Error type 3 Error Activity class does not exist

Question

I have an IntelliJ Android project  that I successfully imported to Android Studio 0 4 0  It works perfectly if I don t change anything in manifest  However  when I want to change the launcher activity and run  it fails with this error   Launching application  com trackingeng LandingActivity  DEVICE SHELL COMMAND  am start -D -n  com trackingeng LandingActivity        -a android intent action MAIN -c android intent category LAUNCHER Starting  Intent   act android intent action MAIN       cat  android intent category LAUNCHER  cmp com trackingeng LandingActivity   Error type 3 Error  Activity class  com trackingeng LandingActivity  does not exist    When I click Sync Project with Gradle files  it outputs   Project Sync The project  TrackingEng  is not a Gradle-based project   Run settings

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After all these solve suggestions i still had not solved my this problem  And then i remembered my phone has 2 ANDROID User Interface  One of them is using in casual  another is private things of yours  When i download my projects to phone  downloads both of them  I deleted my project in casual one but had not private one  Everything works fine when i delete the private one  So If you have 2 android ui  you should delete all of them and download again

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If you are getting this error while developing an instant app then go to Device Settings -  Apps and clear the instant app from device

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If you have uninstalled the application manually from the device and you have multi user set up  this error could happen  The application needs to be uninstalled from all the users in the device

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That might also happen if you have by mistake two launcher Activity in your AndroidManifest xml like this        lt activity android name   ActivityA  gt           lt intent-filter gt               lt action android name  android intent action MAIN   gt               lt category android name  android intent category LAUNCHER   gt           lt  intent-filter gt       lt  activity gt       lt activity android name   ActivityB  gt           lt intent-filter gt               lt action android name  android intent action MAIN   gt               lt category android name  android intent category LAUNCHER   gt           lt  intent-filter gt       lt  activity gt    Just leave the correct one LAUNCHER Activity

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Be warned that if you have multiple Profiles set on the device  your app might already exist in one of the other Profiles    Uninstalling the app from all the Profiles resolved the issue for me

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This usually occurs when you uninstalling the App you are developing  Check whether you have activated the guest account  if so switch the account and uninstall the app  switch back to Admin user  You   and carry on

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If you test your app on a smartphone  which has 24 hours secure app remove  like LG G6  you have to uninstall app manually in settings  because it is in bin for 24 hours after uninstalling  so Android Studio thinks that app is installed  but it is in app thrash on your smartphone  It worked for me

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In my case  I don t know why  the smartphone was blocking my app  To solve it I went to Configuration --  Application   found my app and pressed  Unistall   I went to configuration becouse my application was not appearing on menu

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I resolve the problem by Edit Condifiguration - gt  Deploy- gt  Select default apk https   i stack imgur com 8xuLG png

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If you create a new project from an existing project   build gradle  defaultConfig           applicationId  xxxxxxxxx    xxxxxxxxx should be  package name  com demo app  from AndroidMenifest xml           minSdkVersion 16         targetSdkVersion 28         versionCode 1         versionName  3 0 0          ndk               abiFilters  armeabi-v7a    x86                then click sync in the android studio

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None of the solutions above worked for me  I tried same app with different device it worked  Finally I noticed that the application is disabled    Go to setting apps  on the phone  If it is disabled  remove it   That was the solution for my case

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This happens when you do the following   connect your device emulator  run the app from Android Studio  AS  use test the app and uninstall it from the device while it is still connected to your computer  try to run the app again from AS   AS thinks you still have the app in your device   tl dr - To resolve this  you can simply disconnect your device after uninstalling the app and reconnect it

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I took reference from  jayeffkay s comment   It works for me after I deleted the gradle cache files located in       your proj directory  gradle 2 10   2 10 is the gradle version used in my case

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for me  on android 6 when i uninstalled the app it actually went to disabled instead of being removed from device   Settings   Apps   click on your app and uninstall  this fixed it for me

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For me  on Android Studio 3 1 2 on Ubuntu 16 04  I met the same issue  This happens when my colleague changed the package name  and it is okay on his machine  Neither clean project nor rebuild project work   I use Sync project with gradle files button on the top pannel of Android Studio and everything works well

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I had Error type 3  I managed to fix it by adding the following code below in AndroidMainfest xml        lt activity android name   GameActivity  gt           lt intent-filter gt               lt action android name  android intent action MAIN    gt                lt category android name  android intent category LAUNCHER    gt           lt  intent-filter gt       lt  activity gt

