• 使用 Firebase 在 Unity 中加载列表列表字典（unity列表添加数据）
• android – Firebase无限滚动列表视图滚动加载10项
• android – 使用FirebaseOptions的Init firebase
• Android 中 Unity 的 Firebase 分析仪表板中没有数据
• c# – Unity Firebase中的InitializationException

使用 Firebase 在 Unity 中加载列表列表字典（unity列表添加数据）

我认为可能发生的情况是 var loadedDict = result.Value as Dictionary<string,List<List<string>>>; 没有立即进行转换。

我会检查以下内容。

1.- 数据在保存阶段被正确保存，并存储在数据库中并在问题中确认。

2.- 即使字典为空，检查任务返回的数据是否为空。因为可能正在 var result = task.Result; 中检索数据，但转换为字典不起作用。如果是这种情况，我也会在问题中确认这一点。

3.- 如果数据实际上是在第 2 阶段检索的，那么转换无效。就 documentation 而言，返回的原生类型的值是：

bool、string、long、double、IDictionary{string,object} 和 List{object}

如果您正在接收数据但 loadedDict 为空，您将需要编写将 IDictionary{string,object} 转换为您的 Dictionary<string,List<List<string>>> 并填写您的信息的方法。

我没有统一使用 firebase，仅在 Web 项目中使用，所以我不确定这是否可能是您的问题，这只是我的猜测。我很乐意检查您的发现

android – Firebase无限滚动列表视图滚动加载10项

参见英文答案 > Get the data from the Firebase in limit to perform pull to refresh and load more functionality                                    2个
我正在寻找一种方法来实现在我的Firebase应用程序中滚动的简单列表视图,但我没有找到任何方法如何实现它.我已经在互联网上尝试了2-3个教程和文档,但没有达到要求的结果.

在我的应用程序中,我希望滚动像开始前10个列表项加载然后每次滚动接下来10或20项将加载,直到最后一项出现在列表的底部.

所以我尝试通过以下方式检索前10个项目：

ArrayList<Event> event=new ArrayList<>();

Dbref = FirebaseDatabase.getInstance().getReference("/event");
Dbref.startAt(1).limitToLast(10).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                Log.e("Events.java ", "range query started! : " + dataSnapshot.getChildrenCount());
                String event_id = snapshot.child("details").child("event_id").getValue().toString();
                e=new Event(event_id); //Event is a model class for list items
                event.add(e);
                Log.e("ShowEventInfo : ", "" + event_id);
            }
        }
        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
    adapter=new Event_CustomAdapter(getActivity(),event); 
    ls.setAdapter(adapter); //here ls is instance of ListView

我推荐这个Youtube视频来实现这个功能：
(https://www.youtube.com/watch?annotation_id=annotation_3916642001&feature=iv&src_vid=YMJSBHAZsso&v=XwIKb_f0Y_w)

在上面的代码中,正如您所看到的,我正在生成Log以检查是否从firebase获取了数据,但是我没有输出Android监视器.

我不知道如何在列表视图中实现Firebase滚动.我认为对于那些在回收站视图/列表视图中实现无限滚动的人来说,这是一个常见问题.

你能帮我实现这个功能吗？谢谢.

解决方法:

这里我们将使用DatabaseReference;的limitToFirst(int)或limitToLast(int)方法从FireBase获取第一个或最后一个记录.

在下面的示例中,我使用limitToFirst(int)仅从Firebase获取最高指定记录.在这里,我正在使用oldestPostId,这是我们记录的最后一个或第十个键.

  private String oldestPostId;
  DatabaseReference Dbref = FirebaseDatabase.getInstance().getReference("/event");


  /////GETTING FirsT 10 RECORDS FROM THE FIREBASE HERE

        Dbref.limitToFirst(10).addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot child : dataSnapshot.getChildren()) {

                    oldestPostId = child.getKey(); ////HERE WE ARE SAVING THE LAST POST_ID FROM URS POST

                    dataSnapshot.getChildrenCount());
                    String event_id = snapshot.child("details").child("event_id").getValue().toString();
                    e=new Event(event_id); //Event is a model class for list items
                    event.add(e);
                    Log.e("ShowEventInfo : ", "" + event_id);
                }      
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

从上面的代码,我已经从firebase获得前10条记录,现在我们将实现加载更多功能,所以我使用Listview的onscrolllistener
在isScrollCompleted()上,我们将使用orderByKey()通过limitToFirst()方法进一步获取10条记录.我已经实现了整个代码以获取有关isScrollCompleted()的更多数据,请查看以下示例.

