Nullpointer exception while loading image from url

Question

I am developing an application with rest web service. By getting the json response from server, am parsing it and populating it in a custom list view using adapter. In that json response there are url's to download image to display in list items. Every thing has been done and working fine, except loading image from url there is Nullpointer exception. I have done debugging also, logcat shows as follows

    java.lang.NullPointerException
    at android.widget.AbsListView.obtainView(AbsListView.java:2269)
    at android.widget.ListView.measureHeightOfChildren(ListView.java:1244)
    at android.widget.ListView.onMeasure(ListView.java:1156)
    at android.view.View.measure(View.java:15172)
    at android.widget.RelativeLayout.measureChild(RelativeLayout.java:602)
    at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:415)
    at android.view.View.measure(View.java:15172)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
    at android.view.View.measure(View.java:15172)
    at android.widget.LinearLayout.measureVertical(LinearLayout.java:833)
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
    at android.view.View.measure(View.java:15172)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2
    at android.view.View.measure(View.java:15172)
    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1848)
    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1100)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1273)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
    at android.view.Choreographer.doCallbacks(Choreographer.java:555)
    at android.view.Choreographer.doFrame(Choreographer.java:525)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
    at android.os.Handler.handleCallback(Handler.java:615)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4745)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
    at dalvik.system.NativeStart.main(Native Method)
    Force finishing activity com.shopping/.views.JsonListView

Can some one help me to find the reason why getting this exception.

Edit:

     int loader = R.drawable.fb_icon;
 // ImageLoader class instance
 ImageLoader imgLoader = new ImageLoader(_Context);


 imgLoader.DisplayImage(imageUrl, loader, holder.productImage);
     public void DisplayImage(String url, int loader, ImageView imageView)
     {  
        stub_id = loader;
        imageViews.put(imageView, url);
        Bitmap bitmap=memoryCache.get(url);
        if(bitmap!=null)
           imageView.setImageBitmap(bitmap);
        else
        {
            queuePhoto(url, imageView);
            imageView.setImageResource(loader);
        }
      }

@Androholic Please post some code so we can help you more and are you using lazy loading for download and display image in listview. — Dipak Keshariya
– Dipak Keshariya, Commented Oct 29, 2012 at 12:25

Dipak Keshariya · Accepted Answer · 2012-10-29 12:36:28Z

1

Write below line into your adapter's getview() method.

imageLoader.DisplayImage(url[position], imageview1);

and see below lazy loading link for more information and if you have any query regarding that then tell me.

Lazy Loading Listview

answered Oct 29, 2012 at 12:36

Dipak Keshariya

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2 Comments

Androholic Over a year ago

am passing arraylist to adapter class that contains 2 strings (1 for text, 2nd for url). Converting that into String array in adapter constructor. and using those strings. how can i use that string like url[position]?

Dipak Keshariya Over a year ago

@Androholic Pass this string instead of url[position] and check.

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