it with a Firebase query. In that case, see Firebase Query Double Nested, firebase get url by nested child id for tree like, Firebase query if child of child contains a value

Android & Firebase : How can i get data from frebase by key

1 Answers1