java查找数据库结构中的子节点数量

Question

大家好，有没有办法计算firebase中的儿童数量

我有一个这样的数据库结构

Testitem1{
test: ""
},
Testitem2{
test: ""
}

i want to count only the Testitem nodes

Answer 1

计算firebase实时数据库中的子节点

FirebaseDatabase database = FirebaseDatabase.getInstance(); // get the reference of child containing testitems
DatabaseReference myRef = database.getReference();

myRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
    for (DataSnapshot snap: dataSnapshot.getChildren()) {
        Log.e(snap.getKey(),snap.getChildrenCount() + "");
    }
}

@Override
public void onCancelled(DatabaseError databaseError) {

}
});