Android WiFi热点开发

上次写了Android连接匿名WiFi的内容。WiFI开发对于应用层开发是比较小众的知识点，不过既然用到了就在此记录下。

创建热点

1、根据加密类型、密码、是否隐藏等参数来创建热点

 static WifiConfiguration createWifiConfig(String SSID, @WifiSecurityType int wifiCipherType, String password, boolean hiddenSSID) {

        WifiConfiguration wifiConfiguration = new WifiConfiguration();
        wifiConfiguration.SSID = convertToQuotedString(SSID);
        wifiConfiguration.hiddenSSID=hiddenSSID;//是否隐藏热点true=隐藏,如果隐藏需要其他设备手动添加网络
        switch (wifiCipherType) {
            case WifiSecurityType.SECURITY_NONE:
                wifiConfiguration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
                break;
            case WifiSecurityType.SECURITY_WEP:
                wifiConfiguration.allowedKeyManagement.set(KeyMgmt.NONE);
                wifiConfiguration.allowedAuthAlgorithms.set(AuthAlgorithm.OPEN);
                wifiConfiguration.allowedAuthAlgorithms.set(AuthAlgorithm.SHARED);
                if (!TextUtils.isEmpty(password)) {
                    int length = password.length();
                    // WEP-40, WEP-104, and 256-bit WEP (WEP-232?)
                    if ((length == 10 || length == 26 || length == 58)
                            && password.matches("[0-9A-Fa-f]*")) {
                        wifiConfiguration.wepKeys[0] = password;
                    } else {
                        wifiConfiguration.wepKeys[0] = '"' + password + '"';
                    }
                }
                break;

            case WifiSecurityType.SECURITY_WPA_PSK:
                wifiConfiguration.allowedKeyManagement.set(KeyMgmt.WPA_PSK);
                if (!TextUtils.isEmpty(password)) {
                    if (password.matches("[0-9A-Fa-f]{64}")) {
                        wifiConfiguration.preSharedKey = password;
                    } else {
                        wifiConfiguration.preSharedKey = '"' + password + '"';
                    }
                }
                break;

            case WifiSecurityType.SECURITY_WPA_EAP:
                wifiConfiguration.allowedKeyManagement.set(KeyMgmt.WPA_EAP);
                wifiConfiguration.allowedKeyManagement.set(KeyMgmt.IEEE8021X);
                wifiConfiguration.enterpriseConfig = new WifiEnterpriseConfig();
                int eapMethod = 0;
                int phase2Method = 0;
                wifiConfiguration.enterpriseConfig.setEapMethod(eapMethod);
                wifiConfiguration.enterpriseConfig.setPhase2Method(phase2Method);
                if (!TextUtils.isEmpty(password)) {
                    wifiConfiguration.enterpriseConfig.setPassword(password);
                }
                break;
            default:
                break;
        }
        return wifiConfiguration;
    }

然后调用WifiManager的setWifiApEnabled方法来设置wifiConfiguration，因为是隐藏的，需要通过反射：

  try {
            Method method = mWifManager.getClass().getMethod(
                    "setWifiApEnabled", WifiConfiguration.class, Boolean.TYPE);
            boolean enable = (Boolean) method.invoke(mWifManager, config, true);

            if (enable) {
                Log.d("WiFi", "热点已开启");
            } else {
                Log.d("WiFi", "创建热点失败");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

关闭热点

关闭热点比较简单，也是用上面的方法，第二个参数传false就行了：

public void closeWifiAp() {
        try {
            Method method = mWifiManager.getClass().getMethod("setWifiApEnabled",      WifiConfiguration.class, boolean.class);
            method.invoke(mWifiManager, null, false);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

监听热点状态

热点的状态可以通过广播的方式来监听：

 public static final String WIFI_AP_STATE_CHANGED_ACTION =
        "android.net.wifi.WIFI_AP_STATE_CHANGED";

不过这个变量是隐藏的，只能直接通过值来注册广播：

   IntentFilter filter = new IntentFilter();
        filter.addAction("android.net.wifi.WIFI_AP_STATE_CHANGED");

然后在广播中获取state：

int state = intent.getIntExtra("wifi_state", 0);

wifi热点有如下几种状态：

#WIFI_AP_STATE_DISABLED 
#WIFI_AP_STATE_DISABLING
#WIFI_AP_STATE_ENABLED
#WIFI_AP_STATE_ENABLING
#WIFI_AP_STATE_FAILED

其他API：

获取WiFI热点当前状态，返回值就是上面五种状态：

public int getWifiApState() 

判断WiFi热点是否打开：

public boolean isWifiApEnabled()

获取当前wifi热点的WifiConfiguration：

public WifiConfiguration getWifiApConfiguration()