Default Activity not found in Android Studio

Question

I just upgraded to Android Studio 0 2 8 and I am getting an error that says  Default Activity not found  when I try to edit the run configurations   When I launch Android Studio I get this error  Access is allowed from event dispatch thread only   The activity I am using is a fragment activity   So far I ve tried rebuilding and invalidate caches restart  Both were of no use   Please let me know what I can do to fix the problem

User · Answer

You can get Android Studio not to complain by going to the "Edit Configurations" menu (tap "Shift" three times, type "Edit Configurations"), then change Launch Options > Launch to "Nothing".

I'll probably add a generic activity containing instructions, just to avoid any confusion.

User · Answer

this happened to me because I capitalized the paths in the manifest  changed     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    to   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    and it was fixed

User · Answer

In my case  it worked when I removed the  idea folder from the project  Project  ida  and re-opened Android Studio again

User · Answer

I have tried all solutions  but not working at all  than I have tried to disable Instant run in my android studio   Go to Android Studio Settings or Preferences  for MAC  -  Build Execution Deployment -  Instant Run    uncheck the Instant run functionality and than after click sync project with gradle files from file menu  now run your build

User · Answer

Many possibilities can be happened for this kind of case  Default Activity not Found  If all code are fine  especially on Manifest  just just need to Invalidate Cache and restart the studio   But sometime it is happened when you have duplicate activity declaration on manifest  not only for the Main activity  it is also triggered by child activities as well   That happened with me  Default activity not found because i have duplication child activities on manifest  after deleted that  everything is well

User · Answer

Have you added ACTION MAIN intent filter to your main activity  If you don t add this  then android won t know which activity to launch as the main activity   ex    lt intent-filter gt         lt action android name  android intent action MAIN   gt         lt action android name  com package name MyActivity   gt         lt category android name  android intent category LAUNCHER    gt   lt  intent-filter gt

User · Answer

Default Activity name changed  like SplashActivity -  SplashActivity1  and  work for me

User · Answer

In Android Studio  Go to edit Configuration    Select the app   choose the lunch Activity path   apply  OK  Thanks

User · Answer

In some case you can have model with some category field  if you will refactor it in all places  it may refactor it in manifest file and then and the tag xml will became invalid

User · Answer

There are two steps you can take    Go to configurations and enter the name of activity to be launched If it is still not working Disable Instant Run

User · Answer

Following did the trick for me  From Run -  Edit Configuration

User · Answer

I just experienced the same error in Android Studio 1 5 1  and just found the source of the problem  I am not sure whether the cause was a human error or some strange glitch in the behaviour of the IDE  but none of the existing StackOverflow questions about this subject seemed to show anything about this so I figured I post it as an answer anyway   For me  either one of my team members or the IDE itself  had changed the launcher activities manifest entry  causing it to look like this            lt activity             android name  com rhaebus ui activities ActivitySplash              android launchMode  singleInstance              android screenOrientation  portrait  gt               lt intent-filter gt                   lt action android name  android intent action MAIN    gt                   lt id android name  android intent id LAUNCHER    gt               lt  intent-filter gt           lt  activity gt    While it should  in fact  look like this            lt activity android name  com rhaebus ui activities ActivitySplash              android launchMode  singleInstance              android screenOrientation  portrait  gt               lt intent-filter gt                   lt action android name  android intent action MAIN    gt                   lt category android name  android intent category LAUNCHER    gt   lt  -- Change Here -- gt               lt  intent-filter gt           lt  activity gt    So please double  triple  quadruple check the format of your launcher activity in the manifest and you might be able to save yourself some time   Hope this helps   EDIT  I strongly suggest people not to go with the answers that suggest to manually select a launcher activity inside the configuration options of your module  as this caused the application to no longer be shown in the list of installed apps on both the Samsung Galaxy S5 Neo and the Samsung Galaxy S6  at least for me

User · Answer

Right click on the project and choose Open Module Settings  Go to the Sources tab in your module  Find your src folder  Right click on it and mark it as Sources    This solved the error in my case

