Android Wifi --自动连接指定SSID（各种加密方式均可）

Android Wifi API参考网站这里写链接内容
1.开始先加入wifi权限

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

2.自动连接指定SSID实现代码
wificonnect.java


import java.util.List;
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.text.TextUtils;
import android.util.Log;public class WifiConnect {private static final String TAG = "WifiConnect";//定义WifiManager对象private  WifiManager mWifiManager;// 定义WifiInfo对象    private WifiInfo mWifiInfo;  private AccessPoint mAccessPoint;private ScanResult mresult;private Context mcontext;//构造函数public WifiConnect(Context context){mcontext = context;// 取得WifiManager对象    mWifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);   // 取得WifiInfo对象    mWifiInfo = mWifiManager.getConnectionInfo();}//打开wifi功能private boolean OpenWifi(){boolean bRet = true;if (!mWifiManager.isWifiEnabled()){bRet = mWifiManager.setWifiEnabled(true);}return bRet;}//从扫描结果中提取需要的wifiprivate boolean getScanResultsBySSID(String ssid){ List<ScanResult> list = mWifiManager.getScanResults();for (ScanResult result : list){if (TextUtils.equals(result.SSID, ssid)){mresult=result;return true;}}return false;  }//查看以前是否也配置过这个网络private WifiConfiguration IsExsits(String SSID){List<WifiConfiguration> existingConfigs = mWifiManager.getConfiguredNetworks();for (WifiConfiguration existingConfig : existingConfigs) {if (existingConfig.SSID.equals("\""+SSID+"\"")){return existingConfig;}}return null; }    //提供一个外部接口，传入要连接的无线网public boolean Connect(String SSID, String Password){if(!this.OpenWifi()){return false;}//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WifiManager.WIFI_STATE_ENABLED的时候才能执行下面的语句while( !(mWifiManager.getWifiState()==WifiManager.WIFI_STATE_ENABLED) ){try{//为了避免程序一直while循环，让它睡个100毫秒在检测……Thread.currentThread();Thread.sleep(100);}catch(InterruptedException ie){}}Log.i(TAG, "---BeginScan-SSID---");//等待扫描完wifiwhile( !getScanResultsBySSID(SSID) ){try{//为了避免程序一直while循环，让它睡个100毫秒在检测……Thread.currentThread();Thread.sleep(100);}catch(InterruptedException ie){}}Log.i(TAG, "---EndScan-SSID---");WifiConfiguration config = new WifiConfiguration();mAccessPoint = new AccessPoint(mcontext,mresult);//判断以前是否保存过此WIFI环境WifiConfiguration tempConfig = this.IsExsits(SSID);if(tempConfig != null){mWifiManager.removeNetwork(tempConfig.networkId);}config = mAccessPoint.getConfig(Password, null, null);Log.i(TAG, "----wifi--config--"+config);int netID = mWifiManager.addNetwork(config);boolean bRet = mWifiManager.enableNetwork(netID,false);if(bRet){//保持WIFI配置文件mWifiManager.saveConfiguration();}Log.i(TAG, "------WifiConnectState---"+bRet);return bRet;}}

