The default action resultant when pressing the device back button is to pop the backstack. What is the backstack?

What is the purpose of the AppCompat library?

When does ANR occur?

What is a Master Detail pattern?

Where should layouts be defined wherever possible?

What does a strikethrough formatting indicate in Android Studio?

What's the output try {String token = GoogleAuthUtil.getToken(this, email, 'https://www.googleapis.com/auth/devstorage.read_only'); System.out.println(token); } catch (IOException e) { System.out.println('IOException'); } catch (UserRecoverableAuthException e) { System.out.println('UserRecoverableAuthException'); } catch (GoogleAuthException e) { System.out.println('GoogleAuthException'); }

What's the output? SensorManager mgr = (SensorManager) getSystemService(SENSOR_SERVICE); List sensors = mgr.getSensorList(Sensor.TYPE_ALL); for (Sensor sensor : sensors) { System.out.println(''''+sensor.getName()); }

Which are correct with regards to signing applications? a) All applications must be signed. b) No certificate authority is needed. c) When releasing application special debug key that is created by the Android SDK build tools can be used.

Which is NOT a life-cycle methods of an Activity that can be implemented to perform various operations during the lifetime of an Activity?

Which are UI elements that you can use in a window in an Android application?