Kunal Shah :
I want to fetch the all uid's of the doctor whose category is "abc"(example) and then store those retrieved uid's into an array list
I want same results as displayed by the below sql query
select uid from doctors where category = "abc";
Here is the database structure
Code for next activity is written below
private void loadDoctors() {
ArrayList<String> uid = getIntent().getStringArrayListExtra("doctor_list");
for (int i =0;i<uid.size();i++){
DatabaseReference doctors = FirebaseDatabase.getInstance().getReference("Doctors").child(uid.get(i));
Adapter = new FirebaseRecyclerAdapter<DoctorModel, DoctorViewHolder>(
DoctorModel.class,
R.layout.doctors_home,
DoctorViewHolder.class,
doctors
) {
@Override
protected void populateViewHolder(final DoctorViewHolder viewHolder, final DoctorModel model, int position) {
viewHolder.doctor_name.setText(model.getName());
Glide.with(Doctors.this).load(model.getProfileimage()).into(viewHolder.doctor_image);
viewHolder.qualification.setText(model.getQualification());
viewHolder.rating.setText(model.getRating());
}
};
Adapter.notifyDataSetChanged();
doctors_list.setAdapter(Adapter);
}
Alex Mamo :
To solve this, please use the following lines of code:
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference doctorsRef = rootRef.child("Doctors");
Query categoryQuery = doctorsRef.orderByChild("category").equalTo("Cardiology");
ValueEventListener valueEventListener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
List<String> uidList = new ArrayList<>();
for(DataSnapshot ds : dataSnapshot.getChildren()) {
String uid = ds.getKey();
uidList.add(uid);
}
//Do what you need to do with your list
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Log.d("TAG", databaseError.getMessage()); //Don't ignore errors!
}
};
categoryQuery.addListenerForSingleValueEvent(valueEventListener);
At the end, you'll have a list full of uids. One more thing to note, because Firebease API is asynchronous, you will be able to use that list only inside onDataChange() method.
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