Android WiFi/WiFi热点开发总结

首先看一下WiFi的自我介绍：

Wi-Fi是一种允许电子设备连接到一个无线局域网（WLAN）的技术，通常使用2.4G UHF或5G SHF ISM 射频频段。连接到无线局域网通常是有密码保护的；但也可是开放的，这样就允许任何在WLAN范围内的设备可以连接上。

wifi可以说是Android开发中非常重要的一部分了，这里用到了一个WifiAdmin工具类。

public class WifiAdmin {
public static final String SSID = "test";
public static final String PassWord = "12345678";
private WifiManager mWifiManager;
// 定义WifiInfo对象
private WifiInfo mWifiInfo;
// 扫描出的网络连接列表
private List<ScanResult> mWifiList;
// 网络连接列表
private List<WifiConfiguration> mWifiConfiguration;
// 定义一个WifiLock
WifiLock mWifiLock;

// 构造器
public WifiAdmin(Context context) {
// 取得WifiManager对象
mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
// 取得WifiInfo对象
mWifiInfo = mWifiManager.getConnectionInfo();
}

// 打开WIFI
public void openWifi() {
if (!mWifiManager.isWifiEnabled()) {
mWifiManager.setWifiEnabled(true);
//开始扫描WIFI
startScan();
}
}

// 关闭WIFI
public void closeWifi() {
if (mWifiManager.isWifiEnabled()) {
mWifiManager.setWifiEnabled(false);
}

//创建热点
public void createAp() {
if (mWifiManager.isWifiEnabled()) {
mWifiManager.setWifiEnabled(false);
}
try {
WifiConfiguration apConfiguration = new WifiConfiguration();
apConfiguration.SSID = WifiAdmin.SSID;
apConfiguration.preSharedKey = WifiAdmin.PassWord;
apConfiguration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
Method method = mWifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
method.invoke(mWifiManager, apConfiguration, true);
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 关闭WiFi热点
*/
public void closeWifiAp() {
if (isWifiApEnabled()) {
try {
Method method = mWifiManager.getClass().getMethod("getWifiApConfiguration");
method.setAccessible(true);
WifiConfiguration config = (WifiConfiguration) method.invoke(mWifiManager);
Method method2 = mWifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
method2.invoke(mWifiManager, config, false);
} catch (Exception e) {
e.printStackTrace();
}
}
}

/**
* 热点开关是否打开
*
* @return
*/
public boolean isWifiApEnabled() {
try {
Method method = mWifiManager.getClass().getMethod("isWifiApEnabled");
method.setAccessible(true);
return (Boolean) method.invoke(mWifiManager);
} catch (Exception e) {
e.printStackTrace();
}
return false;
}

// 检查当前WIFI状态
public int checkState() {
return mWifiManager.getWifiState();
}

// 锁定WifiLock
public void acquireWifiLock() {
mWifiLock.acquire();
}

// 解锁WifiLock
public void releaseWifiLock() {
// 判断时候锁定
if (mWifiLock.isHeld()) {
mWifiLock.acquire();
}
}

// 创建一个WifiLock
public void creatWifiLock() {
mWifiLock = mWifiManager.createWifiLock("Test");
}

// 得到配置好的网络
public List<WifiConfiguration> getConfiguration() {
return mWifiConfiguration;
}

// 指定配置好的网络进行连接
public void connectConfiguration(int index) {
// 索引大于配置好的网络索引返回
if (index > mWifiConfiguration.size()) {
return;
}
// 连接配置好的指定ID的网络
mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId, true);
}

/**
* 扫描WIFI
*/
public void startScan() {
mWifiManager.startScan();
// 得到扫描结果
mWifiList = mWifiManager.getScanResults();
// 得到配置好的网络连接
mWifiConfiguration = mWifiManager.getConfiguredNetworks();
}

// 得到网络列表
public List<ScanResult> getWifiList() {
return mWifiList;
}

// 查看扫描结果
public StringBuilder lookUpScan() {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < mWifiList.size(); i++) {
stringBuilder.append("Index_" + new Integer(i + 1).toString() + ":");
// 将ScanResult信息转换成一个字符串包
// 其中把包括：BSSID、SSID、capabilities、frequency、level
stringBuilder.append((mWifiList.get(i)).toString());
stringBuilder.append("/n");
}
return stringBuilder;
}

// 得到MAC地址
public String getMacAddress() {
return (mWifiInfo == null) ? "NULL" : mWifiInfo.getMacAddress();
}

// 得到接入点的BSSID
public String getBSSID() {
return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID();
}

// 得到IP地址
public int getIPAddress() {
return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress();
}

// 得到连接的ID
public int getNetworkId() {
return (mWifiInfo == null) ? 0 : mWifiInfo.getNetworkId();
}

// 得到WifiInfo的所有信息包
public String getWifiInfo() {
return (mWifiInfo == null) ? "NULL" : mWifiInfo.toString();
}

// 添加一个网络并连接
public void addNetwork(WifiConfiguration wcg) {
Log.d("TAG", "进行添加网络：");
int wcgID = mWifiManager.addNetwork(wcg);
boolean b = mWifiManager.enableNetwork(wcgID, true);
Log.d("TAG", "b--" + b);
}

