我需要遍历firebase模式来获取每个 workouts &在recyclerview中显示它。现在我无法使用侦听器遍历firebase中的模式&通过名为 Program .
来自firebase的json

{
  "subscriptions" : {
    "han@gmail,com" : {
      "-KDnhRwHjssOejrqyenP" : {
        "category" : "Strength",
        "goal" : "This workout can be done while on the phone!",
        "length" : 1,
        "title" : "Hello Workouts",
        "weeks" : {
          "week1" : [ "High Knees", "Jumping Jacks", "Wall sit", "Pushups", "Sit-ups", "Step ups", "Squats", "Tricep dips on chair", "Plank", "High Knees running in place", "Lunges", "Pushup and rotation", "Side plank (alternate per round)", "Alternating Push-Up Plank", "Chest Expander", "Diamond Push-ups", "Dive Bomber Push-ups", "Butt Kickers", "Lying Triceps Lifts", "One Arm Side Push-up", "Overhead Arm Clap", "Overhead Press", "Power Circles", "Push-up and Rotation", "T Push-ups", "Reverse Plank", "Spiderman Push-up", "T Raise", "Tricep Dips", "Wall Push-ups", "Wide Arm Push-ups", "Burpees" ]
        }
      },
      "-KDni3TN4NMyGXePyp92" : {
        "category" : "Strength",
        "goal" : "This workout can be done by a BABUJI",
        "length" : 1,
        "title" : "Indian Workouts",
        "weeks" : {
          "week1" : [ "Diamond Pushups", "Jackknives", "Plyo Lunges", "Plyo Squats", "Single leg plank (alternate per round)", "Plyo Lunges", "Pushup and rotation", "Weighted side plank (alternate per round)", "Alternating Push-Up Plank", "Chest Expander", "Diamond Push-ups", "Dive Bomber Push-ups", "One Arm Side Push-up", "Overhead Press", "Push-up and Rotation", "T Push-ups", "Spiderman Push-up", "Wide Arm Push-ups", "Burpee Pushups" ]
        }
      }
    },
    "obama@gmsil,com" : {
      "-KDnfjROKeFAL9wccsxY" : {
        "category" : "Mobility",
        "goal" : "afternoon body weight workout",
        "length" : 1,
        "title" : "Afternoon HiiT",
        "weeks" : {
          "week1" : [ "High Knees", "Squats", "Lunges", "Diamond Push-ups", "Lying Triceps Lifts" ]
        }
      },
      "-KDps90Dn6XtJc6Co00b" : {
        "category" : "Strength",
        "goal" : "goal",
        "length" : 1,
        "title" : "title",
        "weeks" : {
          "week1" : [ "Diamond Pushups", "Jackknives", "Plyo Lunges", "Plyo Squats", "Single leg plank (alternate per round)", "Plyo Lunges", "Pushup and rotation", "Weighted side plank (alternate per round)", "Alternating Push-Up Plank", "Chest Expander", "Diamond Push-ups", "Dive Bomber Push-ups", "One Arm Side Push-up", "Overhead Press", "Push-up and Rotation", "T Push-ups", "Spiderman Push-up", "Wide Arm Push-ups", "Burpee Pushups" ]
        }
      }
    }
  }
  }

侦听器代码

public void FB(){
ref.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot snapshot) {
                    for (DataSnapshot postSnapshot: snapshot.getChildren()) {
                        System.out.println(postSnapshot.getValue());
    //Program post = proSnapshot.getValue(Program.class);
                    }
                }
                @Override
                public void onCancelled(FirebaseError firebaseError) {
                    System.out.println("The read failed: " + firebaseError.getMessage());
                }
            });
        }

logcat公司
03-28 08:52:53.966 23584-23584/com.android.sam i/system.out:{-kdni3tn4nmygxepyp92={weeks={week1=[菱形俯卧撑，jackknifes，plyo弓箭步，plyo下蹲，单腿支撑（每轮交替），plyo弓箭步，俯卧撑和旋转，加权侧支撑（每轮交替），交替俯卧撑支撑，胸部扩张器，菱形俯卧撑，俯卧撑俯卧撑，单臂侧俯卧撑，俯卧撑，俯卧撑和旋转，t型俯卧撑，蜘蛛人俯卧撑，宽臂俯卧撑，波比俯卧撑]}，title=印度式训练，category=力量，length=1，goal=这项训练可以由婴儿完成}，-kdnhrwhjssoejrqyenp={weeks={week1=[高膝，跳高，壁坐，俯卧撑，仰卧撑，踏步，下蹲、三头肌俯卧在椅子上、支架式、高膝原地跑、弓箭步、俯卧撑和旋转、侧支架式（每轮交替）、交替俯卧撑、胸部扩张器、菱形俯卧撑、俯卧撑俯卧撑、踢腿、卧式三头肌举举举、单臂侧俯卧撑、俯卧撑、俯卧撑、力量循环、俯卧撑和旋转，t俯卧撑，反向支撑，蜘蛛人俯卧撑，t抬高，三头肌俯卧撑，墙式俯卧撑，宽臂俯卧撑，burpees]}，title=你好训练，category=力量，length=1，goal=这项训练可以在打电话时完成！}}
03-28 08:52:53.967 23584-23584/com.android.sam i/system.out:{-kdnfjrokefal9wccsxy={weeks={week1=[高膝、深蹲、弓箭步、菱形俯卧撑、卧位三头肌举]}，title=午后hiit，category=机动性，length=1，goal=午后体重训练}，-kdps90dn6xtjc6co00b={weeks={week1=[菱形俯卧撑、长刀、plyo弓箭步、plyo深蹲，单腿支架（每轮交替）、plyo弓箭步、俯卧撑和旋转、加权侧支架（每轮交替）、交替俯卧撑、胸部扩张器、菱形俯卧撑、俯卧撑俯卧撑、单臂侧俯卧撑、俯卧撑和旋转、t形俯卧撑、蜘蛛侠俯卧撑、宽臂俯卧撑、burpee俯卧撑]}，title=title，类别=力量，长度=1，目标=目标}
程序.java

public class Program {
    private String title;

    private String goal;

    private String category;

    private int length;

    HashMap<String, ArrayList<String>> weeks;

    /**
     * Required public constructor
     */
    public Program() {
    }

    public Program(String title, String goal,  String category, int length, HashMap<String, ArrayList<String>> weeks) {
        this.title = title;
        this.goal = goal;
        this.category = category;
        this.length = length;
        this.weeks = weeks;
    }

    public String getTitle() {
        return title;
    }

    public String getGoal() {
        return goal;
    }

    public String getCategory() {
        return category;
    }
    public int getLength() {
        return length;
    }
    public HashMap<String, ArrayList<String>> getweeks() {
        return weeks;
    }    
}