Question

我创建了一个列表视图但是当我删除一个元素时，它没有刷新。我试过了

 adapter.notifyDataSetChanged();

和

getListView().invalidateViews();

主要活动中的

：

case R.id.ordini:

                    Ordini O = new Ordini();
                    android.app.FragmentManager fragmentManager0 = getFragmentManager();
                    android.app.FragmentTransaction fragmentTransaction0 = fragmentManager0
                            .beginTransaction();

                    fragmentTransaction0.replace(R.id.frame, O);
                    fragmentTransaction0.commit();

Ordini.java

public class Ordini extends ListFragment implements AdapterView.OnItemClickListener {

int ArraySize;
CustomAdapterOrdini adapter;
private List<RowItemOrdini> rowItems;
Button SendButton;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    return inflater.inflate(R.layout.ordini, null, false);

}

@Override
public void onActivityCreated(Bundle savedInstanceState) {

    super.onActivityCreated(savedInstanceState);

    ArraySize = MainActivity.ArrayProdotto.size();
    SendButton = (Button) getActivity().findViewById(R.id.send_btn);

    rowItems = new ArrayList<RowItemOrdini>();

    for (int i = 0; i < ArraySize; i++) {
        RowItemOrdini items = new RowItemOrdini(
                MainActivity.ArrayProdotto.get(i),
                R.drawable.ic_delete_black_24dp,
                MainActivity.ArrayCode.get(i),
                MainActivity.ArrayPrezzo.get(i),
                MainActivity.ArrayColli.get(i),
                MainActivity.ArrayQuantita.get(i));

        rowItems.add(items);
    }

    adapter = new CustomAdapterOrdini(getActivity(), rowItems);
    setListAdapter(adapter);

    getListView().setOnItemClickListener(this);


    SendButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(getActivity(), "invio ordine in corso... ", Toast.LENGTH_SHORT)
                    .show();
            SendOrdine();
        }
    });
}
@Override
public void onResume(){
    super.onResume();
    adapter.notifyDataSetChanged();
    getListView().invalidateViews();
}

CustomAdapterOrdini

public class CustomAdapterOrdini extends BaseAdapter {

Context context;
List<RowItemOrdini> rowItem;

ImageView  Del;
TextView Colli, Prezzo, Quantita, Code, Product;




CustomAdapterOrdini(Context context, List<RowItemOrdini> rowItem) {
    this.context = context;
    this.rowItem = rowItem;

}

@Override
public int getCount() {

    return rowItem.size();
}

@Override
public Object getItem(int position) {

    return rowItem.get(position);
}

@Override
public long getItemId(int position) {

    return rowItem.indexOf(getItem(position));
}
@Override
public boolean  areAllItemsEnabled() {
    return false;
}

@Override
public boolean isEnabled(int position) {
    return false;
}




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

    if (convertView == null) {
        LayoutInflater mInflater = (LayoutInflater) context
                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        convertView = mInflater.inflate(R.layout.list_ordini, null);
    }
    Code = (TextView) convertView.findViewById(R.id.prodcode);
    Product = (TextView) convertView.findViewById(R.id.PRODOTTO);
    Del = (ImageView) convertView.findViewById(R.id.del);

    Colli = (TextView) convertView.findViewById(R.id.T1);
    Prezzo = (TextView) convertView.findViewById(R.id.T2);
    Quantita = (TextView) convertView.findViewById(R.id.T3);


    Del.setFocusable(true);
    Del.setClickable(true);

    Del.setTag(convertView);

    final RowItemOrdini row_pos = rowItem.get(position);
    // setting the image resource and title
    Del.setImageResource(R.drawable.ic_delete_black_24dp);
    Product.setText(row_pos.getTitle());
    Code.setText(row_pos.getCode());

    Colli.setText(row_pos.getColli());
    Prezzo.setText(row_pos.getPrezzo());
    Quantita.setText(row_pos.getQuantita());

    Del.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            // HERE I WANT REFRESH MY LISTVIEW

            MainActivity.ArrayQuantita.remove(0);
            MainActivity.ArrayCode.remove(0);
            MainActivity.ArrayProdotto.remove(0);
            MainActivity.ArrayColli.remove(0);
            MainActivity.ArrayPrezzo.remove(0);

            CustomAdapter.ShowDialog("Elemento eliminato con successo!", context);

        }
    });

    return convertView;

}

有人可以帮我查看listview吗？我想在CustomAdapterOrdini或Ordini.java中的onResume上刷新我的listview。

public void onClick(View v) {

                // HERE I WANT REFRESH MY LISTVIEW

有一种简单的方法吗？非常感谢你！

Answer 1

您已在ArrayProdotto中声明MainActivity，并且您会在rowItem的{{1}}中显示您的数据。您必须从两个列表中删除数据并致电CustomAdapterOrdini

如下面的代码。

notifyDataSetChanged();

Answer 2

1）。从适配器中删除您的项目：

adapter.remove(adapter.getItem(position));

2）。致电adapter.notifyDataSetChanged();

每次从适配器删除项目时都应该调用notifyDataSetChanged()。不仅在onResume。

请注意，您应该从适配器中删除项目，更改ListView项目，而不是存储空间（ArrayList，SQLite或其他）。

删除元素后如何刷新ListView？

2 个答案: