firebase android开发中通过循环从子节点获取具体数据

implementation 'com.google.firebase:firebase-database:20.0.1'

FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference rootRef = database.getReference();

DatabaseReference usersRef = rootRef.child("users");
usersRef.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for (DataSnapshot userSnapshot : dataSnapshot.getChildren()) {
            String userId = userSnapshot.getKey(); // 获取用户ID
            String name = userSnapshot.child("name").getValue(String.class); // 获取用户姓名
            String email = userSnapshot.child("email").getValue(String.class); // 获取用户邮箱

            // 在这里可以对获取到的数据进行处理或展示
            Log.d("User", "ID: " + userId + ", Name: " + name + ", Email: " + email);
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        Log.e("Firebase", "Error retrieving data", databaseError.toException());
    }
});