device

问题 I would like to programmatically determine (on the Android platform), if the target device is a phone or a tablet. Is there a way to do this? I tried using Density Metrics to determine the resolution and used resources (images and layouts) accordingly but, it did not turn out well. There are differences when I launch the app on a phone (Droid X) and a tablet (Samsung Galaxy 10.1). Please advise. 回答1: You can use this code private boolean isTabletDevice() { if (android.os.Build.VERSION.SDK_INT

问题 Declared: static char status[128] = "off\0"; and implemented a read function: static ssize_t read_proc(struct file *filep, char __user *buf, size_t len, loff_t *offp) { ssize_t cnt = strlen(status), ret; ret = copy_to_user(buf, status, cnt); *offp += cnt; return cnt; } How do I take into account the offp ? currently it prints endless the status to screen 回答1: Thanks the guys comments here I came up with the following implementation, which I believe is the right way to use offp : static ssize

问题 My program currently gets a list of drives plugged into the computer with File.listRoots() . But, when I plug a camera or an MP3 player into the computer directly (instead of inserting the memory card), it's not listed, nor does it have a drive letter in Windows Explorer. For example, here's the location of my camera: Computer\Canon PowerShot SD750\Removable storage How can I also list cameras/other devices that do not have a drive letter? I assume this will require a JNI library of some sort

问题 below is my Jquery slider range (min-max) code, the drag works fine on desktop computer, but when I test this on iPad, it doesn't work. Can anyone help me with this please? Unfortunately I can't attach image. Below is the diagram of slider range, =====(>)=======(<)===== var maxValue,myRequest,isDown=false,setUrl; setUrl = "/search_type/filter.php"; $( "#slider-range" ).slider({ range: true, min: 0, max: 500, step:25, orientation: "horizontal", values: [ 0,500 ], slide: function( event, ui ) {

问题 I want to scan some device with BLE. I only want to show my device, so for know I get the name of the device and if it is the good one I put it in my list. if (device.getName().contains(DEVICE_NAME)) { mDevices.put(device.hashCode(), device); invalidateOptionsMenu(); } My problem is that if I change the name of my device this check will be false. So I look if it was possible to get some uuid of some services that I add to do the check with something that would not change. And the only way is

问题 i'm trying to determine if the device i'm running on has the capability to send/receive phone calls, email, and SMS. i found that i can use the TelephonyManager to get the devices phone number and on devices without the capability of making calls the phone number is null. that's one problem down. i still haven't found a way to detect email and SMS capability. 回答1: SMS is probably futile without a cell signal, so you can use your same trick for that. As for email (=networking), you can

问题 I am writing a program which monitors through select() on the keyboard and mouse device files. It waits for any write operation (this should happen when there is a keystroke or mouse movement) on those files and as soon as there is a write operation, some jobs are executed. But it's not working. My code is given below. #include<stdio.h> #include<string.h> #include<sys/types.h> #include<sys/stat.h> #include<fcntl.h> #include<linux/input.h> #include<linux/uinput.h> #include<sys/time.h> #include

问题 I would like to do a scan in a LAN network to find devices linked. I'm developping an app in IOS for IPAD How do I do??? 回答1: Because those are mobile devices I will assume you want to find devices on a wireless network. Theoretically, since wifi uses shared medium for communication, you can passively listen for traffic flowing through the network and collect data about client without sending any packets. This is something that is commonly referred to as a promiscuous mode . In practice there

问题 I'm looking for writing virtual camera drivers. Does anybody has idea? Any book that would be helpful or any link. Adding more details: I have developed a device driver which saves the image to disk and the display uses the device driver to display the image. The performance does not seem good. The fns. that I have used are: //to capture GetDesktopWindow() CreateCompatibleBitmap() Save() //to display WM_MOUSEMOVE giving a call to capture and display every time but the display is not

问题 I'm trying to run my app on the device but I'm getting the following error message "Could not inspect application package", the app was successfully running on the device but then it stopped, it still builds successfully. Other apps are running fine. This was the error from the console. Dec 1 14:08:13 Marafeti kernel[0] : lockbot[567] Builtin profile: gputoolsd (sandbox) Dec 1 14:08:28 Marafeti installd[31] : 0x2ff7c000 handle_install: Install of "/var/mobile/Media/PublicStaging/demoMus.app"