When I run my android app in the AVD it gives me an error -

the avd says "unfortunately, service has stopped", service name of app. please tell me went wrong. have posted code of 2 files :

mainactivity.java:

public class mainactivity extends activity {     protected void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);          setcontentview(r.layout.activity_main);          button start, stop;          start = (button) findviewbyid(r.id.button1);         stop = (button) findviewbyid(r.id.button2);          start.setonclicklistener(new view.onclicklistener() {          @override          public void onclick(view v) {          intent service = new intent(mainactivity.this, myservice.class);          startservice(service);          }          });          stop.setonclicklistener(new view.onclicklistener() {          @override            public void onclick(view v) {          intent name = new intent(mainactivity.this, myservice.class);          stopservice(name);          }          });          }  } 

myservice.java:

public class myservice extends service {      @override     public ibinder onbind(intent arg0) {             return null;     }      @override     public void oncreate() {         super.oncreate();     }      @override     public int onstartcommand(intent intent, int flags, int startid) {         new alertdialog.builder(this).settitle("argh").setmessage("watch out!").setneutralbutton("close", null).show();         return 0;     }      @override     public void ondestroy() {          super.ondestroy();      }  } 

activity_main.xml:

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:paddingbottom="@dimen/activity_vertical_margin"     android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin"     tools:context=".mainactivity" >      <button         android:id="@+id/button1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignparentleft="true"         android:layout_alignparenttop="true"         android:layout_marginleft="20dp"         android:text="play" />      <button         android:id="@+id/button2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignbaseline="@+id/button1"         android:layout_alignbottom="@+id/button1"         android:layout_centerhorizontal="true"         android:text="stop" />  </relativelayout> 

this logcat says:

04-18 18:48:48.724: e/trace(852): error opening trace file: no such file or directory (2) 04-18 18:48:49.683: d/gralloc_goldfish(852): emulator without gpu emulation detected. 

the error message displayed after click on start button.

thanks in advance :)

i don't think can generate alertdialog in service without context activity. if want know if service started or not, try logging it:

log.i("myservice","service started"); 

and check in logcat doing:

logcat -s "myservice" 

if want display alertdialog, trying @ this post.