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LESSON 2.2. INTERFACE (GUI)This lesson will teach you the following concepts...• Choosing the resolution according to the device• Orientation of the window• Management of touchscreenEstimated time: 30 minOverviewThe Android system is available on the phones and on the tablets. WinDev Mobile allows you toeasily create interfaces that adapt to the device used.Choosing the resolution according to the deviceWhen creating a project, you will have to choose the resolution that will be used for the projectwindows. Two cases may occur:• You know the target device: in this case, all you have to do is select it in the list proposed by thewizard.• You do not know the target devices: in this case, you must choose the smallest resolution<strong>com</strong>mon to all these devices. Via the anchoring of controls in the window, the content will beadapted to the resolution.Orientation of the windowIn Android, a window can have one of the following orientations:• Locked in portrait mode• Locked in landscape mode• Free: the window follows the orientation of the device.This orientation is defi ned in the "Details" tab of the description window of the window("Description" from the popup menu of the window).38 Part 2: Android applicationPart 2: Android application 39
No specifi c operation must be performed in the two fi rst cases.For a free window, the organization of the controls and their size must adapt to the orientation.The anchoring mechanism must be use to get a proper result.Practical exampleOpen (if necessary) the "My_Android_Project" project that was created in the previous lesson.AnswersA corrected project is available. This project contains the different windowscreated in this lesson. To open the corrected project, on the "Home" pane, in the"Online help" group, expand "Tutorial" and select "My Android project (Answer)".To center the button in the window:1. Select the button (click the button).2. On the "Alignment" pane, in the “Centering and distribution” group, click "Center in theparent (horz)".In order for the button to remain centered in the window, we are going to use the controlanchoring:1. Select the button (click the button).2. Display the popup menu (right mouse click).3. Select "Anchor": the window for defi ning the anchors is displayed:In our example, the project was created for a phone and its test was run in portrait mode in thesimulator.We are now going to run its test in landscape mode in the simulator.Run the test of the project ( among the quick access buttons).1. The window is displayed in portrait mode.2. In the simulator, click the arrow in the shell ( ).3. The orientation of the window changes on the screen.4. In our example, the location of the button does not change: it does not adapt to theorientation of the screen.4. Select "Horizontally centered" and validate (green button).Run the test of the project ( among the quick access buttons):• The button is centered in portrait mode.• Change the orientation of the simulator.• The button remains centered in landscape mode.We are now going to modify our window in order for the "Display" button to be centered in thewindow and to remain centered regardless of the device orientation.Stop the test and go back to the editor.40 Part 2: Android applicationPart 2: Android application 41
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