Android WiFi使用记录 _Android

知识的领域是无限的,我们的学习也是无限期的。这篇文章主要讲述Android WiFi使用记录相关的知识，希望能为你提供帮助。
最近在做android的WiFi部分的开发，连接的工具类参照了这个文章的工具类。
http://www.cnblogs.com/zhuqiang/p/3566686.html
开发中碰上的一些问题，在这里对一些解决办法做了些记录。
【Android WiFi使用记录】
1.对于WiFi加密方式的识别

String capabilities = scanResult.capabilities;

if (capabilities.contains("WPA") || capabilities.contains("wpa")) {
((WifiHolder) holder).setType(WifiConnector.WifiCipherType.WIFICIPHER_WPA);
} else if (capabilities.contains("WEP") || capabilities.contains("wep")) {
((WifiHolder) holder).setType(WifiConnector.WifiCipherType.WIFICIPHER_WEP);
} else {
((WifiHolder) holder).setType(WifiConnector.WifiCipherType.WIFICIPHER_NOPASS);
}

通过获取scanResult的capabilities来判断WiFi的加密方式

2.连接WiFi的成功率
开发中发现当我输入密码正确时，没能连接到我的指定wifi。目前发现原因是由于WifiManager会保存历史的WiFi配置造成了影响。

public List< WifiConfiguration> cleanWifiConfiguredNetworks(String ssid) {
List< WifiConfiguration> configuredNetworks = wifiManager
.getConfiguredNetworks();

for (int i = 0; i < configuredNetworks.size(); i++) {
wifiManager.removeNetwork(configuredNetworks.get(i).networkId);
}
return configuredNetworks;
}
很简单直接清空了历史配置或者设置其他为不可用。

3.wifi连接成功的监听
不太喜欢广播监听，各种问题很多，我直接对当前连接wifi信息进行判断。
先通过wifiManager.getConnectionInfo() 获取当前的连接WiFi信息，

connectionInfo.getSSID().contains(ssid) ||
connectionInfo.getSupplicantState() != SupplicantState.COMPLETED

再判断wifi的ssid以及wifimanager的状态，两条件都满足时则WiFi连接成功。
项目需求我这接下来要进行socket通信，这种状态下获取的IP地址存在延迟增加了新的条件判断，对于wifiinfo中的MeteredHint参数额外的判断。当这变为true
时，获取了正确IP。这个参数获取方法给hide，不能调用需反射才能成功使用代码如下：

//通过反射方法调用hide方法
public boolean getWifiInfoHint(WifiInfo connectionInfo) throws InstantiationException {
Class aClass = connectionInfo.getClass();
try {
Method getMeteredHint = aClass.getDeclaredMethod("getMeteredHint");
getMeteredHint.setAccessible(true);
Object invoke = getMeteredHint.invoke(connectionInfo);
return (boolean) invoke;
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return false;
}

获取服务器的IP地址方法：
DhcpInfo info = wifiManage.getDhcpInfo();
String serverAddress = intToIp(info.serverAddress);

// 将获取的int转为真正的ip地址,参考的网上的，修改了下
private String intToIp(int i) {
return (i & 0xFF) + "." + ((i > > 8) & 0xFF) + "." + ((i > > 16) & 0xFF) + "." + ((i > > 24) & 0xFF);
}

OK 结束修改过后的全部代码如下：

package com.dopool.usersystem.hotspot;

import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.SupplicantState;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiConfiguration.AuthAlgorithm;
import android.net.wifi.WifiConfiguration.KeyMgmt;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.Log;

import com.dopool.usersystem.Constant;
import com.zhy.http.okhttp.utils.L;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

public class WifiConnector {
public Handler mHandler;
WifiManager wifiManager;

/**
* 向UI发送消息
*
* @param info 消息
*/
public void sendMsg(String info) {
if (mHandler != null) {
Message msg = new Message();
msg.obj = info;
mHandler.sendMessage(msg); // 向Handler发送消息
} else {
Log.e("wifi", info);
}
}

//WIFICIPHER_WEP是WEP ，WIFICIPHER_WPA是WPA，WIFICIPHER_NOPASS没有密码
public enum WifiCipherType {
WIFICIPHER_WEP, WIFICIPHER_WPA, WIFICIPHER_NOPASS, WIFICIPHER_INVALID
}

