device | 易学教程

Network Device Discovery

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For my Android app, users need to connect to a server that will be hosted somewhere on the same LAN. There can be multiple servers hosted on the same LAN. To make it easy for the user, I was going to scan the current LAN that the Android device is connected to and then list all of the network devices that have the server running on it, rather than having the user input the IP to the computer manually. I'm fairly new to networking, and after some searching I found out that I would have to use a multi-cast DNS search or UDP broadcast to detect the other devices. I also found a nice library

Android Logcat not showing logs when I switch devices

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I am trying to use Logcat to help diagnose my android issues. I frequently have a phone plugged in AND an emulator running. Sometimes I debug on the emulator, sometimes I debug on the phone, or maybe even a third device. Logcat does not continue to show messages after a device is switched. How can I specify what Logcat does or force it to resume logging without restarting eclipse? Insight appreciated I've noticed this at times. Usually one of two things does the trick. First, open the Devices view, verify that the new device is showing, and then switch back to Logcat. That seems to kick Logcat

Ruby on Rails functional test with Devise authentication

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问题 I'm searching for a solution for a weird problem. I have a controller, that needs authentication (with the devise gem). I added the Devise TestHelpers but i can't get it working. require 'test_helper' class KeysControllerTest < ActionController::TestCase include Devise::TestHelpers fixtures :keys def setup @user = User.create!( :email => 'testuser@demomailtest.com', :password => 'MyTestingPassword', :password_confirmation => 'MyTestingPassword' ) sign_in @user @key = keys(:one) end test

Cordova does not actually install app on android device

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I've setup cordova 5.0.0 + android SDK API 22 ( Android 5.1.1 ) on ubuntu 12.04 to develop an app. When I run the command cordova run --device it builds without errors the APK and shows Total time: 3.177 secs Built the following apk(s): /var/www/tmp/test-app/platforms/android/build/outputs/apk/android-release-unsigned.apk Using apk: /var/www/tmp/test-app/platforms/android/build/outputs/apk/android-release-unsigned.apk Installing app on device... Launching application... LAUNCH SUCCESS which however does NOT actually installs the APK to the device. I have tried to install the ready built APK

What is the difference between a Mobile and a Desktop device?

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Using Chrome Browser DevTools I wanted to add a custom device in the Emulated devices tab . You can choose several options such as the width and height. And also choose between: Mobile Mobile (no touch) Desktop Desktop (touch) So the difference between Mobile and Desktop doesn't seem to be the touch events . Is a device of 1000*1000px screen size Mobile (no touch) and a device of 1000*1000px screen size Desktop the same? Or a device of 1000*1000px screen size Mobile and a device of 1000*1000px screen size Desktop (touch) the same? So my question is: What is the difference between Desktop and

Constantly getting …DeviceMonitor] Failed to start monitoring

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问题 I find that after running or debugging my application a few times using eclipse, that I get the above output in my console (in red) and I get no feedback from Dalvik as to the connection status to my phone is going. My application will still debug etc. I just get nothing useful in my Console. Any ideas how to fix this? It appears intermittent. It starts doing it after a few minutes, continues to do it for quite a while and occasionally goes away again. This has happened on my last laptop and

Is there a compilation of device-specific bugs for Android devices?

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We've found a crash on a particular device that happens inside some of the standard Java libraries. This crash only happens on one particular model of device. I'm sure there are other curious oddities for various Android devices. Is there a compilation of known issues for Android devices someplace? I'm thinking in particular about oddities in the supplied libraries and JVM type stuff. I am not aware if there is a indexed compilation available on the internet. At the moment, the best place to report/search device-specific bugs is probably still via Android Issues Tracker , of cause, as long as

how to manage debug and release version on android device?

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问题 I'm new to Android dev and I'm almost ready to release a first version of my app :) While testing the signed release apk on my phone, it refuse to install because the debug version is installed with the debug signature. So I have to uninstall the debug version but it delete all my database (and it will do it to my friends who are testing it). Is there a way to manage a debug and a release version of the same app without losing data? 回答1: I'm not aware of any easy way to do get around the

How to write Linux driver module call/use another driver module?

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问题 I'm developing a Linux driver loadable module and I have to use another device in my driver.(kind of driver stacked on another driver) How do I call/use another driver in my driver? I think they are both in the kernel so there might be a way that can use another driver directly. 回答1: You will need the EXPORT_SYMBOL (or EXPORT_SYMBOL_GPL ) macro. For example: /* mod1.c */ #include <linux/module.h> #include <linux/kernel.h> #include "mod1.h" .... void mod1_foo(void) { printk(KERN_ALERT "mod1

how to get Device Token using Iphone Application and other info about the device?

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In my iphone application i want Device Token using the APN. How to get that using code ? Alos i want Other information about the Device User,its version and other info. How to get that using Code ? Is it possible to get the device other information using Device Token? what is the format of the Device Token? Please give solution by code or any link or any other way,which would be appreciated. Thanks, Mishal Shah here how you get information about device--- NSString* deviceName= [[UIDevice currentDevice] uniqueIdentifier]; NSString* localizedModel=[[UIDevice currentDevice] localizedModel];