android - After replacing Fragment, Activity still detects Fragment is visible -

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i have 1 activity hosts many fragments. in fragment a, adding dialog when user presses button ask if sure if want leave fragment. added code in activity's onbackpressed control this:

@override public void onbackpressed() {     fragmenta fragmenta = (fragmenta) getsupportfragmentmanager().findfragmentbytag("fragmenta");      if (fragmenta != null && fragmenta.isvisible()) {         fragmenta.showexitdialog();         return;     }     else { super.onbackpressed(); } }

and dialog works in fragment a, when leaves fragment , goes fragment b (same activity) code:

getactivity().getsupportfragmentmanager().begintransaction().replace(r.id.container,                  fragmentb.newinstance(), "fragmentb").commit();

and press button in fragment b, shows same exit dialog again.

thus, code, saying fragmenta not null , still visible after did replace function.

why fragment still visible when replaced fragment b?


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