单击 ListView 项目时如何加载 Firebase DB 值的详细活动

Posted 2023-04-19

【中文标题】单击 ListView 项目时如何加载 Firebase DB 值的详细活动

【英文标题】：How to load Firebase DB Vaule on detail activity when ListView Item Clicked

【发布时间】：2018-01-16 23:01:56

【问题描述】：

我正在开发使用 Firebase 数据库作为后端的 android 应用程序。列出从我的 Json 密钥中检索到的项目。例如：-

 
    "Player3" : 
        "LY" : "ewfw",
        "Ty" : "rwerw"
      
  

然后，“LY”和“TY”将加载到作为列表视图项目（工作正常）。在我想要的是当“LY”或“TY”（列表视图项目）单击“ewfw”或“rwerw”时将显示在详细活动中。问题是仅在详细活动上显示键而不是值。我如何加载详细活动的价值？ 这是我的代码...

ListItemActivity.Java

public class ListItemActivity5 extends Fragment 
    private static final String TAG = "Tab4Fragment";
    //String[] values = new String[]"", "", "", "", "", "", "", "", "";
    ListView listView;
    TextView textView;
    Array array;
    RelativeLayout relativeLayout;
    ViewGroup.LayoutParams layoutparams;
    private DatabaseReference mDatabase;
    RelativeLayout container;
    AnimationDrawable anim;
    Context context;

    //private TextView text;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, @Nullable Bundle savedInstanceState) 
        View view = inflater.inflate(R.layout.activity_conferance, container, false);
        //text = (TextView) view.findViewById(R.id.textView1);
        listView = (ListView) view.findViewById(R.id.list);
        container = (RelativeLayout) view.findViewById(R.id.container5);
        final TextView textView1 = (TextView) view.findViewById(R.id.textView1);
        anim = (AnimationDrawable) container.getBackground();
        anim.setEnterFadeDuration(2000);
        anim.setExitFadeDuration(3000);
        final ListView listView = (ListView) view.findViewById(R.id.list);
        final ArrayList<String> friends = new ArrayList<String>();

        mDatabase = FirebaseDatabase.getInstance().getReference("Player");
        mDatabase.addValueEventListener(new ValueEventListener() 
            @Override
            public void onDataChange(final DataSnapshot dataSnapshot) 
                friends.clear();
                for (final DataSnapshot player : dataSnapshot.getChildren()) 
                    Log.i("Player", player.getKey());
                    friends.add(player.getKey());
                    player.getValue();


                    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() 
                        public void onItemClick(AdapterView<?> parent, View view,
                                                int position, long id) 
                            player.getValue();
                            //player2 = (String) String.valueOf(player.getValue());
                            //String topic = String.valueOf(player.getValue());
                            //topic = (String) parent.getItemAtPosition(position);
                            Intent intent = new Intent(getContext(), Details.class);

                            intent.putExtra("key", String.valueOf(player.getValue()));

                            startActivity(intent);


                        

                    );
                
                ArrayAdapter arrayAdapter = new ArrayAdapter(getContext(), android.R.layout.simple_list_item_1,
                        friends) 

                    @Override
                    public View getView(int position, View convertView, ViewGroup parent) 

                        View view = super.getView(position, convertView, parent);

                        layoutparams = view.getLayoutParams();
                        TextView textView = (TextView) view.findViewById(android.R.id.text1);

            /*YOUR CHOICE OF COLOR*/
                        textView.setTextColor(Color.WHITE);
                        textView.setTextSize(22);

                        //Define your height here.
                        //layoutparams.height = 240;

                        view.setLayoutParams(layoutparams);

                        return view;


                    
                ;
                listView.setAdapter(arrayAdapter);
            

            @Override
            public void onCancelled(DatabaseError databaseError) 

            


        );

        return view;
    

Details.Java

public class Details extends Activity 
    RelativeLayout container;
    AnimationDrawable anim;
    ScrollView mScrollView;
    TextView textView1;
    private DatabaseReference mDatabase;
    private ListItemActivity1 mylist1;
    private DataSnapshot dataSnapshot;
    FloatingActionButton floatingActionButton;
    private ListItemActivity5 listItemActivity5;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ab1);

        textView1 = (TextView) findViewById(R.id.textView1);
        //mref = new Firebase("https://tafach-love-2.firebaseio.com/");
        Intent intent = getIntent();

        if(intent.hasExtra("key"))
            textView1.setText(intent.getStringExtra("key"));
        
        textView1.setMovementMethod(new ScrollingMovementMethod());

 

感谢您的帮助。

【问题讨论】：

您面临的问题是什么？

当我将 Friends.get(position) 放在 Intent 上时，会显示 getKey()。我想要的是要显示的键的值

您是否从 Firebase DB 获得了正确的值？

我正在从 Firebase DB 获取密钥，但我需要从 Firebase DB 获取值以获取详细信息

将加载来自 Firebase DB 的列表视图键，当单击列表项时，我希望键的相应值显示在另一个活动上

【参考方案1】：

我的问题得到了答案。我将这些行放在 List ItemActivity 上的代码中，并在 ChildEventListner 而不是 AddEventLister 中设置 onclickListner ...

 mDatabase.addChildEventListener(new ChildEventListener() 
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) 
                final String playerName = dataSnapshot.getValue(String.class);
                hy.add(playerName);
                listView.setOnItemClickListener(new AdapterView.OnItemClickListener() 
                    public void onItemClick(AdapterView<?> parent, View view,
                                            int position, long id) 
                        //player.getValue();
                        //player2 = (String) String.valueOf(player.getValue());
                        //String topic = String.valueOf(player.getValue());
                        //topic = (String) parent.getItemAtPosition(position);
                        Intent intent = new Intent(getContext(), Details.class);

                        intent.putExtra("key", String.valueOf(hy.get(position)));

                        startActivity(intent);


                    

                );