YOUR_LISTVIEW.setonScrollListener(new OnScrollListener() {
    private int currentVisibleItemCount;
    private int currentScrollState;
    private int currentFirstVisibleItem;
    private int totalItem;
    private LinearLayout lBelow;


    @Override
    public void onScrollStateChanged (AbsListView view,int scrollState){
        // Todo Auto-generated method stub
        this.currentScrollState = scrollState;
        this.isScrollCompleted();
    }

    @Override
    public void onScroll (AbsListView view,int firstVisibleItem,
    int visibleItemCount, int totalItemCount){
        // Todo Auto-generated method stub
        this.currentFirstVisibleItem = firstVisibleItem;
        this.currentVisibleItemCount = visibleItemCount;
        this.totalItem = totalItemCount;


    }

    private void isScrollCompleted () {
        if (totalItem - currentFirstVisibleItem == currentVisibleItemCount
                && this.currentScrollState == SCROLL_STATE_IDLE) {
            /** To do code here*/
            Dbref.orderByKey().startAt(oldestPostId).limitToFirst(10).addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    for (DataSnapshot child : dataSnapshot.getChildren()) {

                        oldestPostId = child.getKey();
                        String event_id = snapshot.child("details").child("event_id").getValue().toString();
                        e = new Event(event_id); //Event is a model class for list items
                        event.add(e);
                        Log.e("ShowEventInfo : ", "" + event_id);
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

        }
    });

});

android – 使用FirebaseOptions的Init firebase

<provider
    android:name="com.google.firebase.provider.FirebaseInitProvider"
    android:authorities="${applicationId}.firebaseinitprovider"
    tools:node="remove"/>

FirebaSEOptions options = new FirebaSEOptions.Builder()
                .setApplicationId("valid_app_id")
                .setGcmSenderId("valid_gcm_sender_id")
                .setApiKey("valid_api_key")
                .build();

FirebaseApp.initializeApp(getApplicationContext(),options);

google_app_id:

{YOUR_CLIENT}/client_info/mobilesdk_app_id
gcm_defaultSenderId:

project_info/project_number
default_web_client_id:

{YOUR_CLIENT}/oauth_client/client_id (client_type == 3)
ga_trackingId:

{YOUR_CLIENT}/services/analytics-service/analytics_property/tracking_id
firebase_database_url:

project_info/firebase_url
google_api_key:

{YOUR_CLIENT}/api_key/current_key
google_crash_reporting_api_key:

{YOUR_CLIENT}/api_key/current_key

<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="your.package"
    >

Android 中 Unity 的 Firebase 分析仪表板中没有数据

DependencyStatus dependencyStatus = DependencyStatus.UnavailableOther;
// Use this for initialization
void Start () 
{
    Debug.Log ("Start FireBase");
    dependencyStatus = FirebaseApp.CheckDependencies();

    if (dependencyStatus != DependencyStatus.Available) 
    {
        FirebaseApp.FixDependenciesAsync().ContinueWith(task => 
        {
            dependencyStatus = FirebaseApp.CheckDependencies();
            if (dependencyStatus == DependencyStatus.Available) 
            {
                Initializefirebase();
            } 
            else 
            {
                Debug.LogError("Could not resolve all Firebase dependencies: " + dependencyStatus);
            }
        });
    } 
    else 
    {
        Initializefirebase();
    }
}

void Initializefirebase() 
{
    FirebaseAnalytic.Instance().setAnalyticsCollectionEnabled(true);
    FirebaseAnalytic.Instance().setUserProperty(FirebaseAnalytics.UserPropertySignUpMethod,"Google");
    FirebaseAnalytic.Instance().setUserId(SystemInfo.deviceUniqueIdentifier);
    FirebaseAnalytic.Instance().logEvent("LogIn",FirebaseAnalytics.EventLogin);
    Debug.Log ("FirebaseAnalytics Logined");
}

I/Unity   (27030): Start FireBase

I/Unity   (27030): (Filename: ./artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 42)
I/Unity   (27030):

I/Unity   (27030): Firebase App initializing app com.boldstatementproductions.mcpro (default 1).

I/Unity   (27030): (Filename: ./artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 42)
I/Unity   (27030):

W/Unity   (27030): Callback module already shut down

W/Unity   (27030): (Filename: ./artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 42)

E/Unity   (27030): java_app

E/Unity   (27030): (Filename: ./artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 42)

I/Unity   (27030): Firebase App initializing app com.boldstatementproductions.mcpro (default 1).

I/Unity   (27030): (Filename: ./artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 42)

W/Unity   (27030): Callback module already shut down

W/Unity   (27030): (Filename: ./artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 42)

E/Unity   (27030): java_app

E/Unity   (27030): (Filename: ./artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 42)

I/Unity   (27030): InitializationException: Failed to initialize the default Firebase App.

I/Unity   (27030):   at Firebase.FirebaseApp.CreateAndTrack (Firebase.CreateDelegate createDelegate) [0x00000] in <filename unkNown>:0

I/Unity   (27030):   at Firebase.FirebaseApp.Create () [0x00000] in <filename unkNown>:0

I/Unity   (27030):   at Firebase.FirebaseApp.get_DefaultInstance () [0x00000] in <filename unkNown>:0

I/Unity   (27030):   at Firebase.Analytics.FirebaseAnalytics..cctor () [0x00000] in <filename unkNown>:0

I/Unity   (27030): Rethrow as TypeInitializationException: An exception was thrown by the type initializer for Firebase.Analytics.FirebaseAnalytics

I/Unity   (27030):   at FirebaseDependencyResolver.Initializefirebase () [0x00000] in <filename unkNown>:0

I/Unity   (27030):   at FirebaseDependencyResolver.Start () [0x00000] in <filename unkNown>:0

I/Unity   (27030): (Filename:  Line: -1)