Android wifi学习Demo

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wifi工具类wifiadmin.java

package com.example.acer.tcpclient.com.example.acer.util;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.util.Log;import java.util.List;/** * Created by acer on 16-10-21. */public class WifiAdmin {    private static final String TAG = "WifiAdmin";    // 定义WifiManager对象    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    WifiManager.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);        }    }    // 关闭WIFI    public void closeWifi() {        if (mWifiManager.isWifiEnabled()) {            mWifiManager.setWifiEnabled(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);    }    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) {        int wcgID = mWifiManager.addNetwork(wcg);        boolean b =  mWifiManager.enableNetwork(wcgID, true);        Log.i(TAG, "Connect " + (b == true ? "true" : "false"));        Log.i(TAG, "configid : " + wcgID);    }    // 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，只验证过没有密码的情况：    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)        {            if (existingConfig.SSID.equals("\""+SSID+"\""))            {                return existingConfig;            }        }        return null;    }}//分为三种情况：1没有密码2用wep加密3用wpa加密

这个Demo有个小问题，CreateWifiInfo的时候，会从扫描得到的wifilist中判断指定的SSID是否存在，但是这个wifilist只有在广播的Receive中才可以得到结果，这里wifilist经常为空，导致报空指针异常，为了方便，我把判断SSID是否存在屏蔽掉了

连接指定WiFi的时候只需要调用

wifiAdmin = new WifiAdmin(this);wifiAdmin.openWifi();wifiAdmin.addNetwork(wifiAdmin.CreateWifiInfo("XXX", "XXX", 3));

需要添加的权限如下

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

本文转载自

blog.csdn.net/sasoritattoo/article/details/8285926

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