Android wifi解析

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android.net.wifi 中常用的类有：

ScanResult, 主要用来描述已经检测出的接入点，包括接入点的地址、接入点的名称、身份认证、频率、信号强度等。
WifiConfiguration, wifi网络配置，包括安全配置等。
WifiInfo, Wifi无线连接的描述，包括接入点、网络连接状态、隐藏的接入点、IP地址、连接速度、MAC地址、网络ID、信号强度等。
WifiManager, 提供管理wifi连接的大部分API。
WifiManager.WifiLock, 通过WifiLock来锁定wifi网络，使其一直保持连接，直到这个锁定被释放。如果app需要下载很大的文件，就需要保持wifi锁，来确保app有足够的时间下载完成。wifi锁不能超越wifi-enabled设置，也没有飞行模式。

WifiManager提供的方法

1、开启WIFI

public void WifiOpen(){    if(!localWifiManager.isWifiEnabled()){        localWifiManager.setWifiEnabled(true);    }}

2.扫描WIFI信号

public void WifiStartScan(){    localWifiManager.startScan();}

3.得到扫描WIFI结果

public List<ScanResult> getScanResults(){    return localWifiManager.getScanResults();//得到扫描结果}

4.得到WIFi的配置好的信息，包含配置好的密码

public void getConfiguration(){    wifiConfigList = localWifiManager.getConfiguredNetworks();//得到配置好的网络信息    for(int i =0;i<wifiConfigList.size();i++){        Log.i("getConfiguration",wifiConfigList.get(i).SSID);        Log.i("getConfiguration",String.valueOf(wifiConfigList.get(i).networkId));    }}

5.根据WIFI的名称SSID判定指定WIFI是否已经配置好，配置好则返回其networkId，用于连接。之前尝试了BSSID地址没成功，所以只能使用SSID

public int IsConfiguration(String SSID){    Log.i("IsConfiguration",String.valueOf(wifiConfigList.size()));    for(int i = 0; i < wifiConfigList.size(); i++){        Log.i(wifiConfigList.get(i).SSID,String.valueOf( wifiConfigList.get(i).networkId));        if(wifiConfigList.get(i).SSID.equals(SSID)){//地址相同            return wifiConfigList.get(i).networkId;        }    }    return -1;}

6、如果需要连接的WIFI没有配置好，即没有保存密码。则为指定名称ssid的WIFI添加密码信息psw，添加成功后返回给其分配的networId，同于连接

public int AddWifiConfig(List<ScanResult> wifiList,String ssid,String pwd){    int wifiId = -1;    for(int i = 0;i < wifiList.size(); i++){        ScanResult wifi = wifiList.get(i);        if(wifi.SSID.equals(ssid)){            Log.i("AddWifiConfig","equals");            WifiConfiguration wifiCong = new WifiConfiguration();            wifiCong.SSID = "\""+wifi.SSID+"\"";//\"转义字符，代表"            wifiCong.preSharedKey = "\""+pwd+"\"";//WPA-PSK密码            wifiCong.hiddenSSID = false;            wifiCong.status = WifiConfiguration.Status.ENABLED;            wifiId = localWifiManager.addNetwork(wifiCong);//将配置好的特定WIFI密码信息添加,添加完成后默认是不激活状态，成功返回ID，否则为-1            if(wifiId != -1){                return wifiId;            }        }    }    return wifiId;}

