android - 使用 GeoFire 在 android 中填充 Firebase Recycler View

Question

我想填充我的回收站 View ，这样我就可以看到附近的人/地点。我正在使用 GeoFire 查询我的数据库，它看起来像这样。

 GeoQuery geoQuery = geoFire.queryAtLocation(new GeoLocation(latLngCenter.latitude, latLngCenter.longitude), 0.1);
        geoQuery.addGeoQueryEventListener(new GeoQueryEventListener() {
            @Override
            public void onKeyEntered(String key, GeoLocation location) {
                System.out.println(String.format("Key %s entered the search area at [%f,%f]", key, location.latitude, location.longitude));
                Log.e("TAG", key + location.latitude + location.longitude);

            }

            @Override
            public void onKeyExited(String key) {
                System.out.println(String.format("Key %s is no longer in the search area", key));
            }

            @Override
            public void onKeyMoved(String key, GeoLocation location) {
                System.out.println(String.format("Key %s moved within the search area to [%f,%f]", key, location.latitude, location.longitude));
                Log.e("TAG", key + location.latitude + location.longitude);
            }

            @Override
            public void onGeoQueryReady() {
                System.out.println("All initial data has been loaded and events have been fired!");
            }

            @Override
            public void onGeoQueryError(DatabaseError error) {
                System.err.println("There was an error with this query: " + error);
            }
        });

我正在使用这个 Firebase RecyclerView

 RecyclerView recycler = (RecyclerView) findViewById(R.id.RecyclerView);
    recycler.setHasFixedSize(true);
    recycler.setLayoutManager(new LinearLayoutManager(this));

    FirebaseRecyclerAdapter<Chat, ChatHolder> mAdapter = new FirebaseRecyclerAdapter<Chat, ChatHolder>(Chat.class, R.layout.recyclerview, ChatHolder.class, mUsers) {


        @Override
        public void populateViewHolder(final ChatHolder chatMessageViewHolder, final Chat chatMessage, int position) {


                    chatMessageViewHolder.setName(chatMessage.getName());
                    chatMessageViewHolder.setText(chatMessage.getText());
                    chatMessageViewHolder.setTimestamp(chatMessage.getTimestamp());



        }
    };
    recycler.setAdapter(mAdapter);

使用这些 Chat Holder 类和聊天对象类

public static class ChatHolder extends RecyclerView.ViewHolder {
    View mView;

    public ChatHolder(View itemView) {
        super(itemView);
        mView = itemView;
    }



    public void setName(String name) {
        TextView field = (TextView) mView.findViewById(R.id.textViewName);
        field.setText(name);
    }

    public void setText(String text) {
        TextView field = (TextView) mView.findViewById(R.id.textViewMessage);
        field.setText(text);
    }

    public void setTimestamp(String text) {
        TextView field = (TextView) mView.findViewById(R.id.textViewTime);
        field.setText(text);
    }
}

public static class Chat {

    String name;
    String text;
    String uid;
    String timestamp;

    public Chat() {
    }

    public Chat(String name, String uid, String message, String timestamp) {
        this.name = name;
        this.text = message;
        this.uid = uid;
        this.timestamp = timestamp;
    }

    public String getName() {
        return name;
    }

    public String getUid() {
        return uid;
    }

    public String getText() {
        return text;
    }

    public String getTimestamp() {
        return timestamp;
    }
}

目前，FirebaseUI 库中提供的这个适配器填充 recyclerview，以便只使用一个引用，所有子事件都显示在 View 中，现在，我想填充我的 recyclerView，这样每当输入一个键时，它就会根据我的键填充我的 recyclerview = 到我的引用，这就是我的 firebase 数据库的样子 my firebase database

Answer 1

将您从 geofire 检索到的所有数据(也是 uid)推送到新节点以将 geofire 结果存储在 firebase 中会更简单，例如

my-node //your new firebase node to store all uids retrieved from geofire
- {chatUid}: true //true is just a dummy data, you can use anything else except null and empty string.
- {chatUid}: true
- ...

并将 FirebaseRecyclerAdapter ref 设置到该节点。

DatabaseReference ref = FirebaseDatabase.getInstance().getReference("my-node");
FirebaseRecyclerAdapter fra = new FirebaseRecyclerAdapter<Boolean, MyVH>(Boolean.class, R.layout.my_layout, MyVH.class, ref) { ... }

然后，在 FirebaseRecyclerAdapter 实现的 populateViewHolder() 方法中，您可以使用 String 键从包含数据的主节点获取数据。

public void populateViewHolder(MyVH viewHolder, Boolean model, int position){
    // Get references of child views
    final TextView nameTextView = viewHolder.getItemView().findViewById(R.id.my_name_text_view_in_vh_layout);
    final TextView addressTextView = viewHolder.getItemView().findViewById(R.id.my_address_text_view_in_vh_layout);

    // Key in this position.
    String key = getRef(position).key;

    // Query the full data of the current key located in the `main-data-node`
    FirebaseDatabase.getInstance().getReference("main-data-node").child(key).addValueEventListener(new ValueEventListener(){
        ... //Truncated onCancelled

        @Override
        public void onDataChange(snap: DataSnapshot){
            MyDataModel model = snap.getValue(MyDataModel.class);

            nameTextView = model.getName();
            addressTextView = model.getAddress();
        }
    }
}

// The data model class
public class MyDataModel { 
    private String name; 
    private String address; 
    ... // Truncated getter, setter, constructor
}

对于 geofire 结果的任何变化，只需将这些结果推送到 my-node，它会自动通知您的 FirebaseRecyclerAdapter。

附言我懒得将我的解决方案与您的数据模型相匹配(抱歉)，所以我制作了一个简化的示例类，因此如果有人偶然发现了这个，他们可以更容易地理解它。

附言我已经有一段时间没有使用 java 编写代码了，我主要使用 kotlin(你很快应该也会了，哈哈)，所以，如果那里有语法错误，请随时进行编辑。