Android Symbolleiste Symbol fehlt aber kann immer noch ausgewählt werden

Question

aus irgendeinem Grund kann ich nicht herausfinden, warum mein Hamburger-Symbol kann nicht gesehen werden, kann aber immer noch ausgewählt werden und alles ist so verteilt, als ob es immer noch da ist. Dies geschieht auch mit dem 3 horizontalen Punktsymbol auf der gegenüberliegenden Seite, das ich eingerichtet hatte, um zum Abmeldebereich zu gelangen.

MainActivity.java

public class MainActivity extends AppCompatActivity implements 
NavigationView.OnNavigationItemSelectedListener { 

private Toolbar mToolbar; 
private DrawerLayout mDrawerLayout; 




@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Toolbar myToolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(myToolbar); 

    // Find our drawer view 
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 

    setupToolbarMenu(); 
    setupNavigationDrawerMenu(); 

} 
private void setupToolbarMenu() { 

    mToolbar = (Toolbar) findViewById(R.id.toolbar); 
    mToolbar.setTitle("Recovery Toolkit"); 
} 
private void setupNavigationDrawerMenu() { 

    NavigationView navigationView = (NavigationView) 
    findViewById(R.id.nav_view); 
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
    navigationView.setNavigationItemSelectedListener(this); 

    ActionBarDrawerToggle drawerToggle = new 
    ActionBarDrawerToggle(this, 
      mDrawerLayout, 
      mToolbar, 
      R.string.drawer_open, 
      R.string.drawer_close); 

    mDrawerLayout.addDrawerListener(drawerToggle); 
    drawerToggle.syncState(); 
} 

activity_main.xml

<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:context=".activity.SplashActivity" 
tools:openDrawer="start"> 

<LinearLayout 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"> 

<android.support.design.widget.CoordinatorLayout 
    android:id="@+id/main_content" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 

<android.support.design.widget.AppBarLayout 
    android:id="@+id/appbar" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:theme="@style/MyMaterialTheme"> 

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

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

    <android.support.v4.view.ViewPager 
     android:id="@+id/viewpager" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 

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

</LinearLayout> 


<!-- Navigation View --> 
<android.support.design.widget.NavigationView 
    android:id="@+id/nav_view" 
    android:layout_width="@dimen/nav_drawer_width" 
    android:layout_height="match_parent" 
    android:layout_gravity="start" 
    app:headerLayout="@layout/nav_header_main" 
    android:fitsSystemWindows="true" 
    app:menu="@menu/activity_main_drawer" 
    android:theme="@style/MyMaterialTheme"/> 

toolbar.xml

nav_header_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="@dimen/nav_drawer_width" 
android:layout_height="190dp" 
android:elevation="16dp" 
xmlns:tools="http://schemas.android.com/tools" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:background="@drawable/background_header"> 



<LinearLayout 
    android:layout_width="@dimen/nav_drawer_width" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    android:paddingBottom="15dp" 
    android:paddingStart="15dp" 
    android:paddingEnd="15dp" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentStart="true" 
    android:layout_marginTop="56dp"> 


    <ImageView 
     android:id="@+id/user_profile" 
     android:layout_width="@dimen/nav_drawer_profile_image_size" 
     android:layout_height="50dp" 
     android:gravity="bottom" 
     app:srcCompat="@drawable/ic_account_circle_white_64dp" 
     tools:ignore="ContentDescription" /> 

    <ImageView 
     android:layout_width="@dimen/nav_drawer_width" 
     android:layout_height="wrap_content" 
     android:contentDescription="@string/item_desc" /> 


    <TextView 
     android:id="@+id/txvName" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="center" 
     android:layout_weight="3" 
     android:fontFamily="roboto-bold" 
     android:gravity="bottom" 
     android:text="@string/user_name" 
     android:textColor="@color/colorPrimaryText" 
     android:textSize="14sp" /> 

    <TextView 
     android:id="@+id/txvEmail" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="center" 
     android:layout_weight="1" 
     android:fontFamily="roboto" 
     android:gravity="bottom" 
     android:text="@string/email" 
     android:textColor="@color/colorPrimaryText" 
     android:textSize="14sp" /> 

</LinearLayout> 

Answer 1

ich Ihre Hilfe jeder zu schätzen wissen, aber scheint, dass ich nur fehlte:

local:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" 
local:popupTheme="@style/ThemeOverlay.AppCompat.Light" 

Sobald ich, dass alles normal gestartet Arbeit aufgenommen. Danke noch einmal!

Answer 2

drawerToggle.setDrawerIndicatorEnabled(true); 

diese Zeile hinzufügen. Beispiel:

. 
. 
mDrawerLayout.addDrawerListener(drawerToggle); 
drawerToggle.setDrawerIndicatorEnabled(true); 
drawerToggle.syncState(); 

(Es tut mir leid .Ich genug Kredite nicht zu kommentieren) EDIT

: Sie versuchen, dieses Layout und sehen es

activity_main.xml

arbeitet

<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:context=".activity.SplashActivity" 
tools:openDrawer="start"> 

<LinearLayout 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"> 

<android.support.design.widget.CoordinatorLayout 
    android:id="@+id/main_content" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 

<android.support.design.widget.AppBarLayout 
    android:id="@+id/appbar" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:theme="@style/MyMaterialTheme"> 



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

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

    <android.support.v4.view.ViewPager 
     android:id="@+id/viewpager" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 

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

</LinearLayout> 


<!-- Navigation View --> 
<android.support.design.widget.NavigationView 
    android:id="@+id/nav_view" 
    android:layout_width="@dimen/nav_drawer_width" 
    android:layout_height="match_parent" 
    android:layout_gravity="start" 
    app:headerLayout="@layout/nav_header_main" 
    android:fitsSystemWindows="true" 
    app:menu="@menu/activity_main_drawer" 
    android:theme="@style/MyMaterialTheme"/> 

toolbar.xml

<?xml version="1.0" encoding="utf-8"?> 
<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" 
android:fitsSystemWindows="true"tools:context="com.granitemountainbhc.recoverytoolkit.activity.MainActivity"> 

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

    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:background="?attr/colorPrimary" 
     app:popupTheme="@style/MyMaterialTheme" 
     app:layout_scrollFlags="scroll|enterAlways" /> 



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

<FrameLayout 
    android:id="@+id/frame" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior"> 
</FrameLayout> 

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