Determine whether a network connection is available in Android

1. Determine whether the network connection is available

Public static Boolean isnetworkavailable (context) {connectivitymanager CM = (connectivitymanager) context. getsystemservice (context. connectivity_service); If (Cm = NULL) {} else {// you can use cm if it is only used to determine the network connection. getactivenetworkinfo (). isavailable (); networkinfo [] info = cm. getallnetworkinfo (); If (info! = NULL) {for (INT I = 0; I <info. length; I ++) {If (info [I]. getstate () = networkinfo. state. connected) {return true ;}}} return false ;}

 

The following code not only determines if the network is not enabled, but also opens the interface for enabling the network. The specific code is as follows:

Protected Boolean checknetwork () {// todo auto-generated method stubboolean flag = false; connectivitymanager cwjmanager = (connectivitymanager) getsystemservice (context. connectivity_service); If (cwjmanager. getactivenetworkinfo ()! = NULL) Flag = cwjmanager. getactivenetworkinfo (). isavailable (); If (! Flag) {builder B = new alertdialog. builder (this ). settitle ("no available network "). setmessage ("enable GPRS or WiFi network connection"); B. setpositivebutton ("OK", new dialoginterface. onclicklistener () {public void onclick (dialoginterface Diener, int which) {// todo auto-generated method stubintent mintent = new intent ("/"); componentname comp = new componentname ("com. android. settings "," com. android. settings. wirelesssettings "); mintent. setcomponent (COMP); mintent. setaction ("android. intent. action. view "); startactivity (mintent );}}). setnegativebutton ("cancel", new dialoginterface. onclicklistener () {public void onclick (dialoginterface diich, int which) {// todo auto-generated method stub dialog. cancel ();}}). create (); B. show ();} return flag ;}

It can be used as follows:
If (! Checknetwork () return;
 

 

Ii. Determine if GPS is enabled

  public static boolean isGpsEnabled(Context context) {           LocationManager lm = ((LocationManager) context                   .getSystemService(Context.LOCATION_SERVICE));           List<String> accessibleProviders = lm.getProviders(true);           return accessibleProviders != null && accessibleProviders.size() > 0;       } 

Iii. Determine whether WiFi is enabled

 

 public static boolean isWifiEnabled(Context context) {           ConnectivityManager mgrConn = (ConnectivityManager) context                   .getSystemService(Context.CONNECTIVITY_SERVICE);           TelephonyManager mgrTel = (TelephonyManager) context                   .getSystemService(Context.TELEPHONY_SERVICE);           return ((mgrConn.getActiveNetworkInfo() != null && mgrConn                   .getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel                   .getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);       } 

4. Determine whether the network is a 3G network

 

    public static boolean is3rd(Context context) {           ConnectivityManager cm = (ConnectivityManager) context                   .getSystemService(Context.CONNECTIVITY_SERVICE);           NetworkInfo networkINfo = cm.getActiveNetworkInfo();           if (networkINfo != null                   && networkINfo.getType() == ConnectivityManager.TYPE_MOBILE) {               return true;           }           return false;       }  

5. Determine whether it is WIFI or 3G network. The user's embodiment is here. WiFi can be downloaded or played online.

  public static boolean isWifi(Context context) {               ConnectivityManager cm = (ConnectivityManager) context                       .getSystemService(Context.CONNECTIVITY_SERVICE);               NetworkInfo networkINfo = cm.getActiveNetworkInfo();               if (networkINfo != null                       && networkINfo.getType() == ConnectivityManager.TYPE_WIFI) {                   return true;               }               return false;           }