01 Buttons and TextViews

• Build and Run your app on device

• Build the .apk file

  • Rename the .apk file 

  • PeriodLabNumberLastFirstCustomName.apk  

  • P8L01aTraDanFunApp.apk

• Submit assignment

  • .apk file

  • Classes: MainActivity.java

  • Layouts: activity_main.xml

• Custom ideas and demo

  • Color, font, images, sound

    • Coloring Button: convert to AppCompatButton, then set background color

<Button => androidx.appcompat.widget.AppCompatButton

android:background="#ccddaa"

• • Common Attributes or go to the bottom of the View reference page

  • text to speech?

  • RadioGroup and RadioButton?

  • more widgets??

  • Customize as you desire...

• Submit as Lab01b

  • P8L01bTraDanFunApp.apk

  • Video demonstrating your embellishments

Thread thread = new Thread() {

  @Override

  public void run() {

    try {

      while (!thread.isInterrupted()) {

        Thread.sleep(1000);

        runOnUiThread(new Runnable() {

          @Override

          public void run() {

            // update TextView here!

          }

        });

      }

    } catch (InterruptedException e) {

    }

  }

};

thread.start();

1. Activity: An activity has a single screen, which usually composes of one of more views. An activity interacts with the user to perform one task.

2. Service: Background processes (similar to Windows' service or Unix's daemon), e.g., playing music.

3. Broadcast Receiver: Receives and reacts to system messages, e.g., low battery life.

4. Content Provider: Android defines a content provider mechanism for applications to share data without exposing the underlying implementation. Via content provider, your application can share data with other applications, or use data from another application (e.g., from SQLite Database).