1) the android wallet have the same staking ability as the windos wallet
when you have coins in the wallet it will auto-mine coin to your wallet, the amount you can mine is a fix 12% yr
that why it say on the Op : PoS Yearly Interest: 12% Yearly Interest

2) what do you mean by :why the dev need to read our : pics, folder  
you mean when install the wallet on your phone it tells you that is reading your pics ?

Where did you see or hear that "the dev need to read our : pics, folder when I want Install the Wallet"
If it was on your phone can you post any screen-shoot you have of the incident, so we can see

note : it just a wallet... My wallet works fine..