CSC 349: The Week beginning Jan. 15

• Homework:
  
  Read and summarize the following:
  
  Netflix, Amazon, and major studios sue maker of "free TV" box (Ars technica)
  FBI security expert: Apple are "jerks" about unlocking encrypted phones (Ars technica)
  
  
  In the context of Android programming define the following terms
  • AVD
  • SDK
  • View
  • Activity
  
  
  Combine the above into one Word document.
  
  Due: Jan. 23
  
  
• Tuesday:
  
  Course Syllabus
  
  Android Studio Hello World
  
  Lab: Create the version of Hello World that changes a message when a button is clicked. Make up your own unique message. Paste into Word two screen captures (before and after the button click) of your project running in an AVD. Due: Jan. 23
  
  Other references:
  Creating a Button: Android Programming
  Android Studio 2.2 Constraint Layouts For Beginners
  
  
  
  
• Thursday:
  
  Presentation: Intro to ConstraintLayout
  
  
  
  RestCalc_s18.zip The activity_main.xml and MainActivity.java files for a simple restaurant tip calculator app. Some features to notice
  • using a EditText that takes in a decimal number (below is an attribute in xml layout)
    android:inputType="numberDecimal"
  • getting information out of EditText and into a variable declared as a double (in MainActivity.java) The output of the .getText() method has to be converted to a string and then parsed as a double
    double bill = Double.parseDouble(etBill.getText().toString());
  • adding an event method associated with user typing in an EditText
    etBill.addTextChangedListener(new TextWatcher() {
    which requires three methods
    1. public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    2. public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    3. public void afterTextChanged(Editable editable) {
  
  
  
  
  
  
  
  
  
  
  Lab: Salary Calculation
  Make an app that allows a user to enter two (decimal) numbers, the first an hourly wage and the second a number of hours worked that week. When the user clicks a button, the app should calculate the weekly salary including time-and-a-half for any hours over 40.
  
  30 hours at $10.00 yields 30*10 = $300.00.
  50 hours at $10.00 yields 40*10 + (50-40)*10*1.5 = $550.00
  
  
  • The resulting salary should be displayed with a dollar sign and two decimal places.
  • The result should be cleared out if the user changes either input value.
  • A "toast" should be displayed if the user enters hours greater than 84 saying that the user worked too many hours.
  
  
  Toast.makeText(getApplicationContext(), "Here's to you ", Toast.LENGTH_LONG).show();
  
  Due: Jan. 25