android区域连接，Internet连接和云连接

android在网络方面提供下面的功能：提供无线连接网络的方式，使用网络发现服务和Wi-Fi创建点到点的连接。使用XML格式来交换网络数据。在下载和网络交换中，如何减少电池的消耗。

在云方面，可以同步和备份用户数据。

下面是具体内容：

1.网络服务发现允许你的用户发现和识别本地网络的其他设备，这在文件共享和多个玩家的游戏中非常实用。android的NSD API简单的提供了这样的功能。下面讲述如何广播自己的用户名和连接信息，同时可以扫描其他的设备。

public void registerService(int port) {
// Create the NsdServiceInfo object, and populate it.
NsdServiceInfo serviceInfo = new NsdServiceInfo();

// The name is subject to change based on conflicts
// with other services advertised on the same network.
serviceInfo.setServiceName("NsdChat");
serviceInfo.setServiceType("_http._tcp.");
serviceInfo.setPort(port);
....
}

public void initializeServerSocket() {
// Initialize a server socket on the next available port.
mServerSocket = new ServerSocket(0);

// Store the chosen port.
mLocalPort = mServerSocket.getLocalPort();
...
}

public void initializeRegistrationListener() {
mRegistrationListener = new NsdManager.RegistrationListener() {

@Override
public void onServiceRegistered(NsdServiceInfo NsdServiceInfo) {
// Save the service name. Android may have changed it in order to
// resolve a conflict, so update the name you initially requested
// with the name Android actually used.
mServiceName = NsdServiceInfo.getServiceName();
}

@Override
public void onRegistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
// Registration failed! Put debugging code here to determine why.
}

@Override
public void onServiceUnregistered(NsdServiceInfo arg0) {
// Service has been unregistered. This only happens when you call
// NsdManager.unregisterService() and pass in this listener.
}

@Override
public void onUnregistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
// Unregistration failed. Put debugging code here to determine why.
}
};
}

public void registerService(int port) {
NsdServiceInfo serviceInfo = new NsdServiceInfo();
serviceInfo.setServiceName("NsdChat");
serviceInfo.setServiceType("_http._tcp.");
serviceInfo.setPort(port);

mNsdManager = Context.getSystemService(Context.NSD_SERVICE);

mNsdManager.registerService(
serviceInfo, NsdManager.PROTOCOL_DNS_SD, mRegistrationListener);
}

上面是注册的代码。下面是发现网络的代码：

public void initializeDiscoveryListener() {

// Instantiate a new DiscoveryListener
mDiscoveryListener = new NsdManager.DiscoveryListener() {

// Called as soon as service discovery begins.
@Override
public void onDiscoveryStarted(String regType) {
Log.d(TAG, "Service discovery started");
}

@Override
public void onServiceFound(NsdServiceInfo service) {
// A service was found! Do something with it.
Log.d(TAG, "Service discovery success" + service);
if (!service.getServiceType().equals(SERVICE_TYPE)) {
// Service type is the string containing the protocol and
// transport layer for this service.
Log.d(TAG, "Unknown Service Type: " + service.getServiceType());
} else if (service.getServiceName().equals(mServiceName)) {
// The name of the service tells the user what they'd be
// connecting to. It could be "Bob's Chat App".
Log.d(TAG, "Same machine: " + mServiceName);
} else if (service.getServiceName().contains("NsdChat")){
mNsdManager.resolveService(service, mResolveListener);
}
}

@Override
public void onServiceLost(NsdServiceInfo service) {
// When the network service is no longer available.
// Internal bookkeeping code goes here.
Log.e(TAG, "service lost" + service);
}

@Override
public void onDiscoveryStopped(String serviceType) {
Log.i(TAG, "Discovery stopped: " + serviceType);
}

@Override
public void onStartDiscoveryFailed(String serviceType, int errorCode) {
Log.e(TAG, "Discovery failed: Error code:" + errorCode);
mNsdManager.stopServiceDiscovery(this);
}

@Override
public void onStopDiscoveryFailed(String serviceType, int errorCode) {
Log.e(TAG, "Discovery failed: Error code:" + errorCode);
mNsdManager.stopServiceDiscovery(this);
}
};
}

mNsdManager.discoverServices(
SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, mDiscoveryListener);

连接到网络服务：

public void initializeResolveListener() {
mResolveListener = new NsdManager.ResolveListener() {

@Override
public void onResolveFailed(NsdServiceInfo serviceInfo, int errorCode) {
// Called when the resolve fails. Use the error code to debug.
Log.e(TAG, "Resolve failed" + errorCode);
}

@Override
public void onServiceResolved(NsdServiceInfo serviceInfo) {
Log.e(TAG, "Resolve Succeeded. " + serviceInfo);

if (serviceInfo.getServiceName().equals(mServiceName)) {
Log.d(TAG, "Same IP.");
return;
}
mService = serviceInfo;
int port = mService.getPort();
InetAddress host = mService.getHost();
}
};
}

当应用程序关闭时，注销网络服务：

//In your application's Activity

@Override
protected void onPause() {
if (mNsdHelper != null) {
mNsdHelper.tearDown();
}
super.onPause();
}

@Override
protected void onResume() {
super.onResume();
if (mNsdHelper != null) {
mNsdHelper.registerService(mConnection.getLocalPort());
mNsdHelper.discoverServices();
}
}

@Override
protected void onDestroy() {
mNsdHelper.tearDown();
mConnection.tearDown();
super.onDestroy();
}

// NsdHelper's tearDown method
public void tearDown() {
mNsdManager.unregisterService(mRegistrationListener);
mNsdManager.stopServiceDiscovery(mDiscoveryListener);
}

未完待续............

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