Assistance needed Understanding Android fragment addition during onCreate -

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i need cleaning information doesn't make sense me, use cases if possible.

what understand:

with fragments in android, understand if plan on replacing them need have container view, preferably framelayout, , add initial fragment container during activities oncreate method. there 1 thing continues not make sense me.

what don't understand , need with:

what rules there regarding where/how container view set up, if there any. android developers site makes container view needs it's own xml layout file, doesn't , have seen examples on here framelayouts nested inside of typical layout files, specific uses , need understand rules of setting container up.

there no rules. need viewgroup -- position , size want. when add fragment it, behave if you'd created fragment's view manually, , called yourviewgroup.addview(fragmentview).

framelayout typically used because makes container no real behavior (you give size , position , let fragment fill container).

there's absolutely no need make container view own layout file. in fact, if want fragment take on content view of entire activity, add fragment activity using id android.r.id.content.


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