Android的Wifi连接

• 2019 年 10 月 29 日
• 筆記

幕后

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;    }