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Unable to assign activities in androidmanifest.xml as required for correct activity sequence

Intro - Sequence
Welcome Activity (only once per user first time open)
No internet connectivity (Check at time of launch of application)
Main Activity (Launch of application)
Current androidmanifest.xml sequence -
<activity
android:name="com.example.myapp.no_internet_alert"
android:screenOrientation="portrait">
<intent-filter>
<action android:name=".MainActivity"/>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity
android:name="com.example.myapp.WelcomeActivity"
android:screenOrientation="portrait">
</activity>

Is this what you're trying to do?
<activity
android:name="com.example.myapp.no_internet_alert"
android:screenOrientation="portrait"/>
<activity
android:name=".MainActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.myapp.WelcomeActivity"
android:screenOrientation="portrait"/>

Trouble understanding how to set my login activity to the launcher activity in the Android manifest

I want to change my manifest so that the Login Activity is the first activity to start on the phone. The login activity checks the sharedpreferences to see if a user has login info saved. If they do it logs them in. Im pretty sure I need an intent-filter in login activity with <category android:name="android.intent.category.LAUNCHER" /> but I dont get what I should put for the action.
Heres my manifest
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".DisplayMessageActivity"
android:label="#string/title_activity_display_message"
android:parentActivityName=".MainActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.incubatorcle.dinahealth.MainActivity" />
</activity>
<activity
android:name=".UserOnboardActivity"
android:label="#string/title_activity_user_onboard" >
</activity>
<activity
android:name=".LoginActivity"
android:label="#string/title_activity_login" >
</activity>
</application>

You need:
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
ACTION_MAIN action indicates this is the main entry point and does
not expect any intent data.
CATEGORY_LAUNCHER category indicates
that this activity's icon should be placed in the system's app
launcher.

Your MainActivity need to look like this:
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.yourpacgagename.MAINACTIVITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
Your Login activity need to look like this:
<activity
android:name=".LoginActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

As your question is answered by #wariaten
Here is another way to do the login check
Add a third activity (where you check the SharedPreferences and launch the LoginActivity or the HomeActivity) and set it as the launcher as suggested by #wariaten

Android app with 2 launcher icons with separate taskAffinity

I have app with 2 launcher icons and 2 different Activities. Manifest file is as like below:
....
<activity
android:name=".MyActivity"
android:label="#string/app_name"
android:icon="#mipmap/ic_launcher"
android:taskAffinity="my.package.com.MyActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MySettings"
android:label="#string/settings"
android:icon="#mipmap/ic_launcher"
android:taskAffinity="my.package.com.MySettings">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
....
I want MyActivity to be default screen to be opened after installing, so i used .category.DEFAULT.
action.MAIN and category.LAUNCHER are to show two separate launcher icons (1 for MyActivity, 1 for MySettings).
Problem: When i open MyActivity, MySettings screen is also gets opened. I want each launcher icon to open its corresponding Activity only. I have used taskAffinity for each Activity to solve problem but it did not work. I think to make taskAffinity work, Activity must be started with flag Intent.FLAG_ACTIVITY_NEW_TASK which i can not in my case (both are launch Activities).
I have also tried to use android:launchMode="singleTask" but it did not work either.
How to make each launcher icon to open only its Activity ?
UPDATE: Sorry, i realized MyActivity does not open MySettings, it seemed so though. MyActivity did not have UI, so it showed blank screen which is similar to MySettings. taskAffinity works correct. I have added android:theme="#android:style/Theme.NoDisplay" to MyActivity to hide UI.

Just use two different images for your apps to launch.
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MySettings"
android:label="settings"
android:icon="#drawable/ic_launcher2"
android:taskAffinity="my.package.com.MySettings">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

I solved that way:
<activity
android:name="andynaz.android.hyperfcalc.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="andynaz.android.hyperfcalc.MainActivity2"
android:label="#string/app_name"
android:icon="#mipmap/ic_launcher2">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
I did not use the taskAffinity, but I indicated the fully specified name of Activity classes (other than using 2 different images).

App widgets removed in home launcher if manifest activity intent-filter changed to different activity

I have an app with widgets. I created a new activity for a splash screen to show for a second and declared the new activity in my manifest with the intent-filter tags. I changed this:
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
to this:
<activity
android:name=".SplashScreen"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
</activity>
When I launched my app to the emulator, my widgets disappear from the home launcher and I have to re-add them. I want to add a splash screen to my app but I don't want my users to have to re-add their widgets, if possible. Any suggestions?

How to specify which activity starts on app launch?

I have an app with 3 different activities in it. When I launch the app one of the activities always starts first. But I want a differnt activity to start before the one that is currnetly starting first.
How would I change this to make a differnet activity start first?

Open your AnroidManifest.xml file and set the Launching Activity using the intent-filter tag as follows,
<activity android:name=".LaunchingActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

You need to add an intent filter to the activity you want to start on application launch in your app's AndroidManifest.xml:
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>

You need to make changes in AndroidManifest.xml file...
<application
android:icon="#drawable/image"
android:label="#string/app_name" >
<activity
android:label="#string/app_name"
android:name="define the activity which you want to start first here" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".FirstActivity" >
</activity>
<activity android:name=".SecondActivity" >
</activity>
<activity android:name=".ThirdActivity" >
</activity>
</application>
Hope this will help you....

In your AndroidManifest.xml put the following:
<activity android:label="#string/app_name"
android:name=".TestActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
The intent-filter inside the activity tells Android which Activity to launch.