Icon doesn't show on app android studio

Question

I have a problem with my app.
I know there are similar questions, but they didn't help me.
My app icon is not visible.
I added a new icon via mipmap -> NEW -> Image Asset.
But it doesn't show.

Here is my Manifest file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.owner.takeandgo">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/my_car"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/round_car"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".controller.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".controller.AddCarActivity"
            android:label="Add_Car" />
        <activity
            android:name=".controller.AddClientActivity"
            android:label="Add Client" />
        <activity
            android:name=".controller.AddCarModelActivity"
            android:label="Add Car Model" />
        <activity
            android:name=".controller.ShowCarListActivity"
            android:label="Show Car List" />
        <activity
            android:name=".controller.ShowCarModelListActivity"
            android:label="Show Car Model List" />
        <activity
            android:name=".controller.ShowBranchListActivity"
            android:label="Show Branch List" />
        <activity
            android:name=".controller.ShowClientListActivity"
            android:label="Show Client List" />
        <activity
            android:name=".controller.AddBranchActivity"
            android:label="Add Branch"></activity>
    </application>

</manifest>

And this is the style I use:

<resources>

    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>

</resources>

This is my XML layout:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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"
    tools:context="com.example.owner.takeandgo.controller.MainActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <Button
            android:id="@+id/AddCarButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Add Car" />

        <Button
            android:id="@+id/AddBranchButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Add Branch" />

        <Button
            android:id="@+id/AddCarModelButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Add Car Model" />

        <Button
            android:id="@+id/AddClientButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Add Client" />

        <Button
            android:id="@+id/showCarListButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dp"
            android:text="Show Car List" />

        <Button
            android:id="@+id/showBranchListButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Show Branch List" />

        <Button
            android:id="@+id/showCarModelListButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Show Car Model List" />

        <Button
            android:id="@+id/showClientListButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Show Client List" />


   </LinearLayout>
</ScrollView>

And this is a picture of the Android Emulator, Only the text appears but not the icon:

Answer 1

It works now. I added these lines to th main activity:

getSupportActionBar().setLogo(R.mipmap.my_car);
getSupportActionBar().setDisplayUseLogoEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);