Question

I have 3 activity: Activity1, Activity2, Activity3. Activity1 and Activity3 can start Activity2:

startActivity (new Intent(this,Activity2));

How in Activity2 I can check which class start Activity2 ? Is there any way to take information from Intent ? Thanks…

I dont whant to put anything in Intent. I think I dont need that. When I start intent I already saying from what context I do that (new Intent(*this*,Activity2)). And this “this” I want to recognize in Activity2 !!! Is that possible ?

Answer 1

You can pass that information in the “extra” Bundle of your Intent:

In Activity1:

Intent intent = new Intent(this, Activity2.class);
intent.putExtra("caller", "activity1");
startActivity(intent);

In Activity2:

String caller = getIntent().getStringExtra("caller");

There’s also get/put extra methods for other data types like boolean, int, etc.

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As for why you cannot access the Context you supplied when creating the Intent on the other side:

The only thing that Android does with the supplied Context (i.e. your this) is to create a ComponentName from it. That class only keeps the package of the supplied Context and discards anything else.

So you theoretically could put your activities into different packages and then go getIntent().getComponentName().getPackageName() on it at the receiving end — but please don’t. Intent extras is the way to go.