Compiled an APK and tested it successfully on my device, tried it through the Google Play Store and it stops working immediately. This app is a copy of an existing app, since you cannot have the same package name twice I simply renamed the package name in the AndroidManifest.xml, compiled it, tested it and then uploaded it to the Play Store.
I do not understand why the app works when I copy it to a device but the same app fails when loaded through the Play Store. I generated a crash report which I accessed from the Play Store Developer Console. If anyone has experience of successfully duplicating apps on the Store then your help would be appreciated.
java.lang.RuntimeException: Unable to instantiate application de.schildbach.wallet.artbyte.WalletApplication: java.lang.ClassNotFoundException: Didn't find class "de.schildbach.wallet.artbyte.WalletApplication" on path: DexPathList[[zip file "/data/app/de.schildbach.wallet.artbyte-1/base.apk"],nativeLibraryDirectories=[/data/app/de.schildbach.wallet.artbyte-1/lib/arm, /data/app/de.schildbach.wallet.artbyte-1/base.apk!/lib/armeabi, /vendor/lib, /system/lib]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:680)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6395)
at android.app.ActivityThread.access$1800(ActivityThread.java:229)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1887)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7325)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.ClassNotFoundException: Didn't find class "de.schildbach.wallet.artbyte.WalletApplication" on path: DexPathList[[zip file "/data/app/de.schildbach.wallet.artbyte-1/base.apk"],nativeLibraryDirectories=[/data/app/de.schildbach.wallet.artbyte-1/lib/arm, /data/app/de.schildbach.wallet.artbyte-1/base.apk!/lib/armeabi, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newApplication(Instrumentation.java:1005)
at android.app.LoadedApk.makeApplication(LoadedApk.java:670)
... 9 more
Suppressed: java.lang.ClassNotFoundException: de.schildbach.wallet.artbyte.WalletApplication
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 12 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
The Exception says that build is failed due to class not found on dex path list. Build the apk by cleaning the project and also recompile the native code using the ndk-build command. Then try it on the local device and then upload to play store.
The package name in AndroidManifest.xml is often also used for the code base, e.g. as class name of the activities. If you only rename the package name but leave the Java/dex code unchanged Android will not be able to find some classes as you already have noticed.
Check the AndroidManifest.xml for package relative class names (those that start with a .) and prepend the old package name:
Example
Old package name: org.example.myapp
Old activity name: <activity android:name=".MyActivity" ..>
New package name: com.example.newappname
New activity name: <activity android:name="org.example.myapp.MyActivity" ..>
Related
I am trying to make an HTTP call to a server to get its HTML contents everything is working fine on other android versions. But in android 6 when the app is calling HTMLunit it crashes.
I know it has to do with something that works on API above 23. but not on the 23.. I tried many things but I sill can't fix it...
Why it's important to run the app on android 6:
A big number of my users is using android 6 and 5
The error:
FATAL EXCEPTION: Thread-9255
Process: bd.maruf.myapplication, PID: 7773
java.lang.NoClassDefFoundError: java.util.function.Supplier
at libcore.reflect.InternalNames.getClass(InternalNames.java:55)
at java.lang.Class.getDexCacheType(Class.java:476)
at java.lang.reflect.Method.getReturnType(Method.java:183)
at java.lang.Class.getDeclaredMethods(Class.java:678)
at com.gargoylesoftware.htmlunit.javascript.configuration.AbstractJavaScriptConfiguration.process(AbstractJavaScriptConfiguration.java:212)
at com.gargoylesoftware.htmlunit.javascript.configuration.AbstractJavaScriptConfiguration.getClassConfiguration(AbstractJavaScriptConfiguration.java:193)
at com.gargoylesoftware.htmlunit.javascript.configuration.AbstractJavaScriptConfiguration.<init>(AbstractJavaScriptConfiguration.java:67)
at com.gargoylesoftware.htmlunit.javascript.configuration.JavaScriptConfiguration.<init>(JavaScriptConfiguration.java:685)
at com.gargoylesoftware.htmlunit.javascript.configuration.JavaScriptConfiguration.getInstance(JavaScriptConfiguration.java:701)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.<init>(JavaScriptEngine.java:161)
at com.gargoylesoftware.htmlunit.WebClient.<init>(WebClient.java:326)
at com.gargoylesoftware.htmlunit.WebClient.<init>(WebClient.java:275)
at com.gargoylesoftware.htmlunit.WebClient.<init>(WebClient.java:265)
at com.gargoylesoftware.htmlunit.WebClient.<init>(WebClient.java:257)
at bd.maruf.myapplication.MainActivity.main(MainActivity.kt:32)
at bd.maruf.myapplication.MainActivity.onCreate$lambda$1$lambda$0(MainActivity.kt:22)
at bd.maruf.myapplication.MainActivity.$r8$lambda$VtPJx1mT1BVGpp5vWQWqcx_e4kM(MainActivity.kt)
at bd.maruf.myapplication.MainActivity$$ExternalSyntheticLambda2.run(D8$$SyntheticClass)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.ClassNotFoundException: Didn't find class "java.util.function.Supplier" on path: DexPathList[[zip file "/data/app/bd.maruf.myapplication-1/base.apk"],nativeLibraryDirectories=[/data/app/bd.maruf.myapplication-1/lib/arm, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at libcore.reflect.InternalNames.getClass(InternalNames.java:53)
at java.lang.Class.getDexCacheType(Class.java:476)
at java.lang.reflect.Method.getReturnType(Method.java:183)
at java.lang.Class.getDeclaredMethods(Class.java:678)
at com.gargoylesoftware.htmlunit.javascript.configuration.AbstractJavaScriptConfiguration.process(AbstractJavaScriptConfiguration.java:212)
at com.gargoylesoftware.htmlunit.javascript.configuration.AbstractJavaScriptConfiguration.getClassConfiguration(AbstractJavaScriptConfiguration.java:193)
at com.gargoylesoftware.htmlunit.javascript.configuration.AbstractJavaScriptConfiguration.<init>(AbstractJavaScriptConfiguration.java:67)
at com.gargoylesoftware.htmlunit.javascript.configuration.JavaScriptConfiguration.<init>(JavaScriptConfiguration.java:685)
at com.gargoylesoftware.htmlunit.javascript.configuration.JavaScriptConfiguration.getInstance(JavaScriptConfiguration.java:701)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.<init>(JavaScriptEngine.java:161)
at com.gargoylesoftware.htmlunit.WebClient.<init>(WebClient.java:326)
at com.gargoylesoftware.htmlunit.WebClient.<init>(WebClient.java:275)
at com.gargoylesoftware.htmlunit.WebClient.<init>(WebClient.java:265)
at com.gargoylesoftware.htmlunit.WebClient.<init>(WebClient.java:257)
at bd.maruf.myapplication.MainActivity.main(MainActivity.kt:32)
at bd.maruf.myapplication.MainActivity.onCreate$lambda$1$lambda$0(MainActivity.kt:22)
at bd.maruf.myapplication.MainActivity.$r8$lambda$VtPJx1mT1BVGpp5vWQWqcx_e4kM(MainActivity.kt)
at bd.maruf.myapplication.MainActivity$$ExternalSyntheticLambda2.run(D8$$SyntheticClass)
at java.lang.Thread.run(Thread.java:818)
Suppressed: java.lang.ClassNotFoundException: java.util.function.Supplier
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 20 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
2022-11-12 18:11:50.861 7773-7807 Surface bd.maruf.myapplication D Surface::disconnect(this=0xaddb7b00,api=1)
what I have tried :
cleaning and rebuilding that project
adding:
defaultConfig { multiDexEnabled true}
dependencies {implementation 'com.android.support:multidex:1.0.3'
3. deleting .gradel and .idea file
java.util.function.Supplier is documented as "Added in API level 24", hence code requiring it will not work on pre 24 SDK due to class absence.
Will try to solve this in HtmlUnit - check https://github.com/HtmlUnit/htmlunit-android/issues/9 or https://twitter.com/htmlunit for progress.
After some analysis and experiments i decide to not fix this. The js engine (Rhino) uses classes from the java.util.function package. Changing this is not a simple task and there are many other thinks to do.
So sorry, but i like to stay with android 7 as minimum requirement.
I followed the official instructions to Add an AAR as a dependency.
The build.gradle of the app has:
implementation files('libs/androidLibrary-release.aar')
The app builds and starts fine. However, it crashes when it uses a method of the library with the following in the logcat:
java.lang.NoClassDefFoundError: Failed resolution of: Lorg/joda/time/DateTime;
at net.mydomain.android.utility.getCurrentTime(SourceFile:1)
...
Caused by: java.lang.ClassNotFoundException: Didn't find class "org.joda.time.DateTime" on path: DexPathList[[zip file "/data/app/com.mydomain.foo-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
...
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
Method getCurrentTime() uses joda-time. The library has the following in its build.gradle:
implementation 'joda-time:joda-time:2.10.5'
I also tried api as follows to no avail:
api 'joda-time:joda-time:2.10.5'
Could anyone offer a tip to help find the culprit?
I used to import aar libraries as modules and they worked flawlessly. I have just updated Android Studio to Arctic Fox and the option to import an aar library is no longer available.
I am trying to create an application which utilizes Google Maps API. I followed the instructions (installed Google Play Services, created an API key, copied, and then pasted it in .xml file), but when I try to run this app, I get "Maps Demo (the name of the app) keeps stopping" message. (I use Nexus 5 API 28 AVD as an emulator) What might be reasons for that and how to solve this problem?
Logcat:
--------- beginning of crash
2018-11-24 09:07:55.191 2653-2803/? E/AndroidRuntime: FATAL EXCEPTION: Thread-6
Process: com.example.user.mapdirectionsample, PID: 2653
java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/http/ProtocolVersion;
at fa.b(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):3)
at ez.a(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):3)
at fb.a(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):15)
at com.google.maps.api.android.lib6.drd.al.a(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):6)
at ee.a(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):21)
at ee.run(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):8)
Caused by: java.lang.ClassNotFoundException: Didn't find class "org.apache.http.ProtocolVersion" on path: DexPathList[[zip file "/data/user_de/0/com.google.android.gms/app_chimera/m/0000000d/MapsDynamite.apk"],nativeLibraryDirectories=[/data/user_de/0/com.google.android.gms/app_chimera/m/0000000d/MapsDynamite.apk!/lib/x86, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at ac.loadClass(:com.google.android.gms.dynamite_dynamiteloader#14574084#14.5.74 (100700-219897028):4)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at fa.b(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):3)
at ez.a(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):3)
at fb.a(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):15)
at com.google.maps.api.android.lib6.drd.al.a(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):6)
at ee.a(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):21)
at ee.run(:com.google.android.gms.dynamite_mapsdynamite#14574084#14.5.74 (100700-219897028):8)
Thanks in advance.
I'm having an app and which works in android Lollipop and above, if I installed the app in android Kitkat device, the application crashes and show the error as below:
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.SplashActivity}: java.lang.ClassNotFoundException: Didn't find class "com.SplashActivity" on path: DexPathList[[zip file "/data/app/com.partner-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.partner-1, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2131)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2271)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1205)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5146)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.SplashActivity" on path: DexPathList[[zip file "/data/app/com.partner-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.partner-1, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2122)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2271)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1205)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5146)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
at dalvik.system.NativeStart.main(Native Method)
I tried a lot and was not able to fix it, most of the answers are for eclipse projects.
The reason for api 21 on is:
Android 5.0 (API level 21) and higher uses a runtime called ART which natively supports loading multiple DEX files from APK files. ART performs pre-compilation at app install time which scans for classesN.dex files and compiles them into a single .oat file for execution by the Android device. Therefore, if your minSdkVersion is 21 or higher, you do not need the multidex support library.
From this guide: https://developer.android.com/studio/build/multidex.html
I solved the class not found error by naming my classes like this:
[Activity(Name = "somepackage.custombuttonrenderer")]
public class CustomButtonRenderer: ButtonRenderer
{ }
Here is my answer: Why is my custom ButtonRenderer not working?
Update you app level build.gradle file:
implementation 'com.android.support:multidex:1.0.0'
And update you application class with :
#Override
public void onCreate() {
super.onCreate();
MultiDex.install(this);
}
This worked to me:
Add this in your APLICATION class.
#Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(base);
MultiDex.install(getBaseContext());
}
Explanation:
Android app (APK) files contain executable bytecode files in the form of Dalvik Executable (DEX) files, which contain the compiled code used to run your app. The Dalvik Executable specification limits the total number of methods that can be referenced within a single DEX file to 65,536
Versions of the platform prior to Android 5.0 (API level 21) use the Dalvik runtime for executing app code. By default, Dalvik limits apps to a single classes.dex bytecode file per APK. In order to get around this limitation, you can add the multidex support
I have a published app that gets reports about a ClassNotFoundExceptionfrom users that I went beyond my wits end trying to fix. I have not been able to reproduce this crash and similar instances of this error here on SO have either been cases of incorrect path to a dependency or a different package in the MainActivity than the manifest.
The issues with the wrong path to the dependencies are an Eclipse thing, while all the other errors could be easily fixed with Android Studio's "sync" and "clean project" (which I did to no avail).
I've triple checked all the package names and did not find any discrepancies.
Here is my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.johan.fsc">
<uses-permission android:name = "android.permission.VIBRATE"/>
<uses-permission android:name="com.android.vending.BILLING" />
<application
android:allowBackup="true"
android:icon="#drawable/logo"
android:label="#string/app_name"
android:fullBackupContent="true">
<activity
android:name="com.johan.fsc.MainActivity"
android:screenOrientation="portrait"
android:label="#string/app_name"
android:theme="#style/splashscreenTheme"
android:hardwareAccelerated="false"
android:largeHeap="true">>
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name = "com.johan.fsc.SettingsActivity"
android:theme="#style/PreferencesTheme"/>
</application>
Here is the error report I always get from users:
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.johan.fsc/com.johan.fsc.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.johan.fsc.MainActivity" on path: DexPathList[[zip file "/data/app/com.johan.fsc-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2426)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2595)
at android.app.ActivityThread.access$800(ActivityThread.java:178)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5624)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.johan.fsc.MainActivity" on path: DexPathList[[zip file "/data/app/com.johan.fsc-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newActivity(Instrumentation.java:1071)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
... 10 more
Suppressed: java.io.IOException: Failed to open oat file from dex location '/data/app/com.johan.fsc-1/base.apk'
at dalvik.system.DexFile.openDexFileNative(Native Method)
at dalvik.system.DexFile.openDexFile(DexFile.java:295)
at dalvik.system.DexFile.<init>(DexFile.java:80)
at dalvik.system.DexFile.<init>(DexFile.java:59)
at dalvik.system.DexPathList.loadDexFile(DexPathList.java:262)
at dalvik.system.DexPathList.makeDexElements(DexPathList.java:231)
at dalvik.system.DexPathList.<init>(DexPathList.java:109)
at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:48)
at dalvik.system.PathClassLoader.<init>(PathClassLoader.java:65)
at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:57)
at android.app.LoadedApk.getClassLoader(LoadedApk.java:370)
at android.app.LoadedApk.makeApplication(LoadedApk.java:562)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4818)
at android.app.ActivityThread.access$1500(ActivityThread.java:178)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1531)
... 7 more
Caused by: java.io.IOException: Failed to open oat file from /data/app/com.johan.fsc-1/arm/base.odex (error Failed to open oat filename for reading: No such file or directory) (no dalvik_cache availible) and relocation failed.
... 22 more
Caused by: java.io.IOException:
... 22 more
Caused by: java.io.IOException: Failed to remove obsolete file from /data/dalvik-cache/arm/data#app#com.johan.fsc-1#base.apk#classes.dex when searching for dex file /data/app/com.johan.fsc-1/base.apk: Permission denied
... 22 more
Suppressed: java.lang.ClassNotFoundException: com.johan.fsc.MainActivity
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 13 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available/output.
It would seem that the culprit is java.io.IOException: Failed to remove obsolete file from /data/dalvik-cache/arm/data#app#com.johan.fsc-1#base.apk#classes.dex when searching for dex file /data/app/com.johan.fsc-1/base.apk: Permission denied, but I have not found why it's being invoked for some users and not the majority, and more importantly--how to fix it.
Possible Cause 1: There is a typo in the manifest in the line android:largeHeap="true">>. xml line ends with >>. This may be preventing the Intent-Filter from executing.
Possible Cause 2: My guess is that the phone is searching for a class <PackageName>.<PackageName>.<ClassName> instead of <PackageName>.<ClassName> . So definitely <PackageName>.<PackageName>.<ClassName> is not found and ClassNotFoundException would be the result. In android studio, in the manifest, by default activity name is written like this: android:name=".<ClassName>" instead of android:name="<PackageName>.<ClassName>" . You can give this a try.
Most phones may be checking whether packagename is added before the class name in the manifest. If it is added then they don't add it while searching of the class. While few phones must be adding the package name by default while searching for the class. Hence, they cannot find your class.
Certainly, you're naming your activity wrong. An activity CAN NOT consist the package's name in its name attribute.
Since you're already defining the package name here
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.johan.fsc">
You shouldn't mention that name here
<activity android:name="com.johan.fsc.MainActivity"
The only situation you should use package name along with a class's name is when the java class resides in a different package, as done in import statements.
Even if your activity is not present in the src folder and is instead present in a nested folder, android studio should handle the linking of manifest and the activity itself. Yet again, package name shouldn't be used there.