AccessPoint.java 此文件是从Android Setting 源码中提取出来的

package com.example.wifihotinterface;import static android.net.wifi.WifiConfiguration.INVALID_NETWORK_ID;
import android.content.Context;
import android.net.LinkProperties;
import android.net.NetworkInfo.DetailedState;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiConfiguration.AuthAlgorithm;
import android.net.wifi.WifiConfiguration.IpAssignment;
import android.net.wifi.WifiConfiguration.KeyMgmt;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.preference.Preference;
import android.security.Credentials;
import android.text.TextUtils;
import android.util.Log;
import com.example.wifihotinterface.R;public class AccessPoint extends Preference {static final String TAG = "Settings.AccessPoint";private static final String KEY_DETAILEDSTATE = "key_detailedstate";private static final String KEY_WIFIINFO = "key_wifiinfo";private static final String KEY_SCANRESULT = "key_scanresult";private static final String KEY_CONFIG = "key_config";private static final String KEYSTORE_SPACE = WifiConfiguration.KEYSTORE_URI;/** These values are matched in string arrays -- changes must be kept in sync */static final int SECURITY_NONE = 0;static final int SECURITY_WEP = 1;static final int SECURITY_PSK = 2;static final int SECURITY_EAP = 3;enum PskType {UNKNOWN,WPA,WPA2,WPA_WPA2}String ssid;String bssid;int security;int networkId;boolean wpsAvailable = false;PskType pskType = PskType.UNKNOWN;private WifiConfiguration mConfig;/* package */ScanResult mScanResult;private int mRssi;private WifiInfo mInfo;private DetailedState mState;static int getSecurity(WifiConfiguration config) {if (config.allowedKeyManagement.get(KeyMgmt.WPA_PSK)) {return SECURITY_PSK;}if (config.allowedKeyManagement.get(KeyMgmt.WPA_EAP) ||config.allowedKeyManagement.get(KeyMgmt.IEEE8021X)) {return SECURITY_EAP;}return (config.wepKeys[0] != null) ? SECURITY_WEP : SECURITY_NONE;}private static int getSecurity(ScanResult result) {if (result.capabilities.contains("WEP")) {return SECURITY_WEP;} else if (result.capabilities.contains("PSK")) {return SECURITY_PSK;} else if (result.capabilities.contains("EAP")) {return SECURITY_EAP;}return SECURITY_NONE;}public boolean isLock() {return security != SECURITY_NONE;}private static PskType getPskType(ScanResult result) {boolean wpa = result.capabilities.contains("WPA-PSK");boolean wpa2 = result.capabilities.contains("WPA2-PSK");if (wpa2 && wpa) {return PskType.WPA_WPA2;} else if (wpa2) {return PskType.WPA2;} else if (wpa) {return PskType.WPA;} else {Log.w(TAG, "Received abnormal flag string: " + result.capabilities);return PskType.UNKNOWN;}}AccessPoint(Context context, WifiConfiguration config) {super(context);loadConfig(config);}AccessPoint(Context context, ScanResult result) {super(context);loadResult(result);}public void saveWifiState(Bundle savedState) {savedState.putParcelable(KEY_CONFIG, mConfig);savedState.putParcelable(KEY_SCANRESULT, mScanResult);savedState.putParcelable(KEY_WIFIINFO, mInfo);if (mState != null) {savedState.putString(KEY_DETAILEDSTATE, mState.toString());}}private void loadConfig(WifiConfiguration config) {ssid = (config.SSID == null ? "" : removeDoubleQuotes(config.SSID));bssid = config.BSSID;security = getSecurity(config);networkId = config.networkId;mRssi = Integer.MAX_VALUE;mConfig = config;}private void loadResult(ScanResult result) {ssid = result.SSID;bssid = result.BSSID;security = getSecurity(result);wpsAvailable = security != SECURITY_EAP && result.capabilities.contains("WPS");if (security == SECURITY_PSK)pskType = getPskType(result);networkId = -1;mRssi = result.level;mScanResult = result;}@Overridepublic int compareTo(Preference preference) {if (!(preference instanceof AccessPoint)) {return 1;}AccessPoint other = (AccessPoint) preference;// Active one goes first.if (mInfo != null && other.mInfo == null) return -1;if (mInfo == null && other.mInfo != null) return 1;// Reachable one goes before unreachable one.if (mRssi != Integer.MAX_VALUE && other.mRssi == Integer.MAX_VALUE) return -1;if (mRssi == Integer.MAX_VALUE && other.mRssi != Integer.MAX_VALUE) return 1;// Configured one goes before unconfigured one.if (networkId != WifiConfiguration.INVALID_NETWORK_ID&& other.networkId == WifiConfiguration.INVALID_NETWORK_ID) return -1;if (networkId == WifiConfiguration.INVALID_NETWORK_ID&& other.networkId != WifiConfiguration.INVALID_NETWORK_ID) return 1;// Sort by signal strength.int difference = WifiManager.compareSignalLevel(other.mRssi, mRssi);if (difference != 0) {return difference;}// Sort by ssid.return ssid.compareToIgnoreCase(other.ssid);}@Overridepublic boolean equals(Object other) {if (!(other instanceof AccessPoint)) return false;return (this.compareTo((AccessPoint) other) == 0);}@Overridepublic int hashCode() {int result = 0;if (mInfo != null) result += 13 * mInfo.hashCode();result += 19 * mRssi;result += 23 * networkId;result += 29 * ssid.hashCode();return result;}boolean update(ScanResult result) {if (ssid.equals(result.SSID) && security == getSecurity(result)) {if (WifiManager.compareSignalLevel(result.level, mRssi) > 0) {int oldLevel = getLevel();mRssi = result.level;if (getLevel() != oldLevel) {}}// This flag only comes from scans, is not easily saved in configif (security == SECURITY_PSK) {pskType = getPskType(result);}return true;}return false;}void update(WifiInfo info, DetailedState state) {if (info != null && networkId != WifiConfiguration.INVALID_NETWORK_ID&& networkId == info.getNetworkId()) {mRssi = info.getRssi();mInfo = info;mState = state;} else if (mInfo != null) {mInfo = null;mState = null;}}int getLevel() {if (mRssi == Integer.MAX_VALUE) {return -1;}return WifiManager.calculateSignalLevel(mRssi, 5);}WifiConfiguration getConfig() {return mConfig;}WifiInfo getInfo() {return mInfo;}DetailedState getState() {return mState;}static String removeDoubleQuotes(String string) {int length = string.length();if ((length > 1) && (string.charAt(0) == '"')&& (string.charAt(length - 1) == '"')) {return string.substring(1, length - 1);}return string;}static String convertToQuotedString(String string) {return "\"" + string + "\"";}/*** Generate and save a default wifiConfiguration with common values.