// 断开指定ID的网络
public void disconnectWifi(int netId) {
mWifiManager.disableNetwork(netId);
mWifiManager.disconnect();
}

// 然后是一个实际应用方法
public WifiConfiguration CreateWifiInfo(String SSID, String Password, int Type) {
WifiConfiguration config = new WifiConfiguration();
config.allowedAuthAlgorithms.clear();
config.allowedGroupCiphers.clear();
config.allowedKeyManagement.clear();
config.allowedPairwiseCiphers.clear();
config.allowedProtocols.clear();

//如果设备大于6.0配置的时候就不需要双引号，加了就连接不上了
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
config.SSID = SSID;
} else {
config.SSID = "\"" + SSID + "\"";
}
WifiConfiguration tempConfig = this.IsExsits(SSID);
if (tempConfig != null) {
mWifiManager.removeNetwork(tempConfig.networkId);
}
if (Type == 1) {// WIFICIPHER_NOPASS
config.wepKeys[0] = "";
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
config.wepTxKeyIndex = 0;
}
if (Type == 2) {// WIFICIPHER_WEP
config.hiddenSSID = true;
config.wepKeys[0] = "\"" + Password + "\"";
config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
config.wepTxKeyIndex = 0;
}
if (Type == 3) { // WIFICIPHER_WPA
config.preSharedKey = "\"" + Password + "\"";
config.hiddenSSID = true;
config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
config.status = WifiConfiguration.Status.ENABLED;
}

return config;
}

/**
* ip转换
*
* @param i
* @return
*/
public static String intToIp(int i) {
return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF) + "." + ((i >> 24) & 0xFF);
}

private WifiConfiguration IsExsits(String SSID) {
List<WifiConfiguration> existingConfigs = mWifiManager.getConfiguredNetworks();
if (existingConfigs != null) {
for (WifiConfiguration existingConfig : existingConfigs) {
if (existingConfig.SSID.equals("\"" + SSID + "\"")) {
Log.d("TAG", "拿到了相同配置对象：" + existingConfig.SSID);
return existingConfig;
}
}
}
return null;
}
}

初始化工具类

//首先需要获取到wifi管理者，初始化工具类
WifiAdmin wifiAdmin = new WifiAdmin(this);

// 工具类初始化
public WifiAdmin(Context context) {
// 取得WifiManager对象
mWifiManager = (WifiManager) context
.getSystemService(Context.WIFI_SERVICE);
// 取得WifiInfo对象
mWifiInfo = mWifiManager.getConnectionInfo();
}

开启wifi

//打开wifi
wifiAdmin.openWifi()；

连接热点

//连接热点之前我们需要先扫描周围热点
public void connect() {
wifiAdmin.startScan();
new Thread(new Runnable() {
@Override
public void run() {
wifiAdmin.addNetwork(wifiAdmin.CreateWifiInfo(WifiAdmin.SSID, WifiAdmin.PassWord, 3));
}
}).start();

}

关闭Wifi

wifiAdmin.closeWifi();

创建热点

wifiAdmin.createAp();

关闭热点

wifiAdmin.closeWifiAp();

对于Wifi和Wifi热点的基本使用就这些，重点都在WifiAdmin工具类中，下面在来说说如何使用广播来监听他们的状态改变。

注册广播监听WIFI连接状态改变

1 . 需要的权限

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

2 . 注册广播

<receiver android name=".WifiReceiver">
<intent-filter>
<action android:name="android.net.wifi.RSSI_CHANGED" />
<action android:name="android.net.wifi.STATE_CHANGE" />
<action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
</intent-filter>
</receiver>

3 . 广播接收者

public class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
NetworkInfo info =intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
if (info.getState().equals(NetworkInfo.State.DISCONNECTED)) {
/**
* wifi断开连接
*/
} else if (info.getState().equals(NetworkInfo.State.CONNECTED)) {
WifiManager wifiManager=(WifiManager)context.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
/**
* wifi以连接wifiInfo.getSSID();获取连接的wifi名称
*/
Log.d("TAG",wifiInfo.getSSID());
}
}else if(intent.getAction().equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {//wifi打开与否
int wifistate = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_DISABLED);
if (wifistate == WifiManager.WIFI_STATE_DISABLED) {
/**
* 系统关闭wifi
*/
} else if (wifistate == WifiManager.WIFI_STATE_ENABLED) {
/**
* 系统开启wifi
*/
}
}
}
}

以上就是根据广播接受者来获取WIFI的状态，下面在来说说监听WIFI热点的状态

广播注册(需要注意的是这个Action自动提示里根本就找不到，貌似是被隐藏了起来)

<receiver android:name="com.qdzn.home.wifi.WifiApReceiver">
<intent-filter>
<action android:name="android.net.wifi.WIFI_AP_STATE_CHANGED" />
</intent-filter>
</receiver>

2 . 广播接收者

public class WifiApReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if ("android.net.wifi.WIFI_AP_STATE_CHANGED".equals(action)) {
//便携式热点的状态为：10---正在关闭；11---已关闭；12---正在开启；13---已开启
int state = intent.getIntExtra("wifi_state", 0);
Log.d("TAG", state + "---");
}
}
}

以上就是使用广播接收者来获取WIFI和WIFI热点的状态，博客记录开发学习过程中的点点滴滴……