Add support for predictive back gesture

[connyduck]

About this issue

MaterialDrawer should have the same or a similar predictive back animation as com.google.android.material.navigation.NavigationView has. I attached a video so you can see what I mean:

Screen_recording_20250106_083236.mp4

More information on predictive back: https://developer.android.com/guide/navigation/custom-back/predictive-back-gesture

Since Android 15, predictive back is no longer optional, and users expect the app to do something when they start the back gesture, but unfortunately the MaterialDrawer just stays in place.

Checklist

• Searched for similar issues
• Checked out the sample application
• Read the README
• Checked out the CHANGELOG
• Read the FAQ
• Checked out the MIGRATION GUIDE

[mikepenz]

This library does not control or overtake the back behavior of the host app. Its only purpose is to provide the slider contents for the androidx.drawerlayout.widget.DrawerLayout.

If there was any back navigation related behavior, the DrawerLayout would be potentially the component to handle it.

The sample could be updated to no longer use onBackPressed (which is going to be no longer supported) - however that's only the sample and not part of the library. (Would appreciate if someone had the time to do that though)

[connyduck]

This library does not control or overtake the back behavior of the host app.

I know, and I think this made sense until predictive back was a thing. But now there should be some kind of predictive back animation, and implementing that from the host app seems impossible.

Ideally, the MaterialDrawerSliderView would automatically animate or get methods so the host app can tell it when to animate.

Or, it can be set as a child of NavigationView so NavigationView can handle the animation.

<androidx.drawerlayout.widget.DrawerLayout xmlns : android ="http://schemas.android.com/apk/res/android"
xmlns:app = "http://schemas.android.com/apk/res-auto"
android:id = "@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    ... your content ...
<com.google.android.material.navigation.NavigationView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:padding="0dp"
        android:layout_gravity="start">

        <com.mikepenz.materialdrawer.widget.MaterialDrawerSliderView
            android:id="@+id/slider"
            android:layout_width="wrap_content"
            android:layout_height="match_parent" />

</com.google.android.material.navigation.NavigationView>

</androidx.drawerlayout.widget.DrawerLayout>

(Currently this works but doesn't look nice)