Error inflating class fragment. Must specify unique android:id, android:tag, or have a parent with an id -

i trying run fragment application keeps on crashing when run it. trying load main activity can display webview in having no luck.

mainactivity

import android.os.bundle; import android.support.v4.app.fragmentactivity;  public class mainactivity extends fragmentactivity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);     } } 

fragment code

import android.app.fragment; import android.os.bundle; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.webkit.websettings; import android.webkit.webview;  public class webviewfragment extends fragment {      private webview mwebview;      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {          view view = inflater.inflate(r.layout.fragment_main, container, false);         mwebview = (webview) view.findviewbyid(r.id.webview);         websettings websettings = mwebview.getsettings();         websettings.setjavascriptenabled(true);         mwebview.loadurl("https://www.google.co.uk/");          return view;     } } 

manifest

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.example.bashirsentongo.webviewapp">     <uses-permission android:name="android.permission.internet"/>      <application         android:allowbackup="true"         android:icon="@mipmap/ic_launcher"         android:label="@string/app_name"         android:supportsrtl="true"         android:theme="@style/apptheme">         <activity android:name=".mainactivity">             <intent-filter>                 <action android:name="android.intent.action.main" />                  <category android:name="android.intent.category.launcher" />             </intent-filter>         </activity>      </application>  </manifest> 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <relativelayout 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:paddingbottom="@dimen/activity_vertical_margin"     android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin"     tools:context="com.example.bashirsentongo.webviewapp.mainactivity">      <textview         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="hello world!" />      <fragment         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_weight="1"         class="com.example.bashirsentongo.webviewapp.webviewfragment"/> </relativelayout> 

fragment_main.xml

<framelayout 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"     tools:context="layout.main">      <textview         android:layout_width="match_parent"         android:layout_height="match_parent"         android:text="@string/hello_blank_fragment" />      <webview         android:layout_width="match_parent"         android:layout_height="match_parent"         android:id="@+id/webview"/>     /> </framelayout> 

from official documentation:

note: each fragment requires unique identifier system can use restore fragment if activity restarted (and can use capture fragment perform transactions, such remove it). there 3 ways provide id fragment:  supply android:id attribute unique id. supply android:tag attribute unique string. if provide neither of previous two, system uses id of container view. 

https://developer.android.com/guide/components/fragments.html

also find example here using id fragment:

<fragment android:name="com.example.news.articlelistfragment"         android:id="@+id/list"         android:layout_weight="1"         android:layout_width="0dp"         android:layout_height="match_parent" />