Because it's low cost and better than nothing. I'm not defending their approach, I think it's terrible, I'm just saying that the cost of simetrically encryptin

Because it's low cost and better than nothing. I'm not defending their approach, I think it's terrible, I'm just saying that the cost of simetrically encrypting a file with a hard-coded key in Android is too low not to do it...but you should improve it ASAP...