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i have a problem on one of my activities the drawer is not showing when i'm clicking on the icon but when i swipe it's shown normally
i tried to toast a message when the icon is clicked but got nothing
the problem is other activities are working just fine with the same code i have a problem only with this one

 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 drawer = findViewById(R.id.drawer_layout);


 toolbar = findViewById(R.id.toolbar);
 setSupportActionBar(toolbar);

 ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
 this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
 toggle.setToolbarNavigationClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View view) 
 drawer.openDrawer(GravityCompat.START);
 
 );
 toggle.setHomeAsUpIndicator(R.mipmap.nav);
 drawer.addDrawerListener(toggle);
 toggle.syncState();

 toggle.setDrawerIndicatorEnabled(false);


 navigationView = findViewById(R.id.nav_view);
 navigationView.setNavigationItemSelectedListener(this);

and this is the layout file

 <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"
 tools:openDrawer="start">



<LinearLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">

 <include
 layout="@layout/app_bar_main"
 android:layout_width="match_parent"
 android:layout_height="80dp" />

and this is the app_bar_main layout

<android.support.design.widget.CoordinatorLayout 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"
 tools:context="com.vpapps.hdwallpaper.MainActivity">

 <android.support.design.widget.AppBarLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:elevation="0dp"
 android:theme="@style/AppTheme.AppBarOverlay"
 tools:targetApi="lollipop">

 <com.vpapps.utils.StatusBarView
 android:id="@+id/statusBar"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="@color/colorPrimary"/>

 <android.support.v7.widget.Toolbar
 android:id="@+id/toolbar"
 android:layout_width="match_parent"
 android:layout_height="?attr/actionBarSize"
 android:background="@color/colorPrimaryDark"
 app:popupTheme="@style/AppTheme.PopupOverlay"
 android:elevation="0dp"
 tools:targetApi="lollipop" />

 </android.support.design.widget.AppBarLayout>

 <include layout="@layout/content_main_walpaper" />

</android.support.design.widget.CoordinatorLayout>

i tried many things but still same problem
thanks