How Android judges the network status

Android determines the network status. In the Android operating system, how can we correctly determine whether the network we connect is disconnected? Today, we will make a detailed analysis on this application technique.

 
 

  
  
public class ConnectionChangeReceiver extends 
BroadcastReceiver   
  
  
{   
  
  
@Override   
  
  
public void onReceive( Context context, Intent intent )   
  
  
{   
  
  
ConnectivityManager connectivityManager = 
(ConnectivityManager) context.getSystemService
( Context.CONNECTIVITY_SERVICE );   
  
  
NetworkInfo activeNetInfo = connectivityManager.
getActiveNetworkInfo();   
  
  
NetworkInfo mobNetInfo = connectivityManager.getNetworkInfo
( ConnectivityManager.TYPE_MOBILE );   
  
  
if ( activeNetInfo != null )   
  
  
{   
  
  
Toast.makeText( context, "Active Network Type : " + 
activeNetInfo.getTypeName(), Toast.LENGTH_SHORT ).show();   
  
  
}   
  
  
if( mobNetInfo != null )   
  
  
{   
  
  
Toast.makeText( context, "Mobile Network Type : " + 
mobNetInfo.getTypeName(), Toast.LENGTH_SHORT ).show();   
  
  
}   
  
  
}   
  
  
}   
  
  
< !-- Needed to check when the network connection changes -->   
  
  
< uses-permission android:name="android.permission.
ACCESS_NETWORK_STATE"/>   
  
  
< receiver android:name="com.blackboard.androidtest.
receiver.ConnectionChangeReceiver"   
  
  
android:label="NetworkConnection">   
  
  
< intent-filter>   
  
  
< action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>   
  
  
< /intent-filter>   
  
  
< /receiver> 
 
 

The specific application method for Android to determine the network status is described here.