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IT 372 -- Examples

Table of Contents for Examples

• TextDisplay  Magic8Ball  FontSizes  InnerClass  TempConverter  BeerAdvisor  SendMessage  ChangeColors  ClickCounter  Stopwatch  StudentEntryForm  StudentsDB1  StudentsDB2  MonthButtons1  MonthButtons2  Drawing1  Drawing2  TouchEvent1  TouristInfo  ShowSuit  DrawStar  DrawRivers  WriteToFile  ReadFromFile  RestaurantLocator  KotlinPerson1  KotlinPerson2  KotlinGreeter  SecretMessage 

TextDisplay Example:

• TextDisplay Example -- Display text message on the screen.

Magic8Ball Example:

• Magic8Ball Example -- Display a random Magic8Ball prediction.

FontSizes Example

• FontSizes Example -- Display TextView widgits with different font sizes and colors.

InnerClass Example

• InnerClass Example -- Compare behavior of ordinary classes with a class that contains an inner class. See how an inner class is used to implement an ActionListener class.

TempConverter Example

• TempConverter Example -- Set up a Button event handler using three different methods:
  
  1. Setting the onClick property in the Button widget,
  2. Defining an explicit OnClickListener derived class,
  3. Defining an anonymous OnClickListener class.
  4. Pass in a lambda function to use as the click listener.

BeerAdvisor Example

• BeerAdvisor Example -- Create an app that inputs the beer color (blond, amber, brown, dark) in a Spinner widgit, then displays four recommended beers for that color.

SendMessage Example

• SendMessage Example -- Create an app with two activities and an intent that starts up the second activity, passing information to it.

ChangeColors Example

• ChangeColors Example -- Use a button with an event handler to cycle through these background colors: LightBlue, LightGreen, LightPink. Set the background as an astronomical nebula image.

ClickCounter Example

• ClickCounter Example -- Implement a click counter app with a text view initialized to "0" and two buttons Click Me and Reset. When the Click Me button is clicked, add one to the text view; when the Reset button is clicked, set the text view back to "0".  When the device is rotated, set the layout to Landscape and restart the app with the correct number of clicks.

StopWatch Example

• StopWatch Example -- Implement a stopwatch with Run, Pause, and Reset buttons. Have the layout rotate from portrait to landscape when the device is rotated. image.

StudentEntryForm Example

• StudentEntryForm Example -- Implement an app with two activities, an entry form, and a confirmation form.

StudentsDb1 Example

• StudentsDb1 Example -- Create an SQLite database, insert one row into it. Then retrieve the row from the database and display the fields in a textview.

StudentsDb2 Example

• StudentsDb2 Example -- Create an app that enters information into an SQLite database and then lets the user scroll through the rows of the database.

MonthButtons1 Example

• MonthButtons1 Example -- Use a ScrollView to display 12 buttons, one for each month.  In addition to the text, display an image on the left side of each the button.  Each button has a stub event handler that shows a toast identifying the button that was clicked.

MonthButtons2 Example

• MonthButtons2 Example -- Use a ScrollView to display 12 buttons, one for each month. However, for this example, add the buttons dynamically in the activity code. Also add the event handlers as anonymous methods in the activity code.

Drawing1 Example

• Drawing1 Example -- Set up a derived class MyView using the base class View. Override the onDraw method to draw in a MyView object.

Drawing2 Example

• Drawing2 Example -- This example is similar to Drawing1. Random circles of various colors are drawn. A Draw Circles button is available to redraw the random circles.

TouchEvent1 Example

• TouchEvent1 Example -- Set up an a touch event handler that records the locations of touch events in a view.

TouristInfo Example

• TouristInfo Example -- Set up a ListView container that displays the names of tourist cities (such as Barcelona, London, Paris). When a city name is clicked start an activity that displays tourist information about that city.

ShowSuit Example

• ShowSuit Example -- Set up radio buttons to select a suit (club, diamond, heard, or spade) image that will be displayed in an ImageView widget when a Show Image button is clicked.

DrawStar Example

• DrawStar Example -- Create a MyView widget that connects the dots to draw a five-pointed star in its onDraw method.

DrawRivers Example

• DrawRivers Example -- Draw the rivers used for Project 4.  Draw the rivers in the onDraw method of the MyView widget using the data in the raw input file rivers.txt.

WriteToFile Example

• WriteToFile Example  -- Write to a file in Internal Storage. Write string in EditText widget to file. Then read from file and display it in a TextView widget.

ReadFrom Example

• ReadFromFile Example -- Create an app that reads from an input file in the res/raw folder.

RestaurantLocator Example

• RestaurantLocator Example -- Create an app that locates restaurants on a map, drawn my onDraw methods, with touch events.

KotlinPerson1 Example

• KotlinPerson1 Example -- Implement and test a Person class with automatically generated properties.

KotlinPerson2 Example

• KotlinPerson2 Example -- Implement and test a Person class with explicit backing fields, getters, and setters.

KotlinGreeter Example

• KotlinGreeter Example -- Input a name in an EditText widget, compose a greeting to the person with that name, and display the greeting in a TextView widget.

SecretMessage Example

• SecretMessage Example -- Implement a SecretMessage app with three pages implemented by fragments. The three pages are (1) Welcome Page: explains what the app will to, (2) Message Page: inputs a message to encrypt, and (3) Encrpytion Page: encrypts the message and displays the encrypted message. This example shows how to manage the fragments and how to pass information from one fragment to another. Implementing pages as fragments is more modern that implementing pages with activities and intents.