Use of Context to start another Activity

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Yes its different for different cases,

It depends on the scope. Suppose if you are creating a method in a global class that extends Application to create a Toast that is used in every class of your Application you can use getApplicationContext() to create it.

If you want to create a view that is restricted to that particular Activity you can use Activity.this

Also if you want to create an AlertDialog in some inner class say AsyncTask, then you have to use Activity.this, because the AlertDialog is to be linked to Activity itself.

Also don’t use getBaseContext() just use the Context that you are having. For getting further information for the same you can see this Answer.

So, the answer to the real question is better to use Activity.this to start a new Activity. 

Intent intent = new Intent(Current_Activity.this, Calling.class);
startActivity(intent);

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