java - MainActivity is not public -


i getting weird error in androidmanifest.xml file saying "mainactivity not public. validate resource reference inside android xml files." not know how solve error. can me here?

androidmanifest.xml

    <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.pixalstudio.javaclasses" >      <uses-permission android:name="android.permission.access_network_state" >     </uses-permission>      <application         android:allowbackup="true"         android:icon="@mipmap/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>         <activity             android:name=".what_is_java"             android:label="@string/title_activity_what_is_java" >         </activity>     </application>  </manifest>

mainactivity.java

    package com.pixalstudio.javaclasses;  import android.content.intent; import android.content.res.configuration; import android.net.connectivitymanager; import android.net.networkinfo; import android.os.bundle; import android.support.v4.widget.drawerlayout; import android.support.v7.app.actionbaractivity; import android.support.v7.app.actionbardrawertoggle; import android.support.v7.widget.toolbar; import android.view.layoutinflater; import android.view.menu; import android.view.menuitem; import android.view.view; import android.view.viewgroup; import android.widget.adapterview; import android.widget.arrayadapter; import android.widget.listview; import android.widget.toast;   class mainactivity extends actionbaractivity implements adapterview.onitemclicklistener {      private toolbar toolbar;     listview mdrawerlist;     drawerlayout mdrawerlayout;     actionbardrawertoggle mdrawertoggle;     string[] mdrawerlistitems;     string[] mdrawerlistitems2;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          connectivitymanager cmanager = (connectivitymanager) getsystemservice(this.connectivity_service);         networkinfo ninfo = cmanager.getactivenetworkinfo();         if (ninfo != null && ninfo.isconnected()) {             toast.maketext(this, "newtwrok available", toast.length_long).show();         } else {             toast.maketext(this, "network not available", toast.length_long).show();         }           toolbar = (toolbar) findviewbyid(r.id.app_bar);         setsupportactionbar(toolbar);         layoutinflater inflater = getlayoutinflater();         mdrawerlayout = (drawerlayout) findviewbyid(r.id.drawerlayout);         mdrawerlist = (listview) findviewbyid(r.id.drawerlist);         mdrawerlistitems = getresources().getstringarray(r.array.drawer_list);          viewgroup header_news = (viewgroup) inflater.inflate(r.layout.nav_header, mdrawerlist, false);         mdrawerlist.addheaderview(header_news, null, false);           mdrawerlist.setadapter(new arrayadapter<string>(this, android.r.layout.simple_list_item_1, mdrawerlistitems));         mdrawerlist.setonitemclicklistener(new adapterview.onitemclicklistener() {             @override             public void onitemclick(adapterview<?> parent, view view, int position, long id) {                 if (position == 1) {                     intent = new intent(mainactivity.this, what_is_java.class);                     startactivity(i);                 }                 mdrawerlayout.closedrawer(mdrawerlist);             }          });           mdrawertoggle = new actionbardrawertoggle(this,                 mdrawerlayout,                 toolbar,                 r.string.drawer_open,                 r.string.drawer_close) {             @override             public void ondrawerclosed(view drawerview) {                 super.ondrawerclosed(drawerview);                 invalidateoptionsmenu();                 syncstate();             }              @override             public void ondraweropened(view drawerview) {                 super.ondraweropened(drawerview);                 invalidateoptionsmenu();                 syncstate();             }         };         mdrawerlayout.setdrawerlistener(mdrawertoggle);         setsupportactionbar(toolbar);         getsupportactionbar().setdisplayhomeasupenabled(true);         getsupportactionbar().sethomebuttonenabled(true);         mdrawertoggle.syncstate();     }      @override     public void onpostcreate(bundle savedinstancestate) {         super.onpostcreate(savedinstancestate);         mdrawertoggle.syncstate();     }      @override     public void onconfigurationchanged(configuration newconfig) {         super.onconfigurationchanged(newconfig);         mdrawertoggle.syncstate();     }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.menu_main, menu);         return true;     }      @override     public boolean onoptionsitemselected(menuitem item) {          switch (item.getitemid()) {             case android.r.id.home: {                 if (mdrawerlayout.isdraweropen(mdrawerlist)) {                     mdrawerlayout.closedrawer(mdrawerlist);                 } else {                     mdrawerlayout.opendrawer(mdrawerlist);                 }                 return true;             }             default:                 return super.onoptionsitemselected(item);         }       }      @override     public void onitemclick(adapterview<?> parent, view view, int position, long id) {          if (position == 2) {             intent = new intent(this, what_is_java.class);             startactivity(i);         }         mdrawerlayout.closedrawer(mdrawerlist);     } }

activity_main.xml

    <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"      android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical">      <include         android:id="@+id/app_bar"         layout="@layout/app_bar">      </include>       <android.support.v4.widget.drawerlayout         android:id="@+id/drawerlayout"         android:layout_width="match_parent"         android:layout_height="match_parent">          <framelayout             android:id="@+id/content_frame"             android:layout_width="match_parent"             android:layout_height="match_parent">          </framelayout>           <listview             android:id="@+id/drawerlist"             android:layout_width="240dp"             android:layout_height="match_parent"             android:layout_gravity="start"             android:background="#ce93d8">          </listview>       </android.support.v4.widget.drawerlayout> </linearlayout>

change class mainactivity [...] public class mainactivity [...] in mainactivity.java


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