Fragment replacement display for Android development

Generally we get fragmentmanager when we write a program, then we start a transaction, then we make a fragment substitution and commit the transaction.

// 1. Get Fragmentmanger        Fragmentmanager fm = Getsupportfragmentmanager (); //        // 2. Turn on the transaction        Fragmenttransaction transaction = fm.begintransaction (); //        // 3. Replace         transaction.replace (r.id.fl_content, fragment); //        // 4. Commit a transaction        Transaction.commit ();

However, in actual development, this approach leads to frequent creation of fragment, consumes user traffic, and all the following optimizations are proposed:

is to use Add () and hide (), before the fragment hide, and then to display the fragment added in, when to show the previous fragment, direct Show () out on it.

Private voidswitchframent (Fragment from,fragment to) {if(From! =To ) {mcontent=to ; Fragmenttransaction ft=Getsupportfragmentmanager (). BeginTransaction (); //before switching//judged to have not been added            if(!to.isadded ()) {                //To not be added//From Hidden                if(From! =NULL) {ft.hide (from); }                //Add to                if(To! =NULL) {Ft.add (r.id.fl_content,to). commit (); }            }Else{                //To has been added//From Hidden                if(From! =NULL) {ft.hide (from); }                //Show to                if(To! =NULL{ft.show (To). commit (); }            }        }    }

Tip: Remember to determine if the Add () fragment is null.

Fragment replacement display for Android development