java - Nullpointer exception on Hashmap for CustomListAdapter? -


i cant life of me figure out. want add custom data listview hashmap .

the process put info in hashmap, put hashmap arraylist - causes nullpointerexception, , dont know how fix this. 

public class recipedownload extends activity {     // declare variables     arraylist<hashmap<string, string>> fooditems;     public static string titleoffood = "titleoffood";     public static string linktorecipe = "linktorecipe";     public static string ingredientsofrecipe = "ingredientsofrecipe";     public static string thumbnailoffood = "thumbnail";       public hashmap<string, string> recipeitems = new hashmap<string, string>();       edittext searchfield;     button researchbutton;      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         // view listview_main.xml         setcontentview(r.layout.recipedownload);          // declaration of button "refreshbutton".         researchbutton = (button) findviewbyid(r.id.refreshbutton);          // declaration of edittext "searchfield"         searchfield = (edittext) findviewbyid(r.id.searchfield);          searchfield.setselected(false);          searchfield.settext(mainactivity.itemtosearch);          // execute connectioncheck         checkconnection();          // recipe list context menu         //registerforcontextmenu(recipelist);              recipeitems.put(titleoffood, "href");         recipeitems.put(linktorecipe, "href");         recipeitems.put(ingredientsofrecipe, "ingredients");         recipeitems.put(thumbnailoffood, "thumbnail");          fooditems.add(recipeitems);       }

this creates nullpointerexception @ row 71.

09-04 16:16:46.589: e/androidruntime(10372): fatal exception: main 09-04 16:16:46.589: e/androidruntime(10372): java.lang.runtimeexception: unable start activity componentinfo{org.paul.barcoder/org.paul.barcoder.recipedownload}: java.lang.nullpointerexception 09-04 16:16:46.589: e/androidruntime(10372):    @ android.app.activitythread.performlaunchactivity(activitythread.java:2100) 09-04 16:16:46.589: e/androidruntime(10372):    @ android.app.activitythread.handlelaunchactivity(activitythread.java:2125) 09-04 16:16:46.589: e/androidruntime(10372):    @ android.app.activitythread.access$600(activitythread.java:140) 09-04 16:16:46.589: e/androidruntime(10372):    @ android.app.activitythread$h.handlemessage(activitythread.java:1227) 09-04 16:16:46.589: e/androidruntime(10372):    @ android.os.handler.dispatchmessage(handler.java:99) 09-04 16:16:46.589: e/androidruntime(10372):    @ android.os.looper.loop(looper.java:137) 09-04 16:16:46.589: e/androidruntime(10372):    @ android.app.activitythread.main(activitythread.java:4898) 09-04 16:16:46.589: e/androidruntime(10372):    @ java.lang.reflect.method.invokenative(native method) 09-04 16:16:46.589: e/androidruntime(10372):    @ java.lang.reflect.method.invoke(method.java:511) 09-04 16:16:46.589: e/androidruntime(10372):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1006) 09-04 16:16:46.589: e/androidruntime(10372):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:773) 09-04 16:16:46.589: e/androidruntime(10372):    @ dalvik.system.nativestart.main(native method) 09-04 16:16:46.589: e/androidruntime(10372): caused by: java.lang.nullpointerexception 09-04 16:16:46.589: e/androidruntime(10372):    @ org.paul.barcoder.recipedownload.oncreate(recipedownload.java:71) 09-04 16:16:46.589: e/androidruntime(10372):    @ android.app.activity.performcreate(activity.java:5206) 09-04 16:16:46.589: e/androidruntime(10372):    @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1083) 09-04 16:16:46.589: e/androidruntime(10372):    @ android.app.activitythread.performlaunchactivity(activitythread.java:2064) 09-04 16:16:46.589: e/androidruntime(10372):    ... 11 more

any appreciated.

initialize fooditems. didn't.

 fooditems = new arraylist<hashmap<string, string>>();

btw, start variable names lowercase.


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