アダプタで設定したときにチェックボックスがオフになっています

Question

カスタムアダプタから呼び出すときに自分のチェックボックスが有効でない理由がわかりません。

コンテキスト：私はRecyclerViewを持っています、リサイクラビューの各アイテムはイメージ、テキスト、およびチェックボックスを保持します。リストの各項目はFriendオブジェクトに対応し、これらのFriendオブジェクトのいくつかを選択できます。

public class FriendSelectionAdapter extends RecyclerView.Adapter<FriendSelectionAdapter.FriendViewHolder> { 

    private final LayoutInflater inflater; 
    private List<Friend> friends; 
    private Context context; 
    private final OnItemClickListener listener; 
    private String TAG = "FriendSelectionAD"; 

    public interface OnItemClickListener { 
     void onItemClick(Friend friend); 
    } 

    public FriendSelectionAdapter(Context context, List<Friend> friends, OnItemClickListener listener) { 
     this.friends = friends; 
     this.context = context; 
     this.listener = listener; 
     this.inflater = LayoutInflater.from(context); 
    } 

    @Override 
    public FriendViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     final View itemView = inflater.inflate(R.layout.list_item_friend,parent,false); 
     return new FriendViewHolder(itemView); 
    } 

    @Override 
    public void onBindViewHolder(FriendViewHolder holder, int position) { 
     final Friend friend = friends.get(position); 
     holder.bind(friend, listener); 
     holder.checkbox.setChecked(true); 
    } 

    @Override 
    public int getItemCount() { 
     return friends.size(); 
    } 

    public void setFriends(List<Friend> friends) { 
     this.friends = new ArrayList<>(friends); 
    } 

    public Friend removeItem(int position) { 
     final Friend friend= friends.remove(position); 
     notifyItemRemoved(position); 
     return friend; 
    } 

    public void addItem(int position, Friend friend) { 
     friends.add(position, friend); 
     notifyItemInserted(position); 
    } 

    public void moveItem(int fromPosition, int toPosition) { 
     final Friend friend = friends.remove(fromPosition); 
     friends.add(toPosition, friend); 
     notifyItemMoved(fromPosition, toPosition); 
    } 

    public void animateTo(List<Friend> friends) { 
     applyAndAnimateRemovals(friends); 
     applyAndAnimateAdditions(friends); 
     applyAndAnimateMovedItems(friends); 
    } 

    private void applyAndAnimateRemovals(List<Friend> newFriends) { 
     for (int i = friends.size() - 1; i >= 0; i--) { 
      final Friend friend = friends.get(i); 
      if (!newFriends.contains(friend)) { 
       removeItem(i); 
      } 
     } 
    } 

    private void applyAndAnimateAdditions(List<Friend> newFriends) { 
     for (int i = 0, count = newFriends.size(); i < count; i++) { 
      final Friend friend = newFriends.get(i); 
      if (!friends.contains(friend)) { 
       addItem(i, friend); 
      } 
     } 
    } 

    private void applyAndAnimateMovedItems(List<Friend> newFriends) { 
     for (int toPosition = newFriends.size() - 1; toPosition >= 0; toPosition--) { 
      final Friend friend = newFriends.get(toPosition); 
      final int fromPosition = friends.indexOf(friend); 
      if (fromPosition >= 0 && fromPosition != toPosition) { 
       moveItem(fromPosition, toPosition); 
      } 
     } 
    } 

    public class FriendViewHolder extends RecyclerView.ViewHolder { 
     private TextView nameView; 
     private CircleImageView profilePicture; 
     private CheckBox checkbox; 

     public FriendViewHolder(View view) { 
      super(view); 
      this.nameView = (TextView)view.findViewById(R.id.item_friend_name); 
      this.profilePicture = (CircleImageView) view.findViewById(R.id.item_friend_profile_picture); 
      this.checkbox = (CheckBox) view.findViewById(R.id.item_friend_checkbox); 
     } 


