What feature of the Google Play Store allows developers to release pre-production builds to testers?

Which is considered best practice according to Google’s Android Development documentation?

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?

Which widgets help to embed images in activities?

Using a content provider, which operations are able to perform? a) create b) read c) update d) delete

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.