Remove MainActivity created by Android Studio - android

How can edit the manifest so the MainActivity is removed?
I've been following some tutorials to learn to create android apps and I've got stuck in the Activity subject.
When I create a project the Software gives me an deafult activity called MainActivity. I've deleted it so I could name my class as I wish.
However, even after deleting the files the activity still presents on the Manifest. I've tried to play around, deleting some words, but with no success.
This is the current manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="androidedx.example.activitylifecycle">
<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=".Activity1"></activity>
<activity android:name=".Activity2" />
<activity android:name=".MainActivity">-------<<<<<<0!!!!!!!!!!!!!
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
It has this row of content that the android studio warns me about, that I'm poiting with -------<<<<<<0!!!!!!!!!!!!!.
I recall my question: How can edit the manifest so the MainActivity is removed?


Remove the MainActivity Java file and Manifest Declaration and activity1 set as a LAUNCHER Activity
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="androidedx.example.activitylifecycle">
<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=".Activity1">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Activity2" />
</application>
</manifest>


You can create manifest like this if you want to use other activity
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="androidedx.example.activitylifecycle">
<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=".Activity1">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Activity2" />
</application>
</manifest>
This below code make activity as Main and first launched :
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />

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I can't open the app on my phone because it says it doesn't have a launch activity so I can open it.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.frases.coquinha">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
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<activity
android:name=".MainActivity"
android:exported="false" />
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android:name=".tela2"
android:exported="false" />
<meta-data
android:name="preloaded_fonts"
android:resource="#array/preloaded_fonts" />
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</manifest>

You do not have a suitable <intent-filter> for that on either of your <activity> elements.
You need this <intent-filter> in whichever of your <activity> elements represents your launcher activity:
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
And, you would need to switch to android:exported="true" for that <activity> element.

Login screen isn't popping up

So I have a problem where I made a GUI for login window in android studio.But when I try to start the app,it doesn't pop up.Also I have made a splashcreen which I want to pop up before login screen and it does.Also,I didnt do anything in the LoginActivitiy file which was created.I can't find the problem.Here is the manifest file.
Btw Im a beginner,go easy on me :)
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.projekat2021">
<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/Theme.Projekat2021">
<activity android:name=".MainActivity" />
<activity android:name=".SplashActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".LoginActivity" />
</application>
</manifest>

The activity must be exported or contain an intent-filter - even though there's an intent filter

IDK why it's happening, there's an intent filter in there.
I think I'm missing a tiny problem, that another point of view can detect faster/
thanks!
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.caloriecalculator">
<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=".Login"></activity>
<activity android:name=".MainActivity" />
<activity
android:name=".Register"
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>

How can I organize my layouts in my Android manifest file

Hi guys I'm new in Android Studio, I'm actually on an project and I was wondering how I can organize my layouts let me explain, I have three layouts and I don't know how to display the first then the second and the third in that order:
-Splash Screen
-principal
-mainActivity
Here is my Android Manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.recipe">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<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=".principal" />
<activity android:name=".RecipeActivity" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".SplashScreen"
android:theme="#style/Theme.AppCompat.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
I hope I was clear and I know it's easy to do but as I said I'm new.
Thanks for your help guys.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.recipe">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<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=".principal" />
<activity android:name=".RecipeActivity" />
<activity android:name=".MainActivity">
</activity>
<activity
android:name=".SplashScreen"
android:theme="#style/Theme.AppCompat.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Change your manifest to this. Your app will start from splash screen. After that it depends that you want to go to which activity. By using intent you can go from one activity to another one.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.recipe">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<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=".principal" />
<activity android:name=".RecipeActivity" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".SplashScreen"
android:theme="#style/Theme.AppCompat.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
The rest of the intent and app navigation is your doing , good luck .

duplicate registration for activity "androidstutio"

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="android.testlocalserver">
<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">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".confirmActivity" />
<activity
android:name=".confirmActivity"
android:label="#string/title_activity_confrim"
android:theme="#style/AppTheme.NoActionBar"></activity>
</application>
Below is the error:
error:at android:name=".confirmActivity"
duplicate registration for activity
android.testlocalservice.confirmactivity
I don't why this is happenning and i read some answers and says select the mode !!
how can i set the mode of activity ,why ?

As the error says, you have two activities with the same name.
Remove one of them:
<activity android:name=".confirmActivity" />
<activity
android:name=".confirmActivity"
android:label="#string/title_activity_confrim"
android:theme="#style/AppTheme.NoActionBar"></activity>

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