首先看一下WiFi的自我介紹:
Wi-Fi是一種允許電子設備連接到一個無線局域網(WLAN)的技術,通常使用2.4G UHF或5G SHF ISM 射頻頻段。連接到無線局域網通常是有密碼保護的;但也可是開放的,這樣就允許任何在WLAN範圍內的設備可以連接上。
wifi可以說是Android開發中非常重要的一部分了,這裏用到了一個WifiAdmin工具類。
package com.qdzn.home.wifi;
import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.WifiLock;
import java.lang.reflect.Method;
import java.util.List;
/**
* wifi工具類
*/
public class WifiAdmin {
public static final String SSID = "nexus";
public static final String PassWord = "12345678";
private WifiManager mWifiManager;
// 定義WifiInfo對象
private WifiInfo mWifiInfo;
// 掃描出的網絡連接列表
private List<ScanResult> mWifiList;
// 網絡連接列表
private List<WifiConfiguration> mWifiConfiguration;
// 定義一個WifiLock
WifiLock mWifiLock;
// 構造器
public WifiAdmin(Context context) {
// 取得WifiManager對象
mWifiManager = (WifiManager) context
.getSystemService(Context.WIFI_SERVICE);
// 取得WifiInfo對象
mWifiInfo = mWifiManager.getConnectionInfo();
}
// 打開WIFI
public void openWifi() {
if (!mWifiManager.isWifiEnabled()) {
mWifiManager.setWifiEnabled(true);
//開始掃描WIFI
startScan();
}
}
// 關閉WIFI
public void closeWifi() {
if (mWifiManager.isWifiEnabled()) {
mWifiManager.setWifiEnabled(false);
}
}
//創建熱點
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();
}
}
/**
* 關閉WiFi熱點
*/
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();
}
}
}
/**
* 判斷熱點是否打開
*
* @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;
}
// 檢查當前WIFI狀態
public int checkState() {
return mWifiManager.getWifiState();
}
// 鎖定WifiLock
public void acquireWifiLock() {
mWifiLock.acquire();
}
// 解鎖WifiLock
public void releaseWifiLock() {
// 判斷時候鎖定
if (mWifiLock.isHeld()) {
mWifiLock.acquire();
}
}
// 創建一個WifiLock
public void creatWifiLock() {
mWifiLock = mWifiManager.createWifiLock("Test");
}
// 得到配置好的網絡
public List<WifiConfiguration> getConfiguration() {
return mWifiConfiguration;
}
// 指定配置好的網絡進行連接
public void connectConfiguration(int index) {
// 索引大於配置好的網絡索引返回
if (index > mWifiConfiguration.size()) {
return;
}
// 連接配置好的指定ID的網絡
mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId, true);
}
/**
* 掃描WIFI
*/
public void startScan() {
mWifiManager.startScan();
// 得到掃描結果
mWifiList = mWifiManager.getScanResults();
// 得到配置好的網絡連接
mWifiConfiguration = mWifiManager.getConfiguredNetworks();
}
// 得到網絡列表
public List<ScanResult> getWifiList() {
return mWifiList;
}
// 查看掃描結果
public StringBuilder lookUpScan() {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < mWifiList.size(); i++) {
stringBuilder
.append("Index_" + new Integer(i + 1).toString() + ":");
// 將ScanResult信息轉換成一個字符串包
// 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();
}
// 得到接入點的BSSID
public String getBSSID() {
return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID();
}
// 得到IP地址
public int getIPAddress() {
return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress();
}
// 得到連接的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();
}
// 添加一個網絡並連接
public void addNetwork(WifiConfiguration wcg) {
System.out.println("進行添加網絡:");
int wcgID = mWifiManager.addNetwork(wcg);
boolean b = mWifiManager.enableNetwork(wcgID, true);
System.out.println("b--" + b);
}
// 斷開指定ID的網絡
public void disconnectWifi(int netId) {
mWifiManager.disableNetwork(netId);
mWifiManager.disconnect();
}
// 然後是一個實際應用方法
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();
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.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
config.allowedPairwiseCiphers
.set(WifiConfiguration.PairwiseCipher.CCMP);
config.status = WifiConfiguration.Status.ENABLED;
}
return config;
}
private WifiConfiguration IsExsits(String SSID) {
List<WifiConfiguration> existingConfigs = mWifiManager
.getConfiguredNetworks();
for (WifiConfiguration existingConfig : existingConfigs) {
System.out.println(existingConfig.SSID);
if (existingConfig.SSID.equals("\"" + SSID + "\"")) {
System.out.println("拿到了相同配置對象:" + existingConfig.SSID);
return existingConfig;
}
}
return null;
}
/**
* ip地址轉換
* @param i
* @return
*/
public static String intToIp(int i) {
return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF) + "." + ((i >> 24) & 0xFF);
}
}
使用方法
1.初始化工具類
//首先需要獲取到wifi管理者,初始化工具類
WifiAdmin wifiAdmin = new WifiAdmin(this);
// 工具類初始化
public WifiAdmin(Context context) {
// 取得WifiManager對象
mWifiManager = (WifiManager) context
.getSystemService(Context.WIFI_SERVICE);
// 取得WifiInfo對象
mWifiInfo = mWifiManager.getConnectionInfo();
}
2.開啓wifi
//打開wifi
wifiAdmin.openWifi();
3.連接熱點
//連接熱點之前我們需要先掃描周圍熱點
public void connect() {
wifiAdmin.startScan();
new Thread(new Runnable() {
@Override
public void run() {
wifiAdmin.addNetwork(wifiAdmin.CreateWifiInfo(WifiAdmin.SSID, WifiAdmin.PassWord, 3));
}
}).start();
}
4.關閉Wifi
wifiAdmin.closeWifi();
5.創建熱點
wifiAdmin.createAp();
6.關閉熱點
wifiAdmin.closeWifiAp();
對於Wifi和Wifi熱點的基本使用就這些,重點都在WifiAdmin工具類中,下面在來說說如何使用廣播來監聽他們的狀態改變。
註冊廣播監聽WIFI連接狀態改變
1 . 需要的權限
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
2 . 註冊廣播
<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 . 廣播接收者
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斷開連接
*/
} else if (info.getState().equals(NetworkInfo.State.CONNECTED)) {
WifiManager wifiManager=(WifiManager)context.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
/**
* wifi以連接wifiInfo.getSSID();獲取連接的wifi名稱
*/
Log.d("TAG",wifiInfo.getSSID());
}
}else if(intent.getAction().equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {//wifi打開與否
int wifistate = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_DISABLED);
if (wifistate == WifiManager.WIFI_STATE_DISABLED) {
/**
* 系統關閉wifi
*/
} else if (wifistate == WifiManager.WIFI_STATE_ENABLED) {
/**
* 系統開啓wifi
*/
}
}
}
}
以上就是根據廣播接受者來獲取WIFI的狀態,下面在來說說監聽WIFI熱點的狀態
1.廣播註冊(需要注意的是這個Action自動提示里根本就找不到,貌似是被隱藏了起來)
<receiver android:name="com.qdzn.home.wifi.WifiApReceiver">
<intent-filter>
<action android:name="android.net.wifi.WIFI_AP_STATE_CHANGED" />
</intent-filter>
</receiver>
2 . 廣播接收者
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)) {
//便攜式熱點的狀態爲:10---正在關閉;11---已關閉;12---正在開啓;13---已開啓
int state = intent.getIntExtra("wifi_state", 0);
Log.d("TAG", state + "---");
}
}
}