NsdHelper


Source link: https://github.com/rafakob/NsdHelper

NsdHelper

NsdHelper is a wrapper/helper library for Android Network Service Discovery. I've created it for my own purpose (mostly for discovering HTTP services in LAN) to simplify the whole NSD process. I also added couple of nice features (timeout, detailed log) and fixed a #71367 using simple FIFO queue. All public methods are well documented so it should be pretty straightforward to use.

Important!

Please note that it still under development and needs couple of tests. If you find any bugs please post an issue or create a pull request.

Install

Add it in your root build.gradle at the end of repositories:

allprojects {
  repositories {

...
maven {
 url "https://jitpack.io" 
}
  
}
 
}

Add the dependency:

dependencies {

compile 'com.github.rafakob:NsdHelper:VERSION' 
}

How to use it

Setup and config

Class NsdHelper requires activity context in order to create NsdManager instance. There is only one listener ( NsdListener) for all NSD actions (registration, discovery, resolve):

public class MainActivity extends AppCompatActivity implements NsdListener {

  NsdHelper nsdHelper;

 @Override
  protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_login);

 nsdHelper = new NsdHelper(this, this);

nsdHelper.setLogEnabled(true);

nsdHelper.setAutoResolveEnabled(true);

nsdHelper.setDiscoveryTimeout(30);

...
  
}

  ... 
}

Configuration methods:

  • setLogEnabled(boolean enabled) - enable logcat messages (default: false)
  • setAutoResolveEnabled(boolean enabled) - resolve service immediately after it was discovered (default: true)
  • setDiscoveryTimeout(int seconds) - if no new service has been discovered for a timeout interval, discovering will be stopped

Dont forget about internet permissions:

<uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

Registration

nsdHelper.registerService("Chat", NsdType.HTTP);
 ... nsdHelper.unregisterService();

Discovery

nsdHelper.startDiscovery(NsdType.HTTP);
 ... nsdHelper.stopDiscovery();

Resolve

nsdHelper.resolveService(nsdService);

Listeners

There is only one listener common for all actions. Implement NsdListener interface:

@Override public void onNsdRegistered(NsdService registeredService) {
 
}
  @Override public void onNsdDiscoveryFinished() {
 
}
  @Override public void onNsdServiceFound(NsdService foundService) {
 
}
  @Override public void onNsdServiceResolved(NsdService resolvedService) {
 
}
  @Override public void onNsdServiceLost(NsdService lostService) {
 
}
  @Override public void onNsdError(String errorMessage, int errorCode, String errorSource) {
 
}

Example logcat output

D/NsdHelper: Service discovery started. D/NsdHelper: Service found -> Kodi (OpenELEC) D/NsdHelper: Service found -> ds115 D/NsdHelper: Service resolved -> Kodi (OpenELEC), OpenElec.lan/192.168.1.110, port 80, ._http._tcp D/NsdHelper: Service resolved -> ds115, DS115.lan/192.168.1.102, port 5000, ._http._tcp D/NsdHelper: Registered -> Chat D/NsdHelper: Service discovery stopped. D/NsdHelper: Unregistered -> Chat 

License

Copyright 2016 Rafa? Koby?ko  Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License. You may obtain a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. 

Resources

Sample code that shows how to make ListView or other views support the swipe-to-dismiss Android UI pattern.

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'Path' has a very attractive menu sitting on the left bottom corner of the screen. Satellite Menu is the open version of this menu.

Python script to highlight adb logcat output in console.

The HttpResponseCache library provides transparent and automatic caching of HTTP and HTTPS requests that use the java.net.HttpUrlConnection classes.

For information on how to use HttpUrlConnection, refer to the Android documentation - don't worry, the information also applies to non-Android Java.

Smooth activity switch animation.

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