Android Phone Dialer with mysql -- 2

1. When My android app open...it should not allow to user use any other app...not even home button or backbutton (Like kids lock) 2. When user exit app...it should as password for exit...or user can restart mobile if password is lost...and can unistall app or ask admin to issue new password..or forgot password.. 3. after app login....there will be list of my clients name (list contacts) where user can click and automatically call will go to selected user 4. try phone dialer dial the number but should not popup over my app....(if not possible) no problem..user should not able to dial another no...(means if he cut the call to change the number..dialer should off) 5. if call is connected...and phone dialer is working from behind..my app should show call connected time (if possible) This is for now i need in my app....after this i will give more point to add more features in app..but when it wil be success.. step 1. Login in app with user+password, 2. showing contact related to user (mysql), 3. exit the app with a common password or user password...