Android Java.Lang.RuntimeException : Unable to start activity Component Info -

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i'm new in android programmer. recently, trying make project using google map v2 in android app, i'm getting lot of error (i have add google play services library , find similar topic in here, not solved problem).please see log cat bellow :

updated

 03-22 13:52:29.331: e/androidruntime(17708): fatal exception: main 03-22 13:52:29.331: e/androidruntime(17708): java.lang.runtimeexception: unable resume activity {com.yai.testmap/com.yai.testmap.mainactivity}: java.lang.nullpointerexception 03-22 13:52:29.331: e/androidruntime(17708):    @ android.app.activitythread.performresumeactivity(activitythread.java:2613) 03-22 13:52:29.331: e/androidruntime(17708):    @ android.app.activitythread.handleresumeactivity(activitythread.java:2641) 03-22 13:52:29.331: e/androidruntime(17708):    @ android.app.activitythread.handlelaunchactivity(activitythread.java:2127) 03-22 13:52:29.331: e/androidruntime(17708):    @ android.app.activitythread.access$600(activitythread.java:140) 03-22 13:52:29.331: e/androidruntime(17708):    @ android.app.activitythread$h.handlemessage(activitythread.java:1228) 03-22 13:52:29.331: e/androidruntime(17708):    @ android.os.handler.dispatchmessage(handler.java:99) 03-22 13:52:29.331: e/androidruntime(17708):    @ android.os.looper.loop(looper.java:137) 03-22 13:52:29.331: e/androidruntime(17708):    @ android.app.activitythread.main(activitythread.java:4895) 03-22 13:52:29.331: e/androidruntime(17708):    @ java.lang.reflect.method.invokenative(native method) 03-22 13:52:29.331: e/androidruntime(17708):    @ java.lang.reflect.method.invoke(method.java:511) 03-22 13:52:29.331: e/androidruntime(17708):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:994) 03-22 13:52:29.331: e/androidruntime(17708):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:761) 03-22 13:52:29.331: e/androidruntime(17708):    @ dalvik.system.nativestart.main(native method) 03-22 13:52:29.331: e/androidruntime(17708): caused by: java.lang.nullpointerexception 03-22 13:52:29.331: e/androidruntime(17708):    @ com.yai.testmap.mainactivity.setupmapifneeded(mainactivity.java:93) 03-22 13:52:29.331: e/androidruntime(17708):    @ com.yai.testmap.mainactivity.onresume(mainactivity.java:187) 03-22 13:52:29.331: e/androidruntime(17708):    @ android.app.instrumentation.callactivityonresume(instrumentation.java:1199) 03-22 13:52:29.331: e/androidruntime(17708):    @ android.app.activity.performresume(activity.java:5237) 03-22 13:52:29.331: e/androidruntime(17708):    @ android.app.activitythread.performresumeactivity(activitythread.java:2603) 03-22 13:52:29.331: e/androidruntime(17708):    ... 12 more

update

my mainactivity.java :

