安卓工业平板电脑的WIFI怎么样使用-白红宇

安卓工业平板电脑的WIFI怎么样使用

阅读量：6213 次

发布时间：2019-06-21

本文共 9044 字，大约阅读时间需要 30 分钟。

安卓版本：4.4.2 运行平台：广州微嵌安卓工业平板

1、安卓使用wifi模块需在AndroidMainfest.xml声明权限：

允许程序改变Wi-Fi连接状态

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

允许程序访问Wi-Fi网络状态信息

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

2、获取WifiManager的实例，用于操作wifi:

wifiManager = (WifiManager)getSystemService(Service.WIFI_SERVICE);

3、打开或关闭wifi

//isChecked为true表示打开wifi,false关闭WiFi

if(!wifiManager.wifiEnable(isChecked))

{

Toast.makeText(MainActivity.this,"WifisetEnabledfaled",

Toast.LENGTH_SHORT).show();;

}

//获取WiFi当前的状态

switch(wifiManager.getWifiState())

{

//wifi处于关闭状态

case WifiManager.WIFI_STATE_DISABLED:

enableSwitch.setChecked(false);

break;

//wifi处于打开状态

case WifiManager.WIFI_STATE_ENABLED:

enableSwitch.setChecked(true);

//该方法用于开始扫描附近的wifi热点

wifiManager.startScan();

break;

}

4、注册wifi的相应广播监听wifi的状态改变：

//扫描到可用的wifi热点

WifiManager.SCAN_RESULTS_AVAILABLE_ACTION

//wifi状态改变

WifiManager.WIFI_STATE_CHANGED_ACTION

//wifi请求连接成功或失败

WifiManager.SUPPLICANT_STATE_CHANGED_ACTION

//wifi连接或断开状态改变，

ConnectivityManager.CONNECTIVITY_ACTION

//wifi热点状态改变

"android.net.wifi.WIFI_AP_STATE_CHANGED"

定义BroadcastReceiver接收广播：

class WifiReceiver extends BroadcastReceiver

{

public void onReceive(Context context, Intent intent)

{

//扫描到可用热点

if (intent.getAction().equals(

WifiManager.SCAN_RESULTS_AVAILABLE_ACTION))

{

//获取最近一次扫描到的wifi列表

resultList = wifiManager.getScanResults();

String[] result = mywifi.getString(resultList);

int i=0;

for(ScanResult scan:resultList){

//判断是否已保存了连接信息

if(mywifi.isSaveConfigtion(scan.SSID)!=null){

result[i] += ":已保存";

}

i++;

}

//wifi或热点的状态发生改变

else if(intent.getAction()

.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)||

intent.getAction()

.equals("android.net.wifi.WIFI_AP_STATE_CHANGED"))

{

//获取wifi或热点当前的状态

switch(intent.getIntExtra("wifi_state", 0)){

//wifi状态变成关闭

case 1:

adapter.clear();

stateText.setText("Wifi已关闭");

break;

//WiFi状态变成打开

case 3:

stateText.setText("Wifi已打开");

break;

//热点状态变成打开

case 13

apstateText.setText("热点已打开");

break;

//热点状态变成关闭

case 11:

apstateText.setText("热点已关闭");

break;

default:

Log.d("STATE",String.valueOf(intent.getIntExtra("wifi_state", 0)));

break;

}

//连接状态发生改变

else if(intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION))

{

boolean b = false;

//获取当前的连接状态

boolean a = intent.getBooleanExtra("noConnectivity", b);

if(!a)

{

//wifi连接成功，获取连接的wifi属性

System.out.println("连接成功");

}

else

{

//wifi已断开连接

System.out.println("断开连接");

}

//wifi连接请求成功或失败

else if(intent.getAction().equals(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION)) {

//获取连接wifi属性跟请求连接状态

WifiInfo info = wifiManager.getConnectionInfo();

SupplicantState state = info.getSupplicantState();

int flag =0;

boolean connectflag = false;

//连接请求成功

if (state == SupplicantState.COMPLETED) {

Log.i("WifiReceiver", "(验证成功)");

SSIDText.setText(info.getSSID().substring(1,info.getSSID().length()-1));

//保存连接wifi信息

wifiManager.saveConfiguration();

flag =1;

}

//获取请求失败的错误值，判断是否属于验证失败

int errorCode = intent.getIntExtra(

WifiManager.EXTRA_SUPPLICANT_ERROR, -1);

if (errorCode == WifiManager.ERROR_AUTHENTICATING) {

Log.i("WifiReceiver", "(验证失败)");

}

｝

5、在扫描到wifi后获取wifi的具体属性：

//参数：扫描到的wifi列表

public String[] getString(List<ScanResult> wifiList)

{

ArrayList<String> listStr = new ArrayList<String>();

for (int i = 0; i < wifiList.size(); i++)

{

/*SSID:wifi的标示符，也就是名字

*capabilities:描述接入点支持的身份验证、密钥管理和加密方案

*level:wifi的信号强度

*WifiManager.calculateSignalLevel:将信号强度转换成信号等级

listStr.add(scan.SSID+":"

+scan.capabilities+":"

+String.valueOf(WifiManager.calculateSignalLevel(scan.level, 5)));

}

return listStr.toArray(new String[0]);

}

6、获取当前wifi连入点的一些常用信息

WifiInfo connectInfo = wifiManager.getConnectionInfo();

//连接wifi的名字

connectInfo.getSSID();

//wifi的连接速度跟单位

connectInfo.getLinkSpeed();

connectInfo.LINK_SPEED_UNITS;

//连接wifi的ip地址

connectInfo.getIpAddress();

//用下面的转换方法将connectInfo.getIpAddress()转换成String

public String intToIp(int i) {return ((i >> 24 ) & 0xFF ) + "."

