not getting Images from server into my Listview in android
Question
i want show items with images which comes from the server into my ListView but am getting exception...i have added volly also in my dependencies but dont know why its not coming.. here is my SubMenu Activity
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.*;
import com.android.volley.toolbox.JsonArrayRequest;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class SubMenu extends AppCompatActivity {
// Log tag
private static final String TAG = SubMenu.class.getSimpleName();
// Movies json url
private static final String url = "http://cloud.granddubai.com/broccoli/menu_typeitem.php";
private ProgressDialog pDialog;
private List<Movie> movieList = new ArrayList<Movie>();
private ListView listView;
private CustomListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sub_menu);
listView = (ListView) findViewById(R.id.list1);
adapter = new CustomListAdapter(this, movieList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
// changing action bar color
getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#1b1b1b")));
// Creating volley request obj
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new com.android.volley.Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Movie movie = new Movie();
movie.setTitle(obj.getString("name"));
movie.setThumbnailUrl(obj.getString("image"));
// movie.setRating(((Number) obj.get("rating"))
// .doubleValue());
//movie.setYear(obj.getInt("releaseYear"));
// Genre is json array
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
// movie.setGenre(genre);
// adding movie to movies array
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new com.android.volley.Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
}
here is my Movie.java class
import java.util.ArrayList;
public class Movie {
private String title, thumbnailUrl;
private double rating;
private ArrayList<String> genre;
public Movie() {
}
public Movie(String name, String thumbnailUrl, int year, double rating,
ArrayList<String> genre) {
this.title = name;
this.thumbnailUrl = thumbnailUrl;
//this.year = year;
// this.rating = rating;
//this.genre = genre;
}
public String getTitle() {
return title;
}
public void setTitle(String name) {
this.title = name;
}
public String getThumbnailUrl() {
return thumbnailUrl;
}
public void setThumbnailUrl(String thumbnailUrl) {
this.thumbnailUrl = thumbnailUrl;
}
// public int getYear() {return year;}
// public void setYear(int year) {
// this.year = year;
//}
// public double getRating() {
// return rating;
//}
// public void setRating(double rating) {
// this.rating = rating;
//}
//public ArrayList<String> getGenre() {
//return genre;
//}
// public void setGenre(ArrayList<String> genre) {
//this.genre = genre;
//}
}
here is my CustomListAdapter
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;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;
import java.util.List;
//import info.androidhive.customlistviewvolley.app.AppController;
//import info.androidhive.customlistviewvolley.model.Movie;
public class CustomListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Movie> movieItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public CustomListAdapter(Activity activity, List<Movie> movieItems) {
this.activity = activity;
this.movieItems = movieItems;
}
@Override
public int getCount() {
return movieItems.size();
}
@Override
public Object getItem(int location) {
return movieItems.get(location);
}
@Override
public long getItemId(int position) {
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_item1, null);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
NetworkImageView thumbNail = (NetworkImageView) convertView
.findViewById(R.id.imgs);
TextView title = (TextView) convertView.findViewById(R.id.type1);
//TextView rating = (TextView) convertView.findViewById(R.id.rating);
//TextView genre = (TextView) convertView.findViewById(R.id.genre);
//TextView year = (TextView) convertView.findViewById(R.id.releaseYear);
// getting movie data for the row
Movie m = movieItems.get(position);
// thumbnail image
thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader);
// title
title.setText(m.getTitle());
// rating
//rating.setText("Rating: " + String.valueOf(m.getRating()));
// genre
//String genreStr = "";
//for (String str : m.getGenre()) {
// genreStr += str + ", ";
// }
// genreStr = genreStr.length() > 0 ? genreStr.substring(0,
// genreStr.length() - 2) : genreStr;
//genre.setText(genreStr);
// release year
// year.setText(String.valueOf(m.getYear()));
return convertView;
}
}
Here is my AppController.java
import android.app.Application;
import android.text.TextUtils;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.Volley;
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);
}
}
}
one more thing i am unable to Import this two into my project
//import info.androidhive.customlistviewvolley.app.AppController;
//import info.androidhive.customlistviewvolley.model.Movie;
this is my list_item1.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<!-- Product id (pid) - will be DDEN - used to pass to other activity -->
<com.android.volley.toolbox.NetworkImageView
android:id="@+id/imgs"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:id="@+id/idq"
android:layout_width="30dp"
android:layout_height="30dp"/>
<TextView
android:id="@+id/type1"
android:textSize="20dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
here is my json response from postmant
[
{
"id": "1",
"name": "Bianca Pizza",
"image": "http://cloud.granddubai.com/broccoli/uploads/"
},
{
"id": "2",
"name": "Cheese Pizza",
"image": "http://cloud.granddubai.com/broccoli/uploads/Cheese.png"
},
{
"id": "3",
"name": "Chicken BBQ Pizza:",
"image": "http://cloud.granddubai.com/broccoli/uploads/Chicken BBQ.png"
},
{
"id": "4",
"name": "Deluxe Pizza",
"image": "http://cloud.granddubai.com/broccoli/uploads/Deluxe.png"
},
{
"id": "5",
"name": "Greek Pizza",
