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Android Automotive: Could not identify launch activity: Default Activity not found

I have just created my first Android Automotive project:
when I run AndroidAutoDemo.mobile module it works fine:
Unfortunately when I switch to AndroidAutoDemo.automotive module I get:
Could not identify launch activity: Default Activity not found
Error while Launching activity
Failed to launch an application on all devices
This is the Android Manifest file in AndroidAutoDemo.automotive module (left as default):
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidautodemo">
<uses-feature
android:name="android.hardware.type.automotive"
android:required="true" />
<application
android:allowBackup="true"
android:appCategory="audio"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.AndroidAutoDemo" />
</manifest>
This is my mobile emulator:
How can I fix?

To run automotive app you need Automotive emulator and Automotive flavor with Manifest like below. Also there is no Automotive emulator provided by Google yet but you can get other open source emulator from like Polestar https://developer.polestar.com/sdk/polestar2-sys-img.xml
and Volvo https://developer.volvocars.com/sdk/volvo-sys-img.xml
You don't have to add new activity
if want to understand you can go through example source code
https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:car/app/app-samples/helloworld/
`
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="androidx.car.app.sample.helloworld"
android:versionCode="1"
android:versionName="1.0">
<!-- Various required feature settings for an automotive app. -->
<uses-feature
android:name="android.hardware.type.automotive"
android:required="true" />
<uses-feature
android:name="android.software.car.templates_host"
android:required="true" />
<uses-feature
android:name="android.hardware.wifi"
android:required="false" />
<uses-feature
android:name="android.hardware.screen.portrait"
android:required="false" />
<uses-feature
android:name="android.hardware.screen.landscape"
android:required="false" />
<application
android:label="#string/app_name"
android:icon="#drawable/ic_launcher"
android:extractNativeLibs="false">
<meta-data
android:name="com.android.automotive"
android:resource="#xml/automotive_app_desc"
tools:ignore="MetadataTagInsideApplicationTag" />
<meta-data android:name="androidx.car.app.minCarApiLevel"
android:value="1"
tools:ignore="MetadataTagInsideApplicationTag" />
<service
android:name="androidx.car.app.sample.helloworld.common.HelloWorldService"
android:exported="true">
<intent-filter>
<action android:name="androidx.car.app.CarAppService" />
</intent-filter>
</service>
<activity
android:name="androidx.car.app.activity.CarAppActivity"
android:theme="#android:style/Theme.DeviceDefault.NoActionBar"
android:exported="true"
android:launchMode="singleTask"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data android:name="distractionOptimized" android:value="true"/>
</activity>
</application>
</manifest>
`

Each Manifest file should include information about available activities and launcher activity. Launcher activity needs to be defined with some additional Intent filters, for example:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.car">
<uses-permission android:name="android.car.permission.CAR_POWERTRAIN" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#android:style/Theme.DeviceDefault.NoActionBar">
<activity android:name="com.example.car.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

Android App ist running on Device in USB-Debug-Mode but not after APK-Install

I am very new In Android Development and developed a "Time Stamp Clock - App" which reads NFC-Tags.
Everything fine, it is running on Device via USB-Debug-Mode without Errors as expected. When I build APK and install on the same Device, the installing is without errors, but after that, the open-button is grayed out and inactive and there is no desktop-icon to launch. In the APPS Overview it is displayed, but not able to open.
Can someone tell me, what can i do, to figure it out, what is going wrong there?
EDIT:
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.comidoszeiterfassung">
<uses-permission android:name="android.permission.NFC" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-sdk android:minSdkVersion="21"
android:targetSdkVersion="30"></uses-sdk>
<application
android:name=".myGLOBAL"
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/Theme.ComidosZeiterfassung"
tools:ignore="Instantiatable">
<activity
android:name=".ui.login.MainActivity"
android:label="#string/title_activity_main"
android:theme="#style/Theme.ComidosZeiterfassung.NoActionBar"
android:exported="true">
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<data android:mimeType="text/plain" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".ui.login.LoginActivity"
android:label="#string/app_name"
android:exported="true">
<intent-filter>
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="android.intent.action.MAIN" />
</intent-filter>
</activity>
</application>
</manifest>
It is a simple structure in the app. LoginActivity as Start-Activity and a TabbedActivity for the NFC-Stuff.