+ ((i >> 16 ) & 0xFF) + "." + ((i >> 8 ) & 0xFF) + "." + ( i & 0xFF) ; }

7、创建wifi信息用于wifi连接，分为无密码、WPA两种：

/*无密码连接:

*SSID:wifi的标识符

*config:用于wifi连接的wifi信息

String SSID = ssid;

WifiConfiguration config = new WifiConfiguration();

config.allowedAuthAlgorithms.clear();

config.allowedGroupCiphers.clear();

config.allowedKeyManagement.clear();

config.allowedPairwiseCiphers.clear();

config.allowedProtocols.clear();

config.SSID = "\"" + SSID + "\"";

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);

/*有密码连接:

*SSID:wifi的标识符

*password:wifi密码

*config:用于wifi连接的wifi信息

String gol_password = password;

WifiConfiguration config = new WifiConfiguration();

config.SSID = "\"" + ssid + "\"";

config.preSharedKey = "\"" + gol_password + "\"";

config.hiddenSSID = true;

config.status = WifiConfiguration.Status.ENABLED;

config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);

config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);

config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);

config.allowedPairwiseCiphers

.set(WifiConfiguration.PairwiseCipher.TKIP);

config.allowedPairwiseCiphers

.set(WifiConfiguration.PairwiseCipher.CCMP);

config.allowedProtocols.set(WifiConfiguration.Protocol.RSN);

//使用上面新建的WifiConfiguration config连接wifi:

int wcgID = wifiManager.addNetwork(wifiConfig);

//连接成功返回true,失败返回false

boolean flag = wifiManager.enableNetwork(wcgID, true);

8、wifi断开连接：

//SSID:wifi的标示符

public boolean disconnectWifi(String SSID)

{

List<WifiConfiguration> existingConfigs = null;

existingConfigs = wifiManager.getConfiguredNetworks();;

for (WifiConfiguration existingConfig : existingConfigs) {

if (existingConfig.SSID.equals("\"" + SSID + "\"")) {

if(wifiManager.disableNetwork(existingConfig.networkId))

{

return true;

}else break;

}

return false;

}

9、判断wifi信息是否已保存:

public WifiConfiguration isSaveConfigtion(String SSID)

{

List <WifiConfiguration> existingConfigs = null;

existingConfigs = wifiManager.getConfiguredNetworks();;

for (WifiConfiguration existingConfig : existingConfigs) {

if (existingConfig.SSID.equals("\"" + SSID + "\"")) {

return existingConfig;

}

return null;

}

10、删除保存的wifi信息:

public boolean removeWifi(String SSID)

{

List<WifiConfiguration> existingConfigs;

existingConfigs= wifiManager.getConfiguredNetworks();

for (WifiConfiguration existingConfig : existingConfigs) {

if (existingConfig.SSID.equals("\"" + SSID + "\"")) {

return wifiManager.removeNetwork(existingConfig.networkId);

}

return false;

}

至此wifi的打开、关闭、扫描、连接、断开等基本功能的开发就基本结束了，但是在日常的wifi使用中，我们不仅仅只是连接热点，有时也会开启安卓上的本地热点供其它安卓设备连接，所以下面的部分就是设置本地的wifi热点信息并打开等功能。

11、热点跟wifi不能同时使用，所以在打开热点前需先关闭掉wifi

//先判断wifi是否处于打开的状态，如果是则先关闭再打开热点

if(wifiManager.isWifiEnabled()){

wifiManager.setWifiEnabled(false);

Toast.makeText(MainActivity.this, "关闭当前wifi,创建热点", Toast.LENGTH_SHORT).show();

}

创建热点信息：分为有密码、无密码

/*无密码热点：

*SSID:热点名字

*config:热点信息

WifiConfiguration config = new WifiConfiguration();

config.SSID = ssid;

config.wepTxKeyIndex = 0;

config.wepKeys[0] = "";

config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);

config.wepTxKeyIndex = 0;

/*有密码热点:

*SSID:热点名字

*password:热点密码

*config:热点信息

config.hiddenSSID = true;

config.preSharedKey = password;

config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);

config.allowedProtocols.set(WifiConfiguration.Protocol.RSN);

config.allowedProtocols.set(WifiConfiguration.Protocol.WPA);

config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);

config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);

config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);

config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);

config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);

使用上面创建的热点信息打开热点

//config:热点信息，打开热点

Method method1 = null;

try {

method1 = wifiManager.getClass().getMethod("setWifiApEnabled",

WifiConfiguration.class, boolean.class);

method1.invoke(wifiManager, config, true);

} catch (Exception e) {

e.printStackTrace();

}

//判断热点是否处于打开状态：

try {

Method method = wifiManager.getClass().getMethod("isWifiApEnabled");

method.setAccessible(true);

return (Boolean) method.invoke(wifiManager);

} catch (NoSuchMethodException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

}

//关闭热点,先判断热点是否已被打开，是则关闭

if (isWifiApEnabled(wifiManager)) {

Method method = wifiManager.getClass().getMethod("getWifiApConfiguration");

method.setAccessible(true);

WifiConfiguration config = (WifiConfiguration) method.invoke(wifiManager);

Method method2 =wifiManager.getClass()

.getMethod("setWifiApEnabled",WifiConfiguration.class, boolean.class);

method2.invoke(wifiManager, config, false);

}

到了这里安卓的wifi使用就已完成了，包括了wifi跟热点两大部分，wifi部分主要包括扫描、配置、连接断开等，热点部分主要是配置热点信息并打开。

转载于:https://blog.51cto.com/10882116/2361775

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