android - Restart activity as e.g. orientation change does -

i want app support different layouts right-handed , left-handed users. after changing respective preference want restart activity in same way restarts when e.g. orientation changes.

what tried far:

1.

intent intent = getintent(); finish(); startactivity(intent); 

this not store , load saved instance state

2.

view cv = findviewbyid(android.r.id.content);  sparsearray<parcelable> state = new sparsearray<parcelable>(); cv.savehierarchystate(state); setcontentview(desiredcv);  cv = findviewbyid(android.r.id.content); cv.restorehierarchystate(state); 

even many things aren't should be.

i think in end figure out how change layout without restarting easier in same way system-defined configuration changes.

you use fragments , programmatically. following same way rearrange dinamically elements in ui think complicated maintain.

onsaveinstancestate() not called on activity being finish-ed. , i'm not aware of way let android handle you.

the solution may create 2 different layout files. programmatically select right 1 in oncreate() method based on preference value has been updated.

if 2 layouts use same ids views need restore, can implement 2 methods save these states in bundle , retrieve these states bundle. when want change layout, start new activity proper intent (telling activity layout load); in bundle associated intent save need , retrieve in oncreate() update views. don't need duplicate code in case use layout dx or sx; can use same code since 2 layouts use same ids.

in way still have 1 activity , can reuse code. , same code use restore state between layout changes can still used onsaveinstancestate() , onrestoreinstancestate(), since, again, ids same.

to make short, use bundles.