Play Store says app is incompatible with phone tested on

The Play Store says that my app is incompatible with all the devices that I have, but that also includes the phone that I tested it on. Below is my Manifest file. I tested it on my Nexus 5X running Nougat, but the Play Store says that the app is incompatible with that phone of mine. Thanks a lot !
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.health4everyone.thejdeep.healthpal">
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="#####" />
<activity android:name="com.heath4everyone.thejdeep.healthpal.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.heath4everyone.thejdeep.healthpal.Home"></activity>
<activity android:name="com.heath4everyone.thejdeep.healthpal.Hospitals"></activity>
<activity
android:name="com.heath4everyone.thejdeep.healthpal.Restaurants"
android:label="Map">
</activity>
<activity android:name="com.heath4everyone.thejdeep.healthpal.ActivityTracker"></activity>
<activity android:name=".Settings" android:label="#string/app_name">
<intent-filter>
<action android:name="com.health4everyone.thejdeep.healthpal.Settings" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.heath4everyone.thejdeep.healthpal.SearchFoodByRestaurant"
android:label="Search Restaurant">
</activity>
</application>
</manifest>
Edit : Removed the API key :)

Application package installer has stopped

I have copied my Manifest XML File. I am just not able to figure out the error. The application is running on my Redmi 1S but it is not running on my Micromax Canvas A110 I have already tried all the solutions which are already there on Stackoverflow related to this.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gilpix.am"
android:versionCode="1"
android:versionName="1.0" android:installLocation="auto">
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="19" />
<uses-configuration
android:reqTouchScreen="finger" android:reqKeyboardType="undefined"/>
<uses-feature
android:name="android.hardware.touchscreen" />
<uses-permission
android:name="android.permission.INTERNET" />
<supports-screens
android:anyDensity="true"
android:largeScreens="true"
android:normalScreens="true"
android:smallScreens="true" android:xlargeScreens="true" android:resizeable="true"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" android:uiOptions="splitActionBarWhenNarrow">
<!-- Splash screen -->
<activity android:name="com.gilpix.am.Splash"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:theme="#android:style/Theme.Black.NoTitleBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.gilpix.am.Login"
android:label="#string/app_name"
>
</activity>
<activity android:name="com.gilpix.am.Logind"
android:label="#string/logind_name"
android:uiOptions="splitActionBarWhenNarrow"
>
</activity>
<activity android:name="com.gilpix.am.U_home"
android:label="#string/app_name"
android:uiOptions="splitActionBarWhenNarrow" >
</activity>
</application>
</manifest>

clean your project and if it doesn't work than close
the project and restart, create new apk and install

This error is come due to different android version of your both android phones.
Please check the configuration for both the phones and change according to that in manifest.xml file
android:minSdkVersion="11"
android:targetSdkVersion="19"
Thanks

Android Application isn't installed after deployment

I've developed an application using Eclipse and when I run it on my Droid Ultra the application runs when running through Eclipse. To my understanding when that happens the application should be installed on the device. However, when I unplug the device and try to run the app by going through my phone applications it displays a toast message saying "App isn't installed". Does anyone know why this is happening? Is this a code problem, an environment issue, anything?
Here is my manifest if it helps?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="edu.ggc.thinkfast"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="20" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" android:permission="android.permission.BLUETOOTH">
<activity
android:name=".MainScreen"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:noHistory="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".FactScreen"
android:screenOrientation="portrait"
android:noHistory="true"></activity>
<activity android:name=".CategoryScreen"
android:screenOrientation="portrait"></activity>
<activity android:name=".TimerScreen"
android:screenOrientation="portrait"
android:noHistory="true"></activity>
<activity android:name=".QuestionScreen"
android:screenOrientation="portrait"
android:noHistory="true"></activity>
<activity android:name=".NextQuestionScreen"
android:theme="#android:style/Theme.Dialog"
android:screenOrientation="portrait"
android:noHistory="true"></activity>
</application>

Do you already have the app installed previously on the device?If so please uninstall the existing app and try again with eclipse.The problem may be due to incorrectly signed certificates.