Impossible d'afficher Toast

Question

Comment afficher roomId dans Toast?

Dans mon code (MainActivity) ci-dessous, je suis incapable de montrer un toast:

package com.android.listviewexample; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 
import com.android.volley.AuthFailureError; 
import com.android.volley.Request; 
import com.android.volley.RequestQueue; 
import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.toolbox.StringRequest; 
import com.android.volley.toolbox.Volley; 
import android.support.v7.app.ActionBarActivity; 
import android.view.View; 
import android.view.Window; 
import android.content.Intent; 
import android.os.Bundle; 
import android.widget.ListView; 
import android.widget.AdapterView; 
import android.widget.SimpleAdapter; 
import android.widget.Toast; 
import android.widget.AdapterView.OnItemClickListener; 
public class MainActivity extends ActionBarActivity { 

    private RequestQueue requestQueue; 
    private static final String URL = "http://192.168.0.1/api/enter.php"; 
    private StringRequest request; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    this.requestWindowFeature(Window.FEATURE_NO_TITLE); 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    requestQueue = Volley.newRequestQueue(this); 
    request = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() { 
    @Override 
    public void onResponse(String response) { 
    try { 
    JSONObject jsonObject = new JSONObject(response); 
    if(jsonObject.names().get(0).equals("success")){ 

    JSONArray success = jsonObject.getJSONArray("success"); 
    for (int i = 0; i < success.length(); i++) { 
    JSONObject succes = success.getJSONObject(i); 
    System.out.println(succes.toString()); 
    }  
    JSONArray rooms = jsonObject.getJSONArray("rooms"); 
    for (int i = 0; i < rooms.length(); i++) { 
    JSONObject room = rooms.getJSONObject(i); 
    String name = room.optString("room"); 
    String roomid = room.optString("roomid"); 
    String outPut = name; 
    roomList.add(createRoom("chatroom", outPut));   

    ListView listView = (ListView) findViewById(R.id.examplelistView); 
    SimpleAdapter simpleAdapter = new SimpleAdapter(MainActivity.this, roomList, android.R.layout.simple_list_item_1, new String[] {"chatroom"}, new int[] {android.R.id.text1}); 
    listView.setAdapter(simpleAdapter); 
    listView.setOnItemClickListener(new OnItemClickListener() { 
    @Override 
    public void onItemClick(AdapterView<?> parent, View view, 
    int position, long id) { 

    Intent intent = new Intent(getApplicationContext(), FstActivity.class); 
    Bundle b = new Bundle(); 
    int itemPosition  = position; 
    b.putString("roomposition", "Position :"+itemPosition); 
    //b.putString("roomid", roomid.toString()); 
    intent.putExtras(b); 
    startActivity(intent); 
    Toast.makeText(getApplicationContext(),"Position :"+itemPosition, Toast.LENGTH_LONG) 
    .show(); 

    } 
    }); 
    }   

    }else { 

    } 
    } catch (JSONException e) { 
    e.printStackTrace(); 
    } 
    } 
    }, new Response.ErrorListener() { 
    @Override 
    public void onErrorResponse(VolleyError error) { 
    } 
    }){ 
    @Override 
    protected Map<String, String> getParams() throws AuthFailureError { 
    HashMap<String,String> hashMap = new HashMap<String, String>(); 
    hashMap.put("s","e0c93d9bb49efd89f9b70225bd65f157".toString()); 
    return hashMap; 
    } 
    }; 
    requestQueue.add(request);  

    } 
    List<Map<String,String>> roomList = new ArrayList<Map<String,String>>(); 
    private HashMap<String, String>createRoom(String name,String number){ 
    HashMap<String, String> roomName = new HashMap<String, String>(); 
    roomName.put(name, number); 
    return roomName;} 
    } 

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.android.listviewexample.MainActivity" > 

    <ListView 
     android:id="@+id/examplelistView" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentRight="true" > 

    </ListView> 

</RelativeLayout> 

192.168.0.1/enter.php

{"success":[{"sid":"e0c93d9bb49efd89f9b70225bd65f157","login":"saeed"}],"rooms":[{"roomid":"room12","room":".~=cAsiNo-RooM=~."},{"roomid":"room24","room":".~=MusiC-Masti=~."},{"roomid":"room29","room":".~"LoVeRs_RoOM"~."},{"roomid":"room30","room":".PunjaBi_RocK."},{"roomid":"room31","room":".~"FrienDs_RoOM"~."},{"roomid":"room33","room":".~"Party_All_NiGhT"~."},{"roomid":"room13","room":".~=HuNtEd-RooM=~."}]} 

Comment montrer Ro om Id dans Toast et OnItemClickListener.

Answer 1

d'abord ajouter les éléments de la liste en utilisant le code suivant:

list.add(model(name, roomid)); 

Créer aussi une classe de modèle pour RoomModel comme ceci:

public class RoomModel { 
    public String name, id, image, description; 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getId() { 
     return id; 
    } 

    public void setId(String id) { 
     this.id = id; 
    } 

}

et de créer un modèle votre classe d'activité comme ceci:

private RoomModel model(String id, String name) { 
     RoomModel m= new RoomModel(); 
     m.setId(id); 
     m.setName(name); 
     return m; 
    } 

maintenant en appel OnItemClickListener:

Toast.makeText(getApplicationContext(),roomlist.get(position).getId());, Toast.LENGTH_LONG) 
.show();