Save load and encrypt. А few questions from a newbie

[bfox]

Hello! Created his first full game. A few questions.

1. How do I save the game settings to a file so when you end the game and start again, all Save.
2. How to encrypt a file to open it in Explorer, it was impossible to understand that in it, and correct to gain advantage.
3. Is it possible to protect against decompilation apk?

Thank you.

sorry for my English. I am a Russian .=))

[bfox]

Figured out the settings and save. through preferens.

but anyone can help
2. How to encrypt a file to open it in Explorer, it was impossible to understand that in it, and correct to gain advantage.
3. Is it possible to protect against decompilation apk?

[mzechner]

2) i'm afraid i don't understand the question :/
3) you can't keep people from decompiling your apk. but you can obfuscate it via ProGuard.