* Can only be called for unsecured networks.* @hide*/protected void generateOpenNetworkConfig() {if (security != SECURITY_NONE)throw new IllegalStateException();if (mConfig != null)return;mConfig = new WifiConfiguration();mConfig.SSID = AccessPoint.convertToQuotedString(ssid);mConfig.allowedKeyManagement.set(KeyMgmt.NONE);}    public static boolean requireKeyStore(WifiConfiguration config) {if (config == null) {return false;}if (!TextUtils.isEmpty(config.key_id.value())) {return true;}String values[] = { config.ca_cert.value(), config.client_cert.value() };for (String value : values) {if (value != null && value.startsWith(KEYSTORE_SPACE)) {return true;}}return false;}public boolean isEqualAP(WifiInfo info) {if (info == null) {return false;}return ssid.equals(removeDoubleQuotes(info.getSSID()));}  public boolean hasValidNetworkId() {return networkId != INVALID_NETWORK_ID;}    public WifiConfiguration getConfig(String password, IpAssignment ipAssignment, LinkProperties linkProperties) {WifiConfiguration config = new WifiConfiguration();if (networkId == INVALID_NETWORK_ID) {config.SSID = AccessPoint.convertToQuotedString(ssid);} else {config.networkId = networkId;}switch (security) {case AccessPoint.SECURITY_NONE:config.allowedKeyManagement.set(KeyMgmt.NONE);break;case AccessPoint.SECURITY_WEP:config.allowedKeyManagement.set(KeyMgmt.NONE);config.allowedAuthAlgorithms.set(AuthAlgorithm.OPEN);config.allowedAuthAlgorithms.set(AuthAlgorithm.SHARED);if (password.length() != 0) {int length = password.length();// WEP-40, WEP-104, and 256-bit WEP (WEP-232?)if ((length == 10 || length == 26 || length == 58)&& password.matches("[0-9A-Fa-f]*")) {config.wepKeys[0] = password;} else {config.wepKeys[0] = '"' + password + '"';}}break;case AccessPoint.SECURITY_PSK:config.allowedKeyManagement.set(KeyMgmt.WPA_PSK);if (password.length() != 0) {if (password.matches("[0-9A-Fa-f]{64}")) {config.preSharedKey = password;} else {config.preSharedKey = '"' + password + '"';}}break;case AccessPoint.SECURITY_EAP:config.allowedKeyManagement.set(KeyMgmt.WPA_EAP);config.allowedKeyManagement.set(KeyMgmt.IEEE8021X);config.eap.setValue("");config.phase2.setValue("");config.ca_cert.setValue(Credentials.CA_CERTIFICATE);config.client_cert.setValue(Credentials.USER_CERTIFICATE);final boolean isEmptyKeyId = true;config.key_id.setValue("");config.engine.setValue(isEmptyKeyId ? WifiConfiguration.ENGINE_DISABLE: WifiConfiguration.ENGINE_ENABLE);config.engine_id.setValue(isEmptyKeyId ? "": WifiConfiguration.KEYSTORE_ENGINE_ID);config.identity.setValue("");config.anonymous_identity.setValue("");if (password.length() != 0) {config.password.setValue(password);}break;default:return null;}       if (ipAssignment != null) {config.ipAssignment = ipAssignment;}if (linkProperties != null) {config.linkProperties = new LinkProperties(linkProperties);}mConfig = config;return config;}public void invalidNetworkId() {networkId = INVALID_NETWORK_ID;}public String getStatus() {String result = "";Context context = getContext();if (mState != null) { // This is the active connectionresult = Summary.get(context, mState);} else if (mRssi == Integer.MAX_VALUE) { // Wifi out of rangeresult = context.getString(R.string.wifi_not_in_range);} else if (mConfig != null && mConfig.status == WifiConfiguration.Status.DISABLED) {switch (mConfig.disableReason) {case WifiConfiguration.DISABLED_AUTH_FAILURE:result = context.getString(R.string.wifi_disabled_password_failure);break;case WifiConfiguration.DISABLED_DHCP_FAILURE:case WifiConfiguration.DISABLED_DNS_FAILURE:result = context.getString(R.string.wifi_disabled_network_failure);break;case WifiConfiguration.DISABLED_UNKNOWN_REASON:result = context.getString(R.string.wifi_disabled_generic);}} else { // In range, not disabled.StringBuilder summary = new StringBuilder();if (mConfig != null) { // Is saved networksummary.append(context.getString(R.string.wifi_remembered));}result = summary.toString();}return result;}
}

Summary.java 此文件也是从Android Setting源码中提取

import com.example.wifihotinterface.R;
import android.content.Context;
import android.net.NetworkInfo.DetailedState;public class Summary {static String get(Context context, String ssid, DetailedState state) {String[] formats = context.getResources().getStringArray((ssid == null)? R.array.wifi_status : R.array.wifi_status_with_ssid);int index = state.ordinal();if (index >= formats.length || formats[index].length() == 0) {return null;}return String.format(formats[index], ssid);}static String get(Context context, DetailedState state) {if (state == DetailedState.VERIFYING_POOR_LINK)state = DetailedState.CONNECTED;return get(context, null, state);}
}

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