I have an activity A that once the user presses a button it opens activity B.
I do that using:

startActivity(intent)  
finish()  

The user in Activity B has the option to click on an item and navigate to activity C or press the back button.
Problem:
When pressing the back button, I don't go to Activity A but to its parent.
How can I make sure that on back navigation I go to Activity A, while if the user clicks on an item in Activity B they end up in Activity C?

CodePudding user response：

Suppose you have 4 Activities : A , B , C and D.
User goes from A -> B -> C , i.e. from Activity C user goes to B onBackPress and then A.
But if user goes A -> B -> C -> D, here onBackPress user goes to Activity A.

To implement this you can follow this approach

1. Start Activity B from Activity A - without calling finish()
2. Start Activity C from Activity B - without calling finish()

Here you backpress works fine as each Activity is in stack

3. Start Activity D from Activity C - without calling finish() /or call finish() doesn't matter in this case , as user never goes back to Activity C.
4. OnBackpress() of Activity D, override the method (onBackPress()), and start a new Activity A with clear the backstack (intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); )

Or for Activity A you make play with launch modes, Make Activity A SingleTask so when you again start Activity A from Activity D, same instance of Activity A will be called clearing all tasks(activites) at top

CodePudding user response：

Just add

startActivity(intent) 

Don't call Finish() While redirect to Activity B. It will resolve your back navigation problem.

CodePudding user response：

override onBackPressed() method

@Override
    public void onBackPressed() {
        super.onBackPressed();
        //Set your intent
        Intent intent = new Intent(currentAct.class,Activity A);
        startActivity(intent);

    }