Daten werden nicht mit FirebaseRecyclerAdapter geladen?

Question

Ich versuche, die Daten in das RV zu füllen. Wenn ich es mit einem benutzerdefinierten Adapter (traditioneller Adapter für RV) mache. Die Daten werden aufgefüllt. Aber ich möchte die FirebaseRecyclerAdapter verwenden. Damit kann ich etwas vom Boiler-Plate-Code reduzieren. während der Implementierung bekomme ich Failed to bounce to type Fehler.

JSON Von Firebase

{ 
    "subscriptions" : { 
    "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" ] 
     } 
     } 
    } 
    } 
} 

Program.java

public class Program { 
    private String title; 

    private String goal; 

    private String category; 

    private int length; 

    HashMap<String, ArrayList<String>> weeks; 

    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; 
    }  
} 

Fragment-Code

@Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 

     View v = inflater.inflate(R.layout.fragment_latest, container, false); 

     mRecyclerView = (RecyclerView) v.findViewById(R.id.recycler_view); 
     mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); 

     mAdapter = new FirebaseRecyclerAdapter<Program, ProgramVH>(Program.class, R.layout.program_item, ProgramVH.class, mRef) { 
      @Override 
      public void populateViewHolder(final ProgramVH programViewHolder, Program mProgram, int position) { 
       programViewHolder.setName(program.getTitle()); 
       programViewHolder.level.setText(program.getLength()); 

      } 
     }; 
     mRecyclerView.setAdapter(mAdapter); 
     FetchData(); 
     return v; 
    } 

public void FetchData(){ 

     mRef.addListenerForSingleValueEvent(new ValueEventListener() { 
      @Override 
      public void onDataChange(DataSnapshot dataSnapshot) { 
       if (dataSnapshot.exists()) { 
        for (DataSnapshot userSnapshot : dataSnapshot.getChildren()) { 
         for (DataSnapshot programSnapshot : userSnapshot.getChildren()) { 
          program = programSnapshot.getValue(Program.class); 
          Log.e("VH", program.getTitle()); // Title is getting printed 
         } 
        } 
       } 
       mAdapter.notifyDataSetChanged(); 
      } 

      @Override 
      public void onCancelled(FirebaseError firebaseError) { 
      } 
     }); 

    } 

    @Override 
    public void onDestroyView() { 
     super.onDestroyView(); 
     mAdapter.cleanup(); 
    }  

ViewHolder

public static class ProgramVH extends RecyclerView.ViewHolder { 
     protected ImageView header; 
     protected TextView title; 
     protected TextView level; 

     public ProgramVH(View view) { 
      super(view); 
      this.header = (ImageView) view.findViewById(R.id.coverImage); 
      this.title = (TextView) view.findViewById(R.id.title); 
      this.level = (TextView) view.findViewById(R.id.level); 
     } 

