Develop Reference

My application icon doesn't appear when I debug or Run 'app' on android studio, what happened?

My application icon no longer appears on my android phone screen when I debug like it used to. I know this has something to do with the androidmanifest.xml file. I've looked up several solutions for me but those solutions resulted in my application being unable to even run in the first place.
What could be the problem here?
I have tried the solutions mentioned here:
Android Studio: App icon doesn't appear in the home screen or app list
Launcher icon missing in Android
This is my android manifest file:
<?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="sg.edu.singaporetech.teamproject">
<uses-permission android:name="android.permission.INTERNET" /> <!-- allow usage of camera for Android -->
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/> <!-- to run foreground service for steps -->
<uses-feature
android:name="android.hardware.camera"
android:required="true" />
<application
android:name=".StepsNotification"
android:allowBackup="true"
android:icon="#drawable/exersize"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.AppCompat.Light.NoActionBar">
<activity android:name=".DispatchActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW" />
</intent-filter>
</activity>
<activity android:name=".profile.editProfile"
android:screenOrientation="portrait"
android:configChanges="orientation|keyboardHidden" >
<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"
android:theme="#style/AppTheme.NoActionBar"
android:screenOrientation="portrait"
android:configChanges="orientation|keyboardHidden">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".registration.RegisterActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".home.HomeActivity">
<!--<intent-filter>-->
<!--<action android:name="android.intent.action.MAIN" />-->
<!--<category android:name="android.intent.category.LAUNCHER" />-->
<!--</intent-filter>-->
</activity>
<receiver android:name=".StepsBroadcastReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
</intent-filter>
</receiver>
<service android:name=".StepsService"/>
</application>
</manifest>

I think the problem is in the line,
android:icon="#drawable/exersize"
In the application tag, app icon must he placed in the mipmap folder as it meant for the app icon only. Mipmap must have all scales of the icon.

Android manifest merging: removing LAUNCHER intent-filter doesn't take effect

In my android app I use a library project and I use one of it's activities. However in the library project that activity has MAIN action and LAUNCHER category intent-filter. So I added that activity to my manifest and removed the intent-filter. The manifests seem to be correctly merged into build/intermediates/manifests/full/debug/AndroidManifest.xml, and the activity looks as expected (without the intent-filter):
<activity
android:name="com.michaelrnovak.util.logger.Logger"
android:configChanges="orientation"
android:label="#string/show_log" >
</activity>
However when I start the app from AndroidStudio in the emulator, then instead of my AlertsActivity, the library's Logger activity is launched. What am I doing wrong?
This is the manifest of the library:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.michaelrnovak.util.logger"
android:versionCode="8"
android:versionName="1.5">
<uses-permission android:name="android.permission.READ_LOGS" />
<application
android:icon="#drawable/icon"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity android:name=".Logger"
android:label="#string/app_name"
android:configChanges="orientation">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="7" />
</manifest>
and my app's manifest has the following relevant activity definitions:
<activity
android:name=".AlertsActivity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="#string/app_name"
android:launchMode="singleTop" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" /> </intent-filter>
</activity>
<activity android:name="com.michaelrnovak.util.logger.Logger"
android:label="#string/show_log"
android:configChanges="orientation"
tools:replace="android:label"
>
<intent-filter tools:node="removeAll" />
</activity>

Have you tried tools:node="remove" on the category node only? From my experience, it seems to work.
Something like this:
<activity android:name="com.michaelrnovak.util.logger.Logger"
android:label="#string/show_log"
android:configChanges="orientation"
tools:replace="android:label"
>
<intent-filter>
<category tools:node="remove" android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>

I tried many ways on similar situation like you. I figured out that I must add tools:node="replace" in the Activity node to remove intent-filter's specific action and category. Try this :)
<activity
android:name="com.michaelrnovak.util.logger.Logger"
android:label="#string/show_log"
android:configChanges="orientation"
tools:replace="android:label"
tools:node="replace">
<!-- Rewrite the intent-filter you want -->
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

android Application installed but not showing on screen

My application is installed on real device as well on emulator but it does not display on my device screen as well on emulator screen. I mean to say here that whenever an app is run or installed on a device it opens up but here my app does not open it just installed and no error are shown or forced stop is not there. I even checked my download file where every app info is shown and it is present there. Can anyone help???? Thank you in advance.
This is my Manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.hide"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.hide.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.hide.Info"
android:label="#string/title_activity_info" >
<intent-filter>
<action android:name="com.example.hide.Info" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.example.hide.Help"
android:label="#string/title_activity_help" >
<intent-filter>
<action android:name="com.example.hide.Help" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.example.hide.Next"
android:label="#string/title_activity_next" >
<intent-filter>
<action android:name="com.example.hide.Next" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>

