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Added in API level 21

Network

public class Network
extends Object implements Parcelable

java.lang.Object
   ↳ android.net.Network


标识Network 这通过ConnectivityManager.NetworkCallback提供给应用程序以响应有效的requestNetwork(NetworkRequest, PendingIntent)或无源registerNetworkCallback(NetworkRequest, PendingIntent)调用。 它用于将流量引导至给定的Network ,或者以Socket基础,通过目标SocketFactory或流程范围bindProcessToNetwork(Network)

Summary

Inherited constants

From interface android.os.Parcelable

Fields

public static final Creator<Network> CREATOR

Public methods

void bindSocket(DatagramSocket socket)

将指定的 DatagramSocket绑定到这个 Network

void bindSocket(Socket socket)

将指定的 Socket绑定到这个 Network

void bindSocket(FileDescriptor fd)

将指定的 FileDescriptor绑定到这个 Network

int describeContents()

描述此Parcelable实例的封送表示中包含的特殊对象的种类。

boolean equals(Object obj)

指示其他某个对象是否“等于”这一个。

InetAddress[] getAllByName(String host)

除了在此网络上完成主机解析之外,其他操作与 InetAddress.getAllByName相同。

InetAddress getByName(String host)

除了在此网络上完成主机解析之外,其他操作与 InetAddress.getByName相同。

long getNetworkHandle()

返回代表这个 Network的句柄,用于NDK API。

SocketFactory getSocketFactory()

返回绑定到此网络的 SocketFactory

int hashCode()

返回对象的哈希码值。

URLConnection openConnection(URL url)

打开指定 URL这个 Network ,这样所有的流量都将在网络上发送。

URLConnection openConnection(URL url, Proxy proxy)

打开指定 URL这个 Network ,这样所有的流量都将在网络上发送。

String toString()

返回对象的字符串表示形式。

void writeToParcel(Parcel dest, int flags)

将此对象平铺到一个包裹中。

Inherited methods

From class java.lang.Object
From interface android.os.Parcelable

Fields

CREATOR

Added in API level 21
Creator<Network> CREATOR

Public methods

bindSocket

Added in API level 22
void bindSocket (DatagramSocket socket)

将指定的DatagramSocket绑定到此Network 无论通过bindProcessToNetwork(Network)设置的任何进程范围网络绑定,套接字上的所有数据通信都将在此Network上发送。 插座不能连接。

Parameters
socket DatagramSocket
Throws
IOException

bindSocket

Added in API level 21
void bindSocket (Socket socket)

将指定的Socket绑定到这个Network 套接字上的所有数据通信都将在此Network上发送,而不考虑由bindProcessToNetwork(Network)设置的任何进程范围网络绑定。 插座不能连接。

Parameters
socket Socket
Throws
IOException

bindSocket

Added in API level 23
void bindSocket (FileDescriptor fd)

将指定的FileDescriptor绑定到这个Network 由此文件描述符表示的套接字上的所有数据通信都将在此Network上发送,而不考虑由bindProcessToNetwork(Network)设置的任何进程范围网络绑定。 插座不能连接。

Parameters
fd FileDescriptor
Throws
IOException

describeContents

Added in API level 21
int describeContents ()

描述此Parcelable实例的封送表示中包含的特殊对象的种类。 例如,如果对象将在writeToParcel(Parcel, int)的输出中包含writeToParcel(Parcel, int) ,则此方法的返回值必须包含CONTENTS_FILE_DESCRIPTOR位。

Returns
int a bitmask indicating the set of special object types marshaled by this Parcelable object instance.

equals

Added in API level 21
boolean equals (Object obj)

指示其他某个对象是否“等于”这一个。

equals方法在非空对象引用上实现等价关系:

  • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
  • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
  • It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
  • For any non-null reference value x, x.equals(null) should return false.