"image": "http://cloud.granddubai.com/broccoli/uploads/Greek.png"
},
{
"id": "6",
"name": "Hawaiian Pizza",
"image": "http://cloud.granddubai.com/broccoli/uploads/Hawaiian.png"
},
{
"id": "7",
"name": "Meat Lovers Pizza",
"image": "http://cloud.granddubai.com/broccoli/uploads/Meat Lovers.png"
},
{
"id": "8",
"name": "Pepperoni Pizza",
"image": ""
},
{
"id": "9",
"name": "Shrimp Pizza",
"image": ""
},
{
"id": "10",
"name": "Vegetable Pizza",
"image": ""
},
{
"id": "11",
"name": "Original Italian Pizza",
"image": ""
},
{
"id": "12",
"name": "Beef Strips Pasta",
"image": ""
},
{
"id": "13",
"name": "Chicken Pasta",
"image": ""
},
{
"id": "14",
"name": "Meat Balls Pasta",
"image": "http://cloud.granddubai.com/broccoli/uploads/Meat Lovers.png"
},
{
"id": "15",
"name": "Sausage Pasta",
"image": "http://cloud.granddubai.com/broccoli/uploads/Sausage.png"
},
{
"id": "16",
"name": "Shrimp Pasta",
"image": "http://cloud.granddubai.com/broccoli/uploads/Shrimp.png"
},
{
"id": "17",
"name": "Vegetable Pasta",
"image": "http://cloud.granddubai.com/broccoli/uploads/Vegetable.png"
},
{
"id": "18",
"name": "Pesto Pasta",
"image": "http://cloud.granddubai.com/broccoli/uploads/Pesto.png"
},
{
"id": "19",
"name": "Chicken Lasagna",
"image": ""
},
{
"id": "20",
"name": "Meat Lasagna",
"image": ""
},
{
"id": "21",
"name": "Vegetable Lasagna",
"image": ""
},
{
"id": "22",
"name": "Caesar Salad",
"image": "http://cloud.granddubai.com/broccoli/uploads/Caesar.png"
},
{
"id": "23",
"name": "Chicken Caesar Salad",
"image": "http://cloud.granddubai.com/broccoli/uploads/Chicken Caesar.png"
},
{
"id": "24",
"name": "Garden Salad",
"image": "http://cloud.granddubai.com/broccoli/uploads/Garden.png"
},
{
"id": "25",
"name": "Greek Salad",
"image": ""
},
{
"id": "26",
"name": "Pasta Salad",
"image": "http://cloud.granddubai.com/broccoli/uploads/Pasta Salad.png"
},
{
"id": "27",
"name": "Sunny Side up ",
"image": ""
},
{
"id": "28",
"name": "Omelette ",
"image": ""
},
{
"id": "29",
"name": "Scrambled Eggs",
"image": ""
},
{
"id": "30",
"name": "Scrambled Egg with toppings",
"image": ""
},
{
"id": "31",
"name": "Coffee",
"image": ""
},
{
"id": "32",
"name": "Fresh Juice",
"image": ""
},
{
"id": "36",
"name": "Water 500ml",
"image": ""
},
{
"id": "35",
"name": "Pepsi Can",
"image": ""
},
{
"id": "37",
"name": "Soup",
"image": ""
},
{
"id": "38",
"name": "Special Offer Family Pack",
"image": ""
}
]
here is my logcat:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.zeba.broccoli, PID: 23142
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.zeba.broccoli/com.example.zeba.broccoli.SubMenu}: java.lang.NullPointerException: Attempt to invoke virtual method 'com.android.volley.toolbox.ImageLoader com.example.zeba.broccoli.AppController.getImageLoader()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3190)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3300)
at android.app.ActivityThread.access$1000(ActivityThread.java:211)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1705)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6946)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'com.android.volley.toolbox.ImageLoader com.example.zeba.broccoli.AppController.getImageLoader()' on a null object reference
at com.example.zeba.broccoli.CustomListAdapter.<init>(CustomListAdapter.java:23)
at com.example.zeba.broccoli.SubMenu.onCreate(SubMenu.java:83)
at android.app.Activity.performCreate(Activity.java:6575)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1134)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3143)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3300)
at android.app.ActivityThread.access$1000(ActivityThread.java:211)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1705)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6946)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
here is my Manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.zeba.broccoli">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@mipmap/logo"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".RegistrationForm"
android:label="@string/title_activity_registration_form"
android:theme="@style/AppTheme.NoActionBar" />
<activity
android:name=".Login"
android:label="@string/title_activity_login"
android:theme="@style/AppTheme.NoActionBar" />
<activity
android:name=".Home"
android:label="@string/title_activity_home"
android:theme="@style/AppTheme.NoActionBar" />
<activity
android:name=".Menu_Detail"
android:label="@string/title_activity_menu__detail"
android:theme="@style/AppTheme.NoActionBar" />
<activity
android:name=".TypeMenu"
android:label="Menu"
android:theme="@style/AppTheme.NoActionBar" />
<activity
android:name=".SubMenu"
android:label="@string/title_activity_sub_menu"
android:theme="@style/AppTheme.NoActionBar">
<activity
android:name="AppController"
android:label="@string/title_activity_sub_menu"
android:theme="@style/AppTheme.NoActionBar"></activity>
<activity
android:name=".Movie"
android:label="@string/title_activity_sub_menu"
android:theme="@style/AppTheme.NoActionBar"></activity>
<activity
android:name=".CustomListAdapter"
android:label="@string/title_activity_sub_menu"
android:theme="@style/AppTheme.NoActionBar"></activity>
<activity
android:name=".LruBitmapCache"
android:label="@string/title_activity_sub_menu"
android:theme="@style/AppTheme.NoActionBar"></activity>
</activity>
1 answers
solution1
0 ACCPTED 2016-12-21 13:09:29
in the manifest add
android:name="com.example.zeba.broccoli.AppController"
to your
to elaberate
your code doesn't know you are extending application and doesn't call the oncreate which initialize the null variable , in order to do so , you need to explicitly say so in the manifest
example:
<application
android:allowBackup="true"
android:icon="@mipmap/logo"
android:name="com.example.zeba.broccoli.AppController"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
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