 package com.yai.testmap;  import android.support.v7.app.actionbaractivity; import android.support.v4.app.fragment; import android.os.bundle; import android.view.layoutinflater; import android.view.menu; import android.view.menuitem; import android.view.view; import android.view.viewgroup;  /* error repport */ import android.util.log;  /* import dropdownlist used project */ import android.widget.checkbox; import android.widget.spinner; import android.widget.toast; import android.widget.adapterview; import android.widget.arrayadapter; import android.widget.adapterview.onitemselectedlistener;  /* import google map */ import com.google.android.gms.maps.googlemap; import com.google.android.gms.maps.supportmapfragment;  /* google map type */ import static com.google.android.gms.maps.googlemap.map_type_hybrid; import static com.google.android.gms.maps.googlemap.map_type_none; import static com.google.android.gms.maps.googlemap.map_type_normal; import static com.google.android.gms.maps.googlemap.map_type_satellite; import static com.google.android.gms.maps.googlemap.map_type_terrain;  class placeholderfragment extends fragment implements onitemselectedlistener{     private googlemap mgooglemap;     private checkbox mtrafficcheckbox, mlocationcheckbox, mbuildingcheckbox, mindoorcheckbox;      public placeholderfragment() {     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     view rootview = inflater.inflate(r.layout.fragment_main, container, false);      spinner spinner = (spinner) rootview.findviewbyid(r.id.spinneroption);     arrayadapter adapter = arrayadapter.createfromresource(getactivity(), r.array.spinner_option_string, android.r.layout.simple_spinner_item);     adapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item);     spinner.setadapter(adapter);     spinner.setonitemselectedlistener((onitemselectedlistener) getactivity());      mtrafficcheckbox = (checkbox) rootview.findviewbyid(r.id.checkbox_traffic);     mlocationcheckbox = (checkbox) rootview.findviewbyid(r.id.checkbox_location);     mbuildingcheckbox = (checkbox) rootview.findviewbyid(r.id.checkbox_building);     mindoorcheckbox = (checkbox) rootview.findviewbyid(r.id.checkbox_indoor);          return rootview;     }      @override     public void onitemselected(adapterview parent, view view, int position,             long id) {         // todo auto-generated method stub      }     @override     public void onnothingselected(adapterview parent) {         // todo auto-generated method stub      } }   public class mainactivity extends actionbaractivity implements onitemselectedlistener {     private googlemap mgooglemap;     private checkbox mtrafficcheckbox, mlocationcheckbox, mbuildingcheckbox, mindoorcheckbox;      @override     protected void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);                   if (savedinstancestate == null) {             getsupportfragmentmanager().begintransaction()                     .add(r.id.container, new placeholderfragment()).commit();         }        }         private void setupmapifneeded(){         if(mgooglemap == null){             mgooglemap = ((supportmapfragment) getsupportfragmentmanager().findfragmentbyid(r.id.map)).getmap();         }     }      private boolean checkready(){         if(mgooglemap == null){             toast.maketext(this, r.string.map_not_ready, toast.length_short).show();             return false;         }         return true;     }      private void updatetraffic(){         if(!checkready()){             return;         }         mgooglemap.settrafficenabled(mtrafficcheckbox.ischecked());     }      public void ontraffictoggled(view view){         updatetraffic();     }      private void updatelocation(){         if(!checkready()){             return;         }         mgooglemap.setmylocationenabled(mlocationcheckbox.ischecked());     }      public void onlocationtoggled(view view){         updatelocation();     }      private void updatebuilding(){         if(!checkready()){             return;         }         mgooglemap.setbuildingsenabled(mbuildingcheckbox.ischecked());     }      public void onbuildingtoggled(view view){         updatebuilding();     }      private void updateindoor(){         if(!checkready()){             return;         }         mgooglemap.setindoorenabled(mindoorcheckbox.ischecked());     }      public void onindoortoggled(view view){         updateindoor();     }      @override     public void onitemselected(adapterview parent, view view, int position, long id){          setlayer((string) parent.getitematposition(position));     }      private void setlayer(string layername){         if(!checkready()){             return;         }          if(layername.equals(getstring(r.string.normal))){             mgooglemap.setmaptype(map_type_normal);         }         else if(layername.equals(getstring(r.string.hybrid))){             mgooglemap.setmaptype(map_type_hybrid);         }         else if(layername.equals(getstring(r.string.satellite))){             mgooglemap.setmaptype(map_type_satellite);         }         else if(layername.equals(getstring(r.string.terrain))){             mgooglemap.setmaptype(map_type_terrain);         }         else if(layername.equals(getstring(r.string.none_map))){             mgooglemap.setmaptype(map_type_none);         }         else{             log.i("lda", "error setting layer name " + layername);         }     }      @override     public void onnothingselected(adapterview parent){      }      @override     protected void onresume() {         super.onresume();         setupmapifneeded();         if (mgooglemap != null) {             updatetraffic();             updatelocation();             updatebuilding();             updateindoor();         }     }        @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);     }      /**      * placeholder fragment containing simple view.      */     public static class placeholderfragment extends fragment {          public placeholderfragment() {         }          @override         public view oncreateview(layoutinflater inflater, viewgroup container,                 bundle savedinstancestate) {             view rootview = inflater.inflate(r.layout.fragment_main, container,                     false);             return rootview;         }     }  }

i'm using fragment here, here fragment_main.xml :

