FirebaseRecyclerAdaptor不会填充recyclerview

Question

您好，我对firebase比较陌生，我已经看到了firebase RecolyerView适配器用于Fragment的新实现。我的问题是应用程序不会填充我的回收视图。这是我的代码

我的碎片

public class DummyFragment extends android.support.v4.app.Fragment {
private FirebaseRecyclerAdapter<Product, ProductViewHolder> mFirebaseAdapter;
private RecyclerView mProduceList = null;
private View rootView;
private Context c;
private LinearLayoutManager manager;

public DummyFragment() {}
public static DummyFragment newInstance() {
    DummyFragment fragment = new DummyFragment();
    return fragment;
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
    rootView = inflater.inflate(R.layout.dummy_fragment, container, false);
    FirebaseApp.initializeApp(c);
    mProduceList = rootView.findViewById(R.id.recyclerView);
    mProduceList.hasFixedSize();
    mProduceList.setLayoutManager(new LinearLayoutManager(getActivity()));
    DatabaseReference productRef = FirebaseDatabase.getInstance().getReference().child("Product1");
    Query productQuery = productRef.orderByKey();

    FirebaseRecyclerOptions productOptions = new FirebaseRecyclerOptions.Builder<Product>().setQuery(productQuery, Product.class).build();

    mFirebaseAdapter = new FirebaseRecyclerAdapter<Product, ProductViewHolder>(productOptions) {
        @Override
        public ProductViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View rootView = LayoutInflater.from(c).inflate(R.layout.dummy_fragment, parent, false);
            return new ProductViewHolder(rootView);
        }

        @Override
        protected void onBindViewHolder(ProductViewHolder viewHolder, int position, Product model) {
            viewHolder.setTitle(model.getTitle());
            viewHolder.setDesc(model.getDesc());
        }
    };
    mProduceList.setAdapter(mFirebaseAdapter);
    return rootView;
};
@Override
public void onStart() {
    super.onStart();
    mFirebaseAdapter.startListening();
}

@Override
public void onStop() {
    super.onStop();
    mFirebaseAdapter.stopListening();
}
public static class ProductViewHolder extends RecyclerView.ViewHolder {

    View mView;
    public ProductViewHolder(View itemView) {
        super(itemView);
        mView = itemView;
    }
    public void setTitle(String name) {
        TextView post_name = (TextView) mView.findViewById(R.id.productTitle);
        post_name.setText(name);
    }
    public void setDesc(String type) {
        TextView post_type = (TextView) mView.findViewById(R.id.productDesc);
        post_type.setText(type);
    }
}
}

产品类别

public class Product {
String Title,Description;
private String image;
public Product(){}

public Product(String title,String desc, String image){
    Title = title;
    Description = desc;
    this.image = image;
}
public String getTitle() {
    return Title;
}

public void setTitle(String title) {
    Title = title;
}

public String getDesc() {
    return Description;
}

public void setDesc(String desc) {
    Description = desc;
}

public String getImage() {
    return image;
}

public void setImage(String image) {
    this.image = image;
}
}

还有我的舱单

<?xml version="1.0" encoding="utf-8"?>

null

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.AppCompat.DayNight.NoActionBar">
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

我看不出为什么它不会填充recyclerview的原因，但我想我遗漏了一些东西。这是我在控制台中也有的一条消息,w/fa:Service connection Failed：ConnectionResult{statuscode=service_version_update_required,resolution=null,message=null}I/fa:找不到标记管理器,因此不会使用d/fa:日志记录事件(FE):screen_view(_vs),bundle[{firebase_event_origin(_o)=auto,firebase_screen_class(_sc)=mainactivity,需要11910000但找到9879470 V/FA：正在处理排队的服务任务：4 E/FA：正在丢弃数据。无法发送应用程序启动E/FA：无法获取应用程序实例id E/FA：无法将当前屏幕发送到服务E/FA：正在丢弃数据.无法将事件发送到服务[03-15 00:06:26.003 539 9:5417D/]HostConnection：：Get（）建立了新的主机连接0x98C0AC40,tid 5417

Answer 1

要解决这个问题，请删除后面的代码行：

mProduceList.hasFixedSize();

更多信息，请在GitHub上找到这个类似问题的答案。

Answer 2

请执行以下操作之一：

1. 大多数Firebase服务都需要更新的Google Play服务，所以您需要在android模拟器上测试它，而不是Geneymotion模拟器。
2. 如果您正在使用电话身份验证，您的唯一选择是使用真实设备。
3. 有时您需要更新您的实际设备Google play Services：为此，最简单的方法是使用一个名为：play Services Info
的应用程序