Make sure you specify the launcher activity for the app in your AndroidManifest.xml file:
<activity android:name=".YOURACTIVITY" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
More information here: http://developer.android.com/training/basics/activity-lifecycle/starting.html

If you have <data android:mimeType="image/*" /> in intent filter of your Launcher activity, then remove it.
just place following two lines < action and category) as:
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>

If you can see it in app list, but not shown on app screen, so I suppose you could be just missing 'android:icon="#drawable/your_app_icon"' setting in your manifest file.

Android can't see application icon after installation

I developed an application with Android studio and there is a very strange behavior:
After the installation I cant see the application (not the icon nor the name) in all apps list, but I can see that in recent apps and in manage apps.
I sent the APK to myself in email and after the installation the open option was disabled.
I checked the ic_launcher icons and they are fine.
What can cause that? Any ideas?
EDIT:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="my.package.name"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".SplashActivity"
android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="http" android:host="my.package.name.host" />
</intent-filter>
</activity>
<activity android:name=".MainActivity"
android:configChanges="orientation"/>
<activity android:name=".LoginActivity"
android:windowSoftInputMode="adjustPan"
android:configChanges="orientation"/>
</application>
</manifest>

For me having the following lines in the intent-filter were enough to make the ICON appear in the launcher with the other apps
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
When you open the apk, that was sent by email or transfer to your phone you will see the INSTALL option and after succesfully installed the OPEN option is there.

Put tags at two intent-filters like here
<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>
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.BROWSABLE"/>
<category android:name="android.intent.category.DEFAULT"/>
<data android:scheme="http" android:host="qr_3d.com"/>
<data android:scheme="https" android:host="qr_3d.com"/>
<data android:scheme="app" android:host="qr_3d.com"/>
</intent-filter>
</activity>

Make sure the filter is as
should be MAIN and not activity_main, etc.
also remove min / max SDK setting line...
This worked for me

App is installed and has two icons

I made a android app and it worked very well, but there are two icons in my device screen. I think it could be a AndroidManifest problem. Any idea what it could be?
This my AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="pk.aeh.ideos.taa"
android:versionCode="1"
android:versionName="1.0" >
<application
android:icon="#drawable/icon"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar" >
<activity
android:name=".Ghinho_congviecActivity"
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="Nhap_congviecActivity"></activity>
<activity android:name="Sua_congviecActivity"></activity>
<activity
android:name=".Quizzes"
android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".PlayGame" />
<activity android:name=".Result" />
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

This could be because you have declared two activities as MAIN and LAUNCHER
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
in your Androidmanifest.xml file. You need to have only one activity with these intent filters so that when the app is installed the system will know which activity is to be used as the main launcher activity.

It is. You have two of these:
<category android:name="android.intent.category.LAUNCHER" />
Get rid of the one you don't want.

You need to make these changes to your Manifest.xml
<activity
android:name=".Ghinho_congviecActivity"
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="Nhap_congviecActivity"></activity>
<activity android:name="Sua_congviecActivity"></activity>
<activity
android:name=".Quizzes"
android:launchMode="singleTask">
</activity>
I am assuming that the Activity with the attribute android:label="#string/app_name" might be your main activity.

It could be because you have changed your package name and installed it twice with different package names.

Remove the intent filter of one the activity and it would work perfectly.!

Your manifest file should only have one activity with below Intent Filter, Activity which you want to have an icon:
<intent-filter>
<action android:name = "android.intent.action.MAIN" />
<category android:name = "android.intent.category.LAUNCHER" />
</intent-filter>
Based on your description, it sounds like two activities have this line. Check your Manifest...

You can declare only one Intent filter in the activity, on AndroidManifest.
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
If you used two or more intent filter in AndroidManifest, then you will have display 2 app icon, So remove it & set one intent filter.
I hove this is usedful to you.