java - How to add navigation drawer on pre built app? -

i new android development. have built app without navigation drawer. now, want add navigation drawer same across activities in app. me on issue.

assuming original activities extending 'appcompatactivity', make base activity following , extend other activities 'baseactivity'. baseactivity layout content drawaerlayout , 1 framelayout. inside baseactivity ovveride setcontentview method , inflat activity layout inside framelayout.

baseactivity.java

public class baseactivity extends appcompatactivity implements navigationview.onnavigationitemselectedlistener {       private framelayout baselayout;     public actionbardrawertoggle drawertoggle;     public toolbar toolbar;      @override     protected void oncreate(@nullable bundle savedinstancestate) {         super.oncreate(savedinstancestate);         super.setcontentview(r.layout.base_layout);         toolbar = (toolbar) findviewbyid( r.id.toolbar);         setsupportactionbar(toolbar);         baselayout = (framelayout) findviewbyid(r.id.base_view);         navigationview navigationview = (navigationview) findviewbyid(r.id.navigation_view);         drawerlayout drawerlayout = (drawerlayout) findviewbyid(r.id.drawer_layout);         navigationview.setnavigationitemselectedlistener(this);         drawertoggle = new actionbardrawertoggle(this, drawerlayout, toolbar, 0, 0);         drawerlayout.adddrawerlistener(drawertoggle);     }      @override     public void setcontentview(view view) {         if (baselayout != null) {             viewgroup.layoutparams params = new viewgroup.layoutparams(                     viewgroup.layoutparams.match_parent,                     viewgroup.layoutparams.match_parent);             baselayout.addview(view, params);         }     }      @override     public void setcontentview(view view, viewgroup.layoutparams params) {         if (baselayout != null) {             baselayout.addview(view, params);         }     }      @override     public boolean onnavigationitemselected(@nonnull menuitem item) {         //todo         return false;     } } 

base_layout.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.drawerlayout 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:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitssystemwindows="true"     tools:opendrawer="start">      <linearlayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical">          <android.support.design.widget.appbarlayout             style="@style/widget.myapp.toolbar.solid"             android:layout_width="match_parent"             android:layout_height="wrap_content"      >              <android.support.v7.widget.toolbar                 android:id="@+id/toolbar"                 android:layout_width="match_parent"                 android:layout_height="?attr/actionbarsize"                 android:background="?attr/colorprimary">               </android.support.v7.widget.toolbar>            </android.support.design.widget.appbarlayout>          <framelayout             android:id="@+id/base_view"             android:layout_width="match_parent"             android:layout_height="match_parent" />     </linearlayout>      <android.support.design.widget.navigationview         android:id="@+id/navigation_view"         android:layout_width="280sp"         android:layout_height="match_parent"         android:layout_gravity="start"         android:fitssystemwindows="true"         app:headerlayout="@layout/base_header"         app:menu="@menu/drawer" /> </android.support.v4.widget.drawerlayout> 

base_header.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.constraintlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     android:layout_width="match_parent"     android:layout_height="@dimen/nav_header_height"     android:background="@drawable/blank"     android:orientation="vertical">      <imageview         android:id="@+id/nav_header_icon"         android:layout_width="50sp"         android:layout_height="50sp"         android:layout_marginbottom="8dp"         android:layout_marginstart="16sp"         android:contentdescription="@null"         android:src="@mipmap/ic_launcher"         app:layout_constraintbottom_totopof="@+id/nav_header_title"         app:layout_constraintstart_tostartof="parent" />      <textview         android:id="@+id/nav_header_title"         android:layout_width="0dp"         android:layout_height="wrap_content"         android:layout_marginend="16sp"         android:layout_marginstart="16sp"         android:fontfamily="sans-serif-medium"         android:text="@string/app_name"         app:layout_constraintbottom_totopof="@+id/nav_header_subtitle"         app:layout_constraintend_toendof="parent"         app:layout_constraintstart_tostartof="parent" />      <textview         android:id="@+id/nav_header_subtitle"         android:layout_width="0dp"         android:layout_height="wrap_content"         android:layout_marginbottom="8dp"         android:layout_marginend="16sp"         android:layout_marginstart="16sp"         android:fontfamily="sans-serif"         android:text="@string/app_name"         app:layout_constraintbottom_tobottomof="parent"         app:layout_constraintend_toendof="parent"         app:layout_constraintstart_tostartof="parent" /> </android.support.constraint.constraintlayout> 

add drawer.xml in "menu" folder in resources.

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"     android:checkablebehavior="single">     <item         android:id="@+id/nav_home"         android:icon="@drawable/icon_home"         android:title="home" />   </menu>