之前查了好多大牛的部落格，總結了一下。

把程式碼分享給大家。     

功能：建立熱點、獲取熱點名、檢查是否開啟wifi熱點、關閉熱點、開熱點手機獲取其他連入手機IP地址

想了解wifi開發的，看我的下一篇文章。   http://blog.csdn.net/guang_liang_/article/details/55224757

public class Wifi_APManager {

    private WifiManager mWifiManager;
private Context mContext;
public Wifi_APManager(Context context){
        this
 
.mContext=context;
mWifiManager=(WifiManager)context.getSystemService(Context.WIFI_SERVICE);
}


    /**
     * 建立熱點
* @param mSSID 熱點名稱
* @param mPasswd 熱點密碼
* @param isOpen 是否是開放熱點
*/
public void startWifiAp(String mSSID,String mPasswd,boolean isOpen){
       Method method1=null;
try {
           method1=mWifiManager
 
.getClass().getMethod("setWifiApEnabled",
WifiConfiguration.class,boolean.class);
WifiConfiguration netConfig=new WifiConfiguration();
netConfig.SSID=mSSID;
netConfig.preSharedKey=mPasswd;
netConfig.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
netConfig.allowedProtocols.set(WifiConfiguration.Protocol
 
.RSN);
netConfig.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
if (isOpen) {
               netConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
}else {
               netConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
}
           netConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
netConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
netConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
netConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
method1.invoke(mWifiManager,netConfig,true);
} catch (NoSuchMethodException e) {
           e.printStackTrace();
} catch (InvocationTargetException e) {
           e.printStackTrace();
} catch (IllegalAccessException e) {
           e.printStackTrace();
}
    }

    /**獲取熱點名**/
public String getApSSID() {
        try {
            Method localMethod = this.mWifiManager.getClass().getDeclaredMethod("getWifiApConfiguration", new Class[0]);
if (localMethod == null) return null;
Object localObject1 = localMethod.invoke(this.mWifiManager,new Object[0]);
if (localObject1 == null) return null;
WifiConfiguration localWifiConfiguration = (WifiConfiguration) localObject1;
if (localWifiConfiguration.SSID != null) return localWifiConfiguration.SSID;
Field localField1 = WifiConfiguration.class .getDeclaredField("mWifiApProfile");
if (localField1 == null) return null;
localField1.setAccessible(true);
Object localObject2 = localField1.get(localWifiConfiguration);
localField1.setAccessible(false);
if (localObject2 == null)  return null;
Field localField2 = localObject2.getClass().getDeclaredField("SSID");
localField2.setAccessible(true);
Object localObject3 = localField2.get(localObject2);
if (localObject3 == null) return null;
localField2.setAccessible(false);
String str = (String) localObject3;
return str;
} catch (Exception localException) {
        }
        return null;
}


    /**
     * 檢查是否開啟Wifi熱點
* @return
*/
public boolean isWifiApEnabled(){
        try {
            Method method=mWifiManager.getClass().getMethod("isWifiApEnabled");
method.setAccessible(true);
return (boolean) method.invoke(mWifiManager);
} catch (NoSuchMethodException e) {
            e.printStackTrace();
} catch (InvocationTargetException e) {
            e.printStackTrace();
} catch (IllegalAccessException e) {
            e.printStackTrace();
}
        return false;
}

    /**
     * 關閉熱點
*/
public void closeWifiAp(){
        WifiManager wifiManager= (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
if (isWifiApEnabled()){
            try {
                Method method=wifiManager.getClass().getMethod("getWifiApConfiguration");
method.setAccessible(true);
WifiConfiguration config= (WifiConfiguration) method.invoke(wifiManager);
Method method2=wifiManager.getClass().getMethod("setWifiApEnabled",WifiConfiguration.class,boolean.class);
method2.invoke(wifiManager,config,false);
} catch (NoSuchMethodException e) {
                e.printStackTrace();
} catch (InvocationTargetException e) {
                e.printStackTrace();
} catch (IllegalAccessException e) {
                e.printStackTrace();
}
        }
    }

    /**
     * 開熱點手機獲得其他連線手機IP的方法
* @return 其他手機IP 陣列列表
*/
public ArrayList<String> getConnectedIP(){
        ArrayList<String> connectedIp=new ArrayList<String>();
try {
            BufferedReader br=new BufferedReader(new FileReader(
                    "/proc/net/arp"));
String line;
while ((line=br.readLine())!=null){
                String[] splitted=line.split(" +");
if (splitted !=null && splitted.length>=4){
                    String ip=splitted[0];
if (!ip.equalsIgnoreCase("ip")){
                        connectedIp.add(ip);
}
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
} catch (IOException e) {
            e.printStackTrace();
}

        return connectedIp;
}

}