NullPointerException при использовании CustomListAdapter

Я создаю CustomListAdapter в Android Appiclation. Но я получаю эту ошибку NullPointerException при ее реализации.NullPointerException при использовании CustomListAdapter

Вот мой CustomListAdapter.java код:

/** 
* 
*/ 
package com.fanjavaid.searchhttprequest.adapter; 

import java.util.List; 

import com.android.volley.toolbox.ImageLoader; 
import com.android.volley.toolbox.NetworkImageView; 
import com.fanjavaid.searchhttprequest.R; 
import com.fanjavaid.searchhttprequest.app.AppController; 
import com.fanjavaid.searchhttprequest.model.Menu; 

import android.app.Activity; 
import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.TextView; 

/** 
* @author fanjavaid 
* 
*/ 
public class CustomListAdapter extends BaseAdapter { 

    private Activity activity; 

    private LayoutInflater inflater; 

    private List<Menu> menuItems; 

    ImageLoader imageLoader = AppController.getInstance().getImageLoader(); 

    public CustomListAdapter(Activity activity, List<Menu> menuItems) { 
     this.activity = activity; 
     this.menuItems = menuItems; 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return menuItems.size(); 
    } 

    @Override 
    public Object getItem(int location) { 
     // TODO Auto-generated method stub 
     return menuItems.get(location); 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     if (inflater == null) 
      inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

     if (convertView == null) 
      convertView = inflater.inflate(R.layout.list_row, null); 

     if (imageLoader == null) 
      imageLoader = AppController.getInstance().getImageLoader(); 
      NetworkImageView thumbNail = (NetworkImageView) convertView.findViewById(R.id.thumbnail); 
      TextView menuTitle = (TextView) convertView.findViewById(R.id.menuTitle); 
      TextView inputDate = (TextView) convertView.findViewById(R.id.postDate); 

     // Getting movie data for the row 
     Menu m = menuItems.get(position); 

     // thumbnail image 
     thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader); 

     // title 
     menuTitle.setText(m.getMenuTitle()); 

     // input date 
     inputDate.setText("Post Date : " + String.valueOf(m.getInputDate().toString())); 

     return convertView; 
    } 

}

И вот мой код активность:

package com.fanjavaid.searchhttprequest; 

import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.ArrayList; 
import java.util.Date; 
import java.util.List; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import com.fanjavaid.searchhttprequest.adapter.CustomListAdapter; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.ListView; 

public class ListMenuActivity extends Activity { 

    // Log tag 
    private static final String TAG = ListMenuActivity.class.getSimpleName(); 

    // Movie JSON Url 
    private List<com.fanjavaid.searchhttprequest.model.Menu> menuList = new ArrayList<com.fanjavaid.searchhttprequest.model.Menu>(); 
    private ListView listView; 
    private CustomListAdapter adapter; 

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

     listView = (ListView) findViewById(R.id.list); 
     adapter = new CustomListAdapter(this, menuList); 
     listView.setAdapter(adapter); 

     Intent intent = getIntent(); 

     //String jsonData = intent.getStringExtra("json_menu"); 

     Bundle bundle = intent.getExtras(); 
     String jsonString = bundle.getString("json_menu"); 

     try { 
      JSONObject objectJson = new JSONObject(jsonString); 
      JSONArray arrayJson = objectJson.getJSONArray("results"); 

      for (int i = 0; i < arrayJson.length(); i++) { 

       JSONObject obj = arrayJson.getJSONObject(i); 

       com.fanjavaid.searchhttprequest.model.Menu menu = new com.fanjavaid.searchhttprequest.model.Menu(); 
       menu.setMenuTitle(obj.getString("nama_menu")); 
       menu.setThumbnailUrl("http://tempercube/receip_finder/" + obj.getString("gambar")); 

       String dateInString = obj.getString("tgl_input"); 
       SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); 
       Date parsedDate = formatter.parse(dateInString); 
       menu.setInputDate(parsedDate); 

       // add to list 
       menuList.add(menu); 
      } 

      // notifying list adapter about data changed 
      // so that it renders the list view with data changed 
      adapter.notifyDataSetChanged(); 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } catch (ParseException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.list_menu, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 
}

CustomListAdapter конкретизации уже добавлен до метода setAdapter() в моей деятельности. Но я до сих пор понимаю, что NullPointerException Ошибка.

