Screenshot of ErrorI am randomly getting an error when running my code. It was working a few hours earlier, but when I restarted my computer I can't run the code. I never changed my AndroidManifest, so I don't see why this error would occur. I tried rebuilding the project and invalidating the caches but it still doesn't work.
AndroidManifest.xml
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity"/>
<activity android:name=".StartUpActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".LogInActivity" />
<activity android:name=".SignUpActivity"></activity>
</application>
There is not error log all its says is "Default activity not found"
Also the red MainActivity says
"Unresolved class 'MainActivity' less... (Ctrl+F1)
Validates resource references inside Android XML files."
It's a long shot, but from the information that you've provided, I can say that I've had a degree of success doing the following:
File -> Invalidate Caches / Restart
It seems that you have a couple of errors there, and a little more information would make it easier to assist you (maybe show your full AndroidManifest.xml so that we can check other aspects of the file for errors).
1. Select Edit Configurations from the drop down next to run button.
2. Under launch options > Launch select Specified activity.
3. Another field "Activity" will appear select your default activity.
4. Click OK and sync project with gradle files and it should work.
This is my first time out on the site and also with Android studio, so admittedly, these may be very simple answers that I'm missing but I've got a couple problems going on and I think they're all related. First, Android studio doesn't recognize the glass when it's plugged in via usb. My computer recognizes it and I can find it in the device manager and it says it has the most up to date drivers installed. I emailed support and got back some code I had to insert into AndroidManifest.xml which I inserted but, still Android Studio can't find it.
I've been looking around online quite a bit and it looks like every project is supposed to have an activity_main.xml file under app/src/main/res/layout but I don't have this folder or file at all. Is that a problem and if so, can I just insert a folder and/or file? Would I need to rebuild the project again for it to be usable?
Also, when it tries to build it immediately gets hung up and the error is 'The markup in the document preceding the root element must be well informed. I don't have any idea what this means or how to fix it. Perhaps this has something to do with not having an activity_main.xml?
This is what I've got in the Android Manifest
<<<<<<<Original<manifestxmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.admin.helloglass">
<application
android:allowBackup="true"
android:label="#string/app_name"
android:icon="#mipmap/ic_launcher"
android:supportsRtl="true"
android:theme="#style/AppTheme">
</application>
</manifest>
=======<manifest xmlns:android="http://schemas.android.com/apk/res/android">
<uses-permission android:name="com.google.android.glass.permission.DEVELOPMENT"/>
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main"
android:icon="#drawable/ic_glass_logo">
<intent-filter>
<action android:name="com.google.android.glass.action.VOICE_TRIGGER" />
<action android:name="android.intent.action.MAIN"/>
<category android:name="com.google.android.glass.category.DIRECTORY"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<meta-data
android:name="com.google.android.glass.VoiceTrigger"
android:resource="#xml/voice_trigger" />
</activity>
</manifest>>>>>>>> Added
Thanks for your help.
I'm new to android and I have encounterded a problem.
The console said that "Could not identify launch activity: Default Activity not found".
I have add
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
in manifests.
And I have tried Invalidate caches/Restart,still not worked.
And the class file which contains the main activity turn green in android studio. I don't know what that means.
This is my manifests file.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mrrobot.mycoolweather" >
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme" >
<Activity android:name="com.example.mrrobot.mycoolweather.activity.ChooseAreaActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</Activity>
</application>
</manifest>
The chooseAreaActivity is the one I want to use as launcher activity.
For main activity in your manifest you have to add this with category LAUNCHER (First Activity on launch app):
<activity
android:name=".MainActivity"
android:label="YourAppName"
android:theme="#style/AppTheme.NoActionBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
For other activity you have to change category to DEFAULT:
<activity
android:name=".OtherActivity"
android:theme="#style/AppTheme.NoActionBar" >
<intent-filter>
<action android:name="package.OtherActivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
Check this Activity and this Start Another Activity
So your code is:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mrrobot.mycoolweather" >
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme" >
<activity
android:name=".activity.ChooseAreaActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Although the question is kind of outdated, I would add the following to all the given answers:
For multi-module projects check carefully that you modify the Manifest corresponding to the Configuration you are trying to run.
Had the same problem and spent 20 minutes just to discover that I was trying to run wrong configuration (with an Application in ModulbeB, while thinking that I was running one from ModuleA).
And sometimes you are working on other module default runnable module changes so you have to change it.
Sometimes it is solved just restarting Android Studio
I had the "Default Activity not found" problem a couple of times and I could solved restarting my android Studio.
If you see that error occur after upgrading your IDEA, upgrading Android Studio version, or Generating a new APK, you may need to refresh the IDE's cache.
File -> Invalidate Caches / Restart...