全部代码

public class WifiUtils {    private WifiManager localWifiManager;//提供Wifi管理的各种主要API，主要包含wifi的扫描、建立连接、配置信息等    //private List<ScanResult> wifiScanList;//ScanResult用来描述已经检测出的接入点，包括接入的地址、名称、身份认证、频率、信号强度等    private List<WifiConfiguration> wifiConfigList;//WIFIConfiguration描述WIFI的链接信息，包括SSID、SSID隐藏、password等的设置    private WifiInfo wifiConnectedInfo;//已经建立好网络链接的信息    private WifiLock wifiLock;//手机锁屏后，阻止WIFI也进入睡眠状态及WIFI的关闭    public WifiUtils( Context context){        localWifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);    }    //检查WIFI状态    public int WifiCheckState(){        return localWifiManager.getWifiState();    }    //开启WIFI    public void WifiOpen(){        if(!localWifiManager.isWifiEnabled()){            localWifiManager.setWifiEnabled(true);        }    }    //关闭WIFI    public void WifiClose(){        if(!localWifiManager.isWifiEnabled()){            localWifiManager.setWifiEnabled(false);        }    }    //扫描wifi    public void WifiStartScan(){        localWifiManager.startScan();    }    //得到Scan结果    public List<ScanResult> getScanResults(){        return localWifiManager.getScanResults();//得到扫描结果    }    //Scan结果转为Sting    public List<String> scanResultToString(List<ScanResult> list){        List<String> strReturnList = new ArrayList<String>();        for(int i = 0; i < list.size(); i++){            ScanResult strScan = list.get(i);            String str = strScan.toString();            boolean bool = strReturnList.add(str);            if(!bool){                Log.i("scanResultToSting","Addfail");            }        }        return strReturnList;    }    //得到Wifi配置好的信息    public void getConfiguration(){        wifiConfigList = localWifiManager.getConfiguredNetworks();//得到配置好的网络信息        for(int i =0;i<wifiConfigList.size();i++){            Log.i("getConfiguration",wifiConfigList.get(i).SSID);            Log.i("getConfiguration",String.valueOf(wifiConfigList.get(i).networkId));        }    }    //判定指定WIFI是否已经配置好,依据WIFI的地址BSSID,返回NetId    public int IsConfiguration(String SSID){        Log.i("IsConfiguration",String.valueOf(wifiConfigList.size()));        for(int i = 0; i < wifiConfigList.size(); i++){            Log.i(wifiConfigList.get(i).SSID,String.valueOf( wifiConfigList.get(i).networkId));            if(wifiConfigList.get(i).SSID.equals(SSID)){//地址相同                return wifiConfigList.get(i).networkId;            }        }        return -1;    }    //添加指定WIFI的配置信息,原列表不存在此SSID    public int AddWifiConfig(List<ScanResult> wifiList,String ssid,String pwd){        int wifiId = -1;        for(int i = 0;i < wifiList.size(); i++){            ScanResult wifi = wifiList.get(i);            if(wifi.SSID.equals(ssid)){                Log.i("AddWifiConfig","equals");                WifiConfiguration wifiCong = new WifiConfiguration();                wifiCong.SSID = "\""+wifi.SSID+"\"";//\"转义字符，代表"                wifiCong.preSharedKey = "\""+pwd+"\"";//WPA-PSK密码                wifiCong.hiddenSSID = false;                wifiCong.status = WifiConfiguration.Status.ENABLED;                wifiId = localWifiManager.addNetwork(wifiCong);//将配置好的特定WIFI密码信息添加,添加完成后默认是不激活状态，成功返回ID，否则为-1                if(wifiId != -1){                    return wifiId;                }            }        }        return wifiId;    }    //连接指定Id的WIFI    public boolean ConnectWifi(int wifiId){        for(int i = 0; i < wifiConfigList.size(); i++){            WifiConfiguration wifi = wifiConfigList.get(i);            if(wifi.networkId == wifiId){                while(!(localWifiManager.enableNetwork(wifiId, true))){//激活该Id，建立连接                    Log.i("ConnectWifi",String.valueOf(wifiConfigList.get(wifiId).status));//status:0--已经连接，1--不可连接，2--可以连接                }                return true;            }        }        return false;    }    //创建一个WIFILock    public void createWifiLock(String lockName){        wifiLock = localWifiManager.createWifiLock(lockName);    }    //锁定wifilock    public void acquireWifiLock(){        wifiLock.acquire();    }    //解锁WIFI    public void releaseWifiLock(){        if(wifiLock.isHeld()){//判定是否锁定            wifiLock.release();        }    }    //得到建立连接的信息    public void getConnectedInfo(){        wifiConnectedInfo = localWifiManager.getConnectionInfo();    }    //得到连接的MAC地址    public String getConnectedMacAddr(){        return (wifiConnectedInfo == null)? "NULL":wifiConnectedInfo.getMacAddress();    }    //得到连接的名称SSID    public String getConnectedSSID(){        return (wifiConnectedInfo == null)? "NULL":wifiConnectedInfo.getSSID();    }    //得到连接的IP地址    public int getConnectedIPAddr(){        return (wifiConnectedInfo == null)? 0:wifiConnectedInfo.getIpAddress();    }    //得到连接的ID    public int getConnectedID(){        return (wifiConnectedInfo == null)? 0:wifiConnectedInfo.getNetworkId();    }}

