public class NetworkProber {?

/**?
* 網絡是否可用?
*?
* @param activity?
* @return?
*/?
public static boolean isNetworkAvailable(Context context) {?
ConnectivityManager connectivity = (ConnectivityManager) context?
.getSystemService(Context.CONNECTIVITY_SERVICE);?
if (connectivity == null) {?
} else {?
NetworkInfo[] info = connectivity.getAllNetworkInfo();?
if (info != null) {?
for (int i = 0; i < info.length; i++) {?
if (info[i].getState() == NetworkInfo.State.CONNECTED) {?
return true;?
}?
}?
}?
}?
return false;?
}?

/**?
* Gps是否打開?
*?
* @param context?
* @return?
*/?
public static boolean isGpsEnabled(Context context) {?
LocationManager locationManager = ((LocationManager) context?
.getSystemService(Context.LOCATION_SERVICE));?
List<String> accessibleProviders = locationManager.getProviders(true);?
return accessibleProviders != null && accessibleProviders.size() > 0;?
}?

/**?
* wifi是否打開?
*/?
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);?
}?

/**?
* 判斷當前網絡是否是wifi網絡?
* if(activeNetInfo.getType()==ConnectivityManager.TYPE_MOBILE) { //判斷3G網?
*?
* @param context?
* @return boolean?
*/?
public static boolean isWifi(Context context) {?
ConnectivityManager connectivityManager = (ConnectivityManager) context?
.getSystemService(Context.CONNECTIVITY_SERVICE);?
NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();?
if (activeNetInfo != null?
&& activeNetInfo.getType() == ConnectivityManager.TYPE_WIFI) {?
return true;?
}?
return false;?
}?

/**?
* 判斷當前網絡是否是3G網絡?
*?
* @param context?
* @return boolean?
*/?
public static boolean is3G(Context context) {?
ConnectivityManager connectivityManager = (ConnectivityManager) context?
.getSystemService(Context.CONNECTIVITY_SERVICE);?
NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();?
if (activeNetInfo != null?
&& activeNetInfo.getType() == ConnectivityManager.TYPE_MOBILE) {?
return true;?
}?
return false;?
}?
}?
另外還有兩個方法判斷網絡是否可用：

public static boolean isNetworkAvailable_00(Context context) {?
ConnectivityManager cm = ((ConnectivityManager) context?
.getSystemService(Context.CONNECTIVITY_SERVICE));?
if (cm != null) {?
NetworkInfo info = cm.getActiveNetworkInfo();?
if (info != null && info.isConnectedOrConnecting()) {?
return true;?
}?
}?
return false;?
}?

public static boolean isNetworkAvailable_01(Context context) {?
ConnectivityManager cm = (ConnectivityManager) context?
.getSystemService(Context.CONNECTIVITY_SERVICE);?
NetworkInfo network = cm.getActiveNetworkInfo();?
if (network != null) {?
return network.isAvailable();?
}?
return false;?
}?
更加嚴謹的寫法：?
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;?
}

總結

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