How to apply multiple query in android firebase?
<p><strong>This is My Firebase database structure</strong>
<a href="https://i.stack.imgur.com/wUyfB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wUyfB.png" alt="this my firbase database structure"></a></p>

<p>i want to get data like </p>

<p><strong>category</strong> = "cat" and <strong>level</strong> = "1"</p>

<p><strong>Here is my code</strong></p>

<pre><code> Query query = firebaseReference.orderByChild("category").equalTo("cat1").limitToFirst(20);

        query.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                UTILS.Log.e(TAG, "List Of User Count " + dataSnapshot.getChildrenCount());

                for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {

                    //FCreateUSer modelRegister = dataSnapshot1.getValue(FCreateUSer.class);
                    UTILS.Log.e(TAG, "User Email :" + dataSnapshot1.child("question").getValue());

                }
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }

        });
</code></pre>

<p>it's wrok but how to use two condition in firbase i try two <code>orderByChild</code>  but it's give error <strong>java.lang.IllegalArgumentException: You can't combine multiple orderBy calls!</strong></p>