     public void setName(String name) { 
      title.setText(name); 
     } 
    } 

STACK TRACE

08: 55: 19,045 5717-5717/com.android.sam E/VH: Nachmittag Hiit 03-30 August: 55: 19,045 5717 -5717/com.android.sam D/AndroidRuntime: Ausschalten VM03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: FATALE AUSNAHME: Haupt 03-30 08: 55: 19.045 5717- 5717/com.android.sam E/AndroidRuntime: FATALE AUSNAHME: Haupt 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime : Prozess: com.android.sam, PID: 5717 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: com.firebase.client.FirebaseException: konnte nicht auf Typ 03 - springen 30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: um com.firebase.client.DataSnapshot.getValue (DataSnapshot.java:185) 03-30 08: 55: 19.045 5717-5717/com .android.sam E/AndroidRuntime: bei com.firebase.ui.FirebaseRecyclerAdapter.parseSnapshot (FirebaseRecyclerAdapter.java:161) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: at com. Firebase.UI.FirebaseRecyclerAdapter.getItem (FirebaseRecyclerAdapter.java:150) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: um com.firebase.ui.FirebaseRecyclerAdapter.onBindViewHolder (FirebaseRecyclerAdapter.java : 190) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/An droidRuntime: bei android.support.v7.widget.RecyclerView $ Adapter.onBindViewHolder (RecyclerView.java:5465) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support. v7.widget.RecyclerView $ Adapter.bindViewHolder (RecyclerView.java:5498) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.v7.widget.RecyclerView $ Recycler .getViewForPosition (RecyclerView.java:4735) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition (RecyclerView.java: 4611) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.v7.widget.LinearLayoutManager $ LayoutState.next (LinearLayoutManager.java:1988) 03-30 08 : 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.v7.widget.LinearLayou tManager.layoutChunk (LinearLayoutManager.java:1384) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.v7.widget.LinearLayoutManager.fill (LinearLayoutManager.java:1347) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.v7.widget.LinearLayoutManager.onLayoutChildren (LinearLayoutManager.java:574) 03-30 08:55: 19.045 5717-5717/com.android.sam E/Android Runtime: bei android.support.v7.widget.RecyclerView.dispatchLayoutStep2 (RecyclerView.java:3026) AUGUST 03-30: 55: 19,045 5717-5717/com.android.sam E/Android Runtime: bei android.support .v7.widget.RecyclerView.dispatchLayout (RecyclerView.java:2903) August 03-30: 55: 19,045 5717-5717/com.android.sam E/Android Runtime: bei android.support.v7.widget.RecyclerView.onLayout (RecyclerView.java:3277) 03-30 08: 55: 19,045 5717-5717/com.android.sam E/Android Runtime: bei android.view.View.layout (View.java:15686) 30.03 08.55 : 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view.ViewGroup.layout (ViewGroup.java:5039) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.design.widget.CoordinatorLayout.layoutChild (KoordinatorLayout.java:1087) 03-30 08: 55: 19.045 5717-5717/com .android.sam E/AndroidRuntime: bei android.support.design.widget.CoordinatorLayout.onLayoutChild (KoordinatorLayout.java:797) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: um android.support.design.widget.ViewOffsetBehavior.layoutChild (ViewOffsetBehavior.java:63) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.design.widget.HeaderScrollingViewBehavior .layoutChild (HeaderScrollingViewBehavior.java:126) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.design.widget.ViewOffsetBehavior.onLayoutChild (ViewOffsetBehavior.java:42) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.design.widget.AppBarLayout $ ScrollingViewBehavior.onLayoutChild (AppBarLayout.java:1139) 03-30 08:55 : 19.045 5717-5717/com.android.sam E/AndroidRu ntime: at android.support.design.widget.CoordinatorLayout.onLayout (KoordinatorLayout.java:810) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view.View. Layout (View.java:15686) August 03-30: 55: 19,045 5.717-5.717/com.android.sam E/Android Runtime: bei android.view.ViewGroup.layout (ViewGroup.java:5039) 03-30 August : 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.v4.view.ViewPager.onLayout (ViewPager.java:1684) 03-30 08: 55: 19.045 5717-5717/com .android.sam E/AndroidRuntime: bei android.view.View.layout (View.java:15686) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view. ViewGroup.layout (ViewGroup.java:5039) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.design.widget.HeaderScrollingViewBehavior.la youtChild (HeaderScrollingViewBehavior.java:122) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.design.widget.ViewOffsetBehavior.onLayoutChild (ViewOffsetBehavior.java:42) 03-30 08: 55: 19,045 5717-5717/com.android.sam E/Android Runtime: bei android.support.design.widget.AppBarLayout $ ScrollingViewBehavior.onLayoutChild (AppBarLayout.java:1139) 30.03 8.55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.design.widget.CoordinatorLayout.onLayout (KoordinatorLayout.java:810) 03-30 08: 55: 19.045 5717-5717/com.android. sam E/AndroidRuntime: bei android.view.View.layout (View.java:15686) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view.ViewGroup.layout (ViewGroup.java:5039) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/Androi dRuntime: bei android.widget.FrameLayout.layoutChildren (FrameLayout.java:579) August 03-30: 55: 19,045 5717-5717/com.android.sam E/Android Runtime: bei android.widget.FrameLayout.onLayout (FrameLayout. java: 514) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view.View.layout (View.java:15686) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view.ViewGroup.layout (ViewGroup.java:5039) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.widget.RelativeLayout.onLayout (RelativeLayout.java:1077) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view.View.layout (View.java: 15686) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view.ViewGroup.layout (ViewGroup.Java: 5039) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.support.v4.widget.DrawerLayout.onLayout (DrawerLayout.java:1183) 03-30 08 : 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view.View.layout (View.java:15686) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view.ViewGroup.layout (ViewGroup.java:5039) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.widget.FrameLayout.layoutChildren (FrameLayout.java:579) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.widget.FrameLayout.onLayout (FrameLayout.java:514) 03-30 08:55 : 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.view.View.layout (View.java:15686) 03-30 08: 55: 19.045 5717-5717/com.a ndroid.sam E/AndroidRuntime: bei android.view.ViewGroup.layout (ViewGroup.java:5039) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.widget.LinearLayout .setChildFrame (LinearLayout.java:1703) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.widget.LinearLayout.layoutVertical (LinearLayout.java:1557) 03-30 08: 55: 19.045 5717-5717/com.android.sam E/AndroidRuntime: bei android.widget.LinearLayout.onLayout (LinearLayout.java:1466) 03-30 08: 55: 19.045 5717-5717/com.android. sam E/Android Runtime: bei android.view.View

