判断Android设备是否连接网络

来源：互联网发布：数据挖掘技术的发展编辑：程序博客网时间：2024/04/29 21:57

/**  * 判断Android客户端网络是否连接   * @param context  * @return 真假  */public static boolean checkNet(Context context) {                      try {               ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);               if (connectivity != null) {                                  NetworkInfo info = connectivity.getActiveNetworkInfo();                   if (info != null && info.isConnected()) {                                          if (info.getState() == NetworkInfo.State.CONNECTED) {                           return true;                       }                   }               }           } catch (Exception e) {           return false;   }           return false;       }

以上代码只能判断是否有可用的连接，而不能判断是否能连网

* 检验网络连接 并toast提示* * @return*/public boolean note_Intent(Context context) {ConnectivityManager con = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo networkinfo = con.getActiveNetworkInfo();if (networkinfo == null || !networkinfo.isAvailable()) {// 当前网络不可用Toast.makeText(context.getApplicationContext(), "请先连接Internet！",Toast.LENGTH_SHORT).show();return false;}boolean wifi = con.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();if (!wifi) { // 提示使用wifiToast.makeText(context.getApplicationContext(), "建议您使用WIFI以减少流量！",Toast.LENGTH_SHORT).show();}return true;}

以上转自：http://www.iteye.com/topic/1117733

android中判断网络连接是否可用

http://www.cnblogs.com/codeworker/archive/2012/04/23/2467180.html
一、判断网络连接是否可用

public static boolean isNetworkAvailable(Context context) {           ConnectivityManager cm = (ConnectivityManager) context                   .getSystemService(Context.CONNECTIVITY_SERVICE);           if (cm == null) {           } else {　　　　　　　//如果仅仅是用来判断网络连接　　　　　　  //则可以使用 cm.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;       }

二、判断GPS是否打开

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;       }

三、判断WIFI是否打开

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);       }

四、判断是否是3G网络

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;       }

五、判断是wifi还是3g网络,用户的体现性在这里了，wifi就可以建议下载或者在线播放。

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;           }