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最近在做Wifi连接的功能，在网上查找了很多资料，可用的也比较少，最后遇到很多了问题，一路走来也解决了很多问题，特此记录。

8.0Wifi无法扫描

• 6.0版本中如果未开启GPS是无法获取到扫描列表
• 需要动态申请ACCESS_COARSE_LOCATION权限

解决Android6.0以上扫描WIFI获得列表为空

WifiManager的getScanResults()返回列表为0

Android6.0 扫描WiFi列表的问题

Wifi的加密方式

Wifi加密方式有很多种方式：

    static final int SECURITY_NONE = 0;
    static final int SECURITY_WEP = 1;
    static final int SECURITY_PSK = 2;
    static final int SECURITY_EAP = 3;

    private int getType(ScanResult result) {
        if (result == null) {
            return SECURITY_NONE;
        }
        String capbility = result.capabilities;
        if (capbility == null || capbility.isEmpty()) {
            return SECURITY_NONE;
        }
        // 如果包含WAP-PSK的话，则为WAP加密方式
        if (capbility.contains("WPA-PSK") || capbility.contains("WPA2-PSK")) {
            return SECURITY_WPA;
        } else if (capbility.contains("WPA2-EAP")) {
            return SECURYTI_EAP;
        } else if (capbility.contains("WEP")) {
            return SECURITY_WEP;
        } else if (capbility.contains("ESS")) {
            // 如果是ESS则没有密码
            return SECURITY_NONE;
        }
        return SECURITY_NONE;
    }

Root下的Wifi存储位置

在有了Root权限后，可以在/data/misc/wifi/WifiConfigStore.xml中看到已经连接/保存配置的Wifi信息，包括Id和密码。

<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<WifiConfigStoreData>
<int name="Version" value="1" />
<NetworkList>
<Network>
<WifiConfiguration>
<string name="ConfigKey">SSID+WPA_EAP</string>
<string name="SSID">SSID</string>
<null name="BSSID" />
<null name="PreSharedKey" />
<null name="WEPKeys" />
<int name="WEPTxKeyIndex" value="0" />
<boolean name="HiddenSSID" value="false" />
<boolean name="RequirePMF" value="false" />
<byte-array name="AllowedKeyMgmt" num="1">0c</byte-array>
<byte-array name="AllowedProtocols" num="1">03</byte-array>
<byte-array name="AllowedAuthAlgos" num="1">01</byte-array>
<byte-array name="AllowedGroupCiphers" num="1">0f</byte-array>
<byte-array name="AllowedPairwiseCiphers" num="1">06</byte-array>
<boolean name="Shared" value="true" />
<int name="WapiPskKeyType" value="-1" />
<null name="WapiAsCert" />
<null name="WapiUserCert" />
<int name="EapSimSlot" value="-1" />
<int name="AutoJoinNetwork" value="1" />
<int name="Status" value="0" />
<null name="FQDN" />
<null name="ProviderFriendlyName" />
<null name="LinkedNetworksList" />
<null name="DefaultGwMacAddress" />
<boolean name="ValidatedInternetAccess" value="true" />
<boolean name="NoInternetAccessExpected" value="false" />
<int name="UserApproved" value="0" />
<boolean name="MeteredHint" value="false" />
<int name="MeteredOverride" value="0" />
<boolean name="UseExternalScores" value="false" />
<int name="NumAssociation" value="2" />
<int name="CreatorUid" value="1000" />
<string name="CreatorName">android.uid.system:1000</string>
<string name="CreationTime">time=10-18 20:06:33.868</string>
<int name="LastUpdateUid" value="1000" />
<string name="LastUpdateName">android.uid.system:1000</string>
<int name="LastConnectUid" value="1000" />
<boolean name="IsLegacyPasspointConfig" value="false" />
<long-array name="RoamingConsortiumOIs" num="0" />
</WifiConfiguration>
<NetworkStatus>
<string name="SelectionStatus">NETWORK_SELECTION_ENABLED</string>
<string name="DisableReason">NETWORK_SELECTION_ENABLE</string>
<null name="ConnectChoice" />
<long name="ConnectChoiceTimeStamp" value="-1" />
<boolean name="HasEverConnected" value="true" />
</NetworkStatus>
<IpConfiguration>
<string name="IpAssignment">DHCP</string>
<string name="ProxySettings">NONE</string>
</IpConfiguration>
<WifiEnterpriseConfiguration>
<string name="Identity">身份</string>
<string name="AnonIdentity"></string>
<string name="Password">密码</string>
<string name="ClientCert"></string>
<string name="CaCert"></string>
<string name="SubjectMatch"></string>
<string name="Engine">0</string>
<string name="EngineId"></string>
<string name="PrivateKeyId"></string>
<string name="AltSubjectMatch"></string>
<string name="DomSuffixMatch"></string>
<string name="CaPath"></string>
<int name="EapMethod" value="0" />
<int name="Phase2Method" value="0" />
<string name="PLMN"></string>
<string name="Realm"></string>
</WifiEnterpriseConfiguration>
</Network>
</NetworkList>
<PasspointConfigData>
<long name="ProviderIndex" value="0" />
</PasspointConfigData>
</WifiConfigStoreData>

如果需要进行Wifi连接的开发的话，则在系统的Wifi连接后，对比缺少哪些字段，在代码中进行设置即可。

在配置Wifi时，也必须要Root/System权限才能够连接

常见问题

1. 无法保存WifiEnterpriseConfiguration

原因

在EAP的连接方式中，必须在enterpriseConfig中设置EapMethod以及Phase2Method，否则系统不会将该配置保存到WifiConfigStore.xml中。

代码

config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_EAP);
// 对输入的配置设置EAP加密方式
 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
    // 设置EAP方式，如果不设置，则无法连接上该Wifi
    config.enterpriseConfig.setEapMethod(WifiEnterpriseConfig.Eap.PEAP);
    config.enterpriseConfig.setPhase2Method(WifiEnterpriseConfig.Phase2.NONE);
     // 设置身份
     config.enterpriseConfig.setIdentity(account);
     // 设置密码
      config.enterpriseConfig.setPassword(pass);
     }
    config.status = WifiConfiguration.Status.ENABLED;
  }