java - How to attach() and detach() instead of add() and remove() to save fragment view -

i have following code actionbar:

private class mytablistener implements actionbar.tablistener {     private fragment mfragment;     private final activity mactivity;     private final string mfrag;      public mytablistener( activity activity, string fragname )     {         mactivity = activity;         mfrag = fragname;     }      @override     public void ontabreselected( tab tab, fragmenttransaction ft )     {         // todo auto-generated method stub      }      @override     public void ontabselected( tab tab, fragmenttransaction ft )     {         mfragment = fragment.instantiate( mactivity, mfrag );         ft.add( android.r.id.content, mfragment );     }      @override     public void ontabunselected( tab tab, fragmenttransaction ft )     {         ft.remove( mfragment );         mfragment = null;     } } 

i have textboxes within tab fragments , switching between tabs forces app lose data added textbox. instead of add , remove, use attach , detach saves fragment state.

how accomplish within code have?

update:

the code looks this:

private class mytablistener implements actionbar.tablistener {     private fragment mfragment;     private final activity mactivity;     private final string mfrag;      public mytablistener( activity activity, string fragname )     {         mactivity = activity;         mfrag = fragname;     }      @override     public void ontabreselected( tab tab, fragmenttransaction ft )     {         // todo auto-generated method stub      }      @override     public void ontabselected( tab tab, fragmenttransaction ft )     {         //mfragment = fragment.instantiate( mactivity, mfrag );         //ft.add( android.r.id.content, mfragment );           mfragment = mactivity.getsupportfragmentmanager().findfragmentbytag(mfrag);           if( mfragment == null ) {             mfragment = fragment.instantiate(mactivity, mclass.getname());             ft.add(android.r.id.content, mfragment, mfrag);           } else {             ft.attach(mfragment);           }     }      @override     public void ontabunselected( tab tab, fragmenttransaction ft )     {         //ft.remove( mfragment );         //mfragment = null;           if (mfragment != null) {                 ft.detach(mfragment);                }     } } 

and getting error following line:

mfragment = mactivity.getsupportfragmentmanager().findfragmentbytag(mfrag); 

error:

the method getsupportfragmentmanager() undefined type activity 

instead of rewriting code, use sharedpreferences temporarily store variables being displayed.

in ondestroy method of tab you're leaving, add variables preferences, , retrieve them when re-enter tab.

@override public void ondestroy(){     super.ondestroy();     log.i("ondestroy", "logged");     sharedpreferences prefs = getactivity().getsharedpreferences("name", context.mode_private);      editor editor = prefs.edit();     editor.putstring("stringname", stringtostore);     editor.commit(); }