NullPointerException cuando se utiliza CustomListAdapter

Creo CustomListAdapter en Android Appiclation. Pero consigo este error NullPointerException cuando lo implemento.

Aquí está mi código de CustomListAdapter.java:

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 /** * */ 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; } } 

Y aquí está mi código de actividad:

 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); } } 

La instanciación de CustomListAdapter ya se ha añadido antes del método setAdapter () en mi actividad. Pero todavía consigo ese error de NullPointerException .

Este es mi error 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 

Y este mi 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); } } } 

Y este, mi 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); } } 

Y el último mi 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> 

Por favor ayuda. Muchas gracias.

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

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