Objectequals方法实现了对象上最可能的等价关系; 也就是说,对于任何非空参考值xy ,当且仅当xy引用同一对象( x == y的值为true )时,此方法返回true

请注意,无论何时覆盖此方法,通常都必须覆盖 hashCode方法,以便维护 hashCode方法的常规协定,该方法声明等同对象必须具有相同的哈希代码。

Parameters
obj Object: the reference object with which to compare.
Returns
boolean true if this object is the same as the obj argument; false otherwise.

getAllByName

Added in API level 21
InetAddress[] getAllByName (String host)

除了在该网络上完成主机解析之外,其他操作与 InetAddress.getAllByName相同。

Parameters
host String: the hostname or literal IP string to be resolved.
Returns
InetAddress[] the array of addresses associated with the specified host.
Throws
UnknownHostException if the address lookup fails.

getByName

Added in API level 21
InetAddress getByName (String host)

除了在该网络上完成主机解析之外,其他操作与 InetAddress.getByName相同。

Parameters
host String: the hostName to be resolved to an address or null.
Returns
InetAddress the InetAddress instance representing the host.
Throws
UnknownHostException if the address lookup fails.

getNetworkHandle

Added in API level 23
long getNetworkHandle ()

返回代表这个 Network的句柄,用于NDK API。

Returns
long

getSocketFactory

Added in API level 21
SocketFactory getSocketFactory ()

返回绑定到此网络的SocketFactory 此工厂创建的任何Socket都将通过此Network发送流量。 请注意,如果此Network断开连接,则此工厂以及它过去或未来生成的任何Socket都将停止工作。

Returns
SocketFactory a SocketFactory which produces Socket instances bound to this Network.

hashCode

Added in API level 21
int hashCode ()

返回对象的哈希码值。 为了散列表的好处而支持此方法,例如由HashMap提供的HashMap

hashCode的总合同是:

  • Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
  • If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
  • It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

尽可能合理实用,类Object定义的hashCode方法确实为不同的对象返回不同的整数。 (这通常通过将对象的内部地址转换为整数来实现,但Java TM编程语言不需要此实现技术。)

Returns
int a hash code value for this object.

openConnection

Added in API level 21
URLConnection openConnection (URL url)

打开指定URL这个Network ,这样所有的流量都将在网络上发送。 URL协议必须是HTTPHTTPS

Parameters
url URL
Returns
URLConnection a URLConnection to the resource referred to by this URL.
Throws
MalformedURLException if the URL protocol is not HTTP or HTTPS.
IOException if an error occurs while opening the connection.

也可以看看:

openConnection

Added in API level 23
URLConnection openConnection (URL url, 
                Proxy proxy)

打开指定URL这个Network ,这样所有的流量都将在网络上发送。 URL协议必须是HTTPHTTPS

Parameters
url URL
proxy Proxy: the proxy through which the connection will be established.
Returns
URLConnection a URLConnection to the resource referred to by this URL.
Throws
MalformedURLException if the URL protocol is not HTTP or HTTPS.
IllegalArgumentException if the argument proxy is null.
IOException if an error occurs while opening the connection.

也可以看看:

toString

Added in API level 21
String toString ()

返回对象的字符串表示形式。 一般而言, toString方法返回一个“文本表示”该对象的字符串。 结果应该是一个简洁但内容丰富的表述,对于一个人来说很容易阅读。 建议所有子类重写此方法。

ObjecttoString方法返回一个字符串,其中包含对象为实例的类的名称,符号字符“ @ ”以及对象的哈希码的无符号十六进制表示形式。 换句话说,这个方法返回一个字符串,其值等于:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

Returns
String a string representation of the object.

writeToParcel

Added in API level 21
void writeToParcel (Parcel dest, 
                int flags)

将此对象平铺到一个包裹中。

Parameters
dest Parcel: The Parcel in which the object should be written.
flags int: Additional flags about how the object should be written. May be 0 or PARCELABLE_WRITE_RETURN_VALUE.

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