Missing slide_in_right and slide_out_left animations in Android?

Question

I'm trying to use the Jetpack Navigation component. The docs here talk about animating transitions. The example code uses the animations slide_in_right and slide_out_left and acts like they will be there by default - there is no instruction on how to create them.

<action
    ...
    app:enterAnim="@anim/slide_in_right"
    app:exitAnim="@anim/slide_out_left"
    app:popEnterAnim="@anim/slide_in_left"
    app:popExitAnim="@anim/slide_out_right" />

But when I click on the attributes as shown below, in the design view of the navigation graph resource, I only see slide_in_left and side_out_right. Why are the other two not there?

My goal is to make a push/pop like animation where the new view comes in from the right and the old view moves out to the left. (Reverse for "popping" back in the nav stack.)

I do see some other questions about these animations, but they answers are old and it sounds like there may have been a bug, so I'm wondering what the answer is now in 2020.

Answer 1

slide_in_rigth and slide_out_left animation can be found in SDK but when I tried to use from XML I got this error:

AAPT: error: resource android:anim/slide_in_right is private.

So I copied content of animations to my resource files as below:

Here are contents of animations which I copied from Android SDK. For slide_in_right.xml:

 <?xml version="1.0" encoding="utf-8"?>
    <set xmlns:android="http://schemas.android.com/apk/res/android">
        <translate android:fromXDelta="50%p" android:toXDelta="0"
            android:duration="@android:integer/config_mediumAnimTime"/>
        <alpha android:fromAlpha="0.0" android:toAlpha="1.0"
            android:duration="@android:integer/config_mediumAnimTime" />
    </set>

For slide_out_left.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="0" android:toXDelta="-50%p"
        android:duration="@android:integer/config_mediumAnimTime"/>
    <alpha android:fromAlpha="1.0" android:toAlpha="0.0"
        android:duration="@android:integer/config_mediumAnimTime" />
</set>

Now they can be use with @animator so I added to my navigation.xml as below:

    <action
        ...
        app:enterAnim="@animator/slide_in_right"
        app:exitAnim="@animator/slide_out_left" />

It works for me, I hope it will help you.