David Wolber, Hal Abelson, Ellen Spertus, Liz Looney's App Inventor 2 PDF

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

ISBN-10: 1491906847

ISBN-13: 9781491906842

Yes, you could create your individual apps for Android devices—and it’s effortless to do. This awesome ebook introduces you to App Inventor 2, a strong visible device that shall we somebody construct apps. research App Inventor fundamentals hands-on with step by step directions for development greater than a dozen enjoyable tasks, together with a textual content answering desktop app, a quiz app, and an app for locating your parked car!

The moment half the publication positive factors an Inventor’s guide that can assist you comprehend the basics of app development and computing device technological know-how. App Inventor 2 makes an exceptional textbook for rookies and skilled builders alike.

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

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BackgroundImage to the image that the user just shot. 1. Click event handler into the workspace. 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.

Confirm that your blocks appear as they do in Figure 2-14. Adding Behaviors to the Components 31 Figure 2-14. Clicking the color buttons changes the DrawingCanvas’s PaintColor; clicking Wipe clears the screen Test your app Try out the behaviors by clicking each of the color buttons and seeing if you can draw different colored circles. Then, click the Wipe button to see if the canvas is cleared. Letting the User Take a Picture App Inventor apps can interact with the powerful features of an Android device, including the camera.

DrawCircle event are open sockets for you to specify where the circle should be drawn. DrawCircle. Note You can access the event parameter values by mousing over them in the when block, as shown in Figure 2-8. Figure 2-8. Mouse over an event parameter to drag out a get block for obtaining the value 3. DrawCircle block, as shown in Figure 2-9. Figure 2-9. The app now knows where to draw (x,y), but we still need to specify how big the circle should be 4. Now, you’ll need to specify the radius, r, of the circle to draw.

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

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