导航抽屉不够宽

Question

How can I make my navigation drawer as wide as what is suggested (like in the Gmail app)?

In my app it only extends to just over half of the screen.

activity_main.xml

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        tools:context="com.example.apple.bookshelf.MainActivity">

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

            <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/ThemeOverlay.AppCompat.Light"  />

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

        <ListView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/authors_list_view"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

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

    <android.support.design.widget.NavigationView
        android:id="@+id/navigation_view"
        android:layout_height="match_parent"
        android:layout_width="wrap_content"
        android:layout_gravity="start"
        app:headerLayout="@layout/nav_header"
        app:menu="@menu/menu_navigation"/>

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

Answer 1

Possibly you could try to customize the Navigation drawer. The official documentation says

If none of the prebuilt widgets or layouts meets your needs, you can create your own View subclass.

you could think to create your own Navigation Drawer, here are offered several solutions, also the possibility to use libraries, you can see the source code, but also trying in the classical way, extending the class you need and override the methods you want to change