To hack an Android phone, just type in a really long password
This can happen only because of a design flaw in the security architecture of Android (L).  Unlike iOS and like traditional PCs, the disk encryption key is always in memory when the device is booted and nothing is really protected if you get a device in that state. It's an all-or-nothing proposition. On iOS, there are different encryption keys that are used to protect different classes of information. Specifically, when an iOS device is locked, the operating system loses a key that can decrypt files that are of a certain protection class that are not supposed to be readable when the device is locked. Only by entering the password when unlocking the device (or reloading it from Touch ID memory), that key can be derived again. The effect is, for example, all your mail can be protected and rendered unreadable while the device is locked.With this security architecture, no bug in the password "gatekeeper UI" can lead to you being able to read the protected information if the device gets locked successfully.