1、获得网络信息
首先在AndroidManifest.xml中加入权限
<uses-permission android:name=
"android.permission.ACCESS_NETWORK_STATE"
/>
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Code代码如下：
public
class
MainActivity
extends
Activity {
TextView netWorkTextView;
ConnectivityManager cManager;
NetworkInfo networkInfo;
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
netWorkTextView = (TextView)findViewById(R.id.networkInfo);
cManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
}
@Override
protected
void
onStart()
{
super
.onStart();
networkInfo = cManager.getActiveNetworkInfo();
netWorkTextView.setText(networkInfo.toString());
}
}
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显示入下图：代表的意思，采用WIFI连接，其它不解释。
2 .Socket的网络通信
1）服务端： 新建Android工程SocketServerDemo。
public
class
MainActivity
extends
Activity {
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startService(
new
Intent(
this
,SocketService.
class
));
}
}
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SocketService类
public
class
SocketService
extends
Service{
Thread mServiceThread;
Socket client;
@Override
public
IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return
null
;
}
@Override
public
void
onCreate()
{
super
.onCreate();
mServiceThread =
new
Thread(
new
SocketServerThread());
}
public
class
SocketServerThread
extends
Thread {
private
static
final
int
PORT =
8801
;
private
SocketServerThread() {
}
@Override
public
void
run() {
// TODO Auto-generated method stub
try
{
ServerSocket serverSocket =
new
ServerSocket(PORT);
while
(
true
)
{
System.out.println(
"begin client connected"
);
client = serverSocket.accept();
System.out.println(
"client connected"
);
BufferedReader reader =
new
BufferedReader(
new
InputStreamReader(client.getInputStream()));
System.out.println(
"read from client:"
);
String textLine = reader.readLine();
if
(textLine.equalsIgnoreCase(
"EXIT"
)) {
System.out.println(
"EXIT invoed, closing client"
);
break
;
}
System.out.println(textLine);
PrintWriter writer =
new
PrintWriter(
new
BufferedWriter(
new
OutputStreamWriter(client.getOutputStream())));
writer.println(
"ECHO from server: "
+ textLine);
writer.flush();
writer.close();
reader.close();
}
}
catch
(IOException e) {
// TODO: handle exception
System.err.println(e);
}
}
}
}
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2）客户端：新建Android工程SocketClientDemo
public
class
MainActivity
extends
Activity {
private
static
final
String SERVERIP =
"192.168.1.100"
;
//自己电脑的IP
private
static
final
int
SERVERPORT =
8801
;
TextView mMsgRev;
EditText mMsgEdit;
Button mMsgSendBtn;
String mSendMsg;
String mReceivedMsg;
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mMsgRev = (TextView) findViewById(R.id.receive_msg);
mMsgEdit = (EditText) findViewById(R.id.edit_msg);
mMsgSendBtn = (Button) findViewById(R.id.send_msg);
mMsgSendBtn.setOnClickListener(
new
View.OnClickListener() {
@Override
public
void
onClick(View v) {
// TODO Auto-generated method stub
Socket socket =
null
;
mSendMsg = mMsgEdit.getText().toString();
try
{
socket =
new
Socket(SERVERIP, SERVERPORT);
PrintWriter writer =
new
PrintWriter(
new
BufferedWriter(
new
OutputStreamWriter(socket.getOutputStream())));
writer.println(mSendMsg);
writer.flush();
BufferedReader reader =
new
BufferedReader(
new
InputStreamReader(socket.getInputStream()));
mReceivedMsg = reader.readLine();
if
(mReceivedMsg !=
null
) {
mMsgRev.setText(mReceivedMsg);
}
else
{
mMsgRev.setText(
"receive data error"
);
}
writer.close();
reader.close();
socket.close();
}
catch
(UnknownHostException e) {
// TODO: handle exception
Log.i(
"Error"
, e.getMessage());
}
catch
(IOException e) {
// TODO: handle exception
Log.i(
"Error"
, e.getMessage());
}
}
});
}
}
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其中客户端跑在我的平板上，服务端跑在我的手机上。然后再服务端的文本框中输入文本，点击Send按钮，最后会收到信息。
注意：两个程序的端口号8801都是相同的，客户端的IP地址是我的电脑IP地址，两个程序都要有权限
<uses-permission android:name=
"android.permission.INTERNET"
></uses-permission>
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本文转自Work Hard Work Smart博客园博客，原文链接：http://www.cnblogs.com/linlf03/archive/2013/04/03/2997992.html，如需转载请自行联系原作者
