How to retrieve the list of data under 1 child in Firebase Database in Android Studio

Data stored in firebase:

29-06-2018(date)

-AAAA
-25142(jobno)
-Park station(address)
-BMW(model)

-BBBB
-85142(jobno)
-Base station(address)
-Ford(model)


Here I want all the children under -BBBB. Don't want to loop through AAAA. How to get directly the child of BBBB. I'm having data (date, BBBB). Just want to get jobno, address, model of BBBB. Please suggest me a solution.

My code is here

DatabaseReference database = FirebaseDatabase.getInstance().getReference();
DatabaseReference pwd = database.child("29-06-2018").child("BBBB");

pwd.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot ds : dataSnapshot.getChildren()) {
String a = ds.child("jobno").getValue(String.class);
String b = ds.child("address").getValue(String.class);
String c = ds.child("model").getValue(String.class);

}
}

@Override
public void onCancelled(DatabaseError error) {

}

});


2 Answers
2

You're listening to a single child /29-06-2018/BBBB. By looping over dataSnapshot.getChildren() you're looping over each property, and then try to reach a child property for each. That won't work, so you should get rid of the loop in onDataChange:

/29-06-2018/BBBB

dataSnapshot.getChildren()

onDataChange

pwd.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot ds) {
String a = ds.child("jobno").getValue(String.class);
String b = ds.child("address").getValue(String.class);
String c = ds.child("model").getValue(String.class);
}


Thanks for the solution and quick response. just a small change in your code not "ds" its "dataSnapshot" .
– mohan
Jun 29 at 14:42

Woops, good catch! Fixed.
– Frank van Puffelen
Jun 29 at 14:50

DatabaseReference database = FirebaseDatabase.getInstance().getReference();
DatabaseReference pwd = database.child("29-06-2018").child("BBBB");

pwd.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {

String a = dataSnapshot.child("jobno").getValue(String.class);
String b = dataSnapshot.child("address").getValue(String.class);
String c = dataSnapshot.child("model").getValue(String.class);


}

@Override
public void onCancelled(DatabaseError error) {

}

});


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