我有这个错误 java.lang.IndexOutOfBoundsException:

Question

我收到一个错误：java.lang.IndexOutOfBoundsException：索引：0，大小：0我遇到错误的部分在我的 if 语句中onBindViewHolder，下面是我的适配器：public class UserProgramWeekAdapter extends RecyclerView.Adapter<UserProgramWeekAdapter.ViewHolder>{    private Context context;    private ArrayList<ProgramTrackerWrapper> programTrackers;    public UserProgramWeekAdapter(Context context, ArrayList<ProgramTrackerWrapper> programTrackers) {        this.context = context;        this.programTrackers = programTrackers;    }    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_user_program_week_adapter, parent, false);        ViewHolder viewHolder = new ViewHolder(view);        return viewHolder;    }    @Override    public void onBindViewHolder(UserProgramWeekAdapter.ViewHolder holder, int position) {        holder.dayTxt.setText(programTrackers.get(position).getDay());        holder.numberofExercises.setText(programTrackers.get(position).getProgramTrackers().size()+ " exercises");        boolean isFinished = false;        for (int i = 0; i < programTrackers.size(); i++){        if ( programTrackers.get(position).getProgramTrackers().get(i).isProgramExerciseFinished()){                isFinished = true;            }        }        String statusTxt = isFinished || programTrackers.size() == 0 ? "Completed" : "Not Completed";        holder.exerciseCompleted.setText(statusTxt);    }    @Override    public int getItemCount() {        return programTrackers.size();    }    public class ViewHolder extends RecyclerView.ViewHolder {        TextView dayTxt, exerciseCompleted, numberofExercises;        public ViewHolder(View itemView) {            super(itemView);            dayTxt = itemView.findViewById(R.id.dayTxt);            exerciseCompleted = itemView.findViewById(R.id.exerciseCompleted);            numberofExercises = itemView.findViewById(R.id.numberofExercises);        }    }}

Answer 1

这看起来很可疑：

for (int i = 0; i < programTrackers.size(); i++){

  if ( programTrackers.get(position).getProgramTrackers().get(i).isProgramExerciseFinished()){

        isFinished = true;

    }

}

您检查programTrackers列表的大小，但不检查其子列表，因此i很容易指向不正确的索引：

final int sublistSize =  programTrackers.get(position).getProgramTrackers().size();

for (int i = 0; i < sublistSize; i++){

  if (programTrackers.get(position).getProgramTrackers().get(i).isProgramExerciseFinished()){

        isFinished = true;

    }

}