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Yes. Customize Keyboard application ( IME :Input Method Editor ) in Android is an application without any activity subclass .
It's not possible to have a Service on its own as a stand-alone "app". It needs to be started manually by a user through an Activity .
Explanation. Generally, every activity is having its UI(Layout). But if a developer wants to create an activity without UI, he can do it.
I've an application which aims to run only as a service (no interface, just run in background). I have no activity mentioned in my AndroidManifest.xml but put a receiver to start the application at phone start.
<application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <service android:enabled="true" android:name=".MyAppService"> <intent-filter> <action android:name = "me.myapp.MyAppService"> </action> </intent-filter> </service> <receiver android:enabled="true" android:name=".BootReceiver"> <intent-filter> <action android:name = "android.intent.action.BOOT_COMPLETED"/> </intent-filter> </receiver> </application> The problem is that as I'm developing (using Eclipse) the application, I need to test my changes often. When I run the application (with my phone connected in debug mode), I've got a message like
[2011-12-14 00:18:40 - MyApp] Android Launch! [2011-12-14 00:18:40 - MyApp] adb is running normally. [2011-12-14 00:18:40 - MyApp] No Launcher activity found! [2011-12-14 00:18:40 - MyApp] The launch will only sync the application package on the device! [2011-12-14 00:18:40 - MyApp] Performing sync How can I start the application at run, without having to restart it every time ?
Edit this is not possible anymore for Android 3.1 or above. Source
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