Android Firebase 填充到列表视图

Question

需要帮助将 Firebase 信息填充到 ListView。我需要从“商店”中获得所有孩子，但不能。谁知道怎么解决请帮忙。虽然打印消息它给了我正确的数组，但我无法将它实现到 ListView。

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dealer_list_view);

    mListView = (ListView) findViewById(R.id.dealer_listView);

    DatabaseReference ref = FirebaseDatabase.getInstance().getReference();

    ref.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            DataSnapshot friendsSnapshot = dataSnapshot.child("Shops");
            for (DataSnapshot friendSnapshot : friendsSnapshot.getChildren()) {


                String message = friendSnapshot.child("Dealer").getValue(String.class);
                System.out.println(message);

                DatabaseReference ref = FirebaseDatabase.getInstance().getReferenceFromUrl("My URl"+message);

                FirebaseListAdapter<String> adapter = new FirebaseListAdapter<String>(DealerListView.this,
                        String.class,
                        android.R.layout.simple_list_item_1,
                        ref) {

                    @Override
                    protected void populateView(View v, String s, int i) {

     TextView textView = (TextView) v.findViewById(android.R.id.text1);
                        textView.setText(s);
                   }
                };
                mListView.setAdapter(adapter);
            }
        }
        @Override
        public void onCancelled(DatabaseError databaseError) {
        }
    });
}

更新

  - Shops
         -AAA
             Dealer: "AAA"
             Email: "a@mail.ru"
             SAP:   "D666"
         -BBB
             Dealer: "BBB"
             Email:  "r@mail.ru"
             SAP:     "D333"
         -CCC
             Dealer:  "BBB"
             Email:   "g@mail.ru"
             SAP:     "D222"

Answer 1

看来你把事情复杂化了。这应该是您需要的唯一代码：

DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Shops");

FirebaseListAdapter<String> adapter = new FirebaseListAdapter<String>(
    DealerListView.this,
    String.class,
    android.R.layout.simple_list_item_1,
    ref) {
        protected void populateView(View v, String s, int i) {
          TextView textView = (TextView) v.findViewById(android.R.id.text1);
          textView.setText(s);
        }
        protected String parseSnapshot(DataSnapshot snapshot) {
            return snapshot.child("Dealer").getValue(String.class);
        }
};
mListView.setAdapter(adapter);

因此，使用此代码，您可以获得商店快照列表，然后为每个快照提取 parseSnapshot 中 Dealer 属性的值