android wifi开发

这个小项目实现了，WiFi的开关、获取WiFi扫描列表、获取保存的WiFi列表、连接WiFi、获取WiFi连接的各种状态。利用接口回调实现活动与广播的通信。下面是一张效果图。

使用WiFi需要这么几个权限。

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

简单说一下几个比较容易出问题的地方，WiFi扫描获取WiFi列表的时候，一定要注册了一个监听扫描完成的广播，虽然不监听广播也能获取的列表，但是你不知道它什么时候扫描完的，而且WiFi是会自己不断的扫描的，监听广播也就可以像手机WiFi那样自动的刷新列表了。连接WiFi的时候要根据WiFi锁的类型来连接（一般是psk），代码中有给出。WiFimanager有多个广播，通过监听广播得到很多信息代码中没有给出全部，可以参考文档：http://www.android-doc.com/reference/android/net/wifi/WifiManager.html 然后关于连接状态，代码中给了几个常见的身份验证、获取ID、连接失败什么的。这些状态都在networkinfo中，如需要获取其他信息查看这个类的DetailedState：http://www.android-doc.com/reference/android/net/NetworkInfo.html。关于活动去广播通信，最常用的是接口回调（我这里用的就是接口回调），当然还有其他的方式，如静态变量（需要主活动开个线程一直去读这个变量），广播接收器里面再发送一个简单的广播给活动（毕竟广播经常用来通信）。

给个项目的下载地址：http://download.csdn.net/download/lhp15575865420/10040883

public class MainActivity extends AppCompatActivity {    private Button button1;    private Button button2;    private Button button3;    private MyAdapter myAdapter;    private LinkedList<Data> datas;    private RecyclerView recycle;    private WifiManager wifiManager;    private WifiInfo wifiInfo;    private Mywifi mywifi;    private List<ScanResult> results;    private List<WifiConfiguration> configurations;    private  WifiReceiver wifiReceiver;    private final int SCANRE=1;//搜索到WiFi列表标志    private final int CONFIG=2;//连接过WiFi列表标志    private static int change=1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button1= (Button) findViewById(R.id.button1);        button2= (Button) findViewById(R.id.button2);        button3= (Button) findViewById(R.id.button3);        initRecyclerView();        mywifi=new Mywifi(MainActivity.this);        initReceiver();        somelisten();    }    public void initRecyclerView(){        recycle= (RecyclerView) findViewById(R.id.recycle);        datas=new LinkedList<Data>();            datas.add(new Data("WiFI名字","物理地址"));        myAdapter=new MyAdapter(datas,MainActivity.this);        //设置布局为线性布局，默认竖直        recycle.setLayoutManager(new LinearLayoutManager(this));        recycle.setAdapter(myAdapter);        //设置添加和删除的动画效果        recycle.setItemAnimator(new DefaultItemAnimator());        //设置横向分割线        recycle.addItemDecoration(new DividerItemDecoration(MainActivity.this, LinearLayoutManager.VERTICAL));    }    public void somelisten(){        button1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                switch (mywifi.checkwifistate()){                    case 0:                        Toast.makeText(MainActivity.this,"WiFi正在关闭",Toast.LENGTH_SHORT).show();                        break;                    case 1:                        mywifi.openwifi();                        break;                    case 2:                        Toast.makeText(MainActivity.this,"WiFi正在打开",Toast.LENGTH_SHORT).show();                        break;                    case 3:                        mywifi.closewifi();                        break;                }            }        });        button2.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if(change==SCANRE){                    myAdapter.removeAll();                    configurations=mywifi.getConfigurations();                    if(configurations!=null)                    for(int i=0;i<configurations.size();i++){                        myAdapter.add(new Data(configurations.get(i).SSID,                                "物理地址不确定"));                    }                    change=CONFIG;                }else{                    myAdapter.removeAll();                    results=mywifi.getWifilist();                    for(int i=0;i<results.size();i++){                        myAdapter.add(new Data(results.get(i).SSID,                                results.get(i).BSSID));                    }                    change=SCANRE;                }            }        });        button3.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                mywifi.closeconnect();            }        });        myAdapter.setOnItemClickListener(new MyAdapter.OnItemClickListener() {            @Override            public void onItemClick(View view, int postion) {               if(results==null) return;                if(change==CONFIG){                    Toast.makeText(MainActivity.this,"只能连接搜索到的WiFi",Toast.LENGTH_SHORT).show();                    return;                }                Toast.makeText(MainActivity.this,results.get(postion).toString(),Toast.LENGTH_SHORT).show();                mywifi.wificonnect(results.get(postion),"12345678");//假设密码是12345678            }            @Override            public void onItemLongClick(View view, int postion) {            }        });    }    public void initReceiver(){        wifiReceiver=new WifiReceiver();        IntentFilter intentFilter=new IntentFilter();        intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);        intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);        intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);        registerReceiver(wifiReceiver,intentFilter);        //回调接口监听        wifiReceiver.setMsglistener(new WifiReceiver.Msg() {            @Override            public void getmsg(String msg) {                if(msg.equals("ok")){                    myAdapter.removeAll();                    results=mywifi.getWifilist();                    Log.e("扫描结果", String.valueOf(results.size()));                    for(int i=0;i<results.size();i++){                        myAdapter.add(new Data( results.get(i).SSID,                                results.get(i).BSSID));                    }                }            }        });    }    @Override    protected void onDestroy() {        super.onDestroy();        unregisterReceiver(wifiReceiver);    }}

