This repository contains the code for assignments and labs from my Android course:

####hw1-Eight-Queens 8-Queens Puzzle Game: https://github.com/danuzclaudes/android-course/tree/master/hw1-Eight-Queens/java/edu/unc/chongrui/assignment1/MainActivity.java

1. place 8 chess queens on an 8 x 8 chess board so that no two queens threaten each other

2. detects and reports wrong moves;

3. If the person gives up in the middle of the game, the program automatically finishes the puzzle, from where the person left the game;

4. Extra: show total number of valid solutions when the “give up” button is pressed and an option to choose which solution we want to see.

####lab2 Building Apps: Layouts, Buttons, Images, and Event Handling.

####hw2-RealTime-SensorPlotter

• https://github.com/danuzclaudes/android-course/tree/master/hw2-RealTime-SensorPlotter/java/edu/unc/chongrui/assignment2

• Plot sensor values, their mean, and their variance over time.

• First Activity: https://github.com/danuzclaudes/android-course/tree/master/hw2-RealTime-SensorPlotter/java/edu/unc/chongrui/assignment2/viewer/DashboardActivity.java

  • The user will be able to choose two types of sensors: Accelerometer & Proximity
  • Display the status of sensors: whether present or not, max range, resolution, min delay
  • When a user selects a sensor, the user will be taken to next activity

• Second Activity: https://github.com/danuzclaudes/android-course/blob/master/hw2-RealTime-SensorPlotter/java/edu/unc/chongrui/assignment2/viewer/DataPlottingActivity.java

  • The second activity presents the following on same graph: 10 sensor values, a running mean of the last 10 values, a running standard deviation of last 10 values
  • A deque is used to have at most 10 ChartData objects, wrapping sensor value, mean and stddev
  • Every time a new sensor data arrives, the ChartData object will be created and current mean/stddev inside the queue will be updated by it. When onDraw() is invoked, it will traverse the queue and plot each object.
  • The one-pass algorithm for running mean and std-dev: http://introcs.cs.princeton.edu/java/97data/OnePass.java.html

• Object-Oriented Design Patterns

  • model.SensorData: Parent class for all types of sensor data
    • A SensorData object would wrap timestamp of event, type of sensor, and the sensor value.
    • For Environmental Sensors, there would be only one sensor value as event.values[0].
    • For Motion Sensors, the values would be computed as Sqrt(x*2 + y*2 + z*2) from raw values on three dimensions.
  • model.SensorDataFactory: Apply Factory Design Pattern to create SensorData objects by sensor types.

• Structure of the Model

  model.SensorData --- model.SensorDataFactory (a factory which creates SensorData object by sensor type)
  / | \
  model.AccelerometerData
  model.LightData
  model.ProximityData
  

• Structure of the Viewer

  viewer.SensorParentActivity (abstract; registers SensorManager and Sensors; )
  /                         \
  viewer.DashboardActivity, viewer.DataPlottingActivity (implements onSensorChanged)
                              |
                              CustomChartView (invoked by Intent, plot each point)
  
  

####hw3-GoogleLocationService-MediaPlayer

• https://github.com/danuzclaudes/android-course/tree/master/hw3-GoogleLocationService-MediaPlayer/java/edu/unc/chongrui/assignment3
• Display specific songs at given locations
• Set up Google Maps API key
  • TODO: Before you run your application, you need a Google Maps API key.
    • Follow the directions here: https://developers.google.com/maps/documentation/android/start#get-key
  • TODO: Generate the page google_maps_api.xml automatically by creating the project using Google Maps Activity
  • Once you have your key (it starts with "AIza"), replace the "google_maps_key" string in the file. Your Public Key Here TODO: Before you run your application, you need a Google Maps API key.

####hw4-BeanTimerReader-Analytics

• https://github.com/danuzclaudes/android-course/tree/master/hw4-BeanTimerReader-Analytics/java/edu/unc/chongrui/assignment4
• Reads in Bean data thru a timer
• Plots the temporal trends as wearables attached on different parts of body and collected thru different actions