How to set my default download location on a External SD card?

I have a Samsung galaxy s3 LTE, and i dont have enough space to download apps (or movies). I have a 16GB micro SD card. Is there a way to make it so apps that download things automatically download it to SD card? The apps im specifically looking for is: Google Play, Aptoide, and Show Box.
My phone is rooted so if there are apps that require root, i can download them.
I know you can move apps to SD card after installing them to the internal memory. But i need something that will install it directly to the external memory, or else i wont have space for apps and movies.
Thanks:)

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