asp.net core qr code reader

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On touch-screen devices, you can use the VirtualKeyboard class to determine whether the keyboard is displaying, and also to force it to hide or show. isSupported() returns a boolean that describes whether the device supports virtual keyboards. If not, the other methods will have no effect. setVisibility() allows you to specify whether the keyboard should display when this application s context has focus. VirtualKeyboard supports the following modes. HIDE: The keyboard should be hidden at the next opportunity. Afterward, it will automatically be shown or hidden as normal. HIDE_FORCE: The keyboard should always be hidden. IGNORE: Keep track of keyboard visibility, but do not automatically show or hide it. RESTORE: Return keyboard to its previously saved state. SHOW: Display the keyboard at the next opportunity. Afterward, it will automatically be shown or hidden as normal. SHOW_FORCE: Always show the keyboard.

I ve covered the phone, e-mail, web browsing, and calendar. Now it s time to cover those remaining apps that are installed automatically on most phones and experimental Google features that could ship with future versions of Android. I ll discuss default Android 2.1 and 2.2 apps such as Search, the YouTube player, Music, the Clock, and the Calculator. I ll also discuss the power control, the News and Weather widget, Goggles, and gesture search. I ll also discuss some of the options included with Android variations like HTC Sense and Motorola BLUR.

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getVisibility() will return the currently set keyboard visibility state. VirtualKeyboard can only be used by BlackBerry CLDC applications. If developing a MIDlet, you have access to VirtualKeyboardControl, which provides similar methods for querying, showing, and hiding the virtual keyboard. You can obtain a VirtualKeyboardControl by creating a BlackBerryCanvas or BlackBerryGameCanvas and retrieving the virtual keyboard from getControl() or getControls().

The complete layout.css file looks like this: body { font-family: "Helvetica","Arial",serif; color: #333; background-color: #ccc; margin: 1em 10%; } h1 { color: #333; background-color: transparent; } a { color: #c60; background-color: transparent; font-weight: bold; text-decoration: none; } ul { padding: 0; } li { float: left; padding: 1em; list-style: none; } #imagegallery { list-style: none; }

If you are developing business or productivity apps that mainly involve text entry, you may be able to ignore the keyboard issue altogether. The native BlackBerry text entry fields are well integrated with keyboard behavior, automatically handling QWERTY or SureType keys, so no extra effort is necessary on your part. However, if you are developing a game or have a highly customized nonBlackBerry user interface, keyboards are much more likely to be an issue. For example, you might control a game by pressing four buttons, but those four buttons might not exist on all devices. You can use the methods described in this section to dynamically query the phone and determine what the keyboard layout is like, and then make an appropriate decision about how to handle incoming key events. Setting up such a system can take some effort, but in the long run it will be much more efficient than creating a new version of your app for every keyboard type. If you support touch-screen devices, carefully consider the user experience. If you write a game that is entirely touch-based, you might want to forcibly hide the keyboard so the full screen is always available for play. If your game supports a high-score name entry, you might want to show the keyboard on that screen while hiding it everywhere else.

One of the simple apps that ships with Android is a calculator, as shown in Figure 13 1. It has large buttons and does well with simple calculations. However, pressing the Menu button and then Advanced panel will bring up more advanced options like parentheses, trigonometry, and square roots. If you need a true scientific calculator with graphs, you should download an app. There are a number of free apps capable of extending beyond the basic Calculator app, such as Scientific Calculator by Kreactive Technologies and Arity Calculator by Mihai Preda.

Every device has some sort of CPU, radio, and keyboard. However, only some devices have cameras, and only some have GPS. If your app requires these features, or optionally supports them, you will need to determine whether they are present on the device.

#imagegallery li { display: inline; } #imagegallery li a img { border: 0; } Applying that style sheet will give the image gallery a nice sheen:

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