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Android Development: Build Android App from Scratch

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  • Android Development: Build Android App from Scratch

    Taufan Erfiyanto, ST.

    A one day workshop of Android Development at Phetchaburi Rajabhat University, Thailand. In collaboration with Gunadarma University and Phetchaburi Rajabhat University.

  • Founder of pongodev.com, mobile application developer and the man who responsible to deliver the app with beautiful user interface and insure that it generates many download with marketing strategy.

    About

    [email protected]/taufan20linkedin.com/in/taufan20

  • portfolio

  • Crowdfunding mobile-based application that allows users raise funds for humanity and environmental activities. Donation can be done via smartphone credit and transfer.

    http://donasia.org

  • What do you know about Android?

  • 1 billion Android population.

    Horace dediu

  • 1.43 million apps on Google Play in 2014.

    appFigures

  • 268 billion times downloads and generate revenue $77

    billion in 2017.

    Gartner

  • Available in all devices, smartphone, watch, tv,

    and car.

  • Android Development Tools

  • 1. Java Development Kitdownload: bit.ly/JDKandroid

  • 2. Android Studio and SDK Toolsdownload: bit.ly/AnStudio

  • Creating New Project

  • 1. Select Start a new Android Studio Project on Welcome window.

  • 2. Type application name and company domain.

  • 3. Select Device Type and Minimum SDK.

  • 4. Select Blank Activity in Activity type.

  • 5. Name your first activity and layout file.

  • Understand the Project Structure

  • 1. Android project consist of manifest, java, res, and Gradle directories.

  • 2. Activity works as a page in application. Located in java directory.

  • 3. The first method that will be executed when app run is onCreate().

  • 4. Every activity has layout file as its user interface. located in res/layout directory.

  • 5. To connect layout and activity, setContentView() must be defined.

  • 6. Every activity created must be registered to AndroidManifest.xml.

  • Creating Android Emulator

  • 1. Open AVD Manager via Tools > Android.

  • 2. Select Create Virtual Device button.

  • 3. Select device type and screen resolution.

  • 4. Select Android version.

  • 5. Type emulator name.

  • 6. Select the emulator name and click Launch icon.

  • Running Android Project on Emulator

  • 1. Select Run > Run app.

  • 2. Select Launch emulator and emulator name. Or select Choose a running device if you have

    running emulator.

  • Running Android Project on Android Device

  • 1. On Android device, select Settings > Developer Options. Enable USB Debugging.

    Note: Android 4.2 and newer go to Settings > About phone and tap Build number seven times.

  • 2. Connect Android device to the computer via usb cable.

  • 3. Select Run > Run app.

  • 2. Select Choose a running device and device name.

    Note: some device require a driver from its factory to be installed on the computer.

  • Creating User Interface

  • 1. Open your xml layout file in layout directory.

  • 2. Drag widget on Palette section to device screen on the right side.

  • 3. Configure widget properties via properties window on the right bottom corner of the window.

    Note: important properties are id, layout_width, and layout_height.

  • Manipulating Widget

  • 1. Open activity file that use activity_main.xml layout in java directory.

  • 2. Create objects of the widgets in activity file that you want to manipulate.

  • 3. Connect the objects with widget id in xml layout inside onCreate() method.

  • 4. Add event handling to button object.

  • 5. manipulate your widget when button click inside onClick() method.

  • Creating To Do List App

  • 1. Modify the user interface as seen above. Consist of EditText, Button, and ListView.

  • 2. Create objects of EditText, Button, and ListView in activity file.

  • 3. Connect the objects with widget id in xml layout.

  • 4. Create ArrayAdapter object and ArrayList variable above onCreate() method.

  • 5. Define adapter parameter and set it to list object using setAdapter().

  • 6. Add button event handling to add data to the list.

  • 7. Run the project to see the result.

  • Integrating SQLite Database to Android

    Project

  • 1. Create new directory under app/src/main directory via window explorer. name it as assets.

  • 2. Create database to store data inside assets directory using sqlitebrowser.

    Note: database of to do list app can be download at bit.ly/dbTodo and sqlitebrowser can be download at bit.ly/sqliteAndroid.

  • 3. Create new java file inside app/java/package.name.

  • 4. Name it as DBHelper.Note: Download DBHelper.java file at bit.ly/DBHelper

    and copy the code to your DBHelper.java.

  • 5. Define database path, database name, table name and fields.

    Note: SQLiteOpenHelper is used for creating, opening, and upgrading database. SQLiteDatabase is used for communicating data of database.

  • 6. Create object of DBHelper class and ArrayList variable in Activity file.

  • 7. Connect dbhelper object with it class and call createDataBase() and openDataBase() method.

  • 8. Create displayData() method before closing bracket to display data from database with

    getAllNotes() method.

  • 9. And call displayData() method after openDataBase() method.

  • 10. Call addNote() and displayData() method inside button event handling to add data to

    databse and display them after added.

  • 11. Run the project to see the result.

  • 12. Add new arraylist variable to store note id.

  • 13. Do not forget to clear ids and add ids in displayData() method.

  • 14. Create list event handling to delete note with item on list click.

  • 15. Call removeNote() method to remove data from database and displayData() method to re-

    display data on the list.

  • 16. Run the project again to see the result.

  • What do you need to know next to mastering Android development?

  • FragmentsMaterial Design

    Hardware Integration

    Multiple Screen Support

    Connect to Web Services

  • Joel Spolsky, Stack Exchange

    Nothing works better than just improving your product.

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