unit Androidapi.JNI.Network;interfacefunction IsConnected: Boolean;function IsWiFiConnected: Boolean;function IsMobileConnected: Boolean;implementationuses  System.SysUtils,  Androidapi.JNIBridge,  Androidapi.JNI.GraphicsContentViewText,  Androidapi.JNI.JavaTypes,  FMX.Helpers.Android;type  JConnectivityManager = interface;  JNetworkInfo = interface;  JNetworkInfoClass = interface(JObjectClass)  ['{E92E86E8-0BDE-4D5F-B44E-3148BD63A14C}']  end;  [JavaSignature('android/net/NetworkInfo')]  JNetworkInfo = interface(JObject)  ['{6DF61A40-8D17-4E51-8EF2-32CDC81AC372}']    {
    Methods}    function isAvailable: Boolean; cdecl;    function isConnected: Boolean; cdecl;    function isConnectedOrConnecting: Boolean; cdecl;  end;  TJNetworkInfo = class(TJavaGenericImport) end;  JConnectivityManagerClass = interface(JObjectClass)  ['{E03A261F-59A4-4236-8CDF-0068FC6C5FA1}']    {
    Property methods}    function _GetTYPE_WIFI: Integer; cdecl;    function _GetTYPE_WIMAX: Integer; cdecl;    function _GetTYPE_MOBILE: Integer; cdecl;    {
    Properties}    property TYPE_WIFI: Integer read _GetTYPE_WIFI;    property TYPE_WIMAX: Integer read _GetTYPE_WIMAX;    property TYPE_MOBILE: Integer read _GetTYPE_MOBILE;  end;  [JavaSignature('android/net/ConnectivityManager')]  JConnectivityManager = interface(JObject)  ['{1C4C1873-65AE-4722-8EEF-36BBF423C9C5}']    {
    Methods}    function getActiveNetworkInfo: JNetworkInfo; cdecl;    function getNetworkInfo(networkType: Integer): JNetworkInfo; cdecl;  end;  TJConnectivityManager = class(TJavaGenericImport) end;function GetConnectivityManager: JConnectivityManager;var  ConnectivityServiceNative: JObject;begin  ConnectivityServiceNative := SharedActivityContext.getSystemService(TJContext.JavaClass.CONNECTIVITY_SERVICE);  if not Assigned(ConnectivityServiceNative) then    raise Exception.Create('Could not locate Connectivity Service');  Result := TJConnectivityManager.Wrap(    (ConnectivityServiceNative as ILocalObject).GetObjectID);  if not Assigned(Result) then    raise Exception.Create('Could not access Connectivity Manager');end;function IsConnected: Boolean;var  ConnectivityManager: JConnectivityManager;  ActiveNetwork: JNetworkInfo;begin  ConnectivityManager := GetConnectivityManager;  ActiveNetwork := ConnectivityManager.getActiveNetworkInfo;  Result := Assigned(ActiveNetwork) and ActiveNetwork.isConnected;end;function IsWiFiConnected: Boolean;var  ConnectivityManager: JConnectivityManager;  WiFiNetwork: JNetworkInfo;begin  ConnectivityManager := GetConnectivityManager;  WiFiNetwork := ConnectivityManager.getNetworkInfo(TJConnectivityManager.JavaClass.TYPE_WIFI);  Result := WiFiNetwork.isConnected;end;function IsMobileConnected: Boolean;var  ConnectivityManager: JConnectivityManager;  MobileNetwork: JNetworkInfo;begin  ConnectivityManager := GetConnectivityManager;  MobileNetwork := ConnectivityManager.getNetworkInfo(TJConnectivityManager.JavaClass.TYPE_MOBILE);  Result := MobileNetwork.isConnected;end;end.

调用方法：

if  IsConnected  then ShowMessage('IsConnected');if IsWiFiConnected then ShowMessage('IsWiFiConnected');if IsMobileConnected then ShowMessage('IsMobileConnected');