导航汉堡在棒棒糖下方不可见

Question

我有一个导航抽屉activity。汉堡包和设置按钮在 Lollipop 中可见，但在 Lollipop 以下版本中不可见。但是，如果我触摸那个区域，它工作正常，只是不可见。

我的xml代码：

app_bar_nav

<?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=".activities.Home">

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

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

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

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


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

2.content_nav

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:background="@drawable/home_background"
tools:showIn="@layout/app_bar_home_nav"
android:weightSum="3">

   <RelativeLayout
   android:layout_width="match_parent"
   android:layout_height="0dp"
   android:layout_weight="1">

  </RelativeLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:orientation="horizontal"
    android:weightSum="3">

    <ImageView
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_margin="15dp"
        android:src="@drawable/home_reminders"
        android:layout_height="wrap_content"
        android:id="@+id/imageView_home_reminders" />

    <ImageView
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_margin="15dp"
        android:src="@drawable/home_orders"
        android:layout_height="wrap_content"
        android:id="@+id/imageView_home_orders" />

    <ImageView
        android:layout_width="0dp"
        android:layout_weight="1"
        android:src="@drawable/home_vitals"
        android:layout_margin="15dp"
        android:layout_height="wrap_content"
        android:id="@+id/imageView_home_vitals" />
</LinearLayout>

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1">

</RelativeLayout>
</LinearLayout>

3.activity_nav

   <?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"
    tools:openDrawer="start">

    <include
        layout="@layout/app_bar_home_nav"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <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:itemTextColor="#000000"
        app:menu="@menu/activity_home_nav_drawer" />

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

棒棒糖截图：

Lollipop screen shot

非（下）棒棒糖截图

Below Lollipop screenshot

Answer 1

        final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawerLayout, toolbar, R.string.abc_action_bar_home_description, R.string.abc_action_bar_home_description) {
            @Override
            public void onDrawerSlide(View drawerView, float slideOffset) {
                super.onDrawerSlide(drawerView, slideOffset);
            }
        };
        drawerLayout.setDrawerListener(toggle);
        toggle.syncState();

导航汉堡在棒棒糖下方不可见

Navigation hamburger not visible below Lollipop

android

android-layout

navigation-drawer

android-navigationview