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I had the same error message when I switched to guest profile in my emulator  I switched back to owner profile and it worked

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If you re not careful and you re trying to disable something in your app manifest make sure you don t disable the app      lt application android allowBackup  false  android enabled  true        I accidentally set enabled to  false  instead of allowBackup  Wasted 2 hours searching for a solution

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I had same issue  My problem fixed when I disabled instant run for Android Studio 2 1 1

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Even I had the same problem but none of the above solutions worked for me  The problem was that  I had froze the particular app which I was trying to run via Titanium Backup due to which I got the above error  I tried both in Eclipse and Android Studio   After the realization I just unistalled the app and then ran it again   Problem Solved  -

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This worked for me   Go to module settings -  Falvors -  Application id -   Add your package name

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Below command worked for me  Sometime partial uninstallation of the app also causes this   Execute below command in terminal cmd  adb uninstall  lt package name gt    Then  try to reinstall the application  It should work

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Had the same error  with a much newer version of Android Studio  version 4 1    A fresh install of Android Studio   a fresh  quot basic Activity quot  template would run into error type 3 for hours  I am on win 10 - my problem was how to kill the gradle cache  A good answer above showed a screen snapshot from gradle  but i didn t find it in Android Studio 4 1  Also the env vars for gradle had not been set   and the commandline for gradle didn t work  So    here is how it worked finally  I went to C  Users myusername   gradle  This has subdir  quot caches quot   I deleted everything inside  Worked    I did close Android Studio before  restarted and then it worked nicely   Ah forgot one thing- i run the device emulator  defau  t device   i e  no physical device yet

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In my case  I had defined defaultConfig two times    I don t know why but double check it in case of a mistake

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Follow Steps Below Go to  Mobile setting   Apps   Your App   More   Hit Uninstall app for all users   Reason   Because you are having multiple users in your phone and you had uninstalled that app for only one   ENJOY

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Android Studio 3 1 3  January 2019  After trying just about everything on here without success  this is the only thing that worked for me  Delete the virtual device and re-download it

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If your app has only two word package name like com example  then all your class must be mentioned with full path in menifest like  com example SplashActivity  instead of relative path like  SplashActivity  change this and delete all your build folder and re-run app   Hope it will help  Thanks

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i just go to Build   Rebuild Project and my problem is solved

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For Android 9 devices   if your app is not installed at device already    1  build apk 2  move apk to device and install it 3  return to Android Studio and press Run - it will launch app

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I also faced the same problem somewhere in the past  Such problems actually occurs when we do some refactoring like - renaming  moving files within the project etc  Renaming and Moving files require changes in the gradle file so whenever you rename or move some file just clean the project      Build -  Clean Project   Cleaning the project just removes the  class files and recompiles the project  Basically  it forces a project rebuild    Sometimes such types of errors did not cleaned on cleaning project then try to uninstall the app from the device  either it is emulator or physical one  and run the app again  Hope this will help you  it helps me 50  times   Note - Whenever you got any error just don t go to google  Clean the project if this not work do what you want to google

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Just doing a clean build did the trick for me   To do a clean build  do   Build - gt  Clean Project   Then do a build or straight run on device

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In my case there was next reason   I have 2 users  me and Guest  and app was installed on both of them but deleted only at first   when I switched to Guest screen and delete app from there  app installed ok   hope this will help someone

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My package name was like  barisciftci PatternApplier   So changing it to all lowercase solved my problem  so now it looks as  barisciftci patternapplier  and it works really fine

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For me  the problem was that AndroidStudio thought that the app was still on the device   To fix it    restart the adb daemon  in a terminal or command prompt  enter   adb kill-server adb start-server  try to launch your app  if it still doesn t work  check out this answer    make sure the platform-tools of the Android SDK is added to your system path variables

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If anyone is seeing this   This fix worked for me as nothing from the above worked    Remove the installed debug APK from your phone In Android Studio  go to Build  choose Build APK s  Put this generated APK on your phone and launch it Exit this app and try to debug your app again from Android Studio   This worked for me

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Just in case anyone runs into my issue and has no luck with the other solutions    I was trying to start an activity through adb for FireTV while debugging Amazon launcher integration  However  my project had 60 different build variants  multi-platform  multi-app project  and the ApplicationId didn t match any classpath since the runtime package  and classpaths  were different from the applicationId   I was trying to run adb shell am start -n com myappid example packageone packagetwo com myappid example packageone packagetwo MySplashActivity   Of course I had tried many combinations with com runtimepath example  since I had the added challenge of a different applicationId in my build gradle and another at runtime   What finally helped was this post https   stackoverflow com a 36255727 5970652  Which revealed a different format   com myappid example com runtimepath example packageone packagetwo MySplashActivity  So if you have a different runtime classpath try specifying with the build gradle applicationId before the slash and the runtime classpath afterwards    You can also get these values from BuildConfig APPLICATION ID and this getLocalClassName   respectively if you want to log them in logcat

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When I got this problem I always try this solution and it works   Instant Run disable   Build - gt  Clean Project  File - gt  Invalidate Caches   Restart   But I found an exception this once  This solution doesn t work for me  Then I find out the problem is Emulator cash  I just do Wipe data and Cold boot now and the problem is solved

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I use Android Studio 3 2 Beta 5  faced with the same issue  Go to  File - gt  Invalidate Caches   Restart      Solved problem for me

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Some times application install on Guest user on your mobile  So try to switch Guest and uninstall the application   In addition  try to execute the following command to uninstall application adb uninstall package  Your package Name

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In my case  it was because the app I was trying to launch was installed for a different user on the device  Go to Settings -  Apps  All apps  and and select the app  Click on the overflow menu and select  Uninstall for all users   This should solve the problem

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As others have noted  this problem can be caused by an attached device emulator while uninstalling the app and AS connection still exists   On my end  I just delete all the build folders  under app and project dirs  in the project  and relaunch the application on the device emulator

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I faced this problem lately  and tried all suggestions above  and problem was not saved  Finally I changed a NDK  and problem was solved

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This happened to me using react-native run-android because my package name did not match my app ID  Just add --appId YOUR APP ID

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May be helpful for someone --  Sometimes when testing on a device  the app doesn t uninstall properly  To verify and fix this    Go to Settings  Go to Apps  Select your app   here  you can verify that your app is not uninstalled properly   Open the overflow menu on the top right and select Uninstall for all users  Done  Try to install then launch your app again

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I mistakenly added extra empty  lt application gt  tag in AndroidMenifest xml  which was causing this problem  I removed that and now everything is working fine

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I face this problem after rename my package     so simplest one is go to File-  Invalidate caches Restart

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I solved it by simply deleting the app - gt  build  folder and then rebuilding the project  The build folder is automatically recreated after the project is built so there s no risk in deleting it

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None of the above worked for me   I had a version of the app on the device that could not be uninstalled as it was corrupt somehow   I had to factory reset the device   Not too bothered cause it was a just a dev device

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The best solution which worked for me was Gradle - gt  Tasks - gt  Install - gt  Uninstall All

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I had the same issue and I solved it refactoring my activity launcher  just change the class name and it works

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My solution is  close the  instant run  of android studio     instant run  can be found with the following steps  Preferences -  Build Execution Deployment -  Instant Run   and then uncheck the checkbox  Enable Instant Run to hot swap

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The file name of the SharedPreferences must be suffixed with the name of the current flavor to prevent the active compilation variant of a product from accessing the preferences of defined users for another active compilation with the same preference name   Although each compilation package is different  it may be that when using flavorDimensions  access to user preferences is being crossed and get the Error type 3 while launching MainActivity  app getSharedPreferences    BuildConfig FLAVOR  shared pref 3   Context MODE PRIVATE    GL

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a simple hack is to rename your package   eg MainActivity to ApplicationMainActivity

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Check if you are building hidden version  That   s intended behavior for hidden app   If you want to build regular version  you need to change Build Variant in Android Studio Build   Select Build Variant  change it to regular

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I had the same issue  and this is how I fixed it    Go to Gradle   Tasks   Install   UninstallAll

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Check Application id in the Gradle file  I had the same issue because I accidentally changes application id while refactoring views name

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I think another reason that issue happen is that it is not fully deleted for all users on the device   Go to Settings -  Apps -   Your Apps -  Click to the 3 dots on the top right -  Uninstall for all users  It works for me  It happen especially you change the icons of the app or messing around with the AndroidManifest xml file

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Here s yet another answer  which I haven t seen in the list so far  as nothing else worked for me   Future searcher  if you ve exhausted all options have a look at this one -   For me I had been playing with Android Work Profiles by making use of the Shelter App - I had copied my own application into the work profile    I had to remove my app from both the regular profile as well as the work profile  and then the app would launch properly   Somehow the existing package inside the work profile was getting in the way of the IDE deploy

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Faced this problem in android studio 3 5 1 Took me a day to solve this problem Tried everything including cleaning cache restart and renaming package name as well  So if any of above did t work than try this      Just go to gradle   Tasks   Install   UninstallAll  Here is the link  Error type 3  Activity Class       does not exist

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Though it s too late  but if someone face the same thing that i went through   For me  the problem occurred due to my Emulator  My emulator was running in SafeMood  When i tried most of the solutions above  and these solutions didn   t worked for me  The thing that worked for me was restarting my Emulator without SafeMood  First it was started in SafeMood automatically and problem occurred  Then when i disable SafeMood and restart my Emulator it did the trick

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In my case i uninstalled application from phone it after that the problem began but  the below command worked for me   Execute below command in terminal cmd  adb uninstall  lt package name gt    package name something like com example applicationname Then  try to reinstall the application  It should work

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Got to android app build gradle and search for   buildTypes                  You might have something like  buildTypes       debug                         release                         customBuildType                         Chose the buildType you want to start and then start the App the following  react-native run-android --variant  buildType  --appIdSuffix   buildType     So   react-native run-android --variant debug --appIdSuffix  debug

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I had the same error after renaming refactoring  What I did was add the applicationId property attribute to my build gradle file  and set its value to the application package    In build gradle   android   defaultConfig       applicationId  com example myapp

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Try changing the name of the Activity in your AndroidManifest xml file   Right now it says    lt activity android name  LandingActivity   gt    Try either adding a period to the beginning of the Activity s name    lt activity android name   LandingActivity   gt    Or adding the package name to the beginning of the Activity s name    lt activity android name  com trackingeng LandingActivity   gt    It also may be a problem that your package name has only two components separated by periods  your package name is  com trackingeng   a more standard package name would be  com trackingeng app

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In my case this was being caused by ndk abiFilters when compiling for arm  To fix it I had to add the following  splits  section to app build gradle s android block   splits       abi           enable true   enables the ABIs split mechanism         reset     reset the list of ABIs to be included to an empty string         include  armeabi-v7a    arm64-v8a    armv7l          universalApk true

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For me  I tried most of the answers  and didn t work  My Android Studio version is 4 0 1  I changed my git branch to the master branch  and then returned to my own branch  and it worked  This time I could run my branch  So weird I know

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This happens when the app has not been uninstalled properly   Use the below plugin of Android Studio to uninstall the app from the device  in case you were unable to find your app inside the settings of the device   ADBIdea  https   github com pbreault adb-idea  ADBIdea adds the following ADB commands to Android Studio and Intellij     ADB Uninstall App ADB Kill App ADB Start App ADB Restart App ADB Clear App Data ADB Clear App Data and Restart ADB Revoke Permissions ADB Start App With Debugger ADB Restart App With Debugger   There are two basic ways to invoke a command   Through the Tools- Android- ADB Idea menu By searching for  ADB  in  Find Actions   osx  cmd shift a  windows linux  ctrl shift a

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I m solving simply  don t delete build folder     deleting all files   apk in   yourapp app build intermediates split-apk debug slices  running the app compare a popup message  Application Installation failed   Do you want to uninstall the existing application   click Ok rebuild the project run again the project

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I got this error  What I tried to fix the error  didn t work  were   Clean Project Rebuild Project Restart Android Studio  Solution was simple   just uninstall the app on your Emulator Phone and hit  quot Run quot  on Android Studio

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I would face this problem when uninstalling the app via the device  i e  dragging the app to the  Uninstall  option   But here is the proper way to uninstall   Use the   gradlew uninstallAll command  This will prevent the Error  Activity class  HomeActivity  does not exist  error   Update   If you   re lazy you can use the abbreviation for this task     gradlew uA   Or define aliases for common gradle tasks in your  bash profile  doing so will save time  typing  and you won   t have to remember every command nor worry about typos  I suggest doing this

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For me  there was no space left on your device

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I d like to share the trick that helped in my case  I uninstalled the application from the device and nothing of clean rebuild Android Studio restart operations didn t help    Since Android Studio thinks that the application is still installed on the device and doesn t deploy it  you can force the installation using the ADB   adb install -r  lt your application from apk gt    where -r means reinstall the app  keeping its data

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Besides the cases that the first upvoted comment provided  there is another case can cause this error  the output apk file cannot be replaced by Android Studio  you can manually delete it and build again  it should work   If you did not change the output path  the default apk output path is  Your Project Path  app build outputs apk debug app-debug apk

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For me it was a very specific problem  I ve got a Lg g5 to test my application on  and to reset my apps data I uninstalled it on the phone  but the phone has a  nice  feature to don t uninstall apps immediatly so you might can reinstall them within one day  So the app was installed but not usable disabled  after removing the app from the phone completely it worked

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Keep package name same in manifest file and in build gradle Module app  it resolved my problem

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Issue was caused by uninstalling the app while the device was still plugged in  What happens is the device disables the app rather than removing it     Go to your app list on your device and uninstall the app from there  You will see that it is currently marked as disabled  This is why you cannot run the app because Android Studio fails to install it as it thinks it already exists

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Sometimes this happens once you rename the project s root directory  just delete the  idea folder of your project and reopen it with Android Studio  it will works

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The App is already installed for Another user  Please try to uninstall the same app for all the user  Then try   Or you can try after running adb command   adb uninstall PACKAGE NAME   where PACKAGE NAME is the full name such as com example myapp

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I face the same issue and I think the solution is very simple than what I think it was just go to your manifest and change the package name than copy the same package name into your application iD in the Gradle defaultConfig   applicationId  quot your package name here quot    that s it  good luck

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I tried all the solutions above  nothing helped me  Then I read all the  Run  Log  There I saw this line    Exception occurred while executing  android os ParcelableException  java io IOException  Requested internal only  but not enough space    My problem was  no internal free space to install the app  So  I deleted some files and app get installed successfully

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In my case  I actually change the package name  and it started causing this issue   I have tried many trick but here I am describing what actually worked for me    Delete your build folder it also includes the clean so no need to clean it  Try to restart android studio if this doesn t work then invalidate the cache too  if it still give you error then try to wipe out the data of your emulator  hopefully this will resolve the issue    Make sure your activity name is correct also make sure the package name is correct in manifest file

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I face the similar Problem please follow the below steps  it will help you   1- Clean your Project 2- Delete your build directory 3- Restart your Android Studio 4- Rebuild the project 5- it will run successfully     Thanks

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I have a Samsung Galaxy  Searching in the settings above didn t work because it didn t show up at all in my Apps settings    I found the application on my phone by typing the name of the app in the search field  I realized it was in the  Work  using Mobile Work  profile and removed it  You can find the settings for the profile by going to Settings- Work profile- Apps  I hope this helps somebody who may not find it the same way that many of the other answers stated it could be found in the settings

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I have faced to the same issue recently  remove the app in android machine solved my problem

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I faced a similar problem after refactoring  This is what i did to resolve this issue    Cleaned the Project Deleted the Build directory Restarted Android Studio Rebuild the Project Run Optionally  Go to the files menu on android  click on  Invalidate Caches   Restart     uninstall the app on your phone and try again    And everything worked fine  I think the key is to restart your IDE     Hope this helps you or anyone else   Edit 1  If the above steps don t work for you  then deleting Gradle cache seems to be a solution  as pointed out by  Yasitha     Edit 2 As suggested by a couple of users in the comments below  sometimes the issue can be resolved by completely removing and reinstalling the app from your device  Simply type adb uninstall  lt package gt  in terminal to completely remove app from the device   Edit 3 As mentioned in Abhishek s Answer  one should also try deleting the app from your device in case multiple users are set up on your device  Simply go to  Mobile Settings  gt  Apps  gt   Your App   gt  More  gt  Uninstall App for All Users  UPDATE for Android Studio 2 1 and up  When running Android Studio 2 1 and up you can also encounter this issue when you have the instant run option enabled in your preferences  is enabled by default     To disable this option go to the Preferences option in the Android Studio top menu and look for Instant Run so you can uncheck the first checkbox on that screen     Anyway that fixed it for me  Originally pointed out by user  yusufonder  I discovered this was the issue since gradle install still worked

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I have LG Stylus and in my test phone  application isn t remove permanently  In Settings -  Application I found debug app  which I try install and debug by AS  with adnotation turn-off  When I remove app from my phone  error disappeard

[android] Error type 3 Error: Activity class {} does not exist

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