jsonクエリとphpでアンドロイドスピナーを設定

Question

私はphpMyAdminデータベースに保存したいくつかのデータ（別の場所の名前）をスピナーに挿入しようとしています。

主な活動は以下のとおりです。

package com.example.transgoods; 

import java.io.BufferedReader; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 
import java.util.List; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.app.Activity; 
import android.app.AlertDialog; 
import android.app.ProgressDialog; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemSelectedListener; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.Spinner; 
import android.widget.Toast; 

public class StartActivity extends Activity implements OnItemSelectedListener { 

    private Button btnPopulate, btnNext; 
    private Spinner pointSpinner; 

    private ArrayList<POI> POIList; 
    ProgressDialog pDialog; 

    private String url_list_poi ="http://10.0.2.2/listpoi.php"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_start); 

     Button btnNext = (Button) findViewById(R.id.btnStartNext); 
     Button btnPopulate = (Button) findViewById(R.id.btnPopulate); 

     final Intent endActivity= new Intent(this, EndActivity.class); 


     pointSpinner = (Spinner) findViewById(R.id.point_spinner); 

     POIList = new ArrayList<POI>(); 

     pointSpinner.setOnItemSelectedListener(this); 
     btnPopulate.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       new GetPOI().execute(); 

      } 
      /** async tast to get all poi 
      * 
      * @author pavloselp 
      * 
      */ 
      class GetPOI extends AsyncTask<Void, Void, Void>{ 

       protected void onPreExecute(){ 
        super.onPreExecute(); 
        pDialog = new ProgressDialog(StartActivity.this); 
        pDialog.setMessage("fetching poi list"); 
        pDialog.setCancelable(false); 
        pDialog.show(); 
       } 

       @Override 
       protected Void doInBackground(Void... arg0) { 
        // TODO Auto-generated method stub 
        ServiceHandler jsonParser = new ServiceHandler(); 
        String json = jsonParser.makeServiceCall(url_list_poi, ServiceHandler.GET); 

        Log.e("Response: ",">"+json); 

        if(json != null){ 
         try{ 
          JSONObject jsonObj = new JSONObject(json); 
          if (jsonObj != null){ 
           JSONArray poiArray = jsonObj.getJSONArray("POI"); 

           for(int i=0;i<poiArray.length();i++){ 
            JSONObject poiObj = (JSONObject) poiArray.get(i); 
            POI poi = new POI (poiObj.getInt("poiID"), poiObj.getString("poiName")); 
            POIList.add(poi); 
            Log.i("POI List is:", POIList.toString());} 
          } 
         }catch(JSONException e){ 
          e.printStackTrace(); 
         } 
        }else{ 
         Log.e("JSON data", "didnt receive any data from server!"); 
        } 

        return null; 
       } 

       @Override 
       protected void onPostExecute(Void result) { 
        super.onPostExecute(result); 
        if (pDialog.isShowing()) 
         pDialog.dismiss(); 
        populateSpinner(); 
       } 

       //adding spinner data 

       private void populateSpinner(){ 
        List<String> lables = new ArrayList<String>(); 

        for(int i = 0;i < POIList.size(); i++){ 
         lables.add(POIList.get(i).getName()); 
        } 

        //creating adapter for spinner 
        ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(StartActivity.this , android.R.layout.simple_spinner_item, lables); 
        spinnerAdapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
        pointSpinner.setAdapter(spinnerAdapter); 
       } 
      } 
     }); 
    } 

    @Override 
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
     // TODO Auto-generated method stub 
     Toast.makeText(
       getApplicationContext(), 
         parent.getItemAtPosition(position).toString() + " Selected" , 
       Toast.LENGTH_LONG).show(); 
    } 

    @Override 
    public void onNothingSelected(AdapterView<?> arg0) { 
     // TODO Auto-generated method stub 
    } 
} 

PHPファイル：

<?php 
$host="localhost"; //replace with database hostname 
$username="root"; //replace with database username 
$password="root"; //replace with database password 
$db_name="TransGoods"; //replace with database name 

$mysqli = new mysqli($host, $username, $password,$db_name); 
if (mysqli_connect_error()) { 
     printf("Connect failed: %s\n", mysqli_connect_error()); 
     exit(); 
     }  

     $mysqli->query("SET NAMES 'utf8'"); 
     $sql="SELECT poiID, poiName FROM POI"; 
     $result=$mysqli->query($sql); 
     while($e=mysqli_fetch_assoc($result)){ 
     $output[]=$e; 
     } 

     print(json_encode($output)); 
     $mysqli->close(); 
?> 

私はあなたがJsonArrayを取得して、サーバーからこのエラー

04-26 04:00:35.012: W/System.err(2371): org.json.JSONException: Value [{"poiName":"Limassol old port","poiID":"2"},{"poiName":"larnaca 

port","poiID":"7"},{"poiName":"paphos port","poiID":"8"}] of type 

org.json.JSONArray cannot be converted to JSONObject 

Answer 1

を取得していますが、あなたの解析などオブジェクト。

コードを修正しました。今すぐお試しください。

  @Override 
      protected Void doInBackground(Void... arg0) { 
       // TODO Auto-generated method stub 
       ServiceHandler jsonParser = new ServiceHandler(); 
       String json = jsonParser.makeServiceCall(url_list_poi, ServiceHandler.GET); 

       Log.e("Response: ",">"+json); 

       if(json != null){ 
        try{ 
         JSONArray poiArray = new JSONArray (json); 
         if (poiArray!= null){ 
          for(int i=0;i<poiArray.length();i++){ 
           JSONObject poiObj = (JSONObject) poiArray.get(i); 
           POI poi = new POI (poiObj.getInt("poiID"), poiObj.getString("poiName")); 
           POIList.add(poi); 
           Log.i("POI List is:", POIList.toString()); 
           } 
         } 
        }catch(JSONException e){ 
         e.printStackTrace(); 
        } 
       }else{ 
        Log.e("JSON data", "didnt receive any data from server!"); 
       } 



       return null; 
      }