In your manifest file there was wrong element name (Activity change to activity) declared
<Activity android:name="com.example.mrrobot.mycoolweather.activity.ChooseAreaActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</Activity>
Change it to:
<activity android:name="com.example.mrrobot.mycoolweather.activity.ChooseAreaActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
When I upgraded Android Studio to 2021.1.1.23 somehow my Run Configuration was switched from app to models, producing this error. Switching back to app resolved the issue for me.
i had these issues with my project:
Default activity not found
xml intellisense was not working
kotlin standard functions were not detecting
All my above issues were resolved by Deleting System cache of Android Studio 3.3 at the home path, and it's working nicely for me,,
Steps:
exit Android Studio
Go to path > C:\Users\YOUR_WINDOW_USER_NAME.AndroidStudio3.3\system
Then you have a \caches folder, delete this caches folder
Now open Android Studio and load your project
Worked for me.. i wasted couple of hours resolving this issue and finally it got resolved in this way.
Exit your android studio IDE. Then locate the "caches" folder in .AndroidStudio3.2 folder.
Location
C:\Users\YOUR_USERNAME\.AndroidStudio3.2\system\caches
For example.
Let's assume say YOUR_USERNAME is called Admin.
C:\Users\Admin\.AndroidStudio3.2\system\caches
Delete the caches folder and start your android studio IDE.
I have tried solutions here and other questions
clean & rebuild & invalidate and restart
make sure that activity has LAUNCHER as category
delete Android cache folder
at End, activity tag was has <activity android:name="com.exmaple.todo.MainActivity" />
when i changed it to <activity android:name=".MainActivity" /> app worked.
I hope it help you if other solution not work.
If your activity is in a different module (e.g. ':library) und you forgot to specify the subproject in the dependencies{} scriptblock of your :app module,
the manifest of :library and therefore the activities it declares, are not imported.
dependencies {
api project (':library')
You may check whether all activities show up in your app-debug.apk by using the following Android Studio menu command:
->Build->Analyze APK->app-debug.apk
Now open the AndroidManifest.xml and check its activity declarations.
I got this error in android 12+ after changing launch activity adding intent-filter but not make it exported.
so not forget.
android:exported="true"
It is likely that the action is not in the manifest.
This is the fix
Attached is an image
My main activity was not declared in Android Manifest File. That's the reason which came that error. This error come because of a declaration problem of Android Manifest file. Please check it. :D
This happened to me aswell took me ages to figure out why, but a weird bug I spotted is that if you run the app with breakpoints in your code without debugging mode it will cause this error to happen.
Quick fix for now: Only use breakpoints for degbugging mode.
Check your duplicate initialize activity in your AndroidManifest.xml
Like bellow:
<activity android:name=".nim.qiaqia.lota.LotaProduct"/>
<activity android:name=".nim.qiaqia.lota.LotaOrderDetail"/>
<activity android:name=".nim.qiaqia.main.activity.RechargeListLotaActivity"/>
<activity android:name=".nim.qiaqia.lota.MiningCoinLota"/>
<activity android:name=".nim.qiaqia.lota.LotaOrderDetail"/>
that can causes ""Default Activity not found" also. So, remove it and see. its works! :)
In my case android manifest was correct. I tried to invalidate Caches and restart but not worked. Then Rebuild project and it also did not work.
Then I realized that last night I added a new library to build Gradle, it was this:
implementation 'com.yalantis:eqwaves:1.0.1' And after removing this everything worked fine.
TIP: "Always have a track of things you do in your project, otherwise you will end up wasting your time"
If you only enabled building the app via app bundle, then this error might also occure when you try installing it as a default APK. Change the deployment option to APK from App Bundle and you are good to go.
I have decided to try to learn some Android App Development however I am unable to follow even the most basic tutorial. My problem is that what ever I seem to do, the compiler complains about about the Manifest.
Failure [INSTALL_PARSE_FAILED_MANIFEST_MALFORMED]
However, this happens when the project is completely unchanged from when Android Studio created it.
The Manifest is below which is also unchanged but is copied below any way.
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="Toby.projecttoolkit" >
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".Home"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Can somebody shed some light on why this might be happening? Any help in this area would be really appreciated.
Many thanks
Toby
I had a similar issue, and I resolved it by changing the package name to begin with a lowercas later i.e use toby.projecttoolkit instead of Toby.projecttoolkit.
Apart from that the Manifest file looks fine.
Refactor the package, clean, refresh and build the project. Make sure your project as no errors and try to run it.
I have a strange problem with my Android app. When I start it from Netbeans, the app gets installed on my device (attached via USB). After that nothing happens. I also can't find the app anywhere on the device!! (no icon, no nothing).
Still I know the app has been installed, because under the android settings, where it says "Manage Applications" (or something) the app is now listed and I can uninstall it.
I've tried the whole procedure with a blank HelloWorld app, which worked fine. Here an icon got created o the device and the app was started correctly by NetBeans.
So I guess there is something wrong with my app causing it not to appear in the phone's launcher?
EDIT:
Here's the manifest:
<?xml version="1.0" encoding="utf-8"?>
<uses-sdk android:minSdkVersion="4" />
<application
android:icon="#drawable/icon"
android:label="#string/app_name" android:debuggable="true">
</application>
you need to add below line in your Main activity in androidmanifest file
<activity android:label="#string/app_name"
android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>