使用FirebaseUI从Firebase数据库读取数据到Recycleview

问题描述

如何从firebase数据库中读取计数器，这是结构：enter image description here

思路：

设备和计数器类

public class Counters implements Serializable {
private String CounterName;
private String CounterNumber;
public Counters (){

}
public Counters(String CounterNumber,String CounterName){
    this.CounterNumber=CounterNumber;
    this.CounterName=CounterName;
}
public String getCounterName() {
    return CounterName;
}

public void setCounterName(String counterName) {
    this.CounterName = counterName;
}

public String getCounterNumber() {
    return CounterNumber;
}

public void setCounterNumber(String counterNumber) {
    this.CounterNumber = counterNumber;
}

}

public class Device {

private String title;
private Map CounterNumber;
private Counters counters;

public void setCounter(Map CounterNumber){
    this.CounterNumber=CounterNumber;
}
public Map getCounter(){
    return CounterNumber;
}
public Counters getCounters(){
    return counters;
}
public void setCounters(Counters counters){
    this.counters=counters;
}
public Device(){

}
public Device(String title){
    this.title=title;
}

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

}

这是我的查询

 private void displayDevices(){
        options=
                new FirebaseRecyclerOptions.Builder()
                        .setQuery(databaseReference.child("devices").orderByChild("user_id").equalTo(userid),Device.class).build();


        adapter=
                new FirebaseRecyclerAdapter(options) {
                    @Override
                    protected void onBindViewHolder(@NonNull MyRecyclerViewHolder holder, int position, @NonNull Device model) {
                        holder.txt_title.setText(model.getTitle());
                        //holder.txt_counter.setText(model.getCounters().getCounterNumber());
                        counters.add(model.getCounters().getCounterNumber());
                        Log.e(TAG,counters.toString());