device

问题 i was following the Performance Tips through the developer site. There mentions about android devices that don't have a JIT. But i searched for jit-less devices but could not find a broad list. There are also huge differences between devices with and without a JIT: the best code for a device with a JIT is not always the best code for a device without. or On devices without a JIT, it is true that invoking methods via a variable with an exact type rather than an interface is slightly more

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . I need you help Try: model/user.rb link to source but it does not work 回答1: Simply comment out the line specifying validators for the email attribute, or remove it altogether: # app/models/user.rb # validates

问题 I am using ToDo List in my app.It is working fine in simulator but it gives me error in blackberry Strom 9550 like this : net.rim.device.api.system.ControlledAccessException Plz help me to solve this error. 回答1: Have you checked the app permissions? The simulator gives access to most by default, actual devices do not. I've also ran into a problem in the past where you might get past it by redeploying a couple times (while the app is running), and occasionally had to uninstall and reboot. 来源：

问题 I installed the following environment to start developping android applications. OS: windows 7 64 Java: jdk 1.8.0_77 Eclipse: eclipse-android-neon-2-incubation-win32-x86_64 SDK: android-sdk_r24.4.1-windows (Android 6.0 7.0 e 7.1.1) All was ok until the moment to start AVD. I created various ADV configurations but when starting I received always the same error (it changes only the device_name): The Android emulator process has unexpectedly stopped running. The instance (device_name) is now

问题 So I'm having a lot of difficult with build.phonegap.com workflow. Using Cordova 3.3 and a Droid Razr Maxx. If I build locally, plugins work in emulator. In Phonegap build (on device), the javascript is working well but the plugins are totally borked. I have added the plugin code to my config.xml, but they don't show up in my project on build.phonegap.com. Using remote debugging, I have no navigator.device object, even after manually firing the deviceready callback with success. Therefore no

问题 I am trying to retrieve PID and VID of a connected USB device. Starting with this line of C# code: System.Management.ManagementClass USBClass = new ManagementClass("Win32_USBDevice"); Then I got exception "ManagementException not found" , Later I run into this link: http://msdn.microsoft.com/en-us/library/windows/desktop/aa394084(v=vs.85).aspx It turned out Win32_USBDevice was not on the list at all. Tried Win32_USBController but didn't get what I wanted. Could anyone let me know if there is

问题 I've got a program which requires a 1280x768 32 bit display, but the computer on which it runs is ultimately going to be headless. Why does resolution and depth matter on a headless computer? The program actually identifies and responds to certain changes that take place on the display device, but those changes happen to be immaterial to the user - just the responses matter. Yes, there's a lot wrong. I'll take any way that will make this work ('working' requires that the entire display gets

问题 This question already has answers here : Getting device os version in Android programmatically (5 answers) Closed 4 years ago . In my app, I have an email button that uses an intent to open gmail app. How do I access the Android device version and the device model to include it in the body of the email? 回答1: For the api info you can use below code. int currentapiVersion = android.os.Build.VERSION.SDK_INT; if (currentapiVersion >= android.os.Build.VERSION_CODES.FROYO){ // Do something for

问题 I have a situation where I would like to communicate between 2-4 devices over the 3G network (it should also work over WLAN, but 3G solution is critical). Every device (except one) asks for a GPS-location every ~5 seconds, but when this process is cancelled by the user of that device, one device needs to be informed of this event. I was thinking that one device could act as a server, and the rest as clients that should connect to the server. Is this possible over the 3G network? I've also

问题 I am trying to test an Android application through the Eclipse plugin on a real device. It is a Samsung Infuse 4G. I believe I have followed all steps on the Android page for testing on devices. First of all, I cannot figure out what the Android OS version is because it does not show up in the settings. I can see that the firmware version is 2.2.1, so I assume I am running that version of Android OS as well. Next, when I connect the device to my computer (running Vista, 64 bit), I get