Finish all previous activities

I guess I am late but there is simple and short answer. There is a finishAffinity() method in Activity that will finish the current activity and all parent activities, but it works only in Android 4.1 or higher.

For API 16+, use

finishAffinity();

For below 16, use

ActivityCompat.finishAffinity(YourActivity.this);

Hope it helps!

In my case I use finishAffinity() function in last activity like:

finishAffinity()
startHomeActivity()

Hope it'll be useful.

For logout button on last screen of app, use this code on logout button listener to finish all open previous activities, and your problem is solved.

{
Intent intent = new Intent(this, loginScreen.class);
ntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}

instead of using finish() just use finishAffinity();

When user click on the logout button then write the following code:

Intent intent = new Intent(this, LoginActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);

And also when after login if you call new activity do not use finish();

I guess I am late but there is simple and short answer. There is a finishAffinity() method in Activity that will finish the current activity and all parent activities, but it works only in Android 4.1 or higher.

For API 16+, use

finishAffinity();

For below 16, use

ActivityCompat.finishAffinity(YourActivity.this);

Hope it helps!

shareedit answered May 27 '18 at 8:03

Akshay Taru

Best way to close all the previous activities and clear the memory

finishAffinity()
System.exit(0);

I have tried the flags on my end and still haven't worked. I have an application with a very similar design and I have a possible solution in terms of logic. I have built my Login and Logout using shared preferences.

If I logout, data in my shared preferences is destroyed/deleted.

From any of my activities such as Home.java I check whether shared preferences has data and in this case it won't because I destroyed it when I logged out from one of the screens. Therefore logic destroys/finishes that activity and takes me back to the Login activity. You can replicate this logic in all your other activities.

However remember to perform this check inside onPostResume() because this is what is called when you go back to Home.java

Code Sample Below:

@Override
protected void onPostResume() {
    SharedPreferences pref = this.getSharedPreferences("user_details", Context.MODE_PRIVATE);
    if (pref.getAll().isEmpty()){
        //Shared Preferences has no data.
        //The data has been deleted
        Intent intent = new Intent(getApplicationContext(), Login.class);
        startActivity(intent);
        finish();
        //Finish destroys that activity which in our case is the Home.java
    }


    super.onPostResume();
}

In Kotlin this way:

in Another Activity (with some classes), under Imports

var activity:Activity?=null
    get() = field
    set(value) {
        field = value
    }

Then, under onCreate

activity=this

in MainActivity now:

activity?.finish()