获取从api获取并添加到listview的字符串的值

Question

该应用程序包含一个列表视图，该列表视图从api填充，该API返回用户要完成的调查列表。列表视图显示id，类型和日期。 用户点击它并进入屏幕完成调查。

- 我要做的是存储获取并显示在列表视图行中的id，并将其传递给intent中的下一个屏幕。 这样，每当用户点击列表中的项目时，在自动完成调查时，id将被传递到下一个屏幕，并且数据将根据调查ID返回到api到正确的调查。我目前正在静态传递调查ID，因此只能完成一项调查。

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Net;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Newtonsoft.Json;

namespace Dribl.Droid
{
    [Activity(Label = "Surveys", Theme = "@style/CustomActionBarTheme")]
    public class Surveys : Activity
    {
        LinearLayout surveysBtn;
        LinearLayout availabilityBtn;
        LinearLayout inboxBtn;
        LinearLayout dashboardBtn;

        //Button backBtn;

        private List<String> surveys;
        private ListView surveyListview;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Surveys);
            //add the action bar to the layout 
            ActionBar.SetCustomView(Resource.Layout.action_bar);
            ActionBar.SetDisplayShowCustomEnabled(true);

            //action bar nav
            surveysBtn = FindViewById<LinearLayout>(Resource.Id.SurveyLayout);
            surveysBtn.Click += surveyBtn_Click;
            inboxBtn = FindViewById<LinearLayout>(Resource.Id.InboxLayout);
            inboxBtn.Click += InboxBtn_Click;
            availabilityBtn = FindViewById<LinearLayout>(Resource.Id.availabilityLayout);
            availabilityBtn.Click += availabilityBtn_Click;
            dashboardBtn = FindViewById<LinearLayout>(Resource.Id.dashboardLayout);
            dashboardBtn.Click += dashboardBtn_Click;
            surveyListview = FindViewById<ListView>(Resource.Id.surveyListView);
            surveyListview.ItemClick += SurveyListview_ItemClick;


            WebClient client = new WebClient();
            System.Uri uri = new System.Uri("http://dribl.com/api/getAllMySurveys");
            NameValueCollection parameters = new NameValueCollection();


            parameters.Add("token", GlobalVariables.token);

            client.UploadValuesAsync(uri, parameters);
            client.UploadValuesCompleted += client_UploadValuesCompleted;
        }


        //listview row click 
        String survey_ID;
        private void SurveyListview_ItemClick(object sender, AdapterView.ItemClickEventArgs e)
        {



            Intent intent = new Intent(this, typeof(muscleCondition));
            intent.PutExtra("survey_id", "1");
            StartActivity(intent); 
        }

        void client_UploadValuesCompleted(object sender, UploadValuesCompletedEventArgs e)
        {
            string json = Encoding.UTF8.GetString(e.Result);
            List<Survey> survey = JsonConvert.DeserializeObject<List<Survey>>(json);


            //get the list view create a string to store and add to the list view based on the json return
            surveyListview = FindViewById<ListView>(Resource.Id.surveyListView);
            surveys = new List<string>();

            for (int c = 0; c < survey.Count; c++)
            {
                //if (survey[c].survey != null)
                //idtxtview.text = survey[c].id + etc
                surveys.Add(survey[c].id + "." + " " + "[" + survey[c].type + "]" + " " + "Date: " + survey[c].created_at);
            }


            ArrayAdapter<string> adapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleListItem1, surveys);

            surveyListview.Adapter = adapter;


        }

        void surveyBtn_Click(object sender, EventArgs e)
        {
            Intent intent = new Intent(this, typeof(Surveys));
            this.StartActivity(intent);
            this.Finish();
        }

        void dashboardBtn_Click(object sender, EventArgs e)
        {
            Intent intent = new Intent(this, typeof(dashboard));
            this.StartActivity(intent);
            this.Finish();
        }

        void availabilityBtn_Click(object sender, EventArgs e)
        {
            Intent intent = new Intent(this, typeof(Availability));
            this.StartActivity(intent);
            this.Finish();
        }

        void InboxBtn_Click(object sender, EventArgs e)
        {
            Intent intent = new Intent(this, typeof(MsgInbox));
            this.StartActivity(intent);
            this.Finish();
        }


