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

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

Yes, you could create your individual apps for Android devices—and it’s effortless to do. This remarkable e-book introduces you to App Inventor 2, a robust visible software that shall we someone 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 laptop app, a quiz app, and an app for locating your parked car!

The moment 1/2 the booklet gains an Inventor’s guide that will help you comprehend the basics of app development and computing device technological know-how. App Inventor 2 makes a very good 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 photographs and animation
  • Make a customized journey of your urban, university, or workplace
  • Control a LEGO® MINDSTORMS® NXT robotic together with your phone
  • Build location-aware apps through operating together with your phone’s sensors
  • Explore apps that include info from the Web

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From the User Interface drawer, drag in a Button component, placing it beneath Canvas1. Rename it “ResetButton” and set its Text property to “Reset”. 4. Also from the User Interface drawer, drag in a Clock component. It will appear at the bottom of the Viewer in the “Non-visible components” section.

A Canvas component, which is the drawing surface. png file from the HelloPurr tutorial in Chapter 1. Later in this chapter, you’ll modify the app so that the background can be set to a picture the user takes. Creating the Color Buttons First, create the three color buttons by following these instructions: 1. Drag a Button component onto the Viewer, change its Text attribute to “Red”, and then make its BackgroundColor red. 2. In the Viewer, in the components list, click Button1 to highlight it (it might already be highlighted) and click Rename to change its name from Button1 to RedButton.

2. Open the DrawingCanvas drawer. Click. 3. PaintColor to block. 4. Repeat steps 2–4 for the blue and green buttons. 5. The final button to set up is WipeButton. Click from the WipeButton drawer. Click block. 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.

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