FirebaseListAdapterで結合クエリからデータをバインドするにはどうすればいいですか？

Question

FirebaseListAdapterを使用してListViewにデータを挿入しようとしています。 私は、データを結合するために、次のリスナーを追加しました：

mWODsReference.addChildEventListener(new ChildEventListener() { 
     @Override 
     public void onChildAdded(DataSnapshot dataSnapshot, String s) { 
      final String wod_key = dataSnapshot.getKey(); 
      System.out.println("The wod key is " + wod_key); 
      mDatabase.child("wod_rounds/" + wod_key).addValueEventListener(new ValueEventListener() { 
       @Override 
       public void onDataChange(DataSnapshot dataSnapshot) { 
        for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) { 
         modelWODRound post = postSnapshot.getValue(modelWODRound.class); 
         String round_key = postSnapshot.getKey(); 
         System.out.println("Round key and time cap are " + round_key + ": " + post.getRoundlimit().toString()); 
         DatabaseReference refRE = mDatabase.child("round_exercises").child(round_key); 
         refRE.addValueEventListener(new ValueEventListener() { 
          @Override 
          public void onDataChange(DataSnapshot dataSnapshot) { 
           for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) { 
            String exercise_key = postSnapshot.getKey(); 
            System.out.println("Round exercises are " + exercise_key); 
           } 
          } 

          @Override 
          public void onCancelled(DatabaseError databaseError) { 

          } 
         }); 

        } 
       } 

       @Override 
       public void onCancelled(DatabaseError databaseError) { 

       } 
      }); 
     } 

     @Override 
     public void onChildChanged(DataSnapshot dataSnapshot, String s) { 

     } 

     @Override 
     public void onChildRemoved(DataSnapshot dataSnapshot) { 

     } 

     @Override 
     public void onChildMoved(DataSnapshot dataSnapshot, String s) { 

     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 

     } 
    }); 

私はそれのprintlnは私に正しい値を示している見ることができます。 文字列round_keyとexercise_keyをandroid.R.layout.two_line_list_itemのフィールドにバインドするにはどうすればよいですか？

Answer 1

アダプタ用のカスタムクラスを作成します。

public class ListAdapter extends ArrayAdapter<CustomItem> { 

public ListAdapter(Context context, int textViewResourceId) { 
    super(context, textViewResourceId); 
} 

public ListAdapter(Context context, int resource, List<Item> items) { 
    super(context, resource, items); 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

    View v = convertView; 

    if (v == null) { 
     LayoutInflater vi; 
     vi = LayoutInflater.from(getContext()); 
     v = vi.inflate(R.layout.two_line_list_item, null); 
    } 

    CustomItem p = getItem(position); 
    if (p != null) { 
      TextView tt2 = (TextView) v.findViewById(R.id.round_key); 
      TextView tt3 = (TextView) v.findViewById(R.id.exercise_key); 


      if (tt2 != null) { 
       tt2.setText(p.getRoundKey()); 
      } 

      if (tt3 != null) { 
       tt3.setText(p.getExerciseKey()); 
      } 
     } 

     return v; 
    } 
} 

カスタムItemクラス：MainActivityで

public class CustomItem { 

    public String round_key; 
    public String exercuse_key; 

    public CustomItem() { 

    } 

    public CustomItem(String r_key, String e_key) 
    { 
     this.round_key=r_key; 
     this.exercise_key=e_key; 
    } 

    public String getRoundKey(){ 
     return this.round_key; 
    } 

    public String getExerciseKey(){ 
     return this.exercise_key; 
    } 
} 

：

private List<CustomItem> customItem; 
private ListAdapter adapter; 
private CustomItem mItem; 

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

    setContentView(R.layout.activity_main); 

    listView = (ListView)findViewById(R.id.listview1); 

    customItem = new ArrayList<CustomItem>(); 

    getFirebaseData(); 

    listView.setAdapter(adapter); 
} 

private void getFirebaseData(){ 
     mWODsReference.addChildEventListener(new ChildEventListener() { 
     @Override 
     public void onChildAdded(DataSnapshot dataSnapshot, String s) { 
      final String wod_key = dataSnapshot.getKey(); 
      System.out.println("The wod key is " + wod_key); 
      mDatabase.child("wod_rounds/" + wod_key).addValueEventListener(new ValueEventListener() { 
       @Override 
       public void onDataChange(DataSnapshot dataSnapshot) { 
        for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) { 
         modelWODRound post = postSnapshot.getValue(modelWODRound.class); 
         String round_key = postSnapshot.getKey(); 
         System.out.println("Round key and time cap are " + round_key + ": " + post.getRoundlimit().toString()); 
         DatabaseReference refRE = mDatabase.child("round_exercises").child(round_key); 
         refRE.addValueEventListener(new ValueEventListener() { 
          @Override 
          public void onDataChange(DataSnapshot dataSnapshot) { 
           for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) { 
            String exercise_key = postSnapshot.getKey(); 
            System.out.println("Round exercises are " + exercise_key); 
            mItem = new CustomItem(round_key,exercise_key); 
            customItem.add(mItem); 
            adapter.notifyDataSetChanged(); 
           } 
          } 

          @Override 
          public void onCancelled(DatabaseError databaseError) { 

          } 
         }); 

        } 
       } 

       @Override 
       public void onCancelled(DatabaseError databaseError) { 

       } 
      }); 
     } 

     @Override 
     public void onChildChanged(DataSnapshot dataSnapshot, String s) { 

     } 

     @Override 
     public void onChildRemoved(DataSnapshot dataSnapshot) { 

     } 

     @Override 
     public void onChildMoved(DataSnapshot dataSnapshot, String s) { 

     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 

     } 
    }); 
}