android wifi的知识

超、凢脫俗 2022-01-16 03:46 248阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

首先,要实现一个简单的WIFI连接设置，我们需要掌握和WIFI功能相关的一些类，比如WIfiManager,WifiInfo,ScanResult,WifiConfiguration等，提供了WIFI连接相关的基本的API. 比如：  
打开关闭网关：wifiManager.setWifiEnabled(true/false);  
扫描周边网络：wifiManager.getScanResults();  
连接指定网络：wifiManager.enableNetwork(networkId,true);  
添加网络：wifiManager.addNetwork(wcg);  
移除网络：wifiManager.removeNetwork(netId);  
获取网卡状态：wifiManager.getWifiState()  
……  
2 扫描的网络将会被保存在一个List<ScanResult>中,同时WifiManager会为我们维护一个List<WifiConfiguration>，这个List中保存了我们已经连接过的配置好的网络连接.  
当我们选择一个网络时，判断它是否存在于这个List中，存在即可直接连接，否则需要用户输入密码创建一个新的WifiConfiguration.  
3 获得的ScanResult中将会保存有该无线连接的相关信息，包括SSID,BSSID,capabilities,level等属性，其中SSID号是该连接的一个标识符，比如我们经常看到的TP\_LINKXXX.  
capabilities中保存了相关加密信息，比如WEB和WPA等.level则表示信号度.  
4 在获取连接状态时，即调用wifiManager.getWifiState()或者wifiInfo.getSupplicantState()时，通常在用户已经授权成功后，我们获得的状态值就为COMPLETED，此时不管网络是否已经连接成功，我们都无法获得新的状态. 所以要判断WIFI网络是否已经真的连接成功需要用到如下方法判断：

[?][Link 1]

代码片段，双击复制

5 获取本地IP地址的方法：

[?][Link 1]

代码片段，双击复制

6 在创建一个新的WifiConfiguration时，切记SSID和preSharedKey必须添加双引号，否则必将会导致连接失败.正确写法如下：

[?][Link 1]