UPDATE

Die Daten gefüllt wird immer, wenn ich die folgenden ref

Firebase mRef = new Firebase("https://arulnadhan.firebaseio.com/").child("subscriptions/obama@gmsil,com"); 

verwenden, aber es funktioniert nicht, wenn ich die unten verwenden ref & der FetchData() Methode!

Firebase mRef = new Firebase("https://arulnadhan.firebaseio.com/subscriptions"); 

public void FetchData(){ 

     mRef.addListenerForSingleValueEvent(new ValueEventListener() { 
      @Override 
      public void onDataChange(DataSnapshot dataSnapshot) { 
       if (dataSnapshot.exists()) { 
        for (DataSnapshot userSnapshot : dataSnapshot.getChildren()) { 
         for (DataSnapshot programSnapshot : userSnapshot.getChildren()) { 
          program = programSnapshot.getValue(Program.class); 
          Log.e("VH", program.getTitle()); // Title is getting printed 
         } 
        } 
       } 
       mAdapter.notifyDataSetChanged(); 
      } 

      @Override 
      public void onCancelled(FirebaseError firebaseError) { 
      } 
     }); 
    } 

** JSON unter Abonnements Knoten **

{ 
    "arulndhan@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" ] 
     } 
    } 
    } 
} 

Answer 1

Ich bin nicht sicher, was Ihr mRef Variable bezieht sich auf, aber das ist alles, was ich brauche:

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    RecyclerView view = new RecyclerView(this); 
    setContentView(view); 

    view.setLayoutManager(new LinearLayoutManager(this)); 

    Firebase.setAndroidContext(this); 
    Firebase ref = new Firebase("https://stackoverflow.firebaseio.com/36299197").child("subscriptions/obama@gmsil,com"); 

    FirebaseRecyclerAdapter<Program, ProgramVH> adapter = new FirebaseRecyclerAdapter<Program, ProgramVH>(Program.class, android.R.layout.two_line_list_item, ProgramVH.class, ref) { 
     @Override 
     public void populateViewHolder(final ProgramVH programViewHolder, Program program, int position) { 
      System.out.println("populateViewHolder for position "+position+" with program "+program); 
      programViewHolder.title.setText(program.getTitle()); 
      programViewHolder.level.setText(""+program.getLength()); // coerce to string to prevent android.content.res.Resources$NotFoundException 
     } 
    }; 
    view.setAdapter(adapter); 
} 

Seit Ich benutze ein Lager Layout, ich änderte die Ansicht Halter ein wenig zu:

public static class ProgramVH extends RecyclerView.ViewHolder { 
    protected TextView title; 
    protected TextView level; 

    public ProgramVH(View view) { 
     super(view); 
     this.title = (TextView) view.findViewById(android.R.id.text1); 
     this.level = (TextView) view.findViewById(android.R.id.text2); 
    } 
} 

Ich habe eine Activity36299197 zu meinem sample repo dafür hinzugefügt. Wenn Sie die App starten und die Activity36299197 aus der ursprünglichen Liste auswählen, werden die Daten aus dem von Ihnen geposteten JSON angezeigt.