我已将 Activity 中的自定义 BaseAdapter 设置为:
llNoContactMessage = (LinearLayout) findViewById(R.id.llNoContacts);
listAdapter = new ContactsListAdapter(this, contactsList);
lvContactList = (ListView) findViewById(R.id.lvContactList);
lvContactList.setAdapter(listAdapter);
lvContactList.setOnItemClickListener(null);
还有我的适配器类:
public class ContactsListAdapter extends BaseAdapter {
private List<ContactsInfo> contactList;
private Context context;
public ContactsListAdapter(Context context, List<ContactsInfo> contactsList) {
this.context = context;
this.contactList = contactsList;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
final ContactsInfo contactsInfo = contactList.get(position);
if(view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.activity_contacts_item, parent, false);
ViewHolder vh = new ViewHolder();
vh.tvContactName = (TextView) view.findViewById(R.id.tvContactName);
vh.tvContactNumber = (TextView) view.findViewById(R.id.tvContactNumber);
vh.llRemoveContact = (LinearLayout) view.findViewById(R.id.llRemoveContact);
view.setTag(vh);
}
final ViewHolder holder = (ViewHolder) view.getTag();
holder.tvContactName.setText(contactsInfo.getContactName());
holder.tvContactNumber.setText(contactsInfo.getContactNumber());
holder.llRemoveContact.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
UIUtils.showRemoveContactAlert(context, contactsInfo);
if(UIUtils.contactRemoved) {
contactList.remove(contactsInfo);
setList(getContacts());
notifyDataSetChanged();
}
}
});
return view;
}
static class ViewHolder {
TextView tvContactNumber;
TextView tvContactName;
LinearLayout llRemoveContact;
}
@Override
public int getCount() {
return contactList.size();
}
@Override
public ContactsInfo getItem(int index) {
return contactList.get(index);
}
@Override
public long getItemId(int position) {
return getItem(position).get_id();
}
public void setList(List<ContactsInfo> list) {
contactList.clear();
contactList.addAll(list);
}
private List<ContactsInfo> getContacts() {
CrisisCallingDatabase crisisCallDB = new CrisisCallingDatabase(context);
return crisisCallDB.getContactsList();
}
}
从数据库中删除数据的方法是:
public static void showRemoveContactAlert(final Context context, final ContactsInfo contact) {
AlertDialog.Builder b = new AlertDialog.Builder(context);
b.setMessage("Remove Contact");
b.setCancelable(true);
b.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
CrisisCallingDatabase ccd = new CrisisCallingDatabase(context);
if(ccd.deletContact(contact.get_id())){
Toast.makeText(context, contact.getContactName() + " removed successfully.", Toast.LENGTH_SHORT).show();
contactRemoved = true;
} else {
Toast.makeText(context, "Remove contact failed.", Toast.LENGTH_SHORT).show();
contactRemoved = false;
}
CrisisCallingDatabase.closeDBConnections();
}
});
b.setNegativeButton("No", null);
b.show();
}
但是列表的视图不会从列表中删除该项目。但是,再次单击列表上的任何 UI 组件后,将重新加载列表,即删除的项目被删除。我不知道我在哪里做错了。任何帮助将不胜感激。