从Firebase ChildEventListener中检索所有子项

ChildEventListener childEventListener = new ChildEventListener() {
    @Override
    public void onChildAdded(DataSnapshot dataSnapshot, String previousChildName) {
        // 子项添加时的处理逻辑
    }

    @Override
    public void onChildChanged(DataSnapshot dataSnapshot, String previousChildName) {
        // 子项修改时的处理逻辑
    }

    @Override
    public void onChildRemoved(DataSnapshot dataSnapshot) {
        // 子项删除时的处理逻辑
    }

    @Override
    public void onChildMoved(DataSnapshot dataSnapshot, String previousChildName) {
        // 子项移动时的处理逻辑
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        // 取消监听时的处理逻辑
    }
};

DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("your_node");
databaseReference.addChildEventListener(childEventListener);