App Inventor 2 by David Wolber, Hal Abelson, Ellen Spertus, Liz Looney

By David Wolber, Hal Abelson, Ellen Spertus, Liz Looney

Yes, you could create your personal apps for Android devices—and it’s effortless to do. This striking e-book introduces you to App Inventor 2, a robust visible instrument that we could an individual construct apps. examine App Inventor fundamentals hands-on with step by step directions for development greater than a dozen enjoyable tasks, together with a textual content answering computing device app, a quiz app, and an app for locating your parked car!

The moment half the publication positive factors an Inventor’s handbook that will help you comprehend the basics of app construction and computing device technology. App Inventor 2 makes a superb textbook for novices and skilled builders alike.

  • Use programming blocks to construct apps—like engaged on a puzzle
  • Create customized multi-media quizzes and examine guides
  • Design video games and different apps with 2nd photos and animation
  • Make a customized journey of your urban, tuition, or workplace
  • Control a LEGO® MINDSTORMS® NXT robotic along with your phone
  • Build location-aware apps by means of operating along with your phone’s sensors
  • Explore apps that contain info from the Web

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Additional info for App Inventor 2

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Some commands need extra information to make them work. An example is Vibrate, which needs to know how many milliseconds to vibrate for. These values are called arguments or parameters. • Numbers are represented as number blocks. You can plug these into commands that take numbers as arguments. • App Inventor has sensor components. The AccelerometerSensor can detect when the device is moved or shaken. • You can package the apps you build and download them to the phone, where they run independently of App Inventor.

2. Click event handler. 3. AfterPicture event handler into the workspace. 4. AfterPicture event handler. 5. AfterPicture has an argument named image, which is the picture that was just taken. BackgroundImage. The blocks should look like Figure 2-15. 32 Chapter 2: PaintPot Figure 2-15. When the picture is taken, it’s set as the background image for DrawingCanvas Test your app Try out this behavior by clicking Take Picture on your device and taking a picture. The image of the cat should change to the picture you just took, and then you can draw on that picture.

Table 3-1 shows all of the components you’ll be using. Designing the Components 39 Table 3-1. The complete list of components for MoleMash Component type Palette group What you’ll name it Purpose Canvas Drawing and Animation Canvas1 The container for ImageSprite. ImageSprite Drawing and Animation Mole The user will try to touch this. Button User Interface ResetButton The user will press this to reset the score. Clock User Interface Clock1 Control the mole’s movement. Sound Media Sound1 Vibrate when the mole is touched.

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