领域中的ArrayIndexOutOfBoundException

Question

public class ExpenseAdapter extends RealmRecyclerViewAdapater<Expense> {

final Context context;
private Realm realm;
private LayoutInflater inflater;

public ExpenseAdapter(Context context) {
    this.context = context;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    // inflate a new card view
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.expense_recycler_view, parent, false);
    // view.setOnCreateContextMenuListener(this);
    return new CardViewHolder(view);
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, final int position) {

    realm = RealmController.getInstance().getRealm();

    final Expense expense = getItem(position);
    final Tour tour = new Tour();
    final CardViewHolder holder = (CardViewHolder) viewHolder;
    String s = "";

    RealmResults<Tour> r = realm.where(Tour.class).findAll();
    realm.beginTransaction();
    s = r.get(position).getEventId();
    realm.commitTransaction();


    holder.textExpense.setText(expense.getAmount() + " E: " + expense.getEventId());
    holder.textDescription.setText(expense.getDescription() + " T: " + s);

    holder.card.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View content = inflater.inflate(R.layout.activity_add_new_expense, null);
            final EditText editAmount = (EditText) content.findViewById(R.id.edtxt_expense);
            final EditText editDescription = (EditText) content.findViewById(R.id.edtxt_description);

            editAmount.setText(expense.getAmount());
            editDescription.setText(expense.getDescription());

            AlertDialog.Builder builder = new AlertDialog.Builder(context);
            builder.setView(content)
                    .setTitle("Edit Event")
                    .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                            RealmResults<Expense> results = realm.where(Expense.class).findAll();

                            realm.beginTransaction();
                            results.get(position).setAmount(editAmount.getText().toString());
                            results.get(position).setDescription(editDescription.getText().toString());

                            realm.commitTransaction();

                            notifyDataSetChanged();
                        }
                    })
                    .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });
            AlertDialog dialog = builder.create();
            dialog.show();
        }
    });

}

@Override
public int getItemCount() {
    if (getRealmAdapter() != null) {
        return getRealmAdapter().getCount();
    }
    return 0;
}

public static class CardViewHolder extends RecyclerView.ViewHolder {

    public CardView card;
    public TextView textExpense;
    public TextView textDescription;

    public CardViewHolder(View itemView) {
        // standard view holder pattern with Butterknife view injection
        super(itemView);

        card = (CardView) itemView.findViewById(R.id.card_expense);
        textExpense = (TextView) itemView.findViewById(R.id.text_amount);
        textDescription = (TextView) itemView.findViewById(R.id.text_description);
    }

}
}

提前致谢！！！

Answer 1

这就是为什么：

RealmResults<Expense> results = realm.where(Expense.class).findAll();
realm.beginTransaction();
results.get(position).setAmount(editAmount.getText().toString());
results.get(position).setDescription(editDescription.getText().toString());
realm.commitTransaction();
notifyDataSetChanged(); // <--------- this causes the crash

问题：

1.）如果您在事务中操作结果集，那么您应该在事务中执行查询

realm.beginTransaction();
RealmResults<Expense> results = realm.where(Expense.class).findAll();

Expense expense = results.get(position);
expense.setAmount(editAmount.getText().toString());
expense.setDescription(editDescription.getText().toString());

那个指南是过时的垃圾，我推荐使用我的：

如何像一个冠军一样使用Android领域，以及如何判断自己是否做错了

以及相应的源示例。