Before the 0.16 betas if you backed away quickly when hitting a creeper you would prevent the creeper from.blowing up but now even if you run faster they will always explode.
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The blast radius of creeper should be 7 blocks (according to wiki) but mojang set this as 10 as you can see in the screenshot. This may be the problem.
[media]I think this is strongly related to (if not a dupe of) MCPE-13214.
Confirmed in a creative flat single player world on hard difficulty. Gave myself an iron sword and a stack of creeper eggs then converted to survival. When I spawn a creeper from an egg, get close enough to hit it, then us back to move away, I cannot get far enough to prevent the creeper from exploding.
Tested on Samsung Galaxy S6 (SM-G920W8), Android 6.0.1 MCPE 0.15.90.7