自定义wifi弹出对话框

public class WifiPswDialog extends Dialog{    private Button cancelButton;    private Button okButton;    private EditText pswEdit;    private OnCustomDialogListener customDialogListener;    public WifiPswDialog(Context context,OnCustomDialogListener customListener) {            //OnCancelListener cancelListener) {        super(context);        // TODO Auto-generated constructor stub        customDialogListener = customListener;    }    //定义dialog的回调事件    public interface OnCustomDialogListener{        void back(String str);    }    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.wifi_config_dialog);        setTitle("请输入密码");        pswEdit = (EditText)findViewById(R.id.wifiDialogPsw);        cancelButton = (Button)findViewById(R.id.wifiDialogCancel);        okButton = (Button)findViewById(R.id.wifiDialogCertain);        cancelButton.setOnClickListener(buttonDialogListener);        okButton.setOnClickListener(buttonDialogListener);    }    private View.OnClickListener buttonDialogListener = new View.OnClickListener() {        @Override        public void onClick(View view) {            // TODO Auto-generated method stub            if(view.getId() == R.id.wifiDialogCancel){                pswEdit = null;                customDialogListener.back(null);                cancel();//自动调用dismiss();            }            else{                customDialogListener.back(pswEdit.getText().toString());                dismiss();            }        }    };}

