Firebase retrieve all child values and displayed

Question

Firebase android: how to retrieve all users contact and show them using recyclerview ? help me please. thank you in advance.

my database screenshot

Possible duplicate please try googling before asking here in community thanks. Check this link https://stackoverflow.com/questions/43293935/how-to-get-child-of-child-value-from-firebase-in-android — Cyrille Con Morales, Sep 05 '19 at 02:39
No... Look at the image of my database. I want to select child who have different parents — deslok, Sep 05 '19 at 07:31
For future reference, it’s a good idea to include code and structures as *text*, not links and images. That way, if they are needed in an answer, they can be copied and pasted. To get your Firebase structure, use the Firebase console->Export JSON and copy and paste a snippet of your structure. See [images and links are evil](http://idownvotedbecau.se/imageofcode) — Jay, Sep 05 '19 at 18:50

score 0 · Accepted Answer · answered Sep 05 '19 at 07:43

Based on your database structure

Your database structure is kind a broken but you can try this

Users = FirebaseDatabase.getInstance().getReference("users");
Contacts = FirebaseDatabase.getInstance().getReference("users");

Users.addValueEventListener(new ValueEventListener() {
      @Override
      public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
          for(DataSnapshot userKeys:dataSnapshot.getChildren()){
              //get All the users
              final String users = userKeys.getKey();
              //get contacts
              Contacts.child(users).child("contact").addValueEventListener(new ValueEventListener() {
                  @Override
                  public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                      for(DataSnapshot contacts:dataSnapshot.getChildren()){
                          String contact = contacts.getValue(String.class);
                          Toast.makeText(getApplicationContext(),contact+"of"+users,Toast.LENGTH_SHORT).show();
                      }
                  }

                  @Override
                  public void onCancelled(@NonNull DatabaseError databaseError) {

                  }
              });
              //end of get contact
          }
          //End of for each
      }

      @Override
      public void onCancelled(@NonNull DatabaseError databaseError) {

      }
  });

Please... how to display the list of contacts that I retrieved using recyclerview — deslok, Sep 05 '19 at 08:34
Actually it will be a long convo when we continue this but search it on youtube for tutorials it would be easy to understand. — Cyrille Con Morales, Sep 05 '19 at 08:37

Firebase retrieve all child values and displayed

1 Answers1