User · Answer

I had the same problem while importing a project into Android Studio  probably caused by the fact that the project has been developed on an earlier version of Android Studio than currently installed on my computer   What solved it was simply choosing   File - gt  Invalidate Caches   Restart     and then selecting Invalidate and Restart

User · Answer

In Android Studio  right click on the project and choose Open Module Settings  Then go to the Sources tab in your module  find the src folder  right click on it and mark it as Sources  blue color    EDIT  There is no sources tab in later versions of Android Studio  but you can edit the build gradle file instead  https   stackoverflow com a 22028681 1101730  thanks for comment Josh

User · Answer

Press app -- gt  Edit Configurations After that change value in Launch on  quot Nothing quot

User · Answer

If you don t have the tab and you started with an empty activity try this  Below is a sample code example        lt application android label   string app name  gt        lt activity android name   HelloActivity  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  application gt      Now go to your AndroidManifest xml file  Next  copy the intent filter from this code  Look at your manifest file really good and paste the intent filter in the exact place it is in the code above   after the  yourActivityName  part of the manifest    I hope this helped

User · Answer

When I clicked  Open Module Settings   there was no  Source  tab  I think because that s been removed for newer versions of Android Studio  I m on 0 8 14    So I had to do this instead   Add these lines to the build gradle file inside the android         block    android               sourceSets           main java srcDirs     src main  lt YOUR DIRECTORY gt             After editing the file  click Tools   Android   Sync Project with Gradle Files   Credit to this answer and this comment

User · Answer

Please make sure in manifest that package name is same with your main activity

User · Answer

I figured it out  I mistakenly added  final keyword in activity declaration  Once I removed it everything works  public  class SplashActivity extends AppCompatActivity

User · Answer

Check if there is any duplicate tag in your AndroidManifest xml file

User · Answer

Modify  Workspace xml   press Ctrl   Shft   R to search it    Modify the activity name with package name  Make sure to change  name  USE COMMAND LINE  to value  false  Reload the project   Done

User · Answer

I ran into the same issue today and was going through the answers here   For me the difference was that yesterday it worked fine  so I figured it could not really be a configuration issue  neither configuration nor Version of Android Studio changed   Fortunately  I tried a restart of Android Studio before trying any of the other answers  and luckily that solved the issue   So for all people out there who run into this  first thing to try is to restart Android Studio and only if that does not solve the issue try the other answers here

User · Answer

If you changed name of directories  class structure  for example com dir sample to com dir sample1  after that don t forget to change package com dir sample  to com dir sample1

User · Answer

For those like me who were struggling to find the  Sources tab      Here you have to mark your  src  folder in blue  first click in Mark as  Source  then in your src folder   and you re good to go

User · Answer

My problem came down to an additional error that was popping up sometimes  stating Manifest Merger failed with multiple errors in Android Studio What ultimately was causing my problem was the fact that there were multiple manifests  a debug Manifest  and a manifest in the new module I had just imported   and they were not merging correctly due to this  After seeing this answer  I was able to analyze the merged manifest and find the cause of the issue and fix it

User · Answer

If you are still getting an error that says  Default Activity not found  when you try to edit the run configurations  even after executing   Invalidate cache and Restart   Then try deleting the Settings Preferences folder     lt  USER HOME DIR  gt   AndroidStudioPreview3 2   or on Mac     Users  lt USER NAME gt  Library Preferences  AndroidStudioPreview3 2

User · Answer

In my case  this happened because of sudden shutdown of the system  I followed these steps   Close Android Studio Go to   C  Users my user name AndroidStudio4 0 system caches   Delete  quot caches quot  folder Relaunch Android Studio

User · Answer

In Android Studio switch to Project perspective  not Android perspective   Make sure that your project follows the gradle plugin s default structure  i e  project dir app src main java     Delete all build folders and subfolders that you see  In the toolbar click Build -  Clean Project  then Build -  Rebuild Project  Try to run the project

[android] Default Activity not found in Android Studio

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