New PDF release: App Inventor 2, 2nd Edition

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

ISBN-10: 1491906847

ISBN-13: 9781491906842

Definite, you could create your personal apps for Android units - and it is simple to do. This notable ebook introduces you to App Inventor 2, a robust visible instrument that we could a person construct apps. research App Inventor fundamentals hands-on with step by step directions for development greater than a dozen enjoyable initiatives, together with a textual content answering laptop app, a quiz app, and an app for locating your parked vehicle! the second one 1/2 the ebook positive factors an Inventor's handbook that will help you comprehend the basics of app construction and laptop technology. App Inventor 2 makes an outstanding textbook for novices and skilled builders alike.

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Extra info for App Inventor 2, 2nd Edition

Sample text

2. Touched event handler, as shown in Figure 2-7. Figure 2-7. DrawCircle block, you’ll see three sockets for the arguments we need to plug in: x, y, and r. The x and y arguments specify the location where the circle should be drawn, and r determines the radius (or size) of the circle. 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.

2. Connect both your computer and your device to the same WiFi connection. 3. In App Inventor (in the browser), from the top menu, select Connect and then choose AI Companion, as shown in Figure 1-7. Figure 1-7. info Live Testing 9 4. On your device, launch the app you installed, the MIT AI2 Companion, as shown in Figure 1-8. Select “Scan QR Code” and then hold your device up to the QR code on the computer screen to scan it. Figure 1-8. On your device, open the Companion app and click “Scan QR Code” If all goes well, you should see the HelloPurr app running on your device, including all of the components you added.

You can drag this block out and then change the 0 to any number you want. Go ahead and drag out the number block, as shown in Figure 1-14. Figure 1-14. Choosing a number block (0 is the default value) 5. Click the 0 and type the new value, 500, as shown in Figure 1-15. Figure 1-15. info Adding Behaviors to the Components 15 6. Vibrate, as shown in Figure 1-16. Figure 1-16. Plugging the value 500 into the millisecs socket Test your app Try it! Tap the button on the device, and you’ll feel the purr for half a second.

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

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