Question

让我直截了当。我已经多次搜索过RECYCLE VIEW和CARD VIEW。我已经尝试了很多提示，但我仍然无法找出哪一个是最好的和最新的。

我觉得这个firebase-ui（FirebaseRecyclerAdapter）是最容易在循环视图和卡片视图中实现的。

“implementation'com.firebaseui：firebase-ui-database：4.0.1'”

我发现的是

的错误

@Override  //It says 'Method does not override from its superclass.
protected void populateViewHolder(HomeViewHolder homeViewHolder, home model, int position){
homeViewHolder.setTitle(model.getTitle());
homeViewHolder.setShortDescription(model.getShortDescription());
}

我认为这个版本不适用于4.0.1的最新更新

我把代码放在Fragment中。

FragmentHome.java

package my.package.sports;


import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.support.v7.widget.CardView;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;


/**
 * A simple {@link Fragment} subclass.
 */
public class FragmentHome extends Fragment {

    private FirebaseRecyclerAdapter firebaseRecyclerAdapterHome;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View mainView = inflater.inflate(R.layout.fragment_home, container, false);
        DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference().child("home");
        databaseReference.keepSynced(true);
        RecyclerView recyclerView = mainView.findViewById(R.id.recycleView);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        //FirebaseRecyclerAdapter
        firebaseRecyclerAdapterHome = new FirebaseRecyclerAdapter<home, HomeViewHolder>(home.class, R.layout.home_row, HomeViewHolder.class, databaseReference) {
            @NonNull
            @Override
            public HomeViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                return null;
            }

            @Override
            protected void onBindViewHolder(HomeViewHolder holder, int position, home model) {
            }

            @Override  //It says 'Method does not override from its superclass.(Only Here the Error)
            protected void populateViewHolder(HomeViewHolder homeViewHolder, home model, int position) {
                homeViewHolder.setTitle(model.getTitle());
                homeViewHolder.setShortDescription(model.getShortDescription());
            }
        };
        recyclerView.setAdapter(firebaseRecyclerAdapterHome);

        return mainView;
    }

    public static class HomeViewHolder extends RecyclerView.ViewHolder {
        View viewData;
        public HomeViewHolder(View viewItem) {
            super(viewItem);
            viewData = viewItem;
        }
        public void setTitle(String title) {
            TextView textViewTitle = viewData.findViewById(R.id.home_row_title);
            textViewTitle.setText(title);
        }
        public void setShortDescription(String shortDescription) {
            TextView textViewShortDescription = viewData.findViewById(R.id.home_row_short_description);
            textViewShortDescription.setText(shortDescription);
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        firebaseRecyclerAdapterHome.startListening();
    }

    @Override
    public void onStop() {
        super.onStop();
        firebaseRecyclerAdapterHome.stopListening();
    }
}

home.class

package my.package.sports;

public class home {

    private String title;
    private String shortDescription;

    home() {

    }

    public home(String title, String shortDescription) {
        this.title = title;
        this.shortDescription = shortDescription;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getShortDescription() {
        return shortDescription;
    }

    public void setShortDescription(String shortDescription) {
        this.shortDescription = shortDescription;
    }
}

fragment_home.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".FragmentHome">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycleView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>

home_row.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/cardView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="7dp"
    android:elevation="90dp"
    android:orientation="vertical"
    app:cardCornerRadius="11dp">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="245dp"
        android:background="@color/colorPrimaryDark"
        android:orientation="vertical">

        <TextView
            android:id="@+id/home_row_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingLeft="7dp"
            android:text="Title"
            android:textColor="@color/colorText"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/home_row_short_description"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingLeft="7dp"
            android:text="Short Description" />

    </LinearLayout>
</android.support.v7.widget.CardView>

请帮我制作recycleView和cardView for Fragment并申请firebase。

Answer 1

您应该使用THIS指南详细说明如何使用

您应该使用此结构以使用Firebase-UI填充RecyclerView

FirebaseRecyclerAdapter将Query绑定到RecyclerView。添加，删除或更改数据时，这些更新会自动实时应用于您的UI。

首先，通过构建FirebaseRecyclerOptions来配置适配器。

FirebaseRecyclerOptions<home> options =
                new FirebaseRecyclerOptions.Builder<home>()
                        .setQuery(query, home.class)
                        .build();

接下来创建FirebaseRecyclerAdapter对象。您应该已经有一个ViewHolder子类来显示每个项目

FirebaseRecyclerAdapter adapter = new FirebaseRecyclerAdapter<home, HomeViewHolder>(options) {
    @Override
    public HomeViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // Create a new instance of the ViewHolder, in this case we are using a custom
        // layout called R.layout.message for each item
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.message, parent, false);

        return new HomeViewHolder(view);
    }

    @Override
    protected void onBindViewHolder(HomeViewHolder holder, int position, home model) {
        // Bind the Chat object to the ChatHolder
        // ...
    }
};

并且不要忘记这个

@Override
protected void onStart() {
    super.onStart();
    adapter.startListening();
}

@Override
protected void onStop() {
    super.onStop();
    adapter.stopListening();
}

Answer 2

我已经通过降级firebaseui解决了我的问题。

实施＆＃39; com.firebaseui：firebase-ui-database：0.4.0＆＃39;

我使用populateViewHolder，因为它支持0.4.0

 FirebaseRecyclerAdapter<home, HomeViewHolder> firebaseRecyclerAdapterHome =
                new FirebaseRecyclerAdapter<home, HomeViewHolder>(
                        home.class,
                        R.layout.home_row,
                        HomeViewHolder.class,
                        databaseReference
                ) {
                    @Override
                    protected void populateViewHolder(HomeViewHolder viewHolder, home model, int position) {
                        viewHolder.setDetails(getContext(), model.getImage(),model.getTitle(), model.getDate(), model.getShortDescription());
                    }
                };
        //setAdapter
        recyclerView.setAdapter(firebaseRecyclerAdapterHome);

是否有任何简单的方法可以使FirebaseRecyclerAdapter用于实现'com.firebaseui：firebase-ui-database：4.0.1'

2 个答案: