I am running Django on my raspberry-pi, and I am using avahi-daemon to access my rpi on raspberrypi.local . On my Django I have made APIs for my android application to access via HTTP protocol. For example one of my http request url is: http://raspberrypi.local/api/getUserNames/
The problem is that android is not accessing this url on my local wifi network, i have confirmed that my android device and rpi are both connected to same wifi network, but still the http://raspberrypi.local is not working on android. While it works fine on my PC & MAC.
I tried to find the solution and went through many Q&A explaining about bonjour, mDNS, jmDNS, android-multicast. But all are either too confusing to implement or doesn't work. Please help me, I'm stuck for a while.
NOTE: on my Rpi the avahi-daemon is broadcasting itself as "_workstation._tcp." service-type
--
My Solution:
http://www.dodgycoder.net/2015/02/setting-up-bonjourzeroconfmdnsnsd.html
Android NSD (Network Service Discovery) solved my problem. I used only Discovery Listener and Resolve Listener to solve my purpose.
I specifically used SERVICE_TYPE = "_workstation._tcp."; in order to search for raspberrypi.local with avahi-daemon
Android NSD (Network Service Discovery) solved my problem. I used only Discovery Listener and Resolve Listener to solve my purpose.
NOTE- You'll have to use SERVICE_TYPE = "_workstation._tcp."; in order to search for raspberrypi.local with avahi-daemon
here's link to the solution - http://www.dodgycoder.net/2015/02/setting-up-bonjourzeroconfmdnsnsd.html
I'm trying to replicate this RaspberryPI example on Android
I created an app for android to advertise a URL using mDNS (jmDNS library), the app works well and I can receive the message on another phone using ZeroConf Browser app
But when I try to receive the same message using Physical Web app nothing happens, the app doesn't find the service.
I believe the problem is in the way I send hostname and txt-records.
This is my code:
serviceInfo = ServiceInfo.create(type,
"www.google.github.io", 80,
"path=/physical-web/");
/*A Key value map that can be advertised with the service*/
serviceInfo.setText(getDeviceDetailsMap());
jmdns.registerService(serviceInfo);
can you help me understand what is wrong?
See these discussions:
https://github.com/openhab/jmdns/issues/25
https://github.com/google/physical-web/issues/414
In short, I think the issue is because the url is in a text record, rather than in the service name, but the Physical Web may change the required format in the future...mdns support is still developing.
I made a webserver on my android device(using Nanohttpd). It's working fine over the port 8080
but I want to make it okay over the port 80,(I want to tape on my browser : http://192.168.x.x instead of http://192.168.x.x:8080/ ) but I'm not able to do it
This is how I call the method that creates the webserver:
httpServer = new NanoHTTPD(80,Environment.getExternalStorageDirectory());
Can someone tell me what service is running by default over the port 80 ?
How can i fix this problem ?
I finally found a way to fix that, for those who have the same problem, here is the solution
I rooted the phone using UnlockRoot
then I installed Port redirector from the play store and I forwarded the traffic from port 80 to port 8080, and now my web server is available from the address: 192.168.x.x
Hope it will help :)
Ports below 1024 are restricted on Unix like systems. You need superuser privileges to bind to these "well-known" ports.
List of these "well-known" ports on wikipedia
Check out line 89 of the server source:
https://github.com/NanoHttpd/nanohttpd/blob/master/core/src/main/java/fi/iki/elonen/NanoHTTPD.java
I don't even see a constructor that type-matches your arguments. That might be part of the problem.
I am very new to Android. Our lan is working in class C IP (192.168.1.x series).
I need to establish socket connection between android emulator(Server) and java eclipse (eclipse-java-juno-SR1) which is acting like a client. As I got a information from "http://developer.android.com" website every Android emulator having 10.0.2.15 (Class A IP) by default. But our LAN is working in Class C.
"PC-1" which is using for Android Emulator is having 192.168.1.50 IP, and
the another one "PC-2" which is using for Eclipse-Java is having 192.168.1.55.
This is the setup which I have.
My work is, When I send a string command (through socket) from Android emulator(runing on PC-1) to Java program(runing on PC-2) then that Java program should send continuous jpg photo to Android emulator through socket.
I tried lot but when I try to work with sockets installed apk application is closing by this error: "Unfortunately, Activity name> is closing"
Please help me out in this...
Thanks in advance :)
Does your Application have the
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
in your Manifest - File ?
You can either insert the above line into the manifest xml,
or you can go to "permissions" add "uses permission" and then add the "Internet" one.
My Emulator has no problems opening a Webview to the internet with this permission,
and I can even access my router in my network through the browser in the emulator, which is on some 192.168... address.
Kind Regards and a Happy New Year,
karlheinz
I'm running a web service on my local machine that runs at localhost:54722.
I want to call the service from an app running in the Android emulator.
I read that using 10.0.2.2 in the app would access localhost, but it doesn't seem to work with the port number as well. It says HttpResponseException: Bad Request.
You can access your host machine with the IP address "10.0.2.2".
This has been designed in this way by the Android team. So your webserver can perfectly run at localhost and from your Android app you can access it via "http://10.0.2.2:<hostport>".
If your emulator must access the internet through a proxy server, you can configure a custom HTTP proxy from the emulator's Extended controls screen. With the emulator open, click More , and then click Settings and Proxy. From here, you can define your own HTTP proxy settings.
Use 10.0.2.2 for default AVD and 10.0.3.2 for Genymotion
Since 10.0.2.2 is not a secure domain for Android you have to allow non-secured domains in your network configuration for API 28+ where non-TLS connections are prevented by default.
You may use my following configurations:
Create a new file in main/res/xml/network_security_config.xml as:
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<domain-config cleartextTrafficPermitted="true">
<domain includeSubdomains="true">localhost</domain>
<domain includeSubdomains="true">10.0.2.2</domain>
</domain-config>
</network-security-config>
And point it in AndroidManifest.xml
<application
......
......
android:networkSecurityConfig="#xml/network_security_config">
I faced the same issue on Visual Studio executing an web app on IIS Express. to fix it you need to go to your project properties then click on Debug Tab and change http://localhost:[YOUR PORT] to http://127.0.0.1:[YOUR PORT] and set the android url to http://10.0.2.2:[YOUR PORT]. it worked for me.
I'm not sure this solution will work for every Android Emulator and every Android SDK version out there but running the following did the trick for me.
adb reverse tcp:54722 tcp:54722
You'll need to have your emulator up an running and then you'll be able to hit localhost:54722 inside the running emulator device successfully.
If you are using IIS Express you may need to bind to all hostnames instead of just `localhost'. Check this fine answer:
https://stackoverflow.com/a/15809698/383761
Tell IIS Express itself to bind to all ip addresses and hostnames. In your .config file (typically %userprofile%\My
Documents\IISExpress\config\applicationhost.config, or
$(solutionDir).vs\config\applicationhost.config for Visual Studio
2015), find your site's binding element, and add
<binding protocol="http" bindingInformation="*:8080:*" />
Make sure to add it as a second binding instead of modifying the existing one or VS will just re-add a new site appended with a (1) Also, you may need to run VS as an administrator.
I solved it with the installation of "Conveyor by Keyoti" in Visual Studio Professional 2015.
Conveyor generate a REMOTE address (your IP) with a port (45455) that enable external request.
Example:
Conveyor allows you test web applications from from external tablets and phones on your network or from Android emulators (without http://10.0.2.2:<hostport>)
The steps are in the following link :
https://marketplace.visualstudio.com/items?itemName=vs-publisher-1448185.ConveyorbyKeyoti
The problem is that the Android emulator maps 10.0.2.2 to 127.0.0.1, not to localhost. So configure your web server to serveron 127.0.0.1:54722 and not localhost:54722. That should do it.
After running your local host you get http://localhost:[port number]/ here you found your port number.
Then get your IP address from Command, Open your windows command and type ipconfig
In my case, IP was 192.168.10.33 so my URL will be http://192.168.10.33:[port number]/.
In Android, the studio uses this URL as your URL. And after that set your URL and your port number in manual proxy for the emulator.
I have a webserver running on my localhost.
If I open up the emulator and want to connect to my localhost I am using 192.168.x.x. This means you should use your local lan ip address. By the way, your HttpResponseException (Bad Request) doesn't mean that the host is not reachable.
Some other errors lead to this exception.
To access localhost on Android Emulator
Add the internet permission from AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET" />
Add android:usesCleartextTraffic="true", more details here:
Run the below-mentioned command to find your system IP address:
ifconfig | grep "inet " | grep -v 127.0.0.1
Copy the IP address obtained from this step (A)
Run your backend application, which you can access at localhost or 127.0.0.1 from your sytem.
Now in android studio, you can replace the URL if you're using in code or You can use the ip address obtained from step(A) and try opening in web browser,
Like this http://192.168.0.102:8080/
Don't forget to add PORT after the IP address, in my case app was running on 8080 port so I added IP obtained in (A) with the port 8080
you need to set URL as 10.0.2.2:portNr
portNr = the given port by ASP.NET Development Server my current service is running on localhost:3229/Service.svc
so my url is 10.0.2.2:3229
i'd fixed my problem this way
i hope it helps...
"BadRequest" is an error which usually got send by the server itself, see rfc 2616
10.4.1 400 Bad Request
The request could not be understood by the server due to malformed syntax. The client SHOULD NOT repeat the request without modifications.
So you got a working connection to the server, but your request doesn't fit the expecet form. I don't know how you create the connection, what headers are included (if there are any) – but thats what you should checking for.
If you need more help about, explain what your code is about and what it uses to connect to the Server, so we have the big picture.
Here is a question with the same Problem – the answer was that the content-type wasnt set in the header.
1) Run ipconfig command in cmd
2) You will get result like this
3) Then use IPv4 Address of VMWare Network Adapter 1 followed by port number
In My Case its 8080, so instead of using localhost:8080
I am using 192.168.56.1:8080
Done.....
I would like to show you the way I access IISExpress Web APIs from my Android Emulator. I'm using Visual Studio 2015. And I call the Android Emulator from Android Studio.
All of what I need to do is adding the following line to the binding configuration in my applicationhost.config file
<binding protocol="http" bindingInformation="*:<your-port>:" />
Then I check and use the IP4 Address to access my API from Android emulator
Requirement: you must run Visual Studio as Administrator. This post gives a perfect way to do this.
For more details, please visit my post on github
Hope this helps.
For Laravel Homestead Users:
If anyone using Laravel with homestead you can access app backend using 192.168.10.10 in emulator
Still not working?
Another good solution is to use ngrok https://ngrok.com/
I am using Windows 10 as my development platform, accessing 10.0.2.2:port in my emulator is not working as expected, and the same result for other solutions in this question as well.
After several hours of digging, I found that if you add -writable-system argument to the emulator startup command, things will just work.
You have to start an emulator via command line like below:
emulator.exe -avd <emulator_name> -writable-system
Then in your emulator, you can access your API service running on host machine, using LAN IP address and binding port:
http://192.168.1.2:<port>
Hope this helps you out.
About start emulator from command line: https://developer.android.com/studio/run/emulator-commandline.
Explanation why localhost is not available from emulators for anyone who has basic access problem. For sophisticated cases read other answers.
Problem: Emulator has own local network and localhost maps itself to emulator, but NOT your host!
Solution:
Bind your server to 0.0.0.0 to make it available for emulator's network
Get external IP address of your laptop: ifconfig command for Mac
In Android (or Flutter app) use IP address of your external interface like: 192.168.1.10 instead of localhost
I had the same issue when I was trying to connect to my IIS .NET Webservice from the Android emulator.
install npm install -g iisexpress-proxy
iisexpress-proxy 53990 to 9000 to proxy IIS express port to 9000 and access port 9000 from emulator like "http://10.0.2.2:9000"
the reason seems to be by default, IIS Express doesn't allow connections from network
https://forums.asp.net/t/2125232.aspx?Bad+Request+Invalid+Hostname+when+accessing+localhost+Web+API+or+Web+App+from+across+LAN
localhost seemed to be working fine in my emulator at start and then i started getting connection refused exception
i used 127.0.2.2 from the emulator browser and it worked and when i used this in my android app in emulator it again started showing the connection refused problem.
then i did ifconfig and i used the ip 192.168.2.2 and it worked perfectly
Bad request generally means the format of the data you are sending is incorrect. May be mismatched data mapping . If you are getting bad request implies you are able to connect to the server, but the request is not being sent properly.
If anybody is still looking for this, this is how it worked for me.
You need to find the IP of your machine with respect to the device/emulator you are connected. For Emulators on of the way is by following below steps;
Go to VM Virtual box -> select connected device in the list.
Select Settings ->Network-> Find out to which network the device is attached. For me it was 'VirtualBox Host-Only Ethernet Adapter #2'.
In virtualbox go to Files->Preferences->Network->Host-Only Networks, and find out the IPv4 for the network specified in above step. (By Hovering you will get the info)
Provide this IP to access the localhost from emulator. The Port is same as you have provided while running/publishing your services.
Note #1 : Make sure you have taken care of firewalls and inbound rules.
Note #2 : Please check this IP after you restart your machine. For some reason, even If I provided "Use the following IP" The Host-Only IP got changed.
I resolved exact the problem when the service layer is using Visual Studio IIS Express. Just point to 10.0.2.2:port wont work. Instead of messing around the IIS Express as mentioned by other posts, I just put a proxy in front of the IIS Express. For example, apache or nginx. The nginx.conf will look like
# Mobile API
server {
listen 8090;
server_name default_server;
location / {
proxy_pass http://localhost:54722;
}
}
Then the android needs to points to my IP address as 192.168.x.x:8090
if you are using some 3rd party package like node express or angular-cli you will need to find the IP of your machine, and attach your host to that IP within the server startup config (instead of localhost). Then launch it from the emulator using the IP. For example, I had to use: ng serve -H 10.149.212.104 to use the angular-cli. Then from the emulator I used: http://10.149.212.104:4200
If you are working with Asp.Net Web API, in .vs/config folder inside your project, modify these lines as per you port setting. Let suppose you use port 1234 and physicalPath to the project folder set by IIS is "D:\My Projects\YourSiteName", then
<site name="YourSiteName" id="1">
<application path="/" applicationPool="Clr4IntegratedAppPool">
<virtualDirectory path="/" physicalPath="D:\My Projects\YourSiteName" />
</application>
<bindings>
<binding protocol="http" bindingInformation="*:1234:*" />
</bindings>
</site>
In android studio, access your api with "http://10.0.2.2:1234" ...