android socket 编程总结
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android socket 编程总结
一 Android 与PC 通讯:
- PC : Java Server
- Android :Java Client
Java Server 源代码:
public class PCSERVER implements Runnable {
public static final String PCIP = "192.168.0.254" ;
public static final int PCPORT = 55555;
public void run() {
try {
System. out .println( "connecting......." );
ServerSocket serverSocket = new ServerSocket( PCPORT );
// 不断获取与客户端的连接(允许与多个客户端进行连接)
while ( true ) {
// 获取与一个客户端的连接
Socket client = serverSocket.accept();
System. out .println( "S: Receiving..." );
try {
// 获取与某个连接上的客户端的输入流
BufferedReader in = new BufferedReader(
new InputStreamReader(client.getInputStream()));
String clientConent = in.readLine();
// 打印出服务端接收的客户端的信息
System. out .println( "Client: " + clientConent );
} catch (Exception e) {
System. out .println( "Server Receive: Error" );
e.printStackTrace();
} finally {
client.close();
System. out .println( "Server Receive: Done." );
}
}
} catch (Exception e) {
System. out .println( "S: Error" );
e.printStackTrace();
}
}
public static void main(String a[]) {
Thread desktopServerThread = new Thread( new PCSERVER());
desktopServerThread.start();
}
}
对上边的源代码做一些介绍:
指定Server 监听的端口和服务器IP 地址。
1
public static final String PCIP = "192.168.0.254";
2
public static final int PCPORT = 55555;
应用之前所指定的IP 和Port 创建一个ServerSocket 对象。
1
ServerSocket serverSocket = new ServerSocket(PCPORT);
用于侦听和捕捉通过Socket 连接的客户端。
1
Socket client = serverSocket.accept();
应用Socket 创建 BufferedReader 对象 , 用于接收Socket Stream 中的数据。
1
BufferedReader in = new BufferedReader(newInputStreamReader(client.getInputStream()));
Android Client 源代码:
public class ClientActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super .onCreate(savedInstanceState);
InetAddress serverAddr;
Socket socket = null ;
String message = "" ;
try {
serverAddr = InetAddress.getByName ( "192.168.0.254" );
Log.d ( "TCP" , "C: Connecting..." );
// 与服务器获取连接
socket = new Socket(serverAddr, 55555);
message = "Hello eoeandroid !" ;
} catch (UnknownHostException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} // TCPServer.SERVERIP
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
Log.d ( "TCP" , "C: Sending: '" + message + "'" );
// 获取 Client 端的输出流
PrintWriter out = new PrintWriter( new BufferedWriter(
new OutputStreamWriter(socket.getOutputStream())), true );
out.println(message);
} catch (Exception e) {
Log.e ( "TCP" , "S: Error" , e);
} finally {
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
对上边的源代码做一些介绍:
指定Server 的IP 地址。
1
InetAddress serverAddr = InetAddress.getByName("192.168.0.254");
应用Server 的IP 和端口建立Socket 对象。
1
Socket socket = new Socket(serverAddr, 55555);
根据已经建立的Socket 来创建PrintWriter ,将信息通过这个对象来发送给Server ,其中包含了三个部分:
- OutputStreamWriter
- BufferedWriter
- PrintWriter
1
PrintWriter out = new PrintWriter( new BufferedWriter( newOutputStreamWriter(socket.getOutputStream())),true);
二 Android 蓝牙通讯:
Package name: android.bluetooth.* , 主要相关类介绍如下:
- BluetoothAdapter: 本地蓝牙设备的适配类,所有的蓝牙操作都要通过该类完成;
- BluetoothDevice: 蓝牙设备类,代表了蓝牙通讯过程中的远端设备;
- BluetoothSocket: 蓝牙通讯套接字,代表了与远端设备的连接点,使用socket 本地程序可以通过inputstream 和outputstream 与远端程序进行通讯;
- BluetoothServerSocket: 服务器通讯套接字,与TCP ServerSocket 类似;
- BluetoothClass: 用于描述远端设备的类型,特点等信息,通过getBluetoothClass() 方法获取代表远端设备属性的BluetoothClass 对象。
使用蓝牙必须获取的权限:
一定要在AndroidManifest.xml 配置文件中配置上一下两个权限否则蓝牙设备是不可用的
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
建立蓝牙连接:
通过BluetoothAdapter.getDefaultAdapter() 方法获取BluetoothAdapter 对象。
判断当前蓝牙是否启动,如果没有启动提示用户手动启动:
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
在Activity 的onActivityResult() 方法中,对用户的设定结果进行处理。
搜寻远端蓝牙设备
首先获取已配对的远端设备:
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
然后通过BluetoothAdapter.startDiscovery() 方法启动蓝牙设备的搜寻。这是个异步方法,调用的时候立刻就会返回。为了获得搜寻的结果,必须在用户自己的Activity 中注册一个BroadcastReceiver ,代码如下:
// Create a BroadcastReceiver for ACTION_FOUND
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a ListView
mArrayAdapter.add(device.getName() + "/n" + device.getAddress());
}
}
};
// Register the BroadcastReceiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy
设置本地设备可以被发现
只有将本地设备设置为可被发现,远端的蓝牙设备才能够找到并和本地设备建立连接。通过下面的代码发送Intent 对象,让用户手动启动可发现设置。
Intent discoverableIntent = new
Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
在本地设备可发现的过程中,可以通过注册BroadcastReceiver 监听可发现状态的改变。
实现编码片段 :
服务端
UUID uuid = uuid.fromString(“27648B4D-D854-5674-FA60E4F535E44AF7 ″ );
BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
BluetoothServerSocket serverSocket = adapter.listenUsingRfcommWithServiceRecord(“MyBluetoothApp”, uuid);
BluetoothSocket socket = serverSocket.accept(); // blocks until a connection is accepted
serverSocket.close(); // close the listening socket
客户端:
UUID uuid = uuid.fromString(“27648B4D-D854-5674-FA60E4F535E44AF7 ″ ); // UUID of server socket
BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice device = adapter.getRemoteDevice(“00:11:22:33:44:55 ″ ); // BT MAC address of s erver
// 发现连接后会获取服务端 socket 套接字
BluetoothSocket socket = device.createRfcommSocketToServiceRecord(uuid);
// 取消主动发现设备
adapter.cancelDiscovery();
// 与服务端建立连接
adapter.connect();
双方连接上后,就开始读写了
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
out.write(…);
in.read(…);
…
in.close();
out.close();
socket.close();
通信方式跟 socket 通信原理是一样的,只不过协议不一样,但是协议对于用户都是封装的,用户不必担心。
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