代码片段，双击复制

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    </div> </td> 
   <td style="vertical-align:baseline;"> 
    <div> 
     <div>
       //创建一个新的WifiConfiguration 
     </div> 
     <div>
       WifiConfiguration wcg =newWifiConfiguration(); 
     </div> 
     <div>
       wcg.BSSID = mBSSID; 
     </div> 
     <div>
       //SSID和preSharedKey必须添加双引号，否则将会导致连接失败 
     </div> 
     <div>
       wcg.SSID ="\""+ mSSID +"\""; 
     </div> 
     <div>
       wcg.hiddenSSID =false; 
     </div> 
     <div>
       wcg.status = WifiConfiguration.Status.ENABLED; 
     </div> 
     <div>
       wcg.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN); 
     </div> 
     <div>
       wcg.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED); 
     </div> 
     <div>
       wcg.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); 
     </div> 
     <div>
       wcg.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); 
     </div> 
     <div>
       wcg.allowedProtocols.set(WifiConfiguration.Protocol.RSN); 
     </div> 
     <div>
       wcg.allowedProtocols.set(WifiConfiguration.Protocol.WPA); 
     </div> 
     <div>
       //如果加密模式为WEP 
     </div> 
     <div>
       if(mSecurity.equals("WEP")) 
     </div> 
     <div>
       { 
     </div> 
     <div>
       &nbsp;&nbsp;&nbsp;wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); 
     </div> 
     <div>
       &nbsp;&nbsp;&nbsp;wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40); 
     </div> 
     <div>
       &nbsp;&nbsp;&nbsp;wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104); 
     </div> 
     <div>
       &nbsp;&nbsp;&nbsp;wcg.wepKeys[0] ="\""+ editText.getText().toString() +"\"";//This is the WEP Password 
     </div> 
     <div>
       &nbsp;&nbsp;&nbsp;wcg.wepTxKeyIndex =0; 
     </div> 
     <div>
       } 
     </div> 
     <div>
       //如果加密模式为WPA EPA 
     </div> 
     <div>
       elseif(mSecurity.equals("WPA EAP")) 
     </div> 
     <div>
       { 
     </div> 
     <div>
       wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_EAP); 
     </div> 
     <div>
       wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); 
     </div> 
     <div>
       wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); 
     </div> 
     <div>
       wcg.preSharedKey ="\""+ editText.getText().toString() +"\""; 
     </div> 
     <div>
       } 
     </div> 
     <div>
       //如果加密模式为WPA PSK 
     </div> 
     <div>
       elseif(mSecurity.equals("WPA PSK")) 
     </div> 
     <div>
       { 
     </div> 
     <div>
       wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); 
     </div> 
     <div>
       wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); 
     </div> 
     <div>
       wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); 
     </div> 
     <div>
       wcg.preSharedKey ="\""+ editText.getText().toString() +"\""; 
     </div> 
     <div>
       } 
     </div> 
     <div>
       //无加密 
     </div> 
     <div>
       else 
     </div> 
     <div>
       { 
     </div> 
     <div>
       wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); 
     </div> 
     <div>
       } 首先,要实现一个简单的WIFI连接设置，我们需要掌握和WIFI功能相关的一些类，比如WIfiManager,WifiInfo,ScanResult,WifiConfiguration等，提供了WIFI连接相关的基本的API. 比如： 
     </div> 打开关闭网关：wifiManager.setWifiEnabled(true/false); 
     <br> 扫描周边网络：wifiManager.getScanResults(); 
     <br> 连接指定网络：wifiManager.enableNetwork(networkId,true); 
     <br> 添加网络：wifiManager.addNetwork(wcg); 
     <br> 移除网络：wifiManager.removeNetwork(netId); 
     <br> 获取网卡状态：wifiManager.getWifiState() 
     <br> …… 
     <br> 2 扫描的网络将会被保存在一个List&lt;ScanResult&gt;中,同时WifiManager会为我们维护一个List&lt;WifiConfiguration&gt;，这个List中保存了我们已经连接过的配置好的网络连接. 
     <br> 当我们选择一个网络时，判断它是否存在于这个List中，存在即可直接连接，否则需要用户输入密码创建一个新的WifiConfiguration. 
     <br> 3 获得的ScanResult中将会保存有该无线连接的相关信息，包括SSID,BSSID,capabilities,level等属性，其中SSID号是该连接的一个标识符，比如我们经常看到的TP_LINKXXX. 
     <br> capabilities中保存了相关加密信息，比如WEB和WPA等.level则表示信号度. 
     <br> 4 在获取连接状态时，即调用wifiManager.getWifiState()或者wifiInfo.getSupplicantState()时，通常在用户已经授权成功后，我们获得的状态值就为COMPLETED，此时不管网络是否已经连接成功，我们都无法获得新的状态. 所以要判断WIFI网络是否已经真的连接成功需要用到如下方法判断： 
     <br> 
     <br> 
     <br> 
     <div> 
      <div> 
       <div> 
        <a href="http://www.eoeandroid.com/#" rel="nofollow">?</a> 
       </div> 代码片段，双击复制 
       <table style="text-align:left;font-size:12px;"> 
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          <td style="vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;"> 
           <div> 
            <div>
              ConnectivityManager connManager = (ConnectivityManager) WifiConnection.this 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;.getSystemService(CONNECTIVITY_SERVICE); 
            </div> 
            <div>
              // 获取代表联网状态的NetWorkInfo对象 
            </div> 
            <div>
              NetworkInfo networkInfo = connManager.getActiveNetworkInfo(); 
            </div> 
            <div>
              &nbsp; 
            </div> 
            <div>
              if(networkInfo !=null&amp;&amp; networkInfo.getType() ==1 
            </div> 
            <div>
              &amp;&amp; wifiAdmin.getWifiInfo().getSSID()!=null) 
            </div> 
            <div>
              { 
            </div> 
            <div>
              &nbsp; 
            </div> 
            <div>
              &nbsp; 
            </div> 
            <div>
              //WIFI网络连接成功 
            </div> 
            <div>
              &nbsp; 
            </div> 
            <div>
              } 
            </div> 
           </div> </td> 
         </tr> 
        </tbody> 
       </table> 
      </div> 
     </div> 
     <br> 
     <br> 
     <br> 
     <span style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;line-height:1.1em;color:#444444;font-size:14px;">5 获取本地IP地址的方法：</span> 
     <br> 
     <br> 
     <div> 
      <div> 
       <div> 
        <a href="http://www.eoeandroid.com/#" rel="nofollow">?</a> 
       </div> 代码片段，双击复制 
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          <td style="vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;"> 
           <div> 
