[android-developers] Change background using another activity

I have two activities, A and B. The activity A is the main, and B is the child from A.

I want to change the background of  A using B.

The activity B open a gallery chooser, to get the image i want to set as background.

I'm trying to send the image path using intents, but when i use the data field of onActivityResult, i get a null value and my App crashes.

what shoul i do? any idea?

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