<?xml version="1.0" encoding="utf-8" ?> 

    <spinner         android:id="@+id/spinneroption"         android:layout_width="match_parent"         android:layout_height="wrap_content" />      <checkbox          android:id="@+id/checkbox_traffic"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:onclick="ontraffictoggled"         android:text="@string/traffic" />      <checkbox         android:id="@+id/checkbox_location"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:onclick="onlocationtoggled"         android:text="@string/location" />      <checkbox         android:id="@+id/checkbox_building"         android:layout_width="wrap_content"         android:layout_height="wrap_content"          android:onclick="onbuildingstoggled"         android:checked="true"         android:text="@string/building" />      <checkbox         android:id="@+id/checkbox_indoor"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:onclick="onindoortoggled"         android:checked="true"         android:text="@string/indoor" /> </linearlayout> </relativelayout>

and manifest

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.yai.testmap" android:versioncode="1" android:versionname="1.0" >  <uses-sdk     android:minsdkversion="9"     android:targetsdkversion="17" />  <uses-permission android:name="android.permission.internet" /> <uses-permission android:name="android.permission.access_network_state" /> <uses-permission android:name="android.permission.write_external_storage" /> <uses-permission android:name="com.google.android.providers.gsf.permission.read_gservices" /> <uses-permission android:name="android.permission.access_coarse_location" /> <uses-permission android:name="android.permission.access_fine_location" />  <uses-feature     android:glesversion="0x00020000"     android:required="true" />  <application     android:allowbackup="true"     android:icon="@drawable/ic_launcher"     android:label="@string/app_name"     android:theme="@style/apptheme" >      <meta-data         android:name="com.google.android.gms.version"         android:value="@integer/google_play_services_version"      />      <activity         android:name="com.yai.testmap.mainactivity"         android:label="@string/app_name" >         <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.maps.v2.api_key"         android:value="super screet code"         /> </application>  </manifest>

here activity_main.xml :

<framelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.yai.testmap.mainactivity" tools:ignore="mergerootframe" />

i'm curious spinner , function setupmapifneeded(), because when i'm commenting parts of code, app work. miss? idea? many thanks.

try this..

remove spinner , checkbox mainactivity placeholderfragment below 

public static class placeholderfragment extends fragment implements onitemselectedlistener{      public placeholderfragment() {     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container,             bundle savedinstancestate) {         view rootview = inflater.inflate(r.layout.fragment_main, container,                 false);      spinner spinner = (spinner) rootview.findviewbyid(r.id.spinneroption);     arrayadapter adapter = arrayadapter.createfromresource(getactivity(), r.array.spinner_option_string, android.r.layout.simple_spinner_item);     adapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item);     spinner.setadapter(adapter);     spinner.setonitemselectedlistener(getactivity());      mtrafficcheckbox = (checkbox) rootview.findviewbyid(r.id.checkbox_traffic);     mlocationcheckbox = (checkbox) rootview.findviewbyid(r.id.checkbox_location);     mbuildingcheckbox = (checkbox) rootview.findviewbyid(r.id.checkbox_building);     mindoorcheckbox = (checkbox) rootview.findviewbyid(r.id.checkbox_indoor);          return rootview;     } }

and 

@override protected void oncreate(bundle savedinstancestate) {         /* create option dropdown list*/     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      if (savedinstancestate == null) {         getsupportfragmentmanager().begintransaction()                 .add(r.id.container, new placeholderfragment()).commit();     }    }

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