- 如何在Android和iOS上检查网络是否可用?
试试这个:
unit Network;
interface
function IsConnected: Boolean;
function IsWiFiConnected: Boolean;
function IsMobileConnected: Boolean;
implementation
uses
System.SysUtils,
Androidapi.JNIBridge,
Androidapi.JNI.GraphicsContentViewText,
Androidapi.JNI.JavaTypes,
FMX.Helpers.Android, Androidapi.Helpers, Misc;
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<JNetworkInfoClass, JNetworkInfo>) 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<JConnectivityManagerClass, JConnectivityManager>) 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.
感谢blong提供的解决方案。为了让它在Delphi Berlin上运行,我重新编写了模块代码。希望这对你有用。
在RAD 10.1中可以完全使用Androidapi.JNI.Net.pas模块。但是为了学习,将建议的功能放入单独的模块中可能会更有用。
unit Androidapi.JNI.Network;
interface
function IsConnected: Boolean;
function IsWiFiConnected: Boolean;
function IsMobileConnected: Boolean;
implementation
uses
System.SysUtils,
Androidapi.JNIBridge,
Androidapi.JNI.GraphicsContentViewText,
Androidapi.JNI.JavaTypes,
Androidapi.JNI.Net,
FMX.Helpers.Android,
Androidapi.Helpers;
// 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<JNetworkInfoClass, JNetworkInfo>)
// 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<JConnectivityManagerClass, JConnectivityManager>)
// end;
function GetConnectivityManager: JConnectivityManager;
var
ConnectivityServiceNative: JObject;
begin
ConnectivityServiceNative := TAndroidHelper.Context.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.
uses System.Net.HttpClient
function CheckInternet: boolean;
begin
Result := false;
with THTTPClient.Create do
try
try
Result := Head('http://google.com').StatusCode < 400;
except
end;
finally
Free;
end;
end;
SharedActivitiyContext.getSystemService(TJContext.JavaClass.ConnectivityService)
在fmxexpress网站上的解决方案。通常使用IdTCPClient组件并检查是否可以连接到google.com