NightWing1998/AttendiFi

A WiFi based attendance system with barcode authentication

AttendiFi

It is an application that helps a faculty take attendance in the classroom. The only constraint is that faculty and students have to be on the same network. We are open to issues.

Initial set up ( QR Code Scanning and Generation )

• Change the build.gradle(Module : app) file with the following code:

   		...
   		android {
   			...
   			compileSdkVersion 26
   			defaultConfig {
   				...
   				minSdkVersion 15
       			targetSdkVersion 26
       			multiDexEnabled true
   				...
   			}
   			...
   		}
   		...
   		dependencies {
   			...
   			implementation fileTree(dir: 'libs', include: ['*.jar'])
   			implementation 'com.android.support:appcompat-v7:26.1.0'
   			implementation 'com.google.android.gms:play-services:12.0.1'
   			implementation 'com.android.support:multidex:1.0.3'
   			...
   		}
   		...

• Install Google Play services

• Scanning done!!

  Please refer to the the commit with the same message to view the changes

• Modify build.gradle again to use Zxing library

   	dependencies{
   		...
   		implementation 'com.google.zxing:core:3.2.1'
   		implementation 'com.journeyapps:zxing-android-embedded:3.2.0@aar'
   		...
   	}

• QR Code Generation done!!

  Please refer to the commit with the same message to view the changes

• Initial scan and process:

IP Address and encoding

• Get the IP Address of the device:

   	public String getLocalIpAddress(){
   		try {
   			for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();
   				en.hasMoreElements();) {
   				NetworkInterface intf = en.nextElement();
   				for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
   					InetAddress inetAddress = enumIpAddr.nextElement();
   					if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) {
   						return inetAddress.getHostAddress();
   					}
   				}
   			}
   		} catch (Exception ex) {
   			Log.i("IP Address", ex.toString());
   		}
   		return null;
   	};

• Encode the IP Address around random text and mark it with hash for easy decomposition

   	...
   	String all = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMONPQRSTUVWXYZ0123456789`~!@$%^&*(){}[]:';\",./<>?";
   	public String random(int len){
   		String res = "";
   		for(int i = 0;i < len;i++){
   			res += all.charAt( (int) (Math.random()*all.length()) );
   		}
   		return res;
   	};
   	...
   	onCreate(){
   		...
   		ip = "#";
  
   		StringTokenizer ipformatted = new StringTokenizer(getLocalIpAddress(),".");
  
   		ip+=ipformatted.nextToken()+"A"+ipformatted.nextToken()+"B"+ipformatted.nextToken()+"C"+ipformatted.nextToken()+"D";
  
   		ip+="#";
  
   		String text = random(64) + ip + random(64 - ip.length());
   		...
   	}
   	...

  But do not forget to modify the AndroidManifest.xml for permissions:

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

Complete App Demo

• Faculty Side

  

• Student Side