How to remove title bar from the android activity? -

can please me issue.i want activity full screen , want remove title screen.i have tried several ways not able remove it.

activity code :

    public class welcomepage extends activity {     private button btn;     edittext username,password;     databasehandler dbhandler;     context ctx =this;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         //remove title bar         this.requestwindowfeature(window.feature_no_title);         setcontentview(r.layout.activity_welcomepage); } } 

and activity.xml

    <?xml version="1.0" encoding="utf-8"?>    <relativelayout    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:paddingbottom="@dimen/activity_vertical_margin"     android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin"     android:background="@drawable/pic1"     app:layout_behavior="@string/appbar_scrolling_view_behavior"     tools:context="com.edkul.vimal.edkul.welcomepage">    </relativelayout> 

i want remove title bar displayed in blue color .please find image reference :

androidmanifest.xml

<application         android:minsdkversion="3"         android:allowbackup="true"         android:icon="@mipmap/ic_launcher"         android:label="@string/app_name"         android:supportsrtl="true"         android:theme="@style/theme.appcompat.noactionbar">         <activity             android:name=".welcomepage"             android:label="@string/app_name"             android:theme="@style/theme.appcompat.noactionbar">             <intent-filter>                 <action android:name="android.intent.action.main" />                 <category    android:name="android.intent.category.launcher" />             </intent-filter>         </activity> </application> 

you add style in style folder

<style name="apptheme.noactionbar" parent="theme.appcompat.light.darkactionbar">     <item name="windowactionbar">false</item>     <item name="windownotitle">true</item>     <item name="android:windowfullscreen">true</item> </style> 

set style activity class in androidmanifest.xml file

android:theme="@style/apptheme.noactionbar" 

i hope you