Android app getting unfortunately closed using google maps -

trying search places entering name in android app google maps app unfortunately getting closed. helpful.

mainactivity.java file   import android.location.address; import android.location.geocoder; import android.os.asynctask; import android.os.bundle; import android.support.v4.app.fragmentactivity; import android.view.menu; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.edittext; import android.widget.toast;  import com.google.android.gms.maps.cameraupdatefactory; import com.google.android.gms.maps.googlemap; import com.google.android.gms.maps.supportmapfragment; import com.google.android.gms.maps.model.latlng; import com.google.android.gms.maps.model.markeroptions;  import java.io.ioexception; import java.util.list;   public class mainactivity extends fragmentactivity { googlemap googlemap; markeroptions markeroptions; latlng latlng;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     supportmapfragment supportmapfragment = (supportmapfragment)             getsupportfragmentmanager().findfragmentbyid(r.id.map);      // getting reference map     googlemap = supportmapfragment.getmap();      // getting reference btn_find of layout activity_main     button btn_find = (button) findviewbyid(r.id.btn_find);      // defining button click event listener find button     onclicklistener findclicklistener = new onclicklistener() {         @override         public void onclick(view v) {             // getting reference edittext user input location             edittext etlocation = (edittext) findviewbyid(r.id.et_location);              // getting user input location             string location = etlocation.gettext().tostring();              if(location!=null && !location.equals("")){                 new geocodertask().execute(location);             }         }     };      // setting button click event listener find button     btn_find.setonclicklistener(findclicklistener);   }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.menu_main, menu);     return true; }   // asynctask class accessing geocoding web service private class geocodertask extends asynctask<string, void, list<address>>{      @override     protected list<address> doinbackground(string... locationname) {         // creating instance of geocoder class         geocoder geocoder = new geocoder(getbasecontext());         list<address> addresses = null;          try {             // getting maximum of 3 address matches input text             addresses = geocoder.getfromlocationname(locationname[0], 3);         } catch (ioexception e) {             e.printstacktrace();         }         return addresses;     }       @override     protected void onpostexecute(list<address> addresses) {          if(addresses==null || addresses.size()==0){             toast.maketext(getbasecontext(), "no location found", toast.length_short).show();         }          // clears existing markers on map         googlemap.clear();          // adding markers on google map each matching address         for(int i=0;i<addresses.size();i++){              address address = (address) addresses.get(i);              // creating instance of geopoint, display in google map             latlng = new latlng(address.getlatitude(), address.getlongitude());              string addresstext = string.format("%s, %s",                     address.getmaxaddresslineindex() > 0 ? address.getaddressline(0) : "",                     address.getcountryname());              markeroptions = new markeroptions();             markeroptions.position(latlng);             markeroptions.title(addresstext);              googlemap.addmarker(markeroptions);              // locate first location             if(i==0)                         googlemap.animatecamera(cameraupdatefactory.newlatlng(latlng));         }     } }   } 

and activivity_main.xml file

<linearlayout 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:orientation="vertical" tools:context=".mainactivity" >  <relativelayout     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:orientation="horizontal" >      <button         android:id="@+id/btn_find"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="@string/str_btn_find"         android:layout_alignparentright="true" />      <edittext         android:id="@+id/et_location"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:inputtype="text"         android:hint="@string/hnt_et_location"         android:layout_toleftof="@id/btn_find" />  </relativelayout>  <fragment xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/map"     android:layout_width="match_parent"     android:layout_height="357dp"     android:name="com.google.android.gms.maps.supportmapfragment"     /> 

manifest.xml

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

<uses-permission android:name="com.example.hp.restart.permission.maps_receive" />  <permission     android:name="com.example.hp.restart.permission.maps_receive"     android:protectionlevel="signature" />  <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" />  <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" >     <activity         android:name=".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="aizasybviuuvtvswhshqtndgqtcmxgx9su"/>  </application> 

so when open app opening google map gets appear there search there app gets closed unfortunately can please me find out