For security reasons, I want to be able to specify two lock passwords (or patterns) as follows :
One for normal unlocking the device.
Another one if entered, the device will factory reset itself (and maybe format the SD)
I want this to happen from the main Android lock screen, but with two passwords.
I do not know of any application that does what you request. Maybe "After Unlock" has a feature like that.
What I would do is make an Android application that is fired after unlocking the phone. The application would request a new password and if it is entered correctly do the factory reset and format the SD if needed.
Check this project for an example of how this could be done: myLock
Its possible with device admin & setting password policy. Im not sure I can post some sample code here or not as this site not for codes , for ex
mDevicePolicyManager.setMaximumFailedPasswordsForWipe(mCameraAdminReceiver, 2);
Well, personally I don't think that there is any application that can help you in putting the lock over your device when wrong password is entered your device gets factory reset. But yes I have seen that function available over the HTC one M8, if you put the password over the HTC M8 wrong for 5 times it gives you the warning and if you put the password wrong for 10 times then the device automatically factory reset your device. I would say it's not possible to till data but I think if you are hungry for the function like, you can either try creating and application which can do so (but I think that would be whole tough mess) or try getting an HTC one M8.
You might need to root your phone and find a way to add another password. You might need programming knowledge for this.
