Question

调用.notifyDataSetChanged（）时，我的适配器出现问题。它显示错误的项目

问题：

我在ArrayList中保存了3个项目：项目1，项目2和项目3.当我使用.remove(Index)删除项目1时，项目1被删除，但在调用{{1}之后我的notifyDataSetChanged()显示：第1项和第2项，最后一项未显示，即使我的ListView仅包含第2项和第3项。

下面的代码和输出：

ArrayList

删除前记录输出：

public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {


                final int indexToDelete = i;
                Log.i("indexToDelete", Integer.toString(i));
                for (int ji = 0; ji < items.size(); ji ++ ) {

                    Log.i("ItemInside",items.get(ji).getItemName());

                }

                AlertDialog.Builder builder = new AlertDialog.Builder(UserSimplePlusNoteActivity.this);
                builder.setTitle("Do you want to delete this note?");
                builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {

                        final Item toDelete = items.get(indexToDelete);
                        String noteToDelete = toDelete.getItemName();

                        items.remove(indexToDelete);
                        for (int ji = 0; ji < items.size(); ji ++ ) {

                            Log.i("ItemInside2",items.get(ji).getItemName());

                        }
                        customAdapter.notifyDataSetChanged();

删除后：

03-29 14:00:19.118 23457-23457/com.example.user.testingapp I/indexToDelete: 0
03-29 13:47:08.202 22165-22165/com.example.user.testingapp I/ItemInside: Test 1
03-29 13:47:08.202 22165-22165/com.example.user.testingapp I/ItemInside: Test 2 
03-29 13:47:08.202 22165-22165/com.example.user.testingapp I/ItemInside: Test 3

App screen is showing this

这是我的适配器和项目：

03-29 13:47:08.202 22165-22165/com.example.user.testingapp I/ItemInside: Test 2 
03-29 13:47:08.202 22165-22165/com.example.user.testingapp I/ItemInside: Test 3

档案：

public class CustomAdapter extends BaseAdapter {
    private Context context;
    private ArrayList<Item> items;

    public CustomAdapter(Context context, ArrayList<Item> items) {

        this.context = context;
        this.items = items;

    }

    @Override
    public int getCount() {
        return items.size();
    }

    @Override
    public Object getItem(int i) {
        return items.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

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

        if(view == null) {

            view = LayoutInflater.from(context).inflate(R.layout.custom_adapter, parent, false);

            Item currentItem = (Item) getItem(position);

            TextView textViewItemName = view.findViewById(R.id.titleID);
            TextView textViewItemDescription = view.findViewById(R.id.detailID);
            ImageView imageView = view.findViewById(R.id.imgID);

            textViewItemName.setText(currentItem.getItemName());
            textViewItemDescription.setText(currentItem.getItemDescription());
            switch (currentItem.getPriority()) {

                case 1:
                    break;
                case 2:
                    imageView.setImageResource(R.drawable.priority_urgent_icon);
                    break;
                case 3:
                    imageView.setImageResource(R.drawable.priority_important_icon);
                    break;
                    default:
                        Log.i("Ok", "Something strange happend");


            }

        }

        return view;
    }
}

Answer 1

在这种情况下似乎notifyDataSetChanged()没有正确刷新。使用新customAdapter刷新items并将其设置为listView，但notifyDataSetChanged()之前的这两行仍然可以解决问题：

customAdapter = new CustomAdapter(getApplicationContext(), items);
listView.setAdapter(customAdapter);

自定义适配器显示错误的项

1 个答案: