Android application crashes when open map activity for multiple location -

i want show multiple location in map activity, every thing ok. cannot sun application. crashes when run on emulator. logcat error show :

java.lang.runtimeexception: unable start activity         componentinfo{daffodilvarsity.edu.bd.studentportal/daffodilvarsity.edu.bd.studentportal.locationsharemapsactivity}: java.lang.nullpointerexception:     attempt invoke virtual method 'com.google.android.gms.maps.model.marker     com.google.android.gms.maps.googlemap.addmarker(com.google.android.gms.map s.model.markeroptions)' on null object reference 

this gradle.build file

 apply plugin: 'com.android.application'  android {  compilesdkversion 23  buildtoolsversion "24.0.1"  uselibrary 'org.apache.http.legacy'   dexoptions {     incremental true     javamaxheapsize "2048m"  }   defaultconfig {     applicationid "daffodilvarsity.edu.bd.studentportal"     minsdkversion 14     targetsdkversion 23     versioncode 1     versionname "1.0"     multidexenabled true   }  buildtypes {     release {         minifyenabled false         proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'     }   }   }    dependencies {   compile filetree(dir: 'libs', include: ['*.jar'])   testcompile 'junit:junit:4.12'   compile 'com.android.support:appcompat-v7:23.4.0'   compile 'com.android.support:design:23.4.0'   compile 'com.google.android.gms:play-services:9.2.1'   compile 'org.apache.httpcomponents:httpcore:4.4.1'   compile 'com.loopj.android:android-async-http:1.4.9'   } 

this andridmanifest.xml file

  <?xml version="1.0" encoding="utf-8"?>   <manifest xmlns:android="http://schemas.android.com/apk/res/android"   package="daffodilvarsity.edu.bd.studentportal">    <uses-feature     android:glesversion="0x00020000"     android:required="true"/>    <uses-permission android:name="android.permission.internet"></uses-permission>   <uses-permission android:name="android.permission.access_network_state"></uses-permission>   <uses-permission android:name="android.permission.write_external_storage"></uses-permission>   <uses-permission android:name="android.permission.access_fine_location" />   <uses-permission android:name="android.permission.access_coarse_location" />   <uses-permission android:name="com.google.android.providers.gsf.permission.read_gservices" />   <uses-permission    android:name="android.permission.read_external_storage" />   <uses-permission android:name="android.permission.get_accounts" />    <permission     android:name="com.example.mapexdemo.permission.maps_receive"     android:protectionlevel="signature" />    <application     android:allowbackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:supportsrtl="true"     android:theme="@style/apptheme">     <activity         android:name=".locationsharemapsactivity"         android:label="@string/title_activity_location_share_maps" />         <intent-filter>             <action android:name="android.intent.action.main" />             <category android:name="android.intent.category.launcher" />         </intent-filter>     </activity>     <meta-data         android:name="com.google.android.gms.vision"         android:value="6587000" />     <meta-data         android:name="com.google.android.maps.v2.api_key"         android:value="aizasycbe_7ackavlmrirygwrsvo-lhpv-vtbsy" />   </application>   </manifest> 

this activity_location_share_maps.xml layout file

  <fragment xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:map="http://schemas.android.com/apk/res-auto"   xmlns:tools="http://schemas.android.com/tools"   android:id="@+id/map"   android:name="com.google.android.gms.maps.supportmapfragment"   android:layout_width="match_parent"   android:layout_height="match_parent" tools:context="daffodilvarsity.edu.bd.studentportal.locationsharemapsactivity" /> 

infowindow_layout.xml file

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/marker_layout" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="wrap_content">  <linearlayout     android:id="@+id/station_info_layout"     android:layout_width="205dp"     android:layout_height="wrap_content"     android:orientation="horizontal" >          <imageview             android:id="@+id/marker_icon"             android:layout_width="wrap_content"             android:layout_height="wrap_content"/>          <textview             android:id="@+id/marker_label"             android:layout_marginleft="5dp"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:textstyle="bold" />  </linearlayout>  <textview     android:id="@+id/another_label"     android:layout_marginleft="5dp"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:textstyle="bold" />  </linearlayout> 

locationsharemapsactivity.java file

package daffodilvarsity.edu.bd.studentportal; import android.os.bundle; import android.support.v4.app.fragmentactivity; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.imageview; import android.widget.textview; import android.widget.toast; 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.bitmapdescriptorfactory; import com.google.android.gms.maps.model.latlng; import com.google.android.gms.maps.model.marker; import com.google.android.gms.maps.model.markeroptions; import java.util.arraylist; import java.util.hashmap;  public class locationsharemapsactivity extends fragmentactivity implements onmapreadycallback {  private googlemap mmap; private arraylist<mymarker> mmymarkersarray = new arraylist<mymarker>(); private hashmap<marker, mymarker> mmarkershashmap;  public locationsharemapsactivity() {     //empty public constructor }  @override public void oncreate(bundle savedinstancestate){     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_location_share_maps);      // initialize hashmap markers , mymarker object     mmarkershashmap = new hashmap<marker, mymarker>();      mmymarkersarray.add(new mymarker("brasil", "icon1", double.parsedouble("-28.5971788"), double.parsedouble("-52.7309824")));     mmymarkersarray.add(new mymarker("united states", "icon2", double.parsedouble("33.7266622"), double.parsedouble("-87.1469829")));     mmymarkersarray.add(new mymarker("canada", "icon3", double.parsedouble("51.8917773"), double.parsedouble("-86.0922954")));     mmymarkersarray.add(new mymarker("england", "icon4", double.parsedouble("52.4435047"), double.parsedouble("-3.4199249")));     mmymarkersarray.add(new mymarker("españa", "icon5", double.parsedouble("41.8728262"), double.parsedouble("-0.2375882")));     mmymarkersarray.add(new mymarker("portugal", "icon6", double.parsedouble("40.8316649"), double.parsedouble("-4.936009")));     mmymarkersarray.add(new mymarker("deutschland", "icon7", double.parsedouble("51.1642292"), double.parsedouble("10.4541194")));     mmymarkersarray.add(new mymarker("atlantic ocean", "icondefault", double.parsedouble("-13.1294607"), double.parsedouble("-19.9602353")));      setupmap();     plotmarkers(mmymarkersarray); }  private void setupmap(){     // null check confirm have not instantiated map.     if (mmap == null) {         // try obtain map supportmapfragment.         supportmapfragment mapfrag = (supportmapfragment) getsupportfragmentmanager().findfragmentbyid(r.id.map);         mapfrag.getmapasync(this);          if (mmap != null) {             mmap.setonmarkerclicklistener(new googlemap.onmarkerclicklistener(){                 @override                 public boolean onmarkerclick(com.google.android.gms.maps.model.marker marker) {                     marker.showinfowindow();                     return true;                 }             });         }         else             toast.maketext(getapplicationcontext(), "unable create maps", toast.length_short).show();     } }  @override public void onmapready(googlemap googlemap) {     mmap = googlemap;     setupmap(); }  private void plotmarkers(arraylist<mymarker> markers) {     if(markers.size() > 0) {         (mymarker mymarker : markers) {              // create user marker custom icon , other options             markeroptions markeroption = new markeroptions().position(new latlng(mymarker.getmlatitude(), mymarker.getmlongitude()));                         markeroption.icon(bitmapdescriptorfactory.fromresource(r.drawable.currentlocation_icon));              marker currentmarker = mmap.addmarker(markeroption);             mmarkershashmap.put(currentmarker, mymarker);              mmap.setinfowindowadapter(new markerinfowindowadapter());         }     } }  private int managemarkericon(string markericon) {     if (markericon.equals("icon1"))         return r.drawable.icon1;     else if(markericon.equals("icon2"))         return r.drawable.icon2;     else if(markericon.equals("icon3"))         return r.drawable.icon3;     else if(markericon.equals("icon4"))         return r.drawable.icon4;     else if(markericon.equals("icon5"))         return r.drawable.icon5;     else if(markericon.equals("icon6"))         return r.drawable.icon6;     else if(markericon.equals("icon7"))         return r.drawable.icon7;     else         return r.drawable.icondefault; }  public class markerinfowindowadapter implements googlemap.infowindowadapter {     public markerinfowindowadapter() {     }      @override     public view getinfowindow(marker marker) {         return null;     }      @override     public view getinfocontents(marker marker) {         view v  = getlayoutinflater().inflate(r.layout.infowindow_layout, null);          mymarker mymarker = mmarkershashmap.get(marker);          imageview markericon = (imageview) v.findviewbyid(r.id.marker_icon);          textview markerlabel = (textview)v.findviewbyid(r.id.marker_label);          textview anotherlabel = (textview)v.findviewbyid(r.id.another_label);          markericon.setimageresource(managemarkericon(mymarker.getmicon()));         markerlabel.settext(mymarker.getmlabel());         anotherlabel.settext("a custom text");         return v;     } } } 

mymaker.java file

package daffodilvarsity.edu.bd.studentportal; public class mymarker { private string mlabel; private string micon; private double mlatitude; private double mlongitude;  public mymarker(string label, string icon, double latitude, double longitude) {     this.mlabel = label;     this.mlatitude = latitude;     this.mlongitude = longitude;     this.micon = icon; }  public string getmlabel() {     return mlabel; }  public void setmlabel(string mlabel){     this.mlabel = mlabel; }  public string getmicon() {     return micon; }  public void setmicon(string icon) {     this.micon = icon; }  public double getmlatitude() {     return mlatitude; }  public void setmlatitude(double mlatitude) {     this.mlatitude = mlatitude; }  public double getmlongitude() {     return mlongitude; }  public void setmlongitude(double mlongitude) {     this.mlongitude = mlongitude; } } 

logcat error message:

 08-08 15:44:37.432 17002-17002/daffodilvarsity.edu.bd.studentportal e/androidruntime: fatal exception: main  process: daffodilvarsity.edu.bd.studentportal, pid: 17002  java.lang.runtimeexception: unable start activity         componentinfo{daffodilvarsity.edu.bd.studentportal/daffodilvarsity.edu.bd.studentportal.locationsharemapsactivity}: java.lang.nullpointerexception:     attempt invoke virtual method 'com.google.android.gms.maps.model.marker     com.google.android.gms.maps.googlemap.addmarker(com.google.android.gms.map s.model.markeroptions)' on null object reference  @ android.app.activitythread.performlaunchactivity(activitythread.java:2416)  @ android.app.activitythread.handlelaunchactivity(activitythread.java:2476)  @ android.app.activitythread.-wrap11(activitythread.java)  @ android.app.activitythread$h.handlemessage(activitythread.java:1344)  @ android.os.handler.dispatchmessage(handler.java:102)  @ android.os.looper.loop(looper.java:148)  @ android.app.activitythread.main(activitythread.java:5417)  @ java.lang.reflect.method.invoke(native method)  @     com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726)  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616)  caused by: java.lang.nullpointerexception: attempt invoke virtual method 'com.google.android.gms.maps.model.marker com.google.android.gms.maps.googlemap.addmarker(com.google.android.gms.maps.model.markeroptions)' on null object reference  @ daffodilvarsity.edu.bd.studentportal.locationsharemapsactivity.plotmarkers(locationsharemapsactivity.java:107)  @ daffodilvarsity.edu.bd.studentportal.locationsharemapsactivity.oncreate(locationsharemapsactivity.java:54)  @ android.app.activity.performcreate(activity.java:6237)  @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1107    )  @ android.app.activitythread.performlaunchactivity(activitythread.java:2369)  @ android.app.activitythread.handlelaunchactivity(activitythread.java:2476)   @ android.app.activitythread.-wrap11(activitythread.java)   @ android.app.activitythread$h.handlemessage(activitythread.java:1344)   @ android.os.handler.dispatchmessage(handler.java:102)   @ android.os.looper.loop(looper.java:148)   @ android.app.activitythread.main(activitythread.java:5417)   @ java.lang.reflect.method.invoke(native method)   @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726)  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616)  08-08 15:44:39.431 17002-17885/daffodilvarsity.edu.bd.studentportal     w/dynamitemodule: local module descriptor class com.google.android.gms.googlecertificates not found.     08-08 15:44:39.432 17002-17885/daffodilvarsity.edu.bd.studentportal     i/dynamitemodule: considering local module     com.google.android.gms.googlecertificates:0 , remote module     com.google.android.gms.googlecertificates:1     08-08 15:44:39.432 17002-17885/daffodilvarsity.edu.bd.studentportal     i/dynamitemodule: selected remote version of     com.google.android.gms.googlecertificates, version >= 1     08-08 15:44:39.433 17002-17885/daffodilvarsity.edu.bd.studentportal     d/chimerafileapk: primary abi of requesting process x86_64     08-08 15:44:39.433 17002-17885/daffodilvarsity.edu.bd.studentportal     d/chimerafileapk: classloading successful. optimized code found.     08-08 15:44:39.434 17002-17885/daffodilvarsity.edu.bd.studentportal     d/googlecertificates: com.google.android.gms.googlecertificates module loaded     08-08 15:44:39.460 17002-17885/daffodilvarsity.edu.bd.studentportal     d/googlecertificatesimpl: fetched 318 google certificates