Develop Reference

Dynamic feature: Unable to instantiate fragment : make sure class name exists

I'm trying to load my fragment that lives in a dynamic feature module. However, I keep getting a crash:
val f = FragmentFactory().instantiate(classLoader,
"com.myapp.customviewdynamicfeature.CustomFragment")
supportFragmentManager.beginTransaction()
.add(R.id.customFragmentContainer, f).commit()
2022-03-25 11:36:54.020 20732-20732/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.myapp.dynamicdeliverysampleapp, PID: 20732
androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.myapp.customviewdynamicfeature.CustomFragment: make sure class name exists
at androidx.fragment.app.FragmentFactory.loadFragmentClass(FragmentFactory.java:97)
at
I also tried adding this to my dynamic module's proguard
-keep class com.myapp.customviewdynamicfeature.** { *; }
I've also tried reflection:
val f = Class.forName("com.myapp.customviewdynamicfeature.CustomFragment").newInstance() as Fragment
but I get a similar error:
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:558)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003) 
Caused by: java.lang.ClassNotFoundException: com.myapp.customviewdynamicfeature.CustomFragment

I believe I resolved this by upgrading the AndroidX fragment version to 1.5.0.
https://developer.android.com/jetpack/androidx/releases/fragment#version_15_2

Error inflating class androidx.appcompat.widget.AppCompatSpinner

We are seeing a crash Error inflating class androidx.appcompat.widget.AppCompatSpinner on the play console,but we are not able to reproduce it.
Here is my xml :
<androidx.appcompat.widget.AppCompatSpinner
android:id="#+id/spinnerState"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/xMargin_42_156"
android:layout_marginEnd="#dimen/xMargin_42_156"
android:background="#drawable/spinner_down_arrow"
android:focusableInTouchMode="true"
android:overlapAnchor="false"/>
In build.gradle
implementation 'androidx.appcompat:appcompat:1.2.0'
Logs:
Fatal Exception: java.lang.RuntimeException
Unable to start activity ComponentInfo{com.wrap/com.wrap.activities.NewIntroActivity}: android.view.InflateException: Binary XML file line #129 in com.wrap:layout/activity_new_intro: Binary XML file line #129 in com.wrap:layout/activity_new_intro: Error inflating class androidx.appcompat.widget.AppCompatSpinner

FragmentContainerView with SupportMapFragment crashes when minify is enabled

I have the following layout:
<androidx.fragment.app.FragmentContainerView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/map"
tools:context=".map.MapActivity"
android:name="com.google.android.gms.maps.SupportMapFragment" />
It works fine with my debug build, but my release build with minify enabled crashes.
09-04 15:14:06.727 15555 15555 E AndroidRuntime: android.view.InflateException: Binary XML file line #8: Binary XML file line #8: Error inflating class androidx.fragment.app.FragmentContainerView
09-04 15:14:06.727 15555 15555 E AndroidRuntime: Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class androidx.fragment.app.FragmentContainerView
09-04 15:14:06.727 15555 15555 E AndroidRuntime: Caused by: androidx.fragment.app.Fragment$c: Unable to instantiate fragment com.google.android.gms.maps.SupportMapFragment: make sure class name exists
Any suggestions on how to fix it? If I replace the FragmentContainerView with the old fragment view, it works.

The problem might be related to minification. If you have minify enabled, you probably have to add something similar to this to your proguard:
-keep class com.google.android.gms.maps.** { *; }

This is caused by a bug in aapt2, and is being tracked in a bug by google here: https://issuetracker.google.com/issues/142601969
In the meantime, the easiest way to fix this is to add #Keep to any fragments that you use in this manner.
If it's a fragment from a library where you are unable to modify the code, you can add it as a rule in your proguard.cfg:
-keep class om.google.android.gms.maps.** { *; }

com.android.support:design with androidX (1.0.2)

I want to use TextInputLayout inside my project, but I'm using androidX library
implementation "androidx.appcompat:appcompat:1.0.2"
/*this don't work*/
implementation "com.android.support:design:28.0.0"
This is the exception which I'm facing
android.view.InflateException: Binary XML file line #30: Binary XML file line #30: Error inflating class android.support.design.widget.TextInputLayout
Caused by: android.view.InflateException: Binary XML file line #30: Error inflating class android.support.design.widget.TextInputLayout
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.design.widget.TextInputLayout" on path: DexPathList[[zip file "/data/app/com.example

Error inflating class android.support.design.widget.TextInputLayout
Caused by: java.lang.ClassNotFoundException: Didn't find class
This error thrown when the Java Virtual Machine (JVM) tries to load a particular class and the specified class cannot be found in the classpath.
You should use
com.google.android.material.textfield.TextInputLayout
DEMO
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<com.google.android.material.textfield.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</com.google.android.material.textfield.TextInputLayout>
Then Clean-Rebuild-Run.

Error Unable to instantiate service com.google.firebase.iid.FirebaseInstanceIdService: java.lang.ClassNotFoundException- in Proguard Enabled release

I am getting below mentioned error,
I cleaned the project, also Invalidate and restart done. but still same problem.
Proguard is enabled.-android studio:3.3.1
java.lang.RuntimeException: Unable to instantiate service com.google.firebase.iid.FirebaseInstanceIdService: java.lang.ClassNotFoundException: Didn't find class
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.iid.FirebaseInstanceIdService" on path: DexPathList

Simple add -keep class com.google.firebase.iid.FirebaseInstanceIdService in your ProGuard configuration file.