Question

I have this need to place my app in the share/send context menu so that the user can pass a file path in (any) file manager apps to my application.
How is this achieved?

Answer 1

The share context menu makes an INTENT with certain contents (type of data etc). You should register your app as being able to handle such an intent with an intent filter. You’ll be automatically included if you choose the right type. You should read up on this:

To inform the system which implicit intents they can handle,
activities, services, and broadcast receivers can have one or more
intent filters. Each filter describes a capability of the component, a
set of intents that the component is willing to receive. It, in
effect, filters in intents of a desired type, while filtering out
unwanted intents — but only unwanted implicit intents (those that
don’t name a target class). An explicit intent is always delivered to
its target, no matter what it contains; the filter is not consulted.
But an implicit intent is delivered to a component only if it can pass
through one of the component’s filters.

Read about it here: http://developer.android.com/guide/topics/intents/intents-filters.html