Odtnhj

I try to get a navigation drawer that can be used for every activity (in kotlin). Unfortunately the content of the activities isn't shown if I extend the NavigationDrawerActivity. I know there are a lot of questions about this topic but the already given answers couldn't fix my problem.

I toke the most from the Android Studio Navigation layout so my NavigationDrawerActivity looks like this:

abstract class NavigationDrawerActivity : AppCompatActivity(), 
NavigationView.OnNavigationItemSelectedListener 

override fun onCreate(savedInstanceState: Bundle?) 
 super.onCreate(savedInstanceState)
 setContentView(R.layout.nav_layout)
 setSupportActionBar(toolbar)

 val toggle = ActionBarDrawerToggle(
 this, drawer_layout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close
 )
 drawer_layout.addDrawerListener(toggle)
 toggle.syncState()

 nav_view.setNavigationItemSelectedListener(this)


override fun onBackPressed() 
 if (drawer_layout.isDrawerOpen(GravityCompat.START)) 
 drawer_layout.closeDrawer(GravityCompat.START)
 else 
 super.onBackPressed()
 


override fun onNavigationItemSelected(item: MenuItem): Boolean 
 // Handle navigation view item clicks here.
 when (item.itemId) 
 //Handle selected item
 

 drawer_layout.closeDrawer(GravityCompat.START)
 return true

The belonging layoutfile:

<?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"
 android:layout_gravity="start"
 tools:openDrawer="start">

 <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="wrap_content"
 android:layout_height="match_parent"
 tools:context=".NavigationDrawerActivity">

 <android.support.design.widget.AppBarLayout
 android:layout_height="wrap_content"
 android:layout_width="match_parent"
 android:theme="@style/AppTheme.AppBarOverlay">

 <android.support.v7.widget.Toolbar
 android:id="@+id/toolbar"
 android:layout_width="match_parent"
 android:layout_height="?attr/actionBarSize"
 android:background="?attr/colorPrimary"
 app:popupTheme="@style/AppTheme.PopupOverlay"/>

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

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

 <android.support.design.widget.NavigationView

 android:id="@+id/nav_view"
 android:layout_width="wrap_content"
 android:layout_height="match_parent"
 android:layout_gravity="start"
 android:fitsSystemWindows="true"
 app:headerLayout="@layout/nav_header"/>

 </android.support.v4.widget.DrawerLayout>

Now when I create an activity extending the navigation the content of the layout of the activity (activity_main) isn't shown.

class MainActivity : NavigationDrawerActivity() 

 override fun onCreate(savedInstanceState: Bundle?) 
 setContentView(R.layout.activity_main)
 super.onCreate(savedInstanceState)

 

Maybe it's because of the order of the two statements in the MainActivity:

 setContentView(R.layout.activity_main)
 super.onCreate(savedInstanceState)

But if I change the order I can see my content, but not the Navigation.

Does anybody know my error?