Navigation drawer menu icon is not displayed correctly
<p>I want to input my customized icon into the menu in navigation drawer. However, when I run the application it only display a shadow of icon. How do I show the image correctly?</p>

<p><a href="https://i.stack.imgur.com/krbXs.png" rel="noreferrer"><img src="https://i.stack.imgur.com/krbXs.png" alt="enter image description here"></a></p>

<p>Here is the xml file for menu activity_main_drawer.xml:</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;menu xmlns:android="http://schemas.android.com/apk/res/android"&gt;
    &lt;group android:checkableBehavior="single"&gt;
        &lt;item
            android:id="@+id/recent_picture"
            android:icon="@mipmap/ic_recent"
            android:title="Import" /&gt;
        &lt;item
            android:id="@+id/nav_gallery"
            android:icon="@drawable/ic_menu_gallery"
            android:title="Gallery" /&gt;
        &lt;item
            android:id="@+id/nav_slideshow"
            android:icon="@drawable/ic_menu_slideshow"
            android:title="Slideshow" /&gt;
        &lt;item
            android:id="@+id/nav_manage"
            android:icon="@drawable/ic_menu_manage"
            android:title="Tools" /&gt;
    &lt;/group&gt;
&lt;/menu&gt;
</code></pre>

<p>Here is the xml layout with the navigation view:</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;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:openDrawer="start"&gt;

    &lt;include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" /&gt;

    &lt;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_main"
        app:menu="@menu/activity_main_drawer" /&gt;
&lt;/android.support.v4.widget.DrawerLayout&gt;
</code></pre>

<p>There is another drawables.xml files found in the values folder. </p>

<pre><code>&lt;resources xmlns:android="http://schemas.android.com/apk/res/android"&gt;
&lt;item name="ic_recent_picture" type="drawable"&gt;@mipmap/ic_recent&lt;/item&gt;
&lt;item name="ic_menu_gallery" type="drawable"&gt;@drawable/ic_menu_gallery&lt;/item&gt;
&lt;item name="ic_menu_slideshow" type="drawable"&gt;@android:drawable/ic_menu_slideshow&lt;/item&gt;
&lt;item name="ic_menu_manage" type="drawable"&gt;@android:drawable/ic_menu_manage&lt;/item&gt;
&lt;item name="ic_menu_share" type="drawable"&gt;@android:drawable/ic_menu_share&lt;/item&gt;
&lt;item name="ic_menu_send" type="drawable"&gt;@android:drawable/ic_menu_send&lt;/item&gt;
</code></pre>

<p></p>