// 构造函数
public WifiConnector(Context context) {
// 取得WifiManager对象
this.wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
}

// 提供一个外部接口，传入要连接的无线网
public void connect(String ssid, String password, WifiCipherType type) {
Thread thread = new Thread(new ConnectRunnable(ssid, password, type));
thread.start();
}

// 查看以前是否也配置过这个网络
private WifiConfiguration isExsits(String SSID) {
List< WifiConfiguration> existingConfigs = wifiManager
.getConfiguredNetworks();
for (WifiConfiguration existingConfig : existingConfigs) {
if (existingConfig.SSID.equals("\\"" + SSID + "\\"")) {
return existingConfig;
}
}
return null;
}

private WifiConfiguration createWifiInfo(String SSID, String Password,
WifiCipherType Type) {
WifiConfiguration config = new WifiConfiguration();
config.allowedAuthAlgorithms.clear();
config.allowedGroupCiphers.clear();
config.allowedKeyManagement.clear();
config.allowedPairwiseCiphers.clear();
config.allowedProtocols.clear();
config.SSID = "\\"" + SSID + "\\"";
// nopass
if (Type == WifiCipherType.WIFICIPHER_NOPASS) {
config.allowedKeyManagement.set(KeyMgmt.NONE);
}
// wep
if (Type == WifiCipherType.WIFICIPHER_WEP) {
if (!TextUtils.isEmpty(Password)) {
if (isHexWepKey(Password)) {
config.wepKeys[0] = Password;
} else {
config.wepKeys[0] = "\\"" + Password + "\\"";
}
}
config.allowedAuthAlgorithms.set(AuthAlgorithm.OPEN);
config.allowedAuthAlgorithms.set(AuthAlgorithm.SHARED);
config.allowedKeyManagement.set(KeyMgmt.NONE);
config.wepTxKeyIndex = 0;
}
// wpa
if (Type == WifiCipherType.WIFICIPHER_WPA) {
config.preSharedKey = "\\"" + Password + "\\"";
config.hiddenSSID = true;
config.allowedAuthAlgorithms
.set(AuthAlgorithm.OPEN);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
config.allowedKeyManagement.set(KeyMgmt.WPA_PSK);
config.allowedPairwiseCiphers
.set(WifiConfiguration.PairwiseCipher.TKIP);
// 此处需要修改否则不能自动重联
// config.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
config.allowedPairwiseCiphers
.set(WifiConfiguration.PairwiseCipher.CCMP);
config.status = WifiConfiguration.Status.ENABLED;
}
return config;
}

// 打开wifi功能
private boolean openWifi() {
boolean bRet = true;
if (!wifiManager.isWifiEnabled()) {
bRet = wifiManager.setWifiEnabled(true);
}
return bRet;
}

private boolean closeifi() {
boolean bRet = true;
if (wifiManager.isWifiEnabled()) {
bRet = wifiManager.setWifiEnabled(false);
}
return bRet;
}

class ConnectRunnable implements Runnable {
private String ssid;

private String password;

private WifiCipherType type;

public ConnectRunnable(String ssid, String password, WifiCipherType type) {
this.ssid = ssid;
this.password = password;
this.type = type;
}

@Override
public void run() {
try {
// 打开wifi
openWifi();
sendMsg("opened");
Thread.sleep(200);
// 开启wifi功能需要一段时间(我在手机上测试一般需要1-3秒左右)，所以要等到wifi
// 状态变成WIFI_STATE_ENABLED的时候才能执行下面的语句
while (wifiManager.getWifiState() == WifiManager.WIFI_STATE_ENABLING) {
try {
// 为了避免程序一直while循环，让它睡个100毫秒检测……
Thread.sleep(100);
} catch (InterruptedException ie) {
}
}

//去掉以往的WiFi配置
List< WifiConfiguration> saveConfigureNetworks = cleanWifiConfiguredNetworks(ssid);

WifiConfiguration wifiConfig = createWifiInfo(ssid, password,
type);

if (wifiConfig == null) {
sendMsg("wifiConfig is null!");
return;
}

int netID = wifiManager.addNetwork(wifiConfig);
boolean enabled = wifiManager.enableNetwork(netID, true);
boolean connected = wifiManager.reconnect();

