导航抽屉仍然没有出现在工具栏上

我正在关注一本Android初学者书籍，尽管它很新，但在一些领域仍然过时。我正在制作我的第一个带有导航抽屉的应用程序，发现它用来实现导航抽屉的方法已经被取代了。

使用这个答案中的技术，我取得了一定的成功——以前导航抽屉中的顶部项目被工具栏完全遮挡，现在它只被部分遮挡——但我希望导航抽屉完全出现在工具栏上方。我曾尝试过移动一些XML，但没有成功。这是我的布局代码：

content_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                xmlns:app="http://schemas.android.com/apk/res-auto"
                tools:context=".MainActivity">
    <!-- Layout to hold fragments loaded by navdrawer-->
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:paddingBottom="@dimen/activity_vertical_margin"
        tools:context=".MainActivity"
        android:background="#ffffffff"
        android:id="@+id/fragmentHolder">
    </RelativeLayout>
    <android.support.v4.widget.DrawerLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/drawerLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true">
        <android.support.design.widget.NavigationView
            android:id="@+id/navigation"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            app:menu="@menu/nav" /> <!-- The items to display -->
    </android.support.v4.widget.DrawerLayout>

</RelativeLayout>

activity_main.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.interglobalmegacorp.whereitssnap.MainActivity">
    <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="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />
    </android.support.design.widget.AppBarLayout>
    <include layout="@layout/content_main" />
    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>

以下是发生的情况：截图链接，因为我没有足够的代表嵌入

我唯一的想法是，这可能与当前设置为NoActionBar的主题有关，因为其他任何事情似乎都会使应用程序崩溃：

This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.

我做错了什么？

EDIT onCreate（）方法：

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        mNavigationView = (NavigationView) findViewById(R.id.navigation);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout); // bind the layout
        mActivityTitle = getTitle().toString(); // get the title of the app and store it

        // set up the drawer with our purpose-built method
        setupDrawer();
        // set up the nav drawer toggle
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);
        // listen for clicks on navdrawer
        mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem item) {
                switchFragment(item);
                return true;
            }
        });
        // load default fragment
        Fragment fragment = new TitlesFragment();
        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.fragmentHolder, fragment, "TITLES").commit();
    }

根据指导原则，抽屉布局应包含协调员布局

关于代码中的第一个RealativeLayout，您应该删除它。

试试这个：

content_main.xml

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawerLayout" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true"> <include layout="@layout/activity_main"/> <android.support.design.widget.NavigationView android:id="@+id/navigation" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_gravity="start" app:menu="@menu/nav" />  </android.support.v4.widget.DrawerLayout>
activity_main.xml

<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.interglobalmegacorp.whereitssnap.MainActivity">  <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity" android:background="#ffffffff" android:id="@+id/fragmentHolder"> </RelativeLayout> <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="?attr/actionBarSize" android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" /> </android.support.design.widget.AppBarLayout> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin" android:src="@android:drawable/ic_dialog_email" /> </android.support.design.widget.CoordinatorLayout>
onCreate（）

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.content_main); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); mNavigationView = (NavigationView) findViewById(R.id.navigation); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout); // bind the layout mActivityTitle = getTitle().toString(); // get the title of the app and store it final ActionBar ab = getSupportActionBar(); if (ab != null) { ab.setDisplayHomeAsUpEnabled(true); ab.setHomeButtonEnabled(true); } mDrawerToggle = new ActionBarDrawerToggle( this, mDrawerLayout, mToolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); mDrawerLayout.addDrawerListener(mDrawerToggle); mDrawerToggle.syncState(); navigationView.setNavigationItemSelectedListener( new NavigationView.OnNavigationItemSelectedListener() { @Override public boolean onNavigationItemSelected(MenuItem menuItem) { switchFragment(item); return true; } }); // load default fragment Fragment fragment = new TitlesFragment(); FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction() .replace(R.id.fragmentHolder, fragment, "TITLES").commit(); }

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