Android Toolbar: small title text in landscape mode

I tried to set android:titleTextAppearance of the toolbar but the style wasn't being applied. Then I realized I'm using the AppCompat theme so I used app:titleTextAppearance and the style is now being applied. It looks like the small letters in landscape are a problem in the built-in AppCompat.Toolbar.Title style itself so I overrode it to set the font size manually. The final code:

Toolbar XML:

<android.support.v7.widget.Toolbar
        android:id="@+id/main_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:titleTextAppearance="@style/ToolbarTitle"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

Toolbar Style:

<style name="ToolbarTitle" parent="@style/TextAppearance.Widget.AppCompat.Toolbar.Title">
        <item name="android:textSize">20sp</item>
</style>

AOSP Issue #170707 was written regarding the change in text size for title and subtitle. Project Member response was "Works as intended. Identical to framework behavior." Although I don't find changing the text size to be the desirable default behavior, it sounds like the AppCompat engineers had to maintain consistency with the (flawed) framework behavior. Developers are then left to override the default styles as described in Chilly Chan's answer.

Additions to Chilly Chan's answer:

1) The subtitle text size can be controlled in a similar way by defining another style derived from TextAppearance.Widget.AppCompat.Toolbar.Subtitle.

2) Default values for title/subtitle size in portrait orientation are 20dp/16dp (on my Galaxy S3, 4.4.2.). Chilly Chan's example specifies "17sp". Use "sp" only if you want to let user preference setting affect title/subtitle size.

I was looking for a solution without custom Toolbar, but with custom style and this code did the trick for me:

styles.xml

<style name="MyTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="actionBarStyle">@style/MyActionBar</item>
</style>

<style name="MyActionBar" parent="@style/Widget.AppCompat.Light.ActionBar.Solid">
    <item name="titleTextStyle">@style/MyTitleTextStyle</item>
</style>

<style name="MyTitleTextStyle" parent="@style/TextAppearance.AppCompat.Title">
    <item name="android:textSize">20sp</item> <!-- Default for portrait is 20sp and for landscape 14sp-->
</style>

AndroidManifest.xml

    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/MyTheme"/>

Where the MainActivity extends AppCompatActivity; tested on API 19, 22 and 23.

Android Toolbar: small title text in landscape mode

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