            <div>
              publicString getLocalIpAddress() {&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;try{&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;for(Enumeration&lt;NetworkInterface&gt; en = NetworkInterface&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;.getNetworkInterfaces(); en.hasMoreElements();) {&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;NetworkInterface intf = en.nextElement();&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;for(Enumeration&lt;InetAddress&gt; enumIpAddr = intf&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;.getInetAddresses(); enumIpAddr.hasMoreElements();) {&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;InetAddress inetAddress = enumIpAddr.nextElement();&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;if(!inetAddress.isLoopbackAddress()) {&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;returninetAddress.getHostAddress().toString();&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;}&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;}&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;}&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;}catch(SocketException ex) {&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Log.e("WifiPreference IpAddress", ex.toString());&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;}&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;returnnull;&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;}&nbsp; &nbsp;&nbsp;&nbsp; 
            </div> 
           </div> </td> 
         </tr> 
        </tbody> 
       </table> 
      </div> 
     </div> 
     <br> 
     <br> 
     <span style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;line-height:1.1em;color:#444444;font-size:14px;">6 在创建一个新的WifiConfiguration时，切记SSID和preSharedKey必须添加双引号，否则必将会导致连接失败.正确写法如下：</span> 
     <br> 
     <div> 
      <div> 
       <div> 
        <a href="http://www.eoeandroid.com/#" rel="nofollow">?</a> 
       </div> 代码片段，双击复制 
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           </div> </td> 
          <td style="vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;"> 
           <div> 
            <div>
              //创建一个新的WifiConfiguration 
            </div> 
            <div>
              WifiConfiguration wcg =newWifiConfiguration(); 
            </div> 
            <div>
              wcg.BSSID = mBSSID; 
            </div> 
            <div>
              //SSID和preSharedKey必须添加双引号，否则将会导致连接失败 
            </div> 
            <div>
              wcg.SSID ="\""+ mSSID +"\""; 
            </div> 
            <div>
              wcg.hiddenSSID =false; 
            </div> 
            <div>
              wcg.status = WifiConfiguration.Status.ENABLED; 
            </div> 
            <div>
              wcg.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN); 
            </div> 
            <div>
              wcg.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED); 
            </div> 
            <div>
              wcg.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); 
            </div> 
            <div>
              wcg.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); 
            </div> 
            <div>
              wcg.allowedProtocols.set(WifiConfiguration.Protocol.RSN); 
            </div> 
            <div>
              wcg.allowedProtocols.set(WifiConfiguration.Protocol.WPA); 
            </div> 
            <div>
              //如果加密模式为WEP 
            </div> 
            <div>
              if(mSecurity.equals("WEP")) 
            </div> 
            <div>
              { 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40); 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104); 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;wcg.wepKeys[0] ="\""+ editText.getText().toString() +"\"";//This is the WEP Password 
            </div> 
            <div>
              &nbsp;&nbsp;&nbsp;wcg.wepTxKeyIndex =0; 
            </div> 
            <div>
              } 
            </div> 
            <div>
              //如果加密模式为WPA EPA 
            </div> 
            <div>
              elseif(mSecurity.equals("WPA EAP")) 
            </div> 
            <div>
              { 
            </div> 
            <div>
              wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_EAP); 
            </div> 
            <div>
              wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); 
            </div> 
            <div>
              wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); 
            </div> 
            <div>
              wcg.preSharedKey ="\""+ editText.getText().toString() +"\""; 
            </div> 
            <div>
              } 
            </div> 
            <div>
              //如果加密模式为WPA PSK 
            </div> 
            <div>
              elseif(mSecurity.equals("WPA PSK")) 
            </div> 
            <div>
              { 
            </div> 
            <div>
              wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); 
            </div> 
            <div>
              wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); 
            </div> 
            <div>
              wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); 
            </div> 
            <div>
              wcg.preSharedKey ="\""+ editText.getText().toString() +"\""; 
            </div> 
            <div>
              } 
            </div> 
            <div>
              //无加密 
            </div> 
            <div>
              else 
            </div> 
            <div>
              { 
            </div> 
            <div>
              wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); 
            </div> 
            <div>
              } 
            </div> 
           </div> </td> 
         </tr> 
        </tbody> 
       </table> 
      </div> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

转载于:https://my.oschina.net/u/994235/blog/119510

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220114/0904bb9cdeed4357bcdaf9e2b92f3e03.png
[Link 1]: http://www.eoeandroid.com/#