E/AndroidRuntime: FATAL EXCEPTION: main
Process: de.creatronix.levelup, PID: 17026
java.lang.RuntimeException: Unable to start activity ComponentInfo{de.creatronix.levelup/de.creatronix.levelup.MainActivity}: android.view.InflateException: Binary XML file line #18: Error inflating class fragment

after enabling minification in my build.

The issue is that with the usage of safeargs with custom objects we use the the @parcelize annotation which seems to be optimized away with R8

Fix

Add

-keepnames class * extends android.os.Parcelable

to your proguard-rules.pro file

The post How to fix android.view.InflateException: Error inflating class fragment appeared first on Creatronix.

This included all basic / built-in types like Strings and Integers.

In this part I will show you how you can pass custom objects.

Peprare your class

To use a custom class for passing between fragments it has to be of type Parcelable and you must use the annotation @Parcelize

import android.os.Parcelable
import kotlinx.parcelize.Parcelize

@Parcelize
class VideoPlayListItem(val videoID: String, val videoTitle: String): Parcelable {

}

Gradle Plugin

Add kotlin-parcelize to your module gradle.build

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'androidx.navigation.safeargs.kotlin'
    id "kotlin-parcelize"

Add argument in nav_graph.xml

<fragment
    android:id="@+id/VideoPlayerFragment"
    android:name="de.creatronix.levelup.fragments.VideoPlayerFragment"
    android:label="@string/video_player_fragment_label"
    tools:layout="@layout/fragment_video_player">

    <argument
        android:name="video"
        app:argType="de.creatronix.levelup.VideoPlayListItem" />
</fragment>

Pass data to fragment action

val action =
    VideoFragmentDirections.actionVideoFragmentToVideoPlayerFragment(
        clickedItem
    )
findNavController().navigate(action)

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