如何在android的autocompletetextview中获取所选项目的ID

问题描述 投票：4回答：3

我正在从服务器检索用于autocompletetextview的值，正在获取用户名及其用户ID的列表，现在我想要的是当我从列表中选择任何用户名时我想要获取该用户名的用户ID。

请查看我的代码：

SearchFriendsAdapter.java

public class SearchFriendsAdapter extends ArrayAdapter<String> {

private ArrayList<SearchFriends> items;
public static SearchFriends searchFriends;
public static ArrayList<String> friends_id;

boolean iNetAvailable;
Context context = getContext();

public SearchFriendsAdapter(Activity context, String nameFilter) {
    super(context, R.layout.row_search_friend);
    items = new ArrayList<SearchFriends>();
}

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

@Override
public String getItem(int index) {

    return items.get(index).getFriend_name();

}

public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    if (v == null) {
        LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(R.layout.row_search_friend, null);
    }

    searchFriends = items.get(position);
    if (searchFriends != null) {

        TextView tv_friend_name = (TextView) v.findViewById(R.id.search_friend_txt_friend_name);
        TextView tv_friend_email = (TextView) v.findViewById(R.id.search_friend_txt_friend_email);
        SimpleDraweeView iv_friend_pic = (SimpleDraweeView)v.findViewById(R.id.search_friend_img_friend_pic);
        tv_friend_name.setText(searchFriends.getFriend_name());
        tv_friend_email.setText(searchFriends.getFriend_email_id());
        iv_friend_pic.setImageURI(Uri.parse(searchFriends.getFriend_profile_pic()));

    }
    return v;
}


@Override
public Filter getFilter() {
    Filter myFilter = new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults filterResults = new FilterResults();

            iNetAvailable = Utility.isNetworkAvaliable(context);
                    SearchFriendsAsyncTask sf = new SearchFriendsAsyncTask();
                    if (constraint != null) {
                        List<SearchFriends> new_suggestions = sf.getParseJsonWCF(context, constraint.toString());
                        items.clear();

                        items.addAll(new_suggestions);

                        filterResults.values = items;
                        filterResults.count = items.size();
                    }
                    return filterResults;
        }

        @Override
        protected void publishResults(CharSequence contraint,
                FilterResults results) {
            if (results != null && results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }
    };
    return myFilter;
}

}

SearchFriendsAsyncTask.java

 public class SearchFriendsAsyncTask {


public SearchFriendsAsyncTask() {
    super();
}

public List<SearchFriends> getParseJsonWCF(Context mContext, String sName){
    List<SearchFriends> ListData = new ArrayList<SearchFriends>();

    SearchFriendsModel searchFriendsModel = null;

    String webUrl = Constant.URL_SEARCH_FRIEND;

    try{
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
        nameValuePairs.add(new BasicNameValuePair(Constant.USER_ID, 
                Utility.getAppPrefString(mContext ,Constant.USER_ID)));
        nameValuePairs
                .add(new BasicNameValuePair("name", sName));

        String response = Utility.postRequest(webUrl, nameValuePairs);

        JSONObject jObject = new JSONObject(response);
        Log.v("SEARCH FRIENDS RESPONSE : ", jObject.toString());


        searchFriendsModel = (SearchFriendsModel) new Gson().fromJson(
                jObject.toString(), SearchFriendsModel.class);

    } catch (Exception e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    return searchFriendsModel.getFriends(); 


    }

}

SearchModel.java

public class SearchFriends {

String friend_user_id;
String friend_name;
String friend_email_id;
String friend_profile_pic;


public SearchFriends(String friend_user_id, String friend_name,
        String friend_email_id, String friend_profile_pic) {
    super();
    this.friend_user_id = friend_user_id;
    this.friend_name = friend_name;
    this.friend_email_id = friend_email_id;
    this.friend_profile_pic = friend_profile_pic;
}


public String getFriend_user_id() {
    return friend_user_id;
}
public void setFriend_user_id(String friend_user_id) {
    this.friend_user_id = friend_user_id;
}
public String getFriend_name() {
    return friend_name;
}
public void setFriend_name(String friend_name) {
    this.friend_name = friend_name;
}
public String getFriend_email_id() {
    return friend_email_id;
}
public void setFriend_email_id(String friend_email_id) {
    this.friend_email_id = friend_email_id;
}
public String getFriend_profile_pic() {
    return friend_profile_pic;
}
public void setFriend_profile_pic(String friend_profile_pic) {
    this.friend_profile_pic = friend_profile_pic;
}

}

SearchFriendsModel.java

public class SearchFriendsModel {

private String response;
private String message;
private List<SearchFriends> friends;


public String getResponse() {
    return response;
}
public void setResponse(String response) {
    this.response = response;
}
public String getMessage() {
    return message;
}
public void setMessage(String message) {
    this.message = message;
}
public List<SearchFriends> getFriends() {
    return friends;
}
public void setFriends(List<SearchFriends> friends) {
    this.friends = friends;
}

}

我在这里设置适配器

et_search.setAdapter(new SearchFriendsAdapter(this, et_search.getText().toString()));
    et_search.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View arg1, int position,
                long arg3) {
            // TODO Auto-generated method stub
            SearchFriendsAdapter adapter = ((SearchFriendsAdapter)
                    et_search.getAdapter());
            String friend_id = ((SearchFriends)adapter
                    .getItem(position)).getFriend_user_id();

        }
    });

当我尝试获取上面的user_id时，它给我错误“无法从字符串转换为SearchFriends”

请帮助我实现我想要的。预先感谢。

android autocompletetextview
3个回答
4
投票
您用于

et_search的适配器，使用ArrayList<SearchFriends>

并且您正在尝试获取

friend_id

，它是string或int，并且将其强制转换为SearchFriends，这是不可能的。如果您想要

SearchFriends

对象，则使用此对象SearchFriends object = (SearchFriends)adapter.getItem(position); 
对不起，我还没有检查您的适配器
这是您在此处返回字符串的错误，因此您无法获得
SearchFriends
@Override public String getItem(int index) { return items.get(index).getFriend_name(); } 
所以我会说这样做，你很好。
@Override
public SearchFriends getItem(int index) {
        return items.get(index);    
}
5
投票
在适配器中更改

@Override public SearchFriends getItem(int index) { return items.get(index); } et_search.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View arg1, int position, long arg3) { // TODO Auto-generated method stub SearchFriends freindPOJO= adapter .getItem(position); String friends_id = freindPOJO.getFriend_user_id() } });

0
投票
[Narendra Kumar的答案很好。

这是Kotlin版本的示例，针对[ID为AutoCompleteTextView的atvUser和基于ArrayAdapter对象的ArrayList的User：

atvUser.onItemClickListener = AdapterView.OnItemClickListener { parent, _, position, _ -> userId = (parent.getItemAtPosition(position) as User).id } 

我为此分配了适配器：
atvUser.setAdapter(arrayAdapter(myData.users))

它起作用是因为我在separated file中声明了扩展功能：
fun <T> Context.arrayAdapter(objects: List<T>): ArrayAdapter<T> {
    return ArrayAdapter(this, android.R.layout.simple_dropdown_item_1line, objects)
}

希望有帮助。
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