     public void bind(final Friend friend, final OnItemClickListener listener) { 
      nameView.setText(friend.getDisplayName()); 
      String profileUrl = "https://graph.facebook.com/" + friend.getId() + "/picture?type=large"; 
      Picasso.with(FriendSelectionAdapter.this.context).load(profileUrl).into(profilePicture); 
      checkbox.setChecked(true); 
      checkbox.setSelected(true); 
      /* 
      initialCheck(friend); 

      itemView.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        itemClicked(friend); 
       } 
      }); 

      checkbox.setOncheckListener(new CheckBox.OnCheckListener() { 
       @Override 
       public void onCheck(CheckBox checkbox, boolean b) { 
        itemClicked(friend); 
       } 
      }); 
      */ 

      Log.e(TAG,"Binding friend - name: " + friend.getDisplayName() + " selected: " + friend.isSelected()); 
     } 
     private void itemClicked(Friend friend) { 
      checkbox.setChecked(!friend.isSelected()); 
      friend.setSelected(!friend.isSelected()); 
     } 
     private void initialCheck(Friend friend) { 
      checkbox.setChecked(friend.isSelected()); 
     } 

    } 
} 

各項目は、次のようになります。

<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="48dp" 
    android:clickable="true" 
    android:paddingStart="16dp" 
    android:paddingEnd="16dp" 
    android:background="?attr/selectableItemBackground"> 

    <de.hdodenhof.circleimageview.CircleImageView 
     android:id="@+id/item_friend_profile_picture" 
     android:layout_width="40dp" 
     android:layout_height="40dp" 
     android:layout_gravity="center_vertical" 
     android:contentDescription="Facebook profile picture"/> 

    <TextView 
     android:id="@+id/item_friend_name" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:fontFamily="sans-serif" 
     android:layout_gravity="center_vertical" 
     android:paddingStart="72dp" 
     android:paddingEnd="0dp" 
     android:textSize="13sp" /> 

    <com.gc.materialdesign.views.CheckBox 
     android:id="@+id/item_friend_checkbox" 
     android:background="@color/colorAccent" 
     android:layout_gravity="end|center_vertical" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:drawablePadding="2dp" /> 

</FrameLayout> 

bindメソッドが呼び出されて、チェックボックスのためのUIが更新されない理由、それは混乱していますけれども。

ありがとうございます！

Answer 1

問題は、あなたのアダプタ

public class FriendViewHolder extends RecyclerView.Adapter<FriendViewHolder .MyViewHolder> { 

private ArrayList<Fr> arrayList = new ArrayList<>(); 

public class MyViewHolder extends RecyclerView.ViewHolder { 
    public TextView nameView; 
    public CircleImageView profilePicture; 
    public CheckBox checkbox; 

    public MyViewHolder(View view) { 
     super(view); 
     nameView = (TextView)view.findViewById(R.id.item_friend_name); 
     profilePicture = (CircleImageView) view.findViewById(R.id.item_friend_profile_picture); 
     checkbox = (CheckBox) view.findViewById(R.id.item_friend_checkbox); 
    } 
} 


public FriendViewHolder (ArrayList<ModelReviewOrder> modelReviewOrders) { 
    this.arrayList = modelReviewOrders; 
} 

@Override 
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    View itemView = LayoutInflater.from(parent.getContext()) 
      .inflate(R.layout.xml_of_each_row_of_list, parent, false); 

    return new MyViewHolder(itemView); 
} 

@Override 
public void onBindViewHolder(MyViewHolder holder, int position) { 
    ModelReviewOrder modelReviewOrder = arrayList.get(position); 
    holder.nameView.setText(friend.getDisplayName()); 
     String profileUrl = "https://graph.facebook.com/" + friend.getId() + "/picture?type=large"; 
     Picasso.with(FriendSelectionAdapter.this.context).load(profileUrl).into(holder.profilePicture); 
     holder.checkbox.setChecked(true); 
} 

@Override 
public int getItemCount() { 
    return arrayList.size(); 
} 

}である