java - Android - NullPointerException: storage == null -


hi i'm having problems android app i'm building off of tutorial online, keeps crashing when try run mentioned exception. appreciate on how stop error please. here's main activity:

package com.niall.easytxt;  import android.app.activity; import android.content.intent; import android.database.datasetobserver; import android.os.bundle; import android.view.keyevent; import android.view.menu; import android.view.menuitem; import android.view.view; import android.view.view.onkeylistener; import android.widget.abslistview; import android.widget.button; import android.widget.edittext; import android.widget.listview;  public class mainactivity extends activity {  private chatarrayadapter adp; private listview list; private edittext chattext;   private button send; intent in; private boolean side = false; @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      intent = getintent();     send = (button)findviewbyid(r.id.btn);     list = (listview)findviewbyid(r.id.listview);     adp = new chatarrayadapter(getapplicationcontext(),r.layout.chat, null);     chattext = (edittext)findviewbyid(r.id.chat);     chattext.setonkeylistener(new onkeylistener(){         public boolean onkey(view v, int keycode, keyevent event){             if((event.getaction()==keyevent.action_down) && (keycode == keyevent.keycode_enter))             {                 return sendchatmessage();             }               return false;         }           });     send.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {              sendchatmessage();         }     });      list.settranscriptmode(abslistview.transcript_mode_always_scroll);     list.setadapter(adp);     adp.registerdatasetobserver(new datasetobserver() {         public void onchanged(){             super.onchanged();             list.setselection(adp.getcount() -1);         }      });       }   private boolean sendchatmessage() {       adp.add(new chatmessage(side,chattext.gettext().tostring()));     chattext.settext("");      side =! side;       return true; }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main, menu);     return true; }  @override public boolean onoptionsitemselected(menuitem item) {     // handle action bar item clicks here. action bar     // automatically handle clicks on home/up button, long     // specify parent activity in androidmanifest.xml.     int id = item.getitemid();     if (id == r.id.action_settings) {         return true;     }     return super.onoptionsitemselected(item); } }

and chatarrayadapter:

package com.niall.easytxt;  import java.util.arraylist; import java.util.list;  import android.content.context; import android.graphics.bitmap; import android.graphics.bitmapfactory; import android.view.gravity; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.arrayadapter; import android.widget.linearlayout; import android.widget.textview;  public class chatarrayadapter extends arrayadapter<chatmessage>{ private textview chattext; private list<chatmessage> messagelist = new arraylist<chatmessage>(); private linearlayout layout;     public chatarrayadapter(context context, int resource, chatmessage[] objects) {     super(context, resource, objects);  }  public void add(chatmessage object) {      messagelist.add(object);     super.add(object); } public int getcount() {     return this.messagelist.size(); } public chatmessage getitem(int index) {      return this.messagelist.get(index);  } public view getview(int position, view convertview, viewgroup parent) {     view v = convertview;     if(v==null){         layoutinflater inflater = (layoutinflater) this.getcontext().getsystemservice(context.layout_inflater_service);         v =inflater.inflate(r.layout.chat, parent,false);     }      layout = (linearlayout)v.findviewbyid(r.id.message1);     chatmessage messageobj = getitem(position);     chattext = (textview)v.findviewbyid(r.id.singlemessage);      chattext.settext(messageobj.message);     chattext.setbackgroundresource(messageobj.left ? r.drawable.bubble_a :r.drawable.bubble_b);     layout.setgravity(messageobj.left?gravity.start:gravity.end);      return v;  } public bitmap decodetobitmap(byte[] decodedbyte){     return bitmapfactory.decodebytearray(decodedbyte, 0, decodedbyte.length); }  }

here's logcat

04-29 05:40:03.988: d/androidruntime(1794): shutting down vm 04-29 05:40:03.988: e/androidruntime(1794): fatal exception: main 04-29 05:40:03.988: e/androidruntime(1794): process: com.niall.easytxt, pid: 1794 04-29 05:40:03.988: e/androidruntime(1794): java.lang.runtimeexception: unable start activity componentinfo{com.niall.easytxt/com.niall.easytxt.mainactivity}: java.lang.nullpointerexception: storage == null 04-29 05:40:03.988: e/androidruntime(1794):     @ android.app.activitythread.performlaunchactivity(activitythread.java:2298) 04-29 05:40:03.988: e/androidruntime(1794):     @ android.app.activitythread.handlelaunchactivity(activitythread.java:2360) 04-29 05:40:03.988: e/androidruntime(1794):     @ android.app.activitythread.access$800(activitythread.java:144) 04-29 05:40:03.988: e/androidruntime(1794):     @ android.app.activitythread$h.handlemessage(activitythread.java:1278) 04-29 05:40:03.988: e/androidruntime(1794):     @ android.os.handler.dispatchmessage(handler.java:102) 04-29 05:40:03.988: e/androidruntime(1794):     @ android.os.looper.loop(looper.java:135) 04-29 05:40:03.988: e/androidruntime(1794):     @ android.app.activitythread.main(activitythread.java:5221) 04-29 05:40:03.988: e/androidruntime(1794):     @ java.lang.reflect.method.invoke(native method) 04-29 05:40:03.988: e/androidruntime(1794):     @ java.lang.reflect.method.invoke(method.java:372) 04-29 05:40:03.988: e/androidruntime(1794):     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:899) 04-29 05:40:03.988: e/androidruntime(1794):     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:694) 04-29 05:40:03.988: e/androidruntime(1794): caused by: java.lang.nullpointerexception: storage == null 04-29 05:40:03.988: e/androidruntime(1794):     @ java.util.arrays$arraylist.<init>(arrays.java:38) 04-29 05:40:03.988: e/androidruntime(1794):     @ java.util.arrays.aslist(arrays.java:155) 04-29 05:40:03.988: e/androidruntime(1794):     @ android.widget.arrayadapter.<init>(arrayadapter.java:128) 04-29 05:40:03.988: e/androidruntime(1794):     @ com.niall.easytxt.chatarrayadapter.<init>(chatarrayadapter.java:26) 04-29 05:40:03.988: e/androidruntime(1794):     @ com.niall.easytxt.mainactivity.oncreate(mainactivity.java:33) 04-29 05:40:03.988: e/androidruntime(1794):     @ android.app.activity.performcreate(activity.java:5933) 04-29 05:40:03.988: e/androidruntime(1794):     @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1105) 04-29 05:40:03.988: e/androidruntime(1794):     @ android.app.activitythread.performlaunchactivity(activitythread.java:2251) 04-29 05:40:03.988: e/androidruntime(1794):     ... 10 more 

adp = new chatarrayadapter(getapplicationcontext(),r.layout.chat, null);

your problem lies on line. passing null dataset. null reference of chatmessage[]. super constructor calls 

arrays.aslist(objects)

which causing exception. fix provide empty dataset. eg change constructor like:

public chatarrayadapter(context context, int resource) {     super(context, resource, messagelist); }

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