    }

    public class Survey
    {

        public int id { get; set; }
        public string type   { get; set; }
        public string created_at { get; set;}

    }

}

Answer 1

詹姆斯试试这段代码

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Net;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Newtonsoft.Json;

namespace Dribl.Droid
{
    [Activity(Label = "Surveys", Theme = "@style/CustomActionBarTheme")]
    public class Surveys : Activity
    {
        LinearLayout surveysBtn;
        LinearLayout availabilityBtn;
        LinearLayout inboxBtn;
        LinearLayout dashboardBtn;

        //Button backBtn;

        private List<String> surveys;
        private ListView surveyListview;
        private List<Survey> survey; // notice the survey list here
        private ArrayAdapter<string> adapter; // notice adapter here

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Surveys);
            //add the action bar to the layout 
            ActionBar.SetCustomView(Resource.Layout.action_bar);
            ActionBar.SetDisplayShowCustomEnabled(true);

            //action bar nav
            surveysBtn = FindViewById<LinearLayout>(Resource.Id.SurveyLayout);
            surveysBtn.Click += surveyBtn_Click;
            inboxBtn = FindViewById<LinearLayout>(Resource.Id.InboxLayout);
            inboxBtn.Click += InboxBtn_Click;
            availabilityBtn = FindViewById<LinearLayout>(Resource.Id.availabilityLayout);
            availabilityBtn.Click += availabilityBtn_Click;
            dashboardBtn = FindViewById<LinearLayout>(Resource.Id.dashboardLayout);
            dashboardBtn.Click += dashboardBtn_Click;
            surveyListview = FindViewById<ListView>(Resource.Id.surveyListView);
            surveyListview.ItemClick += SurveyListview_ItemClick;


            WebClient client = new WebClient();
            System.Uri uri = new System.Uri("http://dribl.com/api/getAllMySurveys");
            NameValueCollection parameters = new NameValueCollection();


            parameters.Add("token", GlobalVariables.token);

            client.UploadValuesAsync(uri, parameters);
            client.UploadValuesCompleted += client_UploadValuesCompleted;
        }

        //listview row click // notice we get the selected survey string here using click event arguments 
        String survey_ID;
        private void SurveyListview_ItemClick(object sender, AdapterView.ItemClickEventArgs e)
        {
             var selectedSurvey = survey.ElementAt(e.Position); // first approach or var selectedSurvey = survey[e.Position];
            //var selectedSurvey = adapter.GetItemAtPosition(e.Position); // second approach get selected survey string

            // do something with the selectedSurvey
            Intent intent = new Intent(this, typeof(muscleCondition));
            intent.PutExtra("survey_id", selectedSurvey.getId()); //pass survey id here
            StartActivity(intent); 
        }

        void client_UploadValuesCompleted(object sender, UploadValuesCompletedEventArgs e)
        {
            string json = Encoding.UTF8.GetString(e.Result);
            survey = JsonConvert.DeserializeObject<List<Survey>>(json);

            //get the list view create a string to store and add to the list view based on the json return
            surveyListview = FindViewById<ListView>(Resource.Id.surveyListView);
            surveys = new List<string>();

            for (int c = 0; c < survey.Count; c++)
            {                   
                surveys.Add(survey[c].id + "." + " " + "[" + survey[c].type + "]" + " " + "Date: " + survey[c].created_at);
            }

            adapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleListItem1, surveys);

            surveyListview.Adapter = adapter;
        }

        void surveyBtn_Click(object sender, EventArgs e)
        {
            Intent intent = new Intent(this, typeof(Surveys));
            this.StartActivity(intent);
            this.Finish();
        }

        void dashboardBtn_Click(object sender, EventArgs e)
        {
            Intent intent = new Intent(this, typeof(dashboard));
            this.StartActivity(intent);
            this.Finish();
        }

        void availabilityBtn_Click(object sender, EventArgs e)
        {
            Intent intent = new Intent(this, typeof(Availability));
            this.StartActivity(intent);
            this.Finish();
        }

        void InboxBtn_Click(object sender, EventArgs e)
        {
            Intent intent = new Intent(this, typeof(MsgInbox));
            this.StartActivity(intent);
            this.Finish();
        }
    }

    public class Survey
    {
        public int id { get; set; }
        public string type   { get; set; }
        public string created_at { get; set;}
    }
}