By David Wolber, Hal Abelson, Ellen Spertus, Liz Looney
Convinced, you could create your personal apps for Android units - and it is simple to do. This remarkable publication introduces you to App Inventor 2, a strong visible device that shall we someone construct apps. examine App Inventor fundamentals hands-on with step by step directions for construction greater than a dozen enjoyable initiatives, together with a textual content answering desktop app, a quiz app, and an app for locating your parked vehicle! the second one half the publication good points an Inventor's guide that will help you comprehend the basics of app construction and laptop technological know-how. App Inventor 2 makes a good textbook for newcomers and skilled builders alike.
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Extra resources for App Inventor 2, 2nd Edition
Figure 2-10. When the user touches the DrawingCanvas, a circle of radius 5 is drawn at the location of the touch (x,y) Test your app Try out what you have so far on the device. When you touch the DrawingCanvas, your finger should leave a dot at each place you touch. PaintColor property to red in the Component Designer (otherwise, it’s black, as that’s the default). Adding the Drag Event That Draws a Line Next, you’ll add the drag event handler. Here’s the difference between a touch and a drag: • A touch is when you place your finger on the DrawingCanvas and then lift it without moving it.
For this app, initialize the dotSize to 2 by creating a number 2 block (use the typeblocking feature: type a “2” in the Blocks Editor and then press Return) and then plugging it into initialize global dotSize to, as shown in Figure 2-17. Figure 2-17. Touched event handler so that it uses the value of dotSize rather than always using a fixed number. ) 1. Drag out a get block from the initilize global dotsize to block. You should see a get global dotSize block that provides the value of the variable.
When you do, the yellow box in the bottom-left corner will return to 0 because all the sockets are now filled. Touched event handler should look. Note If you type a “5” in the Blocks Editor and press Return, a number block with a “5” in it will appear. This feature is called typeblocking: if you start typing, the Blocks Editor shows a list of blocks whose names match what you are typing; if you type a number, it creates a number block. Figure 2-10. When the user touches the DrawingCanvas, a circle of radius 5 is drawn at the location of the touch (x,y) Test your app Try out what you have so far on the device.
App Inventor 2, 2nd Edition by David Wolber, Hal Abelson, Ellen Spertus, Liz Looney