Это моя ошибка LogCat

09-18 09:11:34.661: E/AndroidRuntime(24097): FATAL EXCEPTION: main 
09-18 09:11:34.661: E/AndroidRuntime(24097): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.fanjavaid.searchhttprequest/com.fanjavaid.searchhttprequest.ListMenuActivity}: java.lang.NullPointerException 
09-18 09:11:34.661: E/AndroidRuntime(24097): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2261) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2311) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at android.app.ActivityThread.access$600(ActivityThread.java:149) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1293) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at android.os.Looper.loop(Looper.java:137) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at android.app.ActivityThread.main(ActivityThread.java:5214) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at java.lang.reflect.Method.invokeNative(Native Method) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at java.lang.reflect.Method.invoke(Method.java:525) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at dalvik.system.NativeStart.main(Native Method) 
09-18 09:11:34.661: E/AndroidRuntime(24097): Caused by: java.lang.NullPointerException 
09-18 09:11:34.661: E/AndroidRuntime(24097): at com.fanjavaid.searchhttprequest.adapter.CustomListAdapter.<init>(CustomListAdapter.java:34) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at com.fanjavaid.searchhttprequest.ListMenuActivity.onCreate(ListMenuActivity.java:38) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at android.app.Activity.performCreate(Activity.java:5133) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
09-18 09:11:34.661: E/AndroidRuntime(24097): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2225) 
09-18 09:11:34.661: E/AndroidRuntime(24097): ... 11 more

И это мой AppController.java

/** 
* 
*/ 
package com.fanjavaid.searchhttprequest.app; 

import com.android.volley.Request; 
import com.android.volley.RequestQueue; 
import com.android.volley.toolbox.ImageLoader; 
import com.android.volley.toolbox.Volley; 
import com.fanjavaid.searchhttprequest.util.LruBitmapCache; 

import android.app.Application; 
import android.text.TextUtils; 

/** 
* @author fanjavaid 
* 
*/ 
public class AppController extends Application { 
    public static final String TAG = AppController.class.getSimpleName(); 

    private RequestQueue mRequestQueue; 
    private ImageLoader mImageLoader; 

    private static AppController mInstance; 

    @Override 
    public void onCreate() { 
     super.onCreate(); 
     mInstance = this; 
    } 

    public static synchronized AppController getInstance() { 
     return mInstance; 
    } 

    public RequestQueue getRequestQueue() { 
     if (mRequestQueue == null) { 
      mRequestQueue = Volley.newRequestQueue(getApplicationContext()); 
     } 

     return mRequestQueue; 
    } 

    public ImageLoader getImageLoader() { 
     getRequestQueue(); 
     if (mImageLoader == null) { 
      mImageLoader = new ImageLoader(this.mRequestQueue, 
        new LruBitmapCache()); 
     } 
     return this.mImageLoader; 
    } 

    public <T> void addToRequestQueue(Request<T> req, String tag) { 
     // set the default tag if tag is empty 
     req.setTag(TextUtils.isEmpty(tag) ? TAG : tag); 
     getRequestQueue().add(req); 
    } 

    public <T> void addToRequestQueue(Request<T> req) { 
     req.setTag(TAG); 
     getRequestQueue().add(req); 
    } 

    public void cancelPendingRequests(Object tag) { 
     if (mRequestQueue != null) { 
      mRequestQueue.cancelAll(tag); 
     } 
    } 
}

И это один мой MainActivity.java

package com.fanjavaid.searchhttprequest; 

import java.util.LinkedList; 
import java.util.List; 

import org.apache.http.client.utils.URLEncodedUtils; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONArray; 
import org.json.JSONObject; 

import com.android.volley.Request.Method; 
import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.VolleyLog; 
import com.android.volley.toolbox.JsonArrayRequest; 
import com.android.volley.toolbox.JsonObjectRequest; 

