Hit the back button but not kill the activity and let it be in Back Stack (Android)

Question

I have 3 activities A, B and C.

I inflate activity B dynamically on a button click and the user can add as many views as he likes.

The operation is like this:

Answer 1

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

        switch(keyCode)
        {
        case KeyEvent.KEYCODE_BACK:
            //bring back the previous activity do your logic here           
            return false;
        }
    return super.onKeyDown(keyCode, event);
}

You could use this, return false when activity should not be closed. use FLAG_ACTIVITY_REORDER_TO_FRONT to launch the previous activity

Answer 2

Yes,I agree with Nandeesh.

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
            switch(keyCode)
            {
            case KeyEvent.KEYCODE_BACK:
                //bring back the previous activity do your logic here           
                return false; //means you don't want to remove the activity from stack 
            }
        return super.onKeyDown(keyCode, event);  // means u want to remove the last activity from Activity stack.
    }

    so question  is that how u can go to other activity without remove it from stack, 
    you can use  :
                Intent myIntent = new Intent(CurrentClass.this, JumptoActivity.class);
                 startActivity(myIntent);*

example: at the switch case u can use this

if(KeyEvent.KEYCODE_BACK)
{
                Intent myIntent = new Intent(CurrentClass.this, NextActivity.class);
                 startActivity(myIntent);
                return false;
}
else
    return true;       //if you not write this then your  menu and other think will be affected.

Thank you I think this little bit information will be helpful for u.