Develop Reference

Android app showing 2 icon in device while testing

I'm new to android and Developing very basic App. I have completed my development but when ever I debug my app in device. It shows 2 icon. I'm facing this problem after implementing Splash Screen in my app. Please suggest me how to overcome. My manifest
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:icon="#mipmap/icc"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<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=".Login_page">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

In your manifest file -
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
This piece of code means which activity will first start when you launch the app. But you have put this code in both of your activities hence Android provides a separate launcher for both the activities and you see two icons.
So remove the above code from one of the activities. Just let it remain in the Activity you want to start first when your app launches.

TO have a icon on the launcher screen you need action of the activity to be action_main and category to be launcher and your both activity qualifies the criteria for this.
You should change your login_activity category to default or simply remove the category.
You can start your login activity from splash activity.
I hope it helps you.

Android:Understanding how does an activity start when application launches

I have pasted the code of my Androidmanifest.xml,how does android decides which activity to launch when application starts ? In this case its the mainactivity. What changes to I need to make if I want to launch AnotherActivity when application launches?
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.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="com.example.AnotherActivity"
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>

The MAIN element specifies that this is the "main" entry point to the application. The LAUNCHER element specifies that this activity should be listed in the system's application launcher (to allow users to launch this activity).
<activity
android:name="com.example.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>
Just remove the intent filter from the next activity!!

When the user selects your app icon from the Home screen, the system calls the onCreate() method for the Activity in your app that you've declared to be the "launcher" (or "main") activity. This is the activity that serves as the main entry point to your app's user interface.
You can define which activity to use as the main activity in the Android manifest file, AndroidManifest.xml, which is at the root of your project directory.
The main activity for your app must be declared in the manifest with an that includes the MAIN action and LAUNCHER category. For example:
<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>
Based on this, we can conclude that you currently have a faulty configuration. Only one activity can have the Intent filter for Main (so you should remove the <intent-filter> from your .MainActivity if you want to use AnotherActivity as you "Home" Activity).

<activity
android:name="com.example.AnotherActivity"
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" ></activity>

As stated in our conversation, you want to show a determinate action at launch, with is own functions and layout. The solution is to use one Activity which inflate Fragment1 or Fragment2, based on your condition.
Dealing with Fragment is very difficult, but when you will master them, you will have fun. There are few example on the net about Fragment, but i tell you this: read and practice is the only way you will learn something. Copy and paste from other source code / example will not help you. Follow this links:
link 1
link 2 with sample
link 3 for supporting tablets
Good luck!

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..

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

How to change the startup activity in android?

I have two activities namely login and calendar in my Application. Currently my startup activity is "calendar". I want to run the login as first activity not calendar.

The startup activity [Launcher Activity] is declared in the projects' AndroidManifest.xml file
Look for that activity tag in the manifest which looks like this
<activity android:name=".Main"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
Look at the attribute android:name. Main is the class which is launched when the app starts. Currently your calendar activity name should be there. Change that to the .classpath of your activity that you want to launch.
That should do it. You may also want to do the hello world application in the tutorials and go through the docs a little to see how Android Applications work.

Add Intent filter to the Activity in which you want startup.
In your case Modify the AndroidManifest.xml file as follows
<activity android:name=".login"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>

remove the intent-filter code from calendar Activity tag in manifest and add it to the Activity you wanna load first
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
I mean paste it in the activity you like to run as default.
<activity
android:name="com.example.gridviewimages.AnotherActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
Where as
From the docs
category -- Gives additional information about the action to execute. For example,
CATEGORY_LAUNCHER means it should appear in the Launcher as a top-level application, while
CATEGORY_ALTERNATIVE means it should be included in a list of alternative actions the user can
perform on a piece of data.
MAIN means that this activity is the entry point of the application, i.e. when you launch the application, this activity is created.

You want the Application element of the Android Manifest file. You can see details here.
Look at the name attribute, this points to the Application class.