Hello, it's not a bug. Please make sure you follow the step 2 from our doc.
https://developers.amplitude.com/docs/unity

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thanks for answer. i'd build success but have a error when i'm trying log an event. this is error in picture

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if you have video setup, please send me

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@phamhuong8794 Can you try add

-keep class com.amplitude.unity.plugins.AmplitudePlugin { *; }

to your Proguard exceptions file?

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An error if i change this proguard: -keep class com.amplitude.unity.plugins.AmplitudePlugin { *; }

2020-06-25 09:41:37.651 27740-27740/? E/Zygote: isWhitelistProcess - Process is Whitelisted
2020-06-25 09:41:37.652 27740-27740/? E/libpersona: scanKnoxPersonas
2020-06-25 09:41:37.652 27740-27740/? E/libpersona: Couldn't open the File - /data/system/users/0/personalist.xml - No such file or directory
2020-06-25 09:41:38.246 27740-27740/com.android.application E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.android.application, PID: 27740
java.lang.NoClassDefFoundError: Failed resolution of: Lcom/unity3d/player/UnityPlayer;
at com.unity3d.player.UnityPlayerActivity.onCreate(Unknown Source:7)
at android.app.Activity.performCreate(Activity.java:7183)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.unity3d.player.UnityPlayer" on path: DexPathList[[zip file "/data/app/com.android.application-QqsCvCzcpl4HUeWyktLyiw==/base.apk"],nativeLibraryDirectories=[/data/app/com.android.application-QqsCvCzcpl4HUeWyktLyiw==/lib/arm, /data/app/com.android.application-QqsCvCzcpl4HUeWyktLyiw==/base.apk!/lib/armeabi-v7a, /system/lib, /system/vendor/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:93)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at com.unity3d.player.UnityPlayerActivity.onCreate(Unknown Source:7) 
at android.app.Activity.performCreate(Activity.java:7183) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032) 
at android.app.ActivityThread.-wrap11(Unknown Source:0) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696) 
at android.os.Handler.dispatchMessage(Handler.java:105) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6944) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374) 

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This error seems strange. I'm not sure why your proguard is behaving this way.

The idea is not to obfuscate com.amplitude.unity.plugins.AmplitudePlugin class and its methods.

Which is this -

-keep class com.amplitude.unity.plugins.AmplitudePlugin

I don't think that's the issue in our tutorial. Maybe you can create a clean project to test it out.

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i'm create 4 times new project, and result is same. have issue of unity version??? i'm working in unity 2017.4.31f1. I'm don't find every package name is com.amplitude.unity.plugins.AmplitudePlugin in package

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2017? That's too old. We're on 2019.3.11f.

Also that class is inside our android sdk.

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Do I need to import that sdk into the project?

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i trying up to unity 2018.4.23f1, it same (@@)

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If possible, please give me a video of how to add the library

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Thanks haoliu,
I have finished adding amplitude to my project. There are some issues that hopefully help someone in need:

1. i'm update version unity to 2018
2. user lastest resolve jar
3. replace -keep class com.amplitude.unity.plugins.AmplitudePlugin { *; } instead -keep class com.amplitude.unity.plugins.AmplitudePlugin
4. This is how to add proguard file into unity: https://stackoverflow.com/questions/43774062/crashlytics-unity-plugin-export-to-android-studio/46840109#46840109
   Goodluck!!

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@phamhuong8794 Glad you figured it out! Thanks for sharing the steps too!

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