Android - 判断网络状态

Android手机同时支持WIFI和3G, 判断网络连接, 判断网络类型(WIFI或3G).

权限:

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

判断网络连接

    /** * 判断网络是否可用, 在使用网络请求是预先使用此方法进行检查, 以节省资源. * * @return 可用状态 */      public static boolean isNetAvailable() {          Context context = App.getAppContext();          ConnectivityManager manager = (ConnectivityManager)               context.getSystemService(Context.CONNECTIVITY_SERVICE);          NetworkInfo info = manager.getActiveNetworkInfo();          return (info != null && info.isAvailable() && info.isConnected());      }

判断网络类型

ConnectivityManager conMan = (ConnectivityManager)       context.getSystemService(Context.CONNECTIVITY_SERVICE);    // 3G  State mobile = conMan.getNetworkInfo(0).getState();    // WIFI  State wifi = conMan.getNetworkInfo(1).getState();    if (mobile == NetworkInfo.State.CONNECTED       || mobile == NetworkInfo.State.CONNECTING) {      // TODO: in mobile do something  } else if (wifi == NetworkInfo.State.CONNECTED               || wifi == NetworkInfo.State.CONNECTING) {      // TODO: in wifi do something  }

更加精细的网络类型:
TelephonyManager#getNetworkType or NetworkInfo#getSubtypeName