首先说一下手机与电脑连接方法：
家里有无线网路由器的话，直接将手机介入无线网就可以了，如果只有手机和笔记本的话，可以打开android的wifi热点。设置-无线和网络-绑定与便携式热点，打开便携式热点。然后用笔记本连接。笔记本自动获取ip的话，就可以通过android上网了。
wifi开发实质还是tcp，udp网络编程
1，基于tcp网络编程：
class Client{
public static final int port=8882;
private Socket s=null;
private String str=null;
private DataOutputStream dos=null;
private DataInputStream dis=null;
private boolean bconn=false;
private Thread th;
public Client(String ip){
th=new Thread(new Received());
connect(ip);
th.start();
}
private void send_msg(){
try {
dos=new DataOutputStream(s.getOutputStream());
dos.writeUTF(str);
dos.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
public void connect(String ip){
try {
s=new Socket(ip, port);
bconn=true;
dis=new DataInputStream(s.getInputStream());
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void release_dis(){
try {
bconn=false;
if(dos!=null){
dos.close();
dos=null;
}
if(dis!=null){
dis.close();
dis=null;
}
if(s!=null){
s.close();
s=null;
}
} catch (IOException e) {
e.printStackTrace();
}
}
private class Received implements Runnable{
@Override
public void run() {
try {
while(bconn){
String msg=dis.readUTF();
Log.e("read msg", msg);
}
} catch(SocketException e){
Log.e("quit msg", "has quit");
}catch (IOException e) {
e.printStackTrace();
}
}
}
}
2，基于udp网络编程：
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;
public class NetClient {
String ip;
private int udp_port;
private DatagramSocket ds=null;
public void connect(String ip,int port){
this.ip=ip;
this.udp_port=port;
try {
ds=new DatagramSocket(udp_port);
} catch (SocketException e1) {
e1.printStackTrace();
}
new Thread(new UDPThread()).start();
}
private class UDPThread implements Runnable{
byte[] buf=new byte[1024];
@Override
public void run() {
while(ds!=null){
DatagramPacket dp=new DatagramPacket(buf, buf.length);
try {
ds.receive(dp);
parse(dp);
System.out.println("receive a package from server");
} catch (IOException e) {
e.printStackTrace();
}
}
}
private void parse(DatagramPacket dp) {
ByteArrayInputStream bais = new ByteArrayInputStream(buf, 0, dp.getLength());
DataInputStream dis = new DataInputStream(bais);
String msg=null;
try {
msg=dis.readUTF();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* send data package to server
* @param ds
* @param ip
* @param udpPort
*/
public void sendMsg(String str) {
if(ds==null)
return;
ByteArrayOutputStream baos=new ByteArrayOutputStream();
DataOutputStream dos=new DataOutputStream(baos);
try {
dos.write(str.getBytes("UTF-8"));
dos.flush();
} catch (IOException e) {
e.printStackTrace();
}
byte[] buf=baos.toByteArray();
try {
DatagramPacket dp=new DatagramPacket(buf, buf.length, new InetSocketAddress(ip, udp_port));
ds.send(dp);
} catch (SocketException e) {
Log.e("udpmsg", e.getMessage());
} catch (IOException e) {
Log.e("udpmsg", e.getMessage());
}
}
3，对wify的设置管理：
import java.util.List;
import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.WifiLock;
public class WifiAdmin
{
//定义WifiManager对象
private WifiManager mWifiManager;
//定义WifiInfo对象
private WifiInfo mWifiInfo;
//扫描出的网络连接列表
private List<ScanResult> mWifiList;
//网络连接列表
private List<WifiConfiguration> mWifiConfiguration;
//定义一个WifiLock
WifiLock mWifiLock;
//构造器
public WifiAdmin(Context context)
{
//取得WifiManager对象
mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
//取得WifiInfo对象
mWifiInfo = mWifiManager.getConnectionInfo();
}
//打开WIFI
public void OpenWifi()
{
if (!mWifiManager.isWifiEnabled())
{
mWifiManager.setWifiEnabled(true);
}
}
//关闭WIFI
public void CloseWifi()
{
if (mWifiManager.isWifiEnabled())
{
mWifiManager.setWifiEnabled(false);
}
}
//锁定WifiLock
public void AcquireWifiLock()
{
mWifiLock.acquire();
}
//解锁WifiLock
public void ReleaseWifiLock()
{
//判断时候锁定
if (mWifiLock.isHeld())
{
mWifiLock.release();
}
}
//创建一个WifiLock
public void CreatWifiLock()
{
mWifiLock = mWifiManager.createWifiLock("Test");
}
//得到配置好的网络
public List<WifiConfiguration> GetConfiguration()
{
return mWifiConfiguration;
}
//指定配置好的网络进行连接
public void ConnectConfiguration(int index)
{
//索引大于配置好的网络索引返回
if(index > mWifiConfiguration.size())
{
return;
}
//连接配置好的指定ID的网络
mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId, true);
}
public void StartScan()
{
mWifiManager.startScan();
//得到扫描结果
mWifiList = mWifiManager.getScanResults();
//得到配置好的网络连接
mWifiConfiguration = mWifiManager.getConfiguredNetworks();
}
//得到网络列表
public List<ScanResult> GetWifiList()
{
return mWifiList;
}
//查看扫描结果
public StringBuilder LookUpScan()
{
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < mWifiList.size(); i++)
{
stringBuilder.append("Index_"+new Integer(i + 1).toString() + ":");
//将ScanResult信息转换成一个字符串包
//其中把包括：BSSID、SSID、capabilities、frequency、level
stringBuilder.append((mWifiList.get(i)).toString());
stringBuilder.append("\n");
}
return stringBuilder;
}
//得到MAC地址
public String GetMacAddress()
{
return (mWifiInfo == null) ? "NULL" : mWifiInfo.getMacAddress();
}
//得到接入点的BSSID
public String GetBSSID()
{
return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID();
}
//得到IP地址
public int GetIPAddress()
{
return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress();
}
//得到连接的ID
public int GetNetworkId()
{
return (mWifiInfo == null) ? 0 : mWifiInfo.getNetworkId();
}
//得到WifiInfo的所有信息包
public String GetWifiInfo()
{
return (mWifiInfo == null) ? "NULL" : mWifiInfo.toString();
}
//添加一个网络并连接
public void AddNetwork(WifiConfiguration wcg)
{
int wcgID = mWifiManager.addNetwork(wcg);
mWifiManager.enableNetwork(wcgID, true);
}
//断开指定ID的网络
public void DisconnectWifi(int netId)
{
mWifiManager.disableNetwork(netId);
mWifiManager.disconnect();
}
}
最后别忘了加权限呀
<!-- 访问权限1、访问联网权限 2、访问连接WIFI的权限 3、改变WIFI的权限 4、改变网络的权限 --> <uses-permission android:name = "android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/> <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>