When App Signing came out, I was concerned for the reasons that I outlined in this letter. However, it was opt-in, and so while I would quietly steer developers away from it, that is all that I did. Now that you are making it mandatory for some apps — and appear have the ability to make it mandatory for all in the future — I think that it is time that we figure out how to minimize the risk to the ~2.5 billion Android device owners.
This blog post outlines recent improvements around how users interact with the lockscreen on Android devices and more generally with authentication. In particular, we focus on two categories of authentication that present both immense potential as well as potentially immense risk if not designed well: biometrics and environmental modalities.
The shallow size of that object plus the shallow size of all the objects that are transitively held in memory by only that object. In other words, it's the amount of memory that will be freed when that object is garbage collected.
This class provides access to the speech recognition service. This service allows access to the speech recognizer. Do not instantiate this class directly, instead, call SpeechRecognizer#createSpeechRecognizer(Context). This class's methods must be invoked only from the main application thread.