android - getExtras NullPointerException -

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• what nullpointerexception, , how fix it? 12 answers

app crash nullpointerexception in line int position = i.getextras().getint("id"); problem ? tell me please !

i build on tutorial http://seegatesite.com/android-tutorial-display-image-to-android-gridview-from-url-using-picasso

@override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         final gridview gridview = (gridview) findviewbyid(r.id.gridview);         gridview.setadapter(new imageadapter(this));         gridview.setonitemclicklistener(new adapterview.onitemclicklistener() {             public void onitemclick(adapterview<?> parent, view v, int position, long id) {                 intent = new intent(getapplicationcontext(), fullimageactivity.class);                 i.putextra("id", position);                 startactivity(i); 

fullimageactivity

public class fullimageactivity extends activity {  imageview img; @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.fullimageview);            intent = getintent();      int position = i.getextras().getint("id");     imageadapter imageadapter = new imageadapter(this);      img = (imageview) findviewbyid(r.id.image);     string url = imageadapter.getitem(position);      new downloadimage().execute(url); } private class downloadimage extends asynctask<string, void, bitmap> {      @override     protected bitmap doinbackground(string... url) {         string imageurl = url[0];         bitmap bitmap = null;         try {             inputstream input = new java.net.url(imageurl).openstream();             bitmap = bitmapfactory.decodestream(input);         } catch (exception e) {             e.printstacktrace();         }         return bitmap;     }      @override     protected void onpostexecute(bitmap result) {         img.setimagebitmap(result);     } } 

imageadapter

public class imageadapter extends baseadapter {     private context mcontext;     int imagetotal = 7;     public static string[] mthumbids = {             "http://i.imgur.com/kzqo.jpg",             "http://i.imgur.com/87ke.jpg",             "http://i.imgur.com/hej.jpg",             "http://i.imgur.com/3d3.jpg",             "http://i.imgur.com/wli.jpg",             "http://i.imgur.com/pp.jpg",             "http://i.imgur.com/ldt.jpg",     };      public imageadapter(context c) {         mcontext = c;     }      public int getcount() {         return imagetotal;     }      @override     public string getitem(int position) {         return mthumbids[position];     }      public long getitemid(int position) {         return 0;     }      public view getview(int position, view convertview, viewgroup parent) {         imageview imageview;         if (convertview == null) {             imageview = new imageview(mcontext);             imageview.setlayoutparams(new gridview.layoutparams(220, 220));             imageview.setscaletype(imageview.scaletype.center_crop);             imageview.setpadding(8, 8, 8, 8);         } else {             imageview = (imageview) convertview;         }         string url = getitem(position);         picasso.with(mcontext)                 .load(url)                 .placeholder(r.drawable.loader)                 .fit()                 .centercrop().into(imageview);         return imageview;     } } 

errors

java.lang.runtimeexception: unable start activity componentinfo{123.myapplication/123.myapplication.fullimageactivity}: java.lang.nullpointerexception @ android.app.activitythread.performlaunchactivity(activitythread.java:2295) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2349) @ android.app.activitythread.access$700(activitythread.java:159) @ android.app.activitythread$h.handlemessage(activitythread.java:1316) @ android.os.handler.dispatchmessage(handler.java:99) @ android.os.looper.loop(looper.java:176) @ android.app.activitythread.main(activitythread.java:5419) @ java.lang.reflect.method.invokenative(native method) @ java.lang.reflect.method.invoke(method.java:525) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1046) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:862) @ dalvik.system.nativestart.main(native method) caused by: java.lang.nullpointerexception @ 123.myapplication.fullimageactivity.oncreate(fullimageactivity.java:30) @ android.app.activity.performcreate(activity.java:5372) @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1104) @ android.app.activitythread.performlaunchactivity(activitythread.java:2257) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2349)  @ android.app.activitythread.access$700(activitythread.java:159)  @ android.app.activitythread$h.handlemessage(activitythread.java:1316)  @ android.os.handler.dispatchmessage(handler.java:99)  @ android.os.looper.loop(looper.java:176)  @ android.app.activitythread.main(activitythread.java:5419)  @ java.lang.reflect.method.invokenative(native method)  @ java.lang.reflect.method.invoke(method.java:525)  @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1046)  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:862)  @ dalvik.system.nativestart.main(native method)  

try out following code:

replace :

intent intent = new intent(getapplicationcontext(), fullimageactivity.class);   

with this:

intent intent = new intent(mainactivity.this, fullimageactivity.class);    

and then:

intent = getintent(); bundle extras = i.getextras(); int position = extras.getint("id");