Is It Possible to Have an Activity Without Ui in Android?

Is it possible to create a Android activity without UI? Yes it is. Android provides a theme for this requirement.

How can I get active activity in Android?

A rather simple solution is to create a singleton manager class, in which you can store a reference to one or more Activities, or anything else you want access to throughout the app. Call UberManager. getInstance(). setMainActivity( activity ); in the main activity’s onCreate.

How do I start a second activity on Android?

Task 2. Create and launch the second activity

1. 2.1 Create the second activity. Click the app folder for your project and choose File > New > Activity > Empty Activity. …
2. 2.2 Modify the Android manifest. Open manifests/AndroidManifest. …
3. 2.3 Define the layout for the second activity. …
4. 2.4 Add an intent to the main activity.