android - Map View not working -

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hi newbie android development trying integrate map view in application , giving error.i have obtained api key , have double checked it. have pasted code along layout file , log file.can please.? thanks.

mainactivity.java  package com.vitarkasolutions.tracker;  import android.os.bundle;  import com.google.android.gms.maps.mapview; import com.google.android.maps.mapactivity;    public class mainactivity extends mapactivity {      mapview mapview;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         mapview=(mapview)findviewbyid(r.id.mymapview);     }      @override     protected boolean isroutedisplayed() {         // todo auto-generated method stub         return false;     }  }        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" >          <textview             android:id="@+id/cordinates "             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_alignparenttop="true"             android:text="your location x- , y- "              />         <button             android:id="@+id/button1"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_alignright="@+id/cordinates "             android:layout_aligntop="@+id/cordinates "             android:layout_marginright="46dp"             android:layout_margintop="56dp"             android:text="button" />          <com.google.android.maps.mapview             android:id="@+id/mymapview"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:layout_alignparentleft="true"             android:layout_below="@+id/button1"             android:layout_margintop="24dp"             android:apikey="mymapkey"             android:clickable="true"             android:enabled="true" >         </com.google.android.maps.mapview>       </relativelayout>        logcat 04-06 17:56:28.489: e/androidruntime(1798): fatal exception: main 04-06 17:56:28.489: e/androidruntime(1798): java.lang.runtimeexception: unable instantiate activity componentinfo{com.vitarkasolutions.tracker/com.vitarkasolutions.tracker.mainactivity}: java.lang.classnotfoundexception: didn't find class "com.vitarkasolutions.tracker.mainactivity" on path: dexpathlist[[zip file "/data/app/com.vitarkasolutions.tracker-2.apk"],nativelibrarydirectories=[/data/app-lib/com.vitarkasolutions.tracker-2, /vendor/lib, /system/lib]] 04-06 17:56:28.489: e/androidruntime(1798):     @ android.app.activitythread.performlaunchactivity(activitythread.java:2277) 04-06 17:56:28.489: e/androidruntime(1798):     @ android.app.activitythread.handlelaunchactivity(activitythread.java:2403) 04-06 17:56:28.489: e/androidruntime(1798):     @ android.app.activitythread.access$600(activitythread.java:165) 04-06 17:56:28.489: e/androidruntime(1798):     @ android.app.activitythread$h.handlemessage(activitythread.java:1373) 04-06 17:56:28.489: e/androidruntime(1798):     @ android.os.handler.dispatchmessage(handler.java:107) 04-06 17:56:28.489: e/androidruntime(1798):     @ android.os.looper.loop(looper.java:194) 04-06 17:56:28.489: e/androidruntime(1798):     @ android.app.activitythread.main(activitythread.java:5391) 04-06 17:56:28.489: e/androidruntime(1798):     @ java.lang.reflect.method.invokenative(native method) 04-06 17:56:28.489: e/androidruntime(1798):     @ java.lang.reflect.method.invoke(method.java:525) 04-06 17:56:28.489: e/androidruntime(1798):     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:833) 04-06 17:56:28.489: e/androidruntime(1798):     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:600) 04-06 17:56:28.489: e/androidruntime(1798):     @ dalvik.system.nativestart.main(native method) 04-06 17:56:28.489: e/androidruntime(1798): caused by: java.lang.classnotfoundexception: didn't find class "com.vitarkasolutions.tracker.mainactivity" on path: dexpathlist[[zip file "/data/app/com.vitarkasolutions.tracker-2.apk"],nativelibrarydirectories=[/data/app-lib/com.vitarkasolutions.tracker-2, /vendor/lib, /system/lib]] 04-06 17:56:28.489: e/androidruntime(1798):     @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:53) 04-06 17:56:28.489: e/androidruntime(1798):     @ java.lang.classloader.loadclass(classloader.java:501) 04-06 17:56:28.489: e/androidruntime(1798):     @ java.lang.classloader.loadclass(classloader.java:461) 04-06 17:56:28.489: e/androidruntime(1798):     @ android.app.instrumentation.newactivity(instrumentation.java:1119) 04-06 17:56:28.489: e/androidruntime(1798):     @ android.app.activitythread.performlaunchactivity(activitythread.java:2268) 04-06 17:56:28.489: e/androidruntime(1798):     ... 11 more

that line should you:

 "caused by: java.lang.classnotfoundexception: didn't find class     "com.vitarkasolutions.tracker.mainactivity" on path: dexpathlist[[zip file     "/data/app/com.vitarkasolutions.tracker-2.apk"],nativelibrarydirectories=[/data/app-    lib/com.vitarkasolutions.tracker-2, /vendor/lib, /system/lib]]"

and here answer


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