android - Fragment navigation -

i'm creating app, 1 main activity , fragments. i'm trying control happen on backpress using code on mainactivity:

@override     public void onbackpressed() {                 if (getfragmentmanager().getbackstackentrycount() == 0) {             this.finish();         } else {             getfragmentmanager().popbackstack();         }     } 

the structure of app this: mainativity --> fragment1 --> fragment2 --> fragment2 ... (back press should me fragment1)
when created fragment2 added fragment1 backstack, , when pressing still see fragment2 in background. how can fragment1 , fragment1 show?

i'm not sure how commit fragment. helpful.

while commit:

 // initialize fragment transaction. fragmenttransaction ft = getsupportfragmentmanager().begintransaction();  // record steps transaction.   ft.replace(r.id.home_frame_layout_for_fragments, basefragments[i],       // add transaction backstack tag of first added fragment ft.addtobackstack(basefragments[0].gettagtext());  // commit transaction. ft.commit(); 

while removing:

final fragmentmanager fragmentmanager = getsupportfragmentmanager(); while (fragmentmanager.getbackstackentrycount() != 0) {     fragmentmanager.popbackstackimmediate(); } 

this may works !!!

happy coding !!!!