Custom Switch - track and selector size not working below 21 API

Question

Custom shape switch looks like that:

Above API 21

Below API 21

Seems like <size/> block doesn't work in <shape/> for pre 21 APIs.

Any ideas how to solve this?

---

CODE

container.xml:

<Switch
        android:id="@id/switch_follow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:textOff=""
        android:textOn=""
        android:thumb="@drawable/switch_selector"
        android:track="@drawable/switch_track"/>

drawable/switch_selector.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
    <layer-list>
        <item
            android:bottom="@dimen/switch_selector_padding"
            android:left="@dimen/switch_selector_padding"
            android:right="@dimen/switch_selector_padding"
            android:top="@dimen/switch_selector_padding">
            <shape
                android:dither="true"
                android:shape="oval"
                android:useLevel="false"
                android:visible="true">
                <gradient
                    android:angle="270"
                    android:endColor="@color/primary_white"
                    android:startColor="@color/primary_white"/>
                <corners
                    android:radius="@dimen/switch_radius"/>
                <size
                    android:width="@dimen/switch_track_height"
                    android:height="@dimen/switch_track_height" />
            </shape>
        </item>

    </layer-list>
</item>
</selector>

drawable/switch_track.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:dither="true"
android:shape="rectangle"
android:useLevel="false"
android:visible="true">
<gradient
    android:angle="270"
    android:endColor="@color/primary_yellow_dark_v2"
    android:startColor="@color/primary_yellow_dark_v2"/>
<corners android:radius="@dimen/switch_radius" />
<stroke
    android:width="@dimen/switch_stroke_height"
    android:color="@android:color/transparent">
</stroke>
<size
    android:width="@dimen/switch_track_width"
    android:height="@dimen/switch_track_height" />
</shape>

Perhaps someone faced a similar problem. Please share your experience.

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EDIT: added dimens used

<dimen name="switch_track_width">36dp</dimen>
<dimen name="switch_track_height">30dp</dimen>
<dimen name="switch_radius">50dp</dimen>
<dimen name="switch_selector_padding">2dp</dimen>
<dimen name="switch_stroke_height">0dp</dimen>

Answer 1

Everything is ok with the <size /> tag. The Drawable is created and applied correctly. Your issue lies completely within the Switch.

In older versions the before Lollipop the thumb was used with text and the drawable was nothing more than a background image which got scaled to the size necessary. You can verify this by adding text to the textOff and textOn attributes. Additionally there's a minimal width defined.

So just add a switchMinWidth of 0 and a thumbTextPadding of half the diameter of the thumb

<Switch
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:switchMinWidth="0dp"
    android:textOff=""
    android:textOn=""
    android:thumb="@drawable/switch_selector"
    android:thumbTextPadding="@dimen/switch_thumb_radius"
    android:track="@drawable/switch_track" />

and a correct radius definition for it

<dimen name="switch_track_height">30dp</dimen>
<dimen name="switch_thumb_radius">15dp</dimen>