Finishing only certain activities and sending data

Question

I want to finish only certain activities(3. and 4.) and sending data to 2. activity. How can I do that?

Answer 1

You have 2 choices:

1. Use startActivityForResult()

In this case, Activity2 should launch Activity3 using startActivityForResult(). The result will be returned to Activity2 in a call to onActivityResult().

When Activity3 launches Activity4 it should use startActivity() and should set Intent.FLAG_ACTIVITY_FORWARD_RESULT in the Intent and call finish().

When Activity4 is ready to return the data, it should call setResult() with the data and then finish(). This will return the result to Activity2.

2. Use FLAG_ACTIVITY_CLEAR_TOP | FLAG_ACTIVITY_SINGLE_TOP

In this case, Activity2 should launch Activity3 using startActivity().

Activity3 should launch Activity4 using startActivity().

When Activity4 is ready to return the data, it should create an Intent that contains the data (as "extras") and then do the following:

Intent intent = new Intent(this, Activity2.class);
intent.addFlag(Intent.FLAG_ACTIVITY_CLEAR_TOP |
               Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivity(intent);
finish();

This will cause Activity3 and Activity4 to be removed from the task stack onNewIntent() will be called on the existing instance of Activity2. Activity2 should override onNewIntent() and can retrieve the returned data from the "extras" in the argument passed to onNewIntent().

Answer 2

There are two ways of doing this.

1. set noHistory="true" for activity 3 in the manifest or intent flag while launching. In this case when you click back from 4 app will directly go to 2 since 3 is not in the back stack.

2. Using android launch modes. you can put Activity 1,2 and 4 on one stack and activity 3 on a different stack.

Go through this page to understand the launch modes.

https://developer.android.com/guide/components/activities/tasks-and-back-stack