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action bar not showing extending from a different module

I've created a :core module that stores some of my basic activities, some of these should show an actionbar, in the manifest I've something like this:
<activity
android:name=".components.home.HomeActivity"
android:theme="#android:style/Theme.Holo.NoActionBar">
</activity>
<activity
android:name=".components.activities.ContactsActivity"
android:theme="#style/AppTheme.TranslucentActionBar" >
</activity>
I don't understand why but now that I've created another module :extension that includes :core, the actionbars in that activities seems to not show.
The manifest of extension is very simple:
<application
android:name=".App"
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme"
tools:replace="android:icon" >
<activity
android:name=".components.activities.TestActivity"
android:label="#string/title_activity_test" >
</activity>
<activity
android:name=".components.home.WelcomeActivity"
android:label="#string/title_activity_welcome"
android:theme="#style/AppTheme" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Usually this is a problem that concerns themes, but to me everything seems fine, I don't understand why it works when I build simply :core, but it doesn't work when building :extension project

I've spent too much time when the answer was easy.
Pressing Ctrl+click made me see how the theme was made, I've simply switched parent to the old layout.
<style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">

Every Activity of my application is shown as an app on its own

Just like the title says, for some reason which I dont understand, Every Activity I create in my application is shown as an icon for an application on the phone's app menu.
Could someone please help me solve this wierd problem?
If you need some code just ask for it (I dont know which code is related with these kind of stuff).
Thanks!

In your manifest remove these lines from all Activities except the one you want to open on:
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
Example:
<activity
android:name="your.package.name.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<!-- This line declares this Activity as the start point -->
<action android:name="android.intent.action.MAIN" />
<!-- This line adds a launcher icon -->
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="your.package.name.OtherActivity"
android:label="#string/app_name" >
</activity>

In your manifest file you must have set launcher intent-filter for all of your activities.. Keep launcher intent-filter only in launcher activity..

Android first app, all activities visible in menu

I just created my first Android app, all works fine, but all of the activities are shown on my Android menu. What did I do wrong?
Screenshot: imgur.com/9CmXU
I want to have one icon, directing to MainActivity, not all activities
<!-- language-all: lang-html -->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.myApps.birthdaymeter"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/my_logo"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".BirthdayMeter"
android:label="#string/title_activity_birthday_meter" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".AboutWindow"
android:label="#string/title_activity_about_window" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".ShowResult"
android:label="#string/title_activity_show_result" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
This is my manifest, changing logo didn't help

The <intent-filter> tag is used to describe the type of Intents that each Activity will respond to. The "android.intent.action.MAIN" action says that this Activity is an entrance point for your Application (think the main method that a java program requires). The "android.intent.category.LAUNCHER" category tells the OS to display the Activity in your list of Applications. Adding the DEFAULT category is ok, but effectively the same as omitting the <intent-filter> tag completely (which I find to make for much cleaner and easier to read code). You should only be using the <intent-filter> tag with these two actions and categories on the Activity that starts when a user opens your app. If wanted an Activity within your application to be able to respond to some special intents, you would use the tag to define which it responds to.
Here's a link to the google dev pages to help you learn more about Intent Filters.
http://developer.android.com/guide/components/intents-filters.html
Here's the documentation for the <intent-filter> tag. It's not the easiest to understand though.
http://developer.android.com/guide/topics/manifest/intent-filter-element.html
And here's the docs for the Manifest file and the Intent class. Both of these are good for reference if you're not sure about which tags to use in your Manifest. Good luck!
http://developer.android.com/guide/topics/manifest/manifest-intro.html
http://developer.android.com/reference/android/content/Intent.html

You phrased your question extremely generally, so I am not sure what to answer. It seems like you haven't called nameOfActivity.this.finish() when you launched another activity

If you post your manifest file I can help a little more, but it looks to me like you have not declared your activities correctly.
It should be setup somewhat like this:
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name="Activity1"></activity>
<activity android:name="Activity2"></activity>
<activity android:name="Activity3"></activity>
</application>
Essentially, create an application declaration, and then include each activity within it.

Having a single application name, and not separate activity names

I have an android application with three activities: Loading, Main, Credits.
But when I try to run and look into the emulator, I have three icons: Loading, Main, Credits.
How can I just have a single Application name? And where do I set it?

Set in android manifest file in application level.
android:label="#string/app_name"
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".Loading"
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=".Main" />
<activity android:name=".Credits" />

In your AndroidManifest.xml, you just need to set <intent-filter> for only one Activity other Activities don't need this tag.

Can I set the name of the app to something other than the label of the activity with the intent-filter?

I have an app with four activities. I have set the intent-filter on one of them so it will be displayed first to the user when he starts the app. It has a label that says "Add expense".
Now the name under the icon for the app in the phone says "Add expense".
I would like the activities to have their different labels because they are displayed in the menu at the top of each activity and help the user understand what the activity is about. But I want the app name to be something other than the label of the activity with the intent-filter.
Is that possible?
Part of my manifest:
As you can see I've tried to set android:label="#string/app_name" on the application level but that doesn't work. The label on the activity is displayed under the icon anyway.
<application
android:icon="#drawable/ic_money_bag"
android:label="#string/app_name"
android:theme="#android:style/Theme.Holo.Light" >
<activity
android:name=".AddExpenseActivity"
android:label="#string/add_expense_header" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".ListExpensesActivity"
android:label="#string/list_expenses_header" >
</activity>
<activity
android:name=".AddExpenseAccountActivity"
android:label="#string/add_expense_account_header" />
<activity
android:name=".ListExpenseAccountsActivity"
android:label="#string/list_expense_accounts_header" />
</application>
Regards,
Mattias

You can use setTitle(String s) in each activity to change the name that appears in the title bar dynamically. So for you setting it in onCreate to whatever you want might suffice.
setTitle("Hello StackOverflow");

Try giving
<intent-filter android:label="#string/app_name">
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
When the label is specified for the activity then i will be shown with the same label in Launcher
What can u do is give label to intent-filter