java - NullPointerException at mapFragment.getMapAsync -

after going through questions relating title, couldn't find solution problem. having nullpointerexception @ mapfragment.getmapasync. below mapactivity code.

package com.example.jerofad.mylocation; import android.app.fragmentmanager; import android.support.v4.app.fragmentactivity; import android.os.bundle; import com.google.android.gms.maps.cameraupdatefactory; import com.google.android.gms.maps.googlemap; import com.google.android.gms.maps.onmapreadycallback; import com.google.android.gms.maps.supportmapfragment; import com.google.android.gms.maps.model.latlng; import com.google.android.gms.maps.model.markeroptions; public class mapsactivity extends fragmentactivity implements  onmapreadycallback {     private googlemap mmap;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_maps);         // obtain supportmapfragment , notified when map ready used.         supportmapfragment mapfragment = (supportmapfragment) this.getsupportfragmentmanager()                 .findfragmentbyid(r.id.map);         mapfragment.getmapasync(this);     }      @override     public void onmapready(googlemap googlemap) {         mmap = googlemap;         // add marker in sydney , move camera         latlng sydney = new latlng(-34, 151);         mmap.addmarker(new markeroptions().position(sydney).title("marker in sydney"));         mmap.movecamera(cameraupdatefactory.newlatlng(sydney));         mmap.getuisettings().setzoomcontrolsenabled(true);     } } 

i using google play service 8.4.0. android manifest given below.

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.jerofad.mylocation">  <!--      access_coarse/fine_location permissions not required use      google maps android api v2, must specify either coarse or fine      location permissions 'mylocation' functionality.  --> <uses-permission android:name="android.permission.access_fine_location" /> <uses-permission android:name="android.permission.access_coarse_location"/> <uses-permission android:name="android.permission.access_network_state" /> <uses-permission android:name="android.permission.internet" /> <uses-permission android:name="com.google.android.providers.gsf.permission.read_gservices" /> <uses-permission android:name="android.permission.write_external_storage"     android:maxsdkversion="22"/> <permission     android:name="com.example.jerofad.mylocation.permission.maps_receive"     android:protectionlevel="signature" /> <uses-permission android:name="com.example.jerofad.mylocation.permission.maps_receive" /> <uses-permission     android:name="android.permission.read_external_storage"     android:maxsdkversion="22" /> <uses-feature     android:glesversion="0x00020000"     android:required="true" />  <application     android:allowbackup="true"     android:icon="@drawable/mylocation"     android:label="@string/app_name"     android:supportsrtl="true"     android:theme="@style/apptheme">             <meta-data         android:name="com.google.android.geo.api_key"         android:value="@string/google_maps_key" />     <meta-data         android:name="com.google.android.gms.version"         android:value="@integer/google_play_services_version" />      <activity         android:name=".mapsactivity"         android:label="@string/title_activity_maps">      </activity>     <activity         android:name=".launcheractivity"         android:label="@string/title_activity_launcher"         android:theme="@style/apptheme.noactionbar">         <intent-filter>             <action android:name="android.intent.action.main" />             <category android:name="android.intent.category.launcher" />         </intent-filter>     </activity> </application> 

how can fix error @ mapfragment.getmapasync(this). in advance. here crash log.

04-25 11:11:49.079 31448-31448/com.example.jerofad.mylocation  e/androidruntime: fatal exception: main process: com.example.jerofad.mylocation, pid: 31448 java.lang.runtimeexception: unable start activity componentinfo{com.example.jerofad.mylocation/com.example.jerofad.mylocation.mapsactivity}: java.lang.nullpointerexception    @ android.app.activitythread.performlaunchactivity(activitythread.java:2338)    @ android.app.activitythread.handlelaunchactivity(activitythread.java:2390)    @ android.app.activitythread.access$800(activitythread.java:151)    @ android.app.activitythread$h.handlemessage(activitythread.java:1321)    @ android.os.handler.dispatchmessage(handler.java:110)    @ android.os.looper.loop(looper.java:193)    @ android.app.activitythread.main(activitythread.java:5299)    @ java.lang.reflect.method.invokenative(native method)    @ java.lang.reflect.method.invoke(method.java:515)    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:825)    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:641)    @ dalvik.system.nativestart.main(native method) caused by: java.lang.nullpointerexception    @ com.example.jerofad.mylocation.mapsactivity.oncreate(mapsactivity.java:24)    @ android.app.activity.performcreate(activity.java:5423)    @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1088)    @ android.app.activitythread.performlaunchactivity(activitythread.java:2302)    @ android.app.activitythread.handlelaunchactivity(activitythread.java:2390)     @ android.app.activitythread.access$800(activitythread.java:151)     @ android.app.activitythread$h.handlemessage(activitythread.java:1321)     @ android.os.handler.dispatchmessage(handler.java:110)     @ android.os.looper.loop(looper.java:193)     @ android.app.activitythread.main(activitythread.java:5299)     @ java.lang.reflect.method.invokenative(native method)     @ java.lang.reflect.method.invoke(method.java:515)     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:825)     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:641)     @ dalvik.system.nativestart.main(native method) 

here activity_maps.xml.

<?xml version="1.0" encoding="utf-8"?> <fragment xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/map"     class ="com.google.android.gms.maps.mapfragment"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:name="com.example.jerofad.mylocation.mapsactivity" /> 

please try this,

remove/comment supportmapfragment line while , try this,

mapfragment mapfragment = (mapfragment) getfragmentmanager() .findfragmentbyid(r.id.map);