android网络代码

① android 怎么判断网络状态

获取android系统的连接服务可判断网络连接状态，代码如下
public class NetUtils{
public static boolean isNetworkConnected(Context context){
ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[] infos = cm.getAllNetworkInfo();
for(NetworkInfo info:infos){
if(info.isAvailable()&&info.isConnected()){
return true;
}
}
return false;
}
}

NetworkInfo的isAvailable()和isConnected()有以下5种状态：
在WLAN设置界面
1，显示连接已保存，但标题栏没有，即没有实质连接上：isConnected()==false,isAvailable()=true
2，显示连接已保存，标题栏也有已连接上的图标：isConnected()==true,isAvailable()=true
3，选择不保存后：isConnected()==false,isAvailable()=true
4，选择连接，在正在获取IP地址时：isConnected()==false,isAvailable()=false
5，连接上后：isConnected()==true,isAvailable()=true

② Android开发如何使用代码配置手机wifi的pac地址

这里用到的手机型号为魅族M6120，其中的具体步骤如下：

1、打开手机的设置界面，需要选择无线网络这一项。

③ 在android上查看wifi状态，代码如下：

不知道你的程序报的是什么错，给你一个例子吧，不过方法和你的有点差别：
public class WifiAdmin {
/**WiFi Manager**/
private WifiManager wifimanager;
/**WiFi Information**/
private WifiInfo wifiinfo;
/**Activity NetWork List**/
private List<ScanResult> netlist;
/**Configured NetWork List**/
private List<WifiConfiguration> connectedlist;
/**WiFi Lock**/
private WifiLock wifilock;

public WifiAdmin(Context context) {
wifimanager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
}

/**
* WiFi Operate
* */
/**Open WiFi**/
public void openWifi() {
if (!wifimanager.isWifiEnabled()) {
wifimanager.setWifiEnabled(true);
}
}
/**Close WiFi**/
public void closeWifi() {
if (wifimanager.isWifiEnabled()) {
wifimanager.setWifiEnabled(false);
}
}
/**WiFi State**/
public int checkState() {
return wifimanager.getWifiState();
}

/**
* WiFiLock Operate
* */
/**Create WiFiLock**/
public void creatWifiLock() {
wifilock = wifimanager.createWifiLock("Test");
}
/**Lock WiFi**/
public void acquireWifiLock() {
wifilock.acquire();
}
/**Clear WiFiLock**/
public void releaseWifiLock() {
if (wifilock.isHeld()) {
wifilock.release();
}
}
/**
* WiFiInfo Operate
* */
/**Get WiFiInfo**/
public WifiInfo getWifiInfo(){
wifiinfo = wifimanager.getConnectionInfo();
return wifiinfo;
}

/**
* NetWork Operate
* */
/**Scan**/
public void startScan() {
wifimanager.startScan();
netlist = wifimanager.getScanResults();
connectedlist = wifimanager.getConfiguredNetworks();
}
/**Get Configured NetWork**/
public List<WifiConfiguration> getConfiguration() {
return connectedlist;
}
/**Get Activity NetWork**/
public List<ScanResult> getWifiList() {
return netlist;
}
/**Connect a NetWork**/
public void connectConfiguration(int index) {
if (index < 0 || index > connectedlist.size()) {
return;
}
wifimanager.enableNetwork(connectedlist.get(index).networkId,true);
}
/**Add a NetWork**/
public void addNetwork(WifiConfiguration wcg) {
int wcgID = wifimanager.addNetwork(wcg);
wifimanager.enableNetwork(wcgID, true);
}
/**DisConnect a NetWork**/
public void disconnectWifi(int netId) {
wifimanager.disableNetwork(netId);
wifimanager.disconnect();
}
}