Android WIFI的基本操作

WIFI管理类

class WifiConnector {
    private ExecutorService executors;
    Handler mHandler;
    WifiManager wifiManager;

    WifiConnector(WifiManager wifiManager, Handler handler) {
        this.wifiManager = wifiManager;
        executors= Executors.newSingleThreadExecutor();
        mHandler=handler;
    }

    private void sendMsg(String info) {
        if (mHandler != null) {
            Message msg = new Message();
            msg.obj = info;
            mHandler.sendMessage(msg);
        }
    }

    //WIFICIPHER_WEP是WEP ，WIFICIPHER_WPA是WPA，WIFICIPHER_NOPASS没有密码
    public enum WifiCipherType {
        WIFICIPHER_WEP, WIFICIPHER_WPA, WIFICIPHER_NOPASS, WIFICIPHER_INVALID
    }

    // 打开wifi
    public boolean openWifi() {
        return !wifiManager.isWifiEnabled() && wifiManager.setWifiEnabled(true);
    }
    // 关闭wifi
    public void closeWifi() {
         if (!wifiManager.isWifiEnabled