Android:IndexOutOfBounds在ListView中删除行时出错

我有一个有2个屏幕的应用程序。 第一个屏幕具有电影的ListView,其中一行由在strings.xml中声明的3个元素组成:标题,日期和总值。 用户可以通过点击菜单按钮来添加电影,该菜单按钮将其发送到另一个屏幕。 第二个屏幕有3个编辑文本对应于标题日期和总量,当它返回到屏幕1时,它按字母顺序排序。

同样,用户也可以通过长按一个上下文菜单的行来编辑/删除条目。 编辑功能像这样工作:

a。)用户长按泰坦尼克号并选择编辑b。)行被删除,用户进入屏幕2 c。)编辑文本由删除的行d中的初始数据填充。)当用户编辑数据时,新电影是添加在ListView的底部。

当用户在ListView的底部删除这部新电影时,就会出现问题。 Logcat给出了一个

   java.lang.IndexOutOfBoundsException: Invalid index 50, size is 50

这里是我的代码(注意我使用Perst来保存数据,但我不认为这对我的问题无关紧要):

       case R.id.contextedit:
            Lab9_082588FetchDetails row = (Lab9_082588FetchDetails)    getListView()
                    .getItemAtPosition(info.position);
            Intent editData = new Intent(MovieList.this,    Lab9_082588Edit.class);
        String startTitle = row.getTitle();
        String startGross = row.getGross();
        String startDate = row.getDate();

        editData.putExtra(Lab9_082588Edit.TITLE_STRING, startTitle);
        editData.putExtra(Lab9_082588Edit.GROSS_STRING, startGross);
        editData.putExtra(Lab9_082588Edit.DATE_STRING, startDate);
        startActivityForResult(editData, MovieList.EDIT_MOVIE);

        int posEdit = info.position;
        String editTitle = results.get(info.position).getTitle();
        results.remove(posEdit);
        adapter.notifyDataSetChanged();

                    //Perst
        Index<Lab9_082588FetchDetails> rootEdit = (Index<Lab9_082588FetchDetails>) db
                .getRoot();
        rootEdit.remove(editTitle, results.get((int) info.id));
        db.setRoot(rootEdit);

        return true;

编辑类:

       @Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle item selection using item.getItemId()
    switch (item.getItemId()) {
    case R.id.edit:
        next();
        break;
    }
    return true;
}

private void next() {
    // TODO Auto-generated method stub
    EditText movieTitle = (EditText) findViewById(R.id.etTitle);
    EditText movieGross = (EditText) findViewById(R.id.etGross);
    EditText movieDate = (EditText) findViewById(R.id.etDate);

    String title = movieTitle.getText().toString();
    String gross = movieGross.getText().toString();
    String date = movieDate.getText().toString();

    if ((title.length() > 0) && (gross.length() > 0)
            && (date.length() == 4)) {

        Intent hobby = getIntent();
        hobby.putExtra(Lab9_082588Edit.TITLE_STRING, title);
        hobby.putExtra(Lab9_082588Edit.GROSS_STRING, gross);
        hobby.putExtra(Lab9_082588Edit.DATE_STRING, date);
        setResult(RESULT_OK, hobby);
        finish();
    }
}

删除功能:

             int posDelete = info.position;
                                String deleteTitle = results.get(
                                        info.position).getTitle();
                                results.remove(posDelete);
                                adapter.notifyDataSetChanged();

                                  Index<Lab9_082588FetchDetails> rootDelete = (Index<Lab9_082588FetchDetails>) db
                                        .getRoot();
                                rootDelete.remove(deleteTitle,
                                        results.get(info.position));
                                db.setRoot(rootDelete); //Perst

                                return;

OnActivityResult(编辑):

         case EDIT_MOVIE:
            Lab9_082588FetchDetails edittedMovie = new Lab9_082588FetchDetails();
            NumberFormat formatterEdit = new DecimalFormat("###,###,###");

            edittedMovie.setTitle(data
                    .getStringExtra(Lab9_082588Add.TITLE_STRING));
            edittedMovie.setGross("$"
                    + formatterEdit.format(Double.parseDouble(data
                            .getStringExtra(Lab9_082588Add.GROSS_STRING))));
            edittedMovie.setDate(data
                    .getStringExtra(Lab9_082588Add.DATE_STRING));

            results.add(edittedMovie);
            adapter.notifyDataSetChanged();

填充Listview:

  for (int i = 0; i < items.size(); i++) {
        Lab9_082588FetchDetails sr = new Lab9_082588FetchDetails();
        sr.setTitle(items.get(i).getTitle());
        sr.setGross(items.get(i).getGross());
        sr.setDate(items.get(i).getDate());
        results.add(sr);
        Collections.sort(results, ignoreCaseStart);
    }

我该如何补救?


发生此问题是因为在删除函数中,首先从结果集合中删除元素(“results.remove(posDelete);”),然后几行后,将“results.get(info.position)”为rootDelete.remove调用获取一个参数,但该参数已被删除。

如果元素是集合的最后一个元素,让我们说第50个元素,“info.position”的值是50.您删除一个元素,所以元素的数量现在是49.在您调用的rootDelete.remove行中results.get(50),它会产生错误。

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