Null pointer exception on my image loader function using volley library

Question

i'm trying to download and load images to my NetworkImageView in my android application.. but i'm getting this error

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'com.android.volley.toolbox.ImageLoader com.example.username.socialoid.AppController.getImageLoader()' on a null object reference

don't what's going on. Generally the null pointer happens because of declaration errors but i'm doing no mistake here.. please help..

Here are my code snippiest

    // user profile pic
    profilePic.setImageUrl(item.getProfilePic(), imageLoader);

and imageloader is in other class as follow

private RequestQueue mRequestQueue;
private ImageLoader mImageLoader;

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

    return this.mImageLoader;
}

my LruBitmapCache class

 import com.android.volley.toolbox.ImageLoader.ImageCache;
 import android.graphics.Bitmap;
 import android.support.v4.util.LruCache;

 public class LruBitmapCache extends LruCache<String, Bitmap> implements
    ImageCache {
 public static int getDefaultLruCacheSize() {
    final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
    final int cacheSize = maxMemory / 8;

    return cacheSize;
}

public LruBitmapCache() {
    this(getDefaultLruCacheSize());
}

public LruBitmapCache(int sizeInKiloBytes) {
    super(sizeInKiloBytes);
}

@Override
protected int sizeOf(String key, Bitmap value) {
    return value.getRowBytes() * value.getHeight() / 1024;
}

@Override
public Bitmap getBitmap(String url) {
    return get(url);
}

@Override
public void putBitmap(String url, Bitmap bitmap) {
    put(url, bitmap);
}
}

complete Log ::

11-30 15:35:39.635  27827-27827/com.example.hissamyousaf.socialoid E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example.hissamyousaf.socialoid, PID: 27827
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.hissamyousaf.socialoid/com.example.hissamyousaf.socialoid.Home}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.hissamyousaf.socialoid/com.example.hissamyousaf.socialoid.NewsFeed}: java.lang.NullPointerException: Attempt to invoke virtual method 'com.android.volley.toolbox.ImageLoader com.example.hissamyousaf.socialoid.AppController.getImageLoader()' on a null object reference
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2693)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
            at android.app.ActivityThread.access$900(ActivityThread.java:177)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:145)
            at android.app.ActivityThread.main(ActivityThread.java:5942)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
     Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.hissamyousaf.socialoid/com.example.hissamyousaf.socialoid.NewsFeed}: java.lang.NullPointerException: Attempt to invoke virtual method 'com.android.volley.toolbox.ImageLoader com.example.hissamyousaf.socialoid.AppController.getImageLoader()' on a null object reference
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2693)
            at android.app.ActivityThread.startActivityNow(ActivityThread.java:2435)
            at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
            at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
            at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:776)
            at android.widget.TabHost.setCurrentTab(TabHost.java:435)
            at android.widget.TabHost.addTab(TabHost.java:262)
            at com.example.hissamyousaf.socialoid.Home.onCreate(Home.java:42)
            at android.app.Activity.performCreate(Activity.java:6289)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
            at android.app.ActivityThread.access$900(ActivityThread.java:177)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:145)
            at android.app.ActivityThread.main(ActivityThread.java:5942)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'com.android.volley.toolbox.ImageLoader com.example.hissamyousaf.socialoid.AppController.getImageLoader()' on a null object reference
            at com.example.hissamyousaf.socialoid.FeedListAdapter.<init>(FeedListAdapter.java:28)
            at com.example.hissamyousaf.socialoid.NewsFeed.onCreate(NewsFeed.java:43)
            at android.app.Activity.performCreate(Activity.java:6289)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
            at android.app.ActivityThread.startActivityNow(ActivityThread.java:2435)
            at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
            at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
            at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:776)
            at android.widget.TabHost.setCurrentTab(TabHost.java:435)
            at android.widget.TabHost.addTab(TabHost.java:262)
            at com.example.hissamyousaf.socialoid.Home.onCreate(Home.java:42)
            at android.app.Activity.performCreate(Activity.java:6289)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
            at android.app.ActivityThread.access$900(ActivityThread.java:177)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:145)
            at android.app.ActivityThread.main(ActivityThread.java:5942)
            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:1399)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)

could you provide source of the getRequestQueue() and getLruBitmapCache() methods? — Mayur Raiyani, Nov 30 '15 at 09:43
Possible duplicate of [What is a Null Pointer Exception, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do-i-fix-it) — Raf, Nov 30 '15 at 09:45
@MayurRaiyani please check the question, i've included LruBitmapCache() — deejay, Nov 30 '15 at 09:54
have you initialized mRequestQueue and mLruBitmapCache? and please post the whole log — Ishan, Nov 30 '15 at 09:55
@MayurRaiyani here is getRequestQueue public RequestQueue getRequestQueue() { if (mRequestQueue == null) { mRequestQueue = Volley.newRequestQueue(getApplicationContext()); } return mRequestQueue; } — deejay, Nov 30 '15 at 09:55
yes i've initialized RequestQueue and Bitmapcache private RequestQueue mRequestQueue; private ImageLoader mImageLoader; LruBitmapCache mLruBitmapCache; — deejay, Nov 30 '15 at 10:00

Null pointer exception on my image loader function using volley library

0 Answers0