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Examples of Android Apps in Java

Demos of Android apps for my Android App Development course. Apps were written in Java using Android Studio.

Note: All these apps are in one repository, so you will need to download or clone the whole repository even if you only want code for one app.

Directory

  • RockPaperScissors-SingleActivity

    • A game with one activity and:
      • a ConstraintLayout
      • putting logic code in a separate class
      • setting an onClick handler using an XML widget attribute

  • RockPaperScissors-SingleActivity-Menu+Settings

    • A game with one activity and:
      • a menu in the app bar
      • a settings activity and xml layout with a CheckBoxPreference

  • RockPaperScissors-SingleActivity-MultiLayout

    • A game with a single activity and:
      • layouts for both screen orientations:
        • portrait
        • landscape
      • Activity state is saved in a Bundle using the onSaveInstanceState callback method.

  • Multi-ActivityDemo

  • A very simple app that demonstrates starting a second activity

  • RockPaperScissors-MultiActivity

    • An RPS game with two activities
      • Uses radio buttons for player's hand choice
      • The second activity has an app bar with an up button
      • The player's hand choice is sent to the second activity in an intent

  • SimpleFragmentDemo

    • A simple app that has two activities and two fragments.
      • In portrait orientation each fragment is loaded into a separate activity.
      • In landscape orientation both fragments are loaded in one activity.
    • The state of the first activity is saved during rotation, the second activity has configuration change disabled.
    • When a button on the first fragment is clicked, a message is sent to the second fragment.

  • RockPaperScssors-Fragments

    • A game with two activities and two fragments which are loaded differently depending on screen size and orientation. Activities have a Toolbar and the second activity has an up button on the Toolbar.

  • AsyncDemo

  • A simple demo of running a task on a non-UI thread using AsyncTask.

  • DatePickerDemo

  • A simple app with just a DatePicker widget and a TextView that shows the date selected. The Calendar class is used to get the current date and the SimpleDateFormat class is used to format the date obtained from the picker.

  • SimpleListViewDemo

    • One Activity with a ListView in its UI
    • An ArrayIndex of HashMap objects with contact info
    • A SimpleAdapter
    • An item click handler

  • SimpleRecyclerViewDemo

    • One Activity with a RecyclerView in its UI
    • An ArrayIndex of HashMap objects with contact info
    • A RecyclerView Adapter
    • A View click handler

  • ListViewArrayAdapterParserDemo This is a Spanish-English vocabulary practice app.

    • One ListActivity.
    • An XML file in the Assets folder containing Spanish-Entlish vocabulary.
    • A SAX Parser that produces an ArrayList of vocabulary objects.
    • An ArrayAdapter
    • An item click handler

  • WeatherForecast-SAX+ListView

    • Parses an XML file of weather data using SAX
    • Displays weather icons in the ListView along with the weather data.
    • The data is from Open Weather Map.

  • WeatherForecast-SAX+SQLite+ListView

    • Uses a database to store multiple weather forecasts in an SQLite database.
    • Uses a SimpleCursorAdapter with the ListView.
    • Data is in the form of XML files downloaded from CDYNE Weather

  • WeatherForecast-SAX+SQLite+REST+ListView

    This app is no longer working. Weather Underground no longer provides a Web API

    • Pulls forecast data from the Weather Underground REST service

  • Parse the XML forecast data using SAX

    • Stores the forecasts in a SQLite database
    • Uses a CursorAdapter to display a forecast in a ListView.

  • WeatherForecast-kSOAP+SQLite+ListView

  • Similar to WeatherForecast-SAX+SQLite+ListView, but it gets it's weather forecast data from a SOAP web service instead of from XML files. It uses kSOAP as the web service client. 7/12/16: Unfortunately, the cdyne weather web service used by this app is defunct!

  • kSoapWaterTempDemo

    • A very simple app that demonstrates using the kSoap2-Android library to read from a web service. It reads the ocean temperature from a NOAA SOAP web service.

  • GeoDistanceCalcuator

    • Uses the Fused Location Provider (Google Play Services) to get the current latitude and longitude.
    • Use an Android Geocoder object to convert latitude and longitude to an address and vice-versa.
    • Uses Android Location objects to calculate the distance between the two locations.

Read about Android programming on my blog: https://birdsbits.wordpress.com/tag/android/