具体实现

public classMainActivity extends Activity {    private String wifiPassword = null;    private Button wifiSearchButton;    private WifiUtils localWifiUtils;    private List<ScanResult> wifiResultList;    private List<String> wifiListString = new ArrayList<String>();    private ListView wifiSearchListView;    private ArrayAdapter<String> arrayWifiAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_control_pcmain);        wifiSearchButton = (Button)findViewById(R.id.wifiSearchButton);        WIFIButtonListener wifiButtonListener = new WIFIButtonListener();        wifiSearchButton.setOnClickListener(wifiButtonListener);        wifiSearchListView = (ListView)findViewById(R.id.wifiListView);        arrayWifiAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,wifiListString);        wifiSearchListView.setAdapter(arrayWifiAdapter);        ListOnItemClickListener wifiListListener = new ListOnItemClickListener();        wifiSearchListView.setOnItemClickListener(wifiListListener);        localWifiUtils = new WifiUtils(ControlPCMainActivity.this);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.control_pcmain, menu);        return true;    }    class WIFIButtonListener implements OnClickListener{        @Override        public void onClick(View view) {            // TODO Auto-generated method stub            wifiListString.clear();            localWifiUtils.WifiOpen();            localWifiUtils.WifiStartScan();            //0正在关闭,1WIFi不可用,2正在打开,3可用,4状态不可zhi            while(localWifiUtils.WifiCheckState() != WifiManager.WIFI_STATE_ENABLED){//等待Wifi开启                Log.i("WifiState",String.valueOf(localWifiUtils.WifiCheckState()));            }            try {                    Thread.sleep(3000);//休眠3s，不休眠则会在程序首次开启WIFI时候，处理getScanResults结果，wifiResultList.size()发生异常                } catch (InterruptedException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            wifiResultList = localWifiUtils.getScanResults();            localWifiUtils.getConfiguration();            if(wifiListString != null){                Log.i("WIFIButtonListener","dataChange");                scanResultToString(wifiResultList,wifiListString);            }        }    }    class ListOnItemClickListener implements OnItemClickListener{        String wifiItemSSID = null;        private View selectedItem;        @Override        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,                long arg3) {            // TODO Auto-generated method stub            Log.i("ListOnItemClickListener","start");            selectedItem = arg1;            arg1.setBackgroundResource(R.color.gray);//点击的Item项背景设置            String wifiItem = arrayWifiAdapter.getItem(arg2);//获得选中的设备            String []ItemValue = wifiItem.split("--");            wifiItemSSID = ItemValue[0];             Log.i("ListOnItemClickListener",wifiItemSSID);            int wifiItemId = localWifiUtils.IsConfiguration("\""+wifiItemSSID+"\"");            Log.i("ListOnItemClickListener",String.valueOf(wifiItemId));            if(wifiItemId != -1){                if(localWifiUtils.ConnectWifi(wifiItemId)){//连接指定WIFI                    arg1.setBackgroundResource(R.color.green);                }            }            else{//没有配置好信息，配置                WifiPswDialog pswDialog = new WifiPswDialog(ControlPCMainActivity.this,new OnCustomDialogListener() {                    @Override                    public void back(String str) {                        // TODO Auto-generated method stub                        wifiPassword = str;                        if(wifiPassword != null){                            int netId = localWifiUtils.AddWifiConfig(wifiResultList,wifiItemSSID, wifiPassword);                            Log.i("WifiPswDialog",String.valueOf(netId));                            if(netId != -1){                                localWifiUtils.getConfiguration();//添加了配置信息，要重新得到配置信息                                if(localWifiUtils.ConnectWifi(netId)){                                    selectedItem.setBackgroundResource(R.color.green);                                }                            }                            else{                                Toast.makeText(ControlPCMainActivity.this, "网络连接错误", Toast.LENGTH_SHORT).show();                                selectedItem.setBackgroundResource(R.color.burlywood);                            }                        }                        else{                            selectedItem.setBackgroundResource(R.color.burlywood);                        }                    }                });                pswDialog.show();            }        }    }    //ScanResult类型转为String    public void scanResultToString(List<ScanResult> listScan,List<String> listStr){        for(int i = 0; i <listScan.size(); i++){            ScanResult strScan = listScan.get(i);            String str = strScan.SSID+"--"+strScan.BSSID;            boolean bool = listStr.add(str);            if(bool){                arrayWifiAdapter.notifyDataSetChanged();//数据更新,只能单个Item更新，不能够整体List更新            }            else{                Log.i("scanResultToSting","fail");            }            Log.i("scanResultToString",listStr.get(i));        }    }    private BroadcastReceiver WifiBroadcastRec = new BroadcastReceiver(){    @Override    public void onReceive(Context context, Intent intent) {        // TODO Auto-generated method stub        String wifiAction = intent.getAction();        if(WifiManager.WIFI_STATE_CHANGED_ACTION.equals(wifiAction)){            int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,WifiManager.WIFI_STATE_ENABLED);            if(wifiState == WifiManager.WIFI_STATE_ENABLED){                try {                    Thread.sleep(3000);//休眠3s，不休眠则会在程序首次开启WIFI时候，处理getScanResults结果，wifiResultList.size()发生异常                } catch (InterruptedException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }                wifiResultList = localWifiUtils.getScanResults();                localWifiUtils.getConfiguration();                if(wifiListString != null){                    scanResultToString(wifiResultList,wifiListString);                }            }        }        }    };}