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.TextView; 


public class MainActivity extends Activity { 

    private TextView responseText; 
    private EditText searchText; 
    private String url; 

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

     responseText = (TextView) findViewById(R.id.textView1); 
     searchText = (EditText) findViewById(R.id.searchBox); 

     url = "http://tempercube.com/receip_finder/process_cari.php"; 
    } 

    private String addLocationToUrl(String url, String parameter) { 
     if (!url.endsWith("?")) 
      url += "?"; 

     List<BasicNameValuePair> params = new LinkedList<BasicNameValuePair>(); 
     params.add(new BasicNameValuePair("bahan", parameter)); 

     String paramString = URLEncodedUtils.format(params, "utf-8"); 
     url += paramString; 

     return url; 
    } 

    public void doRequest(String passUrl) { 
     final ProgressDialog pDialog = new ProgressDialog(this); 
     pDialog.setMessage("Loading..."); 
     pDialog.show(); 

     JsonObjectRequest jsonObjRequest = new JsonObjectRequest(Method.GET, passUrl, null, 
       new Response.Listener<JSONObject>() { 

        @Override 
        public void onResponse(JSONObject response) { 
         // TODO Auto-generated method stub 
         Log.d("TAG", response.toString()); 
         responseText.setText(response.toString()); 

         Intent intent = new Intent("com.fanjavaid.searchhttprequest.ListMenuActivity"); 

         Bundle extras = new Bundle(); 
         extras.putString("json_menu", response.toString()); 

         intent.putExtras(extras); 

         startActivity(intent); 

         pDialog.hide(); 
        } 

       }, 

       new Response.ErrorListener() { 

        @Override 
        public void onErrorResponse(VolleyError error) { 
         // TODO Auto-generated method stub 
         Log.d("ERROR", "Error : " + error.getMessage()); 
         pDialog.hide(); 
        } 

       }); 

     // Make request queue 
     VolleySingleton.getInstance(getApplicationContext()).addToRequestQueue(jsonObjRequest); 

    } 

    public void searchMenu(View view) { 
     if(view.getId() == R.id.button1){ 
      String paramSearch = searchText.getText().toString(); 
      url = addLocationToUrl(url, paramSearch); 

      Log.d("URL_INFO", url); 

      doRequest(url); 

      // reset URL 
      url = "http://tempercube.com/receip_finder/process_cari.php"; 
     } 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 
}

И последний мой list_activity. 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"> 

    <ListView 
     android:id="@+id/list" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:divider="@color/list_divider" 
     android:dividerHeight="1dp" 
     android:listSelector="@drawable/list_row_selector"> 
    </ListView> 

</RelativeLayout>

Пожалуйста, помогите. Большое спасибо.

источник

2014-09-17 fanjavaid

Ошибка в какой строке? –

можете ли вы отправить stacktrace из своего логарифма? – user3487063

В какой строке он падает? Показать журнал, пожалуйста? – erad

Я думаю, что вы не сделали добавить AppController в манифесте:

<application 
     android:name=".AppController" //this one 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme">

Вот почему OnCreate никогда не называли и mInstance равна нулю.

источник

2014-09-18 03:31:10 Bracadabra

Спасибо! Он работает сейчас: D – fanjavaid

Так хорошо, Но как я могу добавить еще AppControllers? :) – delive

@delive Используйте синглтоны и запустите их в своем основном контроллере, например. – Bracadabra

Я заметил, что вы используете private List<com.fanjavaid.searchhttprequest.model.Menu> menuList = new ArrayList<com.fanjavaid.searchhttprequest.model.Menu>();, но вы никогда не добавить что-нибудь к этому списку, прежде чем позвонить:

listView = (ListView) findViewById(R.id.list); 
adapter = new CustomListAdapter(this, menuList); 
listView.setAdapter(adapter);

Вы, наверное, хотите, чтобы положить что-то в этом menuList

источник

2014-09-17 18:20:07 erad

Но я уже добавляю в эту строку 'menuList.add (menu)'. – fanjavaid

NullPointerException при использовании CustomListAdapter

ответ

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