WifiInfo connectionInfo = wifiManager.getConnectionInfo();

int num = 0;
int sum = 25;
if (ssid.contains("DoPool")) {
sum = 35;
}
while (!connectionInfo.getSSID().contains(ssid) ||
connectionInfo.getSupplicantState() != SupplicantState.COMPLETED ||
ssid.contains("DoPool") ? !getWifiInfoHint(connectionInfo) : false) {
sendMsg(connectionInfo.getSSID() + "dd" + ssid + connectionInfo.getSupplicantState() + getWifiInfoHint(connectionInfo));
connectionInfo = wifiManager.getConnectionInfo();
try {
num++;
if (num == sum) {
sendMsg(ssid + "exception");
return;
}

// 为了避免程序一直while循环，让它睡个100毫秒检测……
Thread.sleep(200);
} catch (InterruptedException ie) {
}
}

for (int i = 0; i < saveConfigureNetworks.size(); i++) {
wifiManager.addNetwork(saveConfigureNetworks.get(i));
}

sendMsg(connectionInfo.toString());
sendMsg(ssid + "连接成功!");
} catch (Exception e) {
// TODO: handle exception
sendMsg(ssid + "exception");
e.printStackTrace();
}
}
}

private static boolean isHexWepKey(String wepKey) {
final int len = wepKey.length();

// WEP-40, WEP-104, and some vendors using 256-bit WEP (WEP-232?)
if (len != 10 & & len != 26 & & len != 58) {
return false;
}

return isHex(wepKey);
}

private static boolean isHex(String key) {
for (int i = key.length() - 1; i > = 0; i--) {
final char c = key.charAt(i);
if (!(c > = ‘0‘ & & c < = ‘9‘ || c > = ‘A‘ & & c < = ‘F‘ || c > = ‘a‘
& & c < = ‘f‘)) {
return false;
}
}
return true;
}

public List< WifiConfiguration> cleanWifiConfiguredNetworks(String ssid) {
List< WifiConfiguration> configuredNetworks = wifiManager
.getConfiguredNetworks();

for (int i = 0; i < configuredNetworks.size(); i++) {
wifiManager.removeNetwork(configuredNetworks.get(i).networkId);
}
return configuredNetworks;
}

ArrayList< ScanResult> list;

public List< ScanResult> getNoDopoolWifi() {
List< ScanResult> mSortWifi = getSortWifi();
//去掉带Dopool的wifi
for (int i = 0; i < mSortWifi.size(); i++) {
if (mSortWifi.get(i).SSID.contains("DoPool")) {
mSortWifi.remove(i);
}
}
return mSortWifi;
}

public List< ScanResult> getSortWifi() {

wifiManager.startScan();
list = (ArrayList< ScanResult> ) wifiManager.getScanResults();
ArrayList< ScanResult> scanResults = new ArrayList< > ();

//去掉重复的WiFi SSID的名字
for (int i = 0; i < list.size(); i++) {
if (list.get(i).SSID.equals("") || list.get(i).frequency > 3000) {
continue;
}

for (int j = 0; j < = scanResults.size(); j++) {
if (j == scanResults.size()) {
scanResults.add(list.get(i));
break;
} else if (scanResults.get(j).SSID.equals(list.get(i).SSID)) {
break;
}
}
}
//按照信号强度排序
for (int i = 0; i < scanResults.size(); i++) {
for (int j = 0; j < scanResults.size(); j++) {
if (scanResults.get(i).level > scanResults.get(j).level) {
ScanResult temp = null;
temp = scanResults.get(i);
scanResults.set(i, scanResults.get(j));
scanResults.set(j, temp);
}
}
}
return scanResults;
}

//通过反射方法调用hide方法
public boolean getWifiInfoHint(WifiInfo connectionInfo) throws InstantiationException {
Class aClass = connectionInfo.getClass();
try {
Method getMeteredHint = aClass.getDeclaredMethod("getMeteredHint");
getMeteredHint.setAccessible(true);
Object invoke = getMeteredHint.invoke(connectionInfo);
return (boolean) invoke;
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return false;
}

}