Start Activity Using Custom Action

Question

I am looking to start an activity in my app using a custom action. I have found a few answers but everything I try it throws java.lang.RuntimeException saying N

Answer 1

Just add and intent-filter category as Default.

Implicit intent works perfectly and in many cases its better to use a implicit intent with Intent-action to call a service/Activity than using class-name.

Before startActivty() / startService() with proper context you cane use this method 'queryIntentActivities(Intent intent, int flags)' from package manager class.

It helps the ActivityManager (responsible for launching activities) to check whether the Android system is getting any match with you Intent.

If it doesn't it returns a list size 0 or else >0.

By this you can also check if your app is getting the call,and in this case even if your app is not installed / has got some problem, it will not crash but will throw a warning in Log. Users will face no big trouble apart from app not being launched.

(users will never forgive you if tour app crashes).

Hope this will help !!! Happy Coding. :)