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LocalSocket
版本:Android 4.0 r1
结构
继承关系
public class LocalSocket extends Object
java.lang.Object
android.net.LocalSocket
类概述
在UNIX域名空间内创建一个socket(非服务器),这种类型的socket完全不同于java.net.socket。
构造函数
public LocalSocket ()
创建一个AF_LOCAL/UNIX 套接字。
公共方法
public void bind (LocalSocketAddress bindpoint)
绑定socket到一个端口。仅可由还没有被绑定的实体对象来调用该方法。
参数
bindpoint 端口地址
异常
IOException
public void close ()
关闭socket
异常
IOException
public void connect (LocalSocketAddress endpoint)
将当前socket连接到一个端口,只有当终端地址还没有被连接的情况下才能调用该函数。
参数
endpoint 端口地址
异常
IOException 如果socket 是无效的或地址不存在。
public void connect (LocalSocketAddress endpoint, int timeout)
将当前socket连接到一个端口。
异常
IOException 如果socket 是无效的或地址不存在。
public FileDescriptor[] getAncillaryFileDescriptors()
获取一组由对端通过附加消息传送过来的文件描述符。这个方法会返回最近发送的文件描述符,并且返回空直到收到一个新的描述符。文件描述符仅可以通过常规数据传送,此方法读取一个描述符后仅能返回非空值。
返回值
空或者文件描符数组
异常
IOException
public FileDescriptor getFileDescriptor ()
返回文件描述符,如果文件没有打开或已关闭则返回空。
返回值
文件描述符或空值
public InputStream getInputStream ()
获取输入流。
返回值
input stream对象
异常
若socket已经关闭或者还没建立则抛出IO异常
public LocalSocketAddress getLocalSocketAddress ()
若存在则返回绑定的socket。
返回值
本地socket地址,若匿名则返回空。
public OutputStream getOutputStream ()
获取输出流
返回值
输出流
异常
若socket已经关闭或者还没建立则抛出IO异常
public Credentials getPeerCredentials ()
获取socket对的认证信息。仅对已连接的套接字有效。
返回值
非空; 认证信息
异常
IOException
public int getReceiveBufferSize ()
(译者注:获取接受缓冲区大小)
异常
IOException
public LocalSocketAddress getRemoteSocketAddress()
(译者注:获取socket连接端地址)
public int getSendBufferSize ()
(译者注:获取发送缓冲区大小)
异常
IOException
public int getSoTimeout ()
(译者注:得到远端超时设置)
异常
IOException
public synchronized boolean isBound ()
(译者注:是否已经绑定)
public boolean isClosed ()
(译者注:是否已经关闭连接)
public synchronized boolean isConnected ()
(译者注:是否已连接)
public boolean isInputShutdown ()
(译者注:输入流是否已关闭)
public boolean isOutputShutdown ()
(译者注:输出流是否已关闭)
public void setFileDescriptorsForSend(FileDescriptor[] fds)
将一组文件描述符放入队列准备发送到对端(socket),这些文件描述符在下次发送普通数据时会作为单个辅助消息一同发送出去,请查看桌面linux 系统的“main 7 unix” 的SCM_RIGHT。
参数
Fds 非空,待发送的文件描述符数组。
public void setReceiveBufferSize (int size)
(译者注:设置接受缓冲区大小)
异常
IOException
public void setSendBufferSize (int n)
(译者注:设置发送缓冲区大小)
异常
IOException
public void setSoTimeout (int n)
(译者注:设置远端超时设置)
异常
IOException
public void shutdownInput ()
关闭输入端socket
异常
IOException
public void shutdownOutput ()
关闭输出端socket
异常
IOException
补充
文章精选
示例代码
Android LocalSocket / LocalServerSocket sample code
Platforms: Android SDK 1.0 (Eclipse 3.4.1 + ADT 0.8.0)
main.xml
<Button android:id="@+id/send_1_button"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:text="send 1
request"/>
java文件:
import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.net.LocalServerSocket;
import android.net.LocalSocket;
import android.net.LocalSocketAddress;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
/**
*
* @author Denis Migol
*
*/
public class DemoActivity extends Activity {
public static StringSOCKET_ADDRESS = "your.local.socket.address";
// background threads use this Handler
to post messages to
// the main application thread
private final Handlerhandler = new Handler();
public class NotificationRunnable implements Runnable {
private Stringmessage = null;
public void run() {
if (message != null &&message.length() > 0) {
showNotification(message);
}
}
/**
* @param message the
message to set
*/
public voidsetMessage(String message) {
this.message =message;
}
}
// post this to the Handler when the
background thread notifies
private final NotificationRunnablenotificationRunnable = new NotificationRunnable();
public voidshowNotification(String message) {
Toast.makeText(this,message, Toast.LENGTH_SHORT).show();
}
class SocketListener extends Thread {
private Handlerhandler = null;
private NotificationRunnablerunnable = null;
public SocketListener(Handlerhandler, NotificationRunnablerunnable) {
this.handler =handler;
this.runnable =runnable;
this.handler.post(this.runnable);
}
/**
* Show UI
notification.
* @param message
*/
private voidshowMessage(String message) {
this.runnable.setMessage(message);
this.handler.post(this.runnable);
}
@Override
public void run() {
//showMessage("DEMO: SocketListener started!");
try {
LocalServerSocket server = new LocalServerSocket(SOCKET_ADDRESS);
while (true) {
LocalSocketreceiver = server.accept();
if (receiver != null) {
InputStream input =receiver.getInputStream();
// simply for java.util.ArrayList
intreaded = input.read();
int size = 0;
int capacity = 0;
byte[] bytes = new byte[capacity];
// reading
while (readed!= -1) {
// java.util.ArrayList.Add(E e);
capacity = (capacity * 3)/2 + 1;
//bytes = Arrays.copyOf(bytes, capacity);
byte[] copy = new byte[capacity];
System.arraycopy(bytes, 0, copy, 0, bytes.length);
bytes = copy;
bytes[size++] = (byte)readed;
//
read next byte
readed = input.read();
}
showMessage(new String(bytes, 0, size));
}
}
} catch (IOException e) {
Log.e(getClass().getName(), e.getMessage());
}
}
}
public static voidwriteSocket(String message) throws IOException {
LocalSocketsender = new LocalSocket();
sender.connect(new LocalSocketAddress(SOCKET_ADDRESS));
sender.getOutputStream().write(message.getBytes());
sender.getOutputStream().close();
}
@Override
public voidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new SocketListener(this.handler, this.notificationRunnable).start();
Button send1= (Button)findViewById(R.id.send_1_button);
send1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
writeSocket("hello");
} catch (IOException e) {
Log.e(getClass().getName(), e.getMessage());
}
}
});
}
}