android - send data from activity to activity class and between them fragment -

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my app show activity(1) .when press button ,app open fragment .after , fragment send data activity (2) , open activity (2) -that works well- . ,activity(2) edit data , send activity(1) -here problem- .

i have tried many ways doesn't work

when working complex screens multiple fragments , activities, recommend use event-driven library, like:

it's going let transform this:

no eventbus

into this:

with eventbus

check this post detailed explanation use cases of these libraries.


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