8: Mobile

Question 1

Common sensors

Answer 1

1. Magnetometer
   - measures magnetic field
   - as as a compass
2. Accelerometer
   - measures acceleration
   - change in velocity, position, small movements
3. Gyroscope
   - measure change in orientation, rotational velocity

Question 2

User wants…

Answer 2

more storage
improved charging
powerful OS
increased durability
camera capability

Question 3

Mobile constraints

Answer 3

1. resource-poor
   - limited RAM, disk, small screen size
2. Finite energy source
   - limited battery
3. Mobile Conectivity
   - disconnection, low bandwidth, volatile
4. inherently hazardous
   - location changes often, more likely to be stolen
   - security risk

even though screen size increase, not optimal for reading –> increase in cognitive load
app data stored at client side –> limited storage

Question 4

Mobile content limitations

Answer 4

1. user subjected to disturbance
2. lower attention span
3. intermittent interaction
4. no full concentration
5. location changes often

Question 5

Mobile design guidelines

Answer 5

1. design for simplicity
2. minimise user input
3. minimise verticle scrolling, avoid horizontal scrolling
4. prioritise information on each screen
5. useful error messages/ feedback
6. fast response time
7. relate visual precedence to tasks importance
8. focused(more is not better)
9. navigation should be narrow and shallow
10. keep the most important features
11. unique new features possible due to mobility

Question 6

Navigation Models

Answer 6

different OS, different models
pick 1 and stick to it
different widgets

Question 7

Input methods and gestures

Answer 7

1. mostly thumb(with touchscreen)
2. minimum target size
   - 44-48px for thumbs
3. direct manipulation
   - no keyboard/touchpad
4. limited reach on screen
   - put controls at the bottom
   - avoid too much scrolling
5. reduce typing
6. use correct keyboard for situation
   - standard keyboard
   - number pad

Question 8

Gestures

Answer 8

1. common gestures
   - swipe left/right
   - pinch to zoom
   - rotate
2. newer gestures
   - press and hold(3d touch)
3. invisible
   - gestures are invisible so discovery is an issue
4. 2 hands
   - multi touch gestures require 2 hands

Question 9

Air gestures

Answer 9

Motion sensor by miniature radar for real-time motion tracking

Question 10

Face ID

Answer 10

apply facial recognition

• dot projector provides grid of small infrared dots onto face
• flood illuminator read resulting pattern and generates 3D face map
• infrared camera take infrared picture of user