Android launch activity on top of particular activity

Question

Say, I have below Activity

Activity A, Activity B, Activity C and Activity D

Currently stack is having below Entry

Activity C
Activity B
Activity A

I have to launch Activity D so that stack become like below,

Activity D
Activity A

What flag I have to set?

Answer 1

Consider using A as a dispatcher. When you want to launch D from C and finish C and B in the process, do this in C:

// Launch A (our dispatcher)
Intent intent = new Intent(this, A.class);
// Setting CLEAR_TOP ensures that all other activities on top of A will be finished
//  and setting SINGLE_TOP ensures that a new instance of A will not
//  be created (the existing instance will be reused and onNewIntent() will be called)
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP);
// Add an extra telling A that it should launch D
intent.putExtra("startD", true);
startActivity(intent);

in A.onNewIntent() do this:

@Override
protected void onNewIntent(Intent intent) {
    if (intent.hasExtra("startD")) {
        // Need to start D from here
        startActivity(new Intent(this, D.class));
    }
}