public class Mywifi {    private WifiManager wifiManager;//WiFi管理器    private WifiInfo wifiInfo;    private List<ScanResult> wifilist;//扫描到的WiFi列表    private List<WifiConfiguration> configurations;//配置好(连接过)的WiFi列表    //锁屏后，其他程序没有用到WiFi，过一会WiFi会自动关闭，加WiFi后则不会    private WifiManager.WifiLock lock;//wifi锁。    public Mywifi(Context context) {        wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);        lock=wifiManager.createWifiLock(2,"mylock");        /*locktype 1:会自动连接一个记住的接入点。没有连接到记住的接入点的时候，自动扫描，        2：只扫描，在这种模式下，程序必须显示地请求扫描        3：以最好的性能执行1        */    }    //打开WiFi，锁定WiFi,扫描WiFi    public void openwifi(){        if(!wifiManager.isWifiEnabled()){            wifiManager.setWifiEnabled(true);            Log.e("Wifi","打开WiFi");            lock.acquire();        }        scan();    }    //扫描WiFi    public void scan(){wifiManager.startScan();}    //关闭WiFi    public void closewifi(){        if(wifiManager.isWifiEnabled()){            wifiManager.setWifiEnabled(false);        }    }    //检查WiFi状态    public int checkwifistate(){        //0:wifi正在关闭。1：WiFi已经关闭。2：WiFi正在开启。3：WiFi已经开启        return wifiManager.getWifiState();    }    //获取搜索到的WiFi列表    public List<ScanResult> getWifilist(){        wifilist=wifiManager.getScanResults();        return wifilist;    }    //获取连接过的WiFi列表    public List<WifiConfiguration> getConfigurations(){        configurations=wifiManager.getConfiguredNetworks();        return configurations;    }    //连接指定WiFi    public void wificonnect(ScanResult scan,String password){        WifiConfiguration config=new WifiConfiguration();        //对config初始化，将他的各个参数清空        config.allowedAuthAlgorithms.clear();        config.allowedGroupCiphers.clear();        config.allowedKeyManagement.clear();        config.allowedPairwiseCiphers.clear();        config.allowedProtocols.clear();        config.SSID=scan.SSID;//通过ssid来标识一个WiFi        Log.e("WiFi连接",scan.SSID);        //判断锁的类型。通过scanresult的结果是否含有某些值来确定        //根据锁的类型来设置某些参数        if(scan.capabilities.contains("WEP")){            Log.e("WiFi连接","wep加密");            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);            config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);//            config.allowedAuthAlgorithms.set(WifiConfiguration.GroupCipher.WEP40);//            config.allowedAuthAlgorithms.set(WifiConfiguration.GroupCipher.CCMP);//            config.allowedAuthAlgorithms.set(WifiConfiguration.GroupCipher.TKIP);            config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);            config.wepTxKeyIndex=0;            config.wepKeys[0]=password;        }else if(scan.capabilities.contains("PSK")){            Log.e("WiFi连接","psk加密");            config.preSharedKey="\""+password+"\"";        }else if(scan.capabilities.contains("EAP")){            Log.e("WiFi连接","eap加密");            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_EAP);            config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);            config.allowedAuthAlgorithms.set(WifiConfiguration.GroupCipher.TKIP);            config.allowedProtocols.set(WifiConfiguration.Protocol.WPA);            config.preSharedKey="\""+password+"\"";        }else {//没有加密            Log.e("WiFi连接","没有加密");            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);            //config.wepTxKeyIndex=0;            //config.wepKeys[0]="";        }        int i=wifiManager.addNetwork(config);//连接到WiFi。        Log.e("连接结果", String.valueOf(i));    }    //断开连接    public void closeconnect(){        //wifiManager.disconnect();        wifiInfo=wifiManager.getConnectionInfo();//获取当前连接        int netid=wifiInfo.getNetworkId();        wifiManager.disableNetwork(netid);    }}

public class WifiReceiver extends BroadcastReceiver{    private Msg msg;//与activity通信    @Override    public void onReceive(Context context, Intent intent) {        String action=intent.getAction();        Log.e("action",action);        if(WifiManager.WIFI_STATE_CHANGED_ACTION.equals(action)){            int wifistate=intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,WifiManager.WIFI_STATE_DISABLED);            if(wifistate==WifiManager.WIFI_STATE_ENABLED) {                Log.e("广播wifistate", "wifi打开");            }            if(wifistate==WifiManager.WIFI_STATE_DISABLED) Log.e("广播wifistate","wifi关闭");        }        else if(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION.equals(action)){            Log.e("广播sacn","wifi扫描完成");            msg.getmsg("ok");        }        else if(WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(action)){            NetworkInfo info=intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);            if(info.getState().equals(NetworkInfo.State.DISCONNECTED)) Log.e("广播Network","WiFi网络连接断开");            if(info.getState().equals(NetworkInfo.State.CONNECTED)) Log.e("广播Network","连接到WiFi网络");            if(info.getDetailedState().equals(NetworkInfo.DetailedState.OBTAINING_IPADDR)) Log.e("广播Network","获取IP地址中");            if(info.getDetailedState().equals(NetworkInfo.DetailedState.DISCONNECTED)) Log.e("广播Network","ip不可用");            if(info.getDetailedState().equals(NetworkInfo.DetailedState.SCANNING)) Log.e("广播Network","正在扫描");            if(info.getDetailedState().equals(NetworkInfo.DetailedState.AUTHENTICATING)) Log.e("广播Network","身份验证中");            if(info.getDetailedState().equals(NetworkInfo.DetailedState.FAILED))  Log.e("广播Network","连接失败");            //http://www.android-doc.com/reference/android/net/NetworkInfo.html        }        //http://www.android-doc.com/reference/android/net/wifi/WifiManager.html    }    //通过接口实现与activity之间的通信    public interface Msg{        public void getmsg(String msg);    }    public void setMsglistener(Msg msg){        this.msg=msg;    }}