navigation drawer - Android Hamburger Icon Doing Nothing -

i have been able show "hamburger" icon on toolbar, when click on it, nothing happening... way bring drawer slide left..

here's code:

@override public void oncreate(bundle savedinstancestate){     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     mtoolbar = (toolbar) findviewbyid(r.id.my_toolbar);     setsupportactionbar(mtoolbar);     getsupportactionbar().setdisplayshowhomeenabled(true);     getsupportactionbar().sethomebuttonenabled(true);      mdrayerlayout = (drawerlayout) findviewbyid(r.id.drawer_layout);     mdrayerlayout.setdrawershadow(r.drawable.drawer_shadow, gravitycompat.start);      mdrawerlist = (listview) findviewbyid(r.id.left_drawer);     mdrawerlist.setadapter(new arrayadapter<>(this, r.layout.drawer_list_item, test));     mdrawerlist.setonitemclicklistener(new drawerlistclicklistener());      mdrawertoggle = new actionbardrawertoggle(this, mdrayerlayout, r.string.navigation_drawer_open, r.string.navigation_drawer_close){         public void ondrawerclosed(view view){             super.ondrawerclosed(view);             getsupportactionbar().settitle("close");             invalidateoptionsmenu();             mdrawertoggle.syncstate();         }         public void ondraweropened(view drawerview){             super.ondrawerclosed(drawerview);             getsupportactionbar().settitle("open");             invalidateoptionsmenu();             mdrawertoggle.syncstate();         }     };     mdrawertoggle.syncstate();     mdrayerlayout.setdrawerlistener(mdrawertoggle); } 

here's xml file. don't think knows.

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/main_layout" android:layout_width="match_parent" android:layout_height="match_parent"> <!-- toolbar --> <android.support.v7.widget.toolbar xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/my_toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionbarsize" android:background="?attr/colorprimary" android:theme="@style/themeoverlay.appcompat.actionbar" app:popuptheme="@style/themeoverlay.appcompat.light"/> <android.support.v4.widget.drawerlayout     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:layout_below="@id/my_toolbar">     <!-- main content view -->     <framelayout         android:id="@+id/content_frame"         android:layout_width="match_parent"         android:layout_height="match_parent" />     <!-- navigation drawer -->     <listview android:id="@+id/left_drawer"         android:layout_width="240dp"         android:layout_height="match_parent"         android:layout_gravity="start"         android:choicemode="singlechoice"         android:divider="@android:color/transparent"         android:dividerheight="0dp"         android:background="#111"/> </android.support.v4.widget.drawerlayout> 

thanks!

when using four-parameter constructor actionbardrawertoggle, need override activity's onoptionsitemselected() method, , call toggle's corresponding method trigger drawer opening , closing.

@override public boolean onoptionsitemselected(menuitem item) {     if(mdrawertoggle.onoptionsitemselected(item)) {         return true;     }     ...      return super.onoptionsitemselected(item); }