最佳答案
刚刚测试过,它有效!
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference reference = database.getReference("drivers");
Query query = reference.orderByChild("online").equalTo("true");
query.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Log.d(TAG, dataSnapshot.toString());
}
public void onCancelled(DatabaseError databaseError) { }
});
关于android - 如何从 firebase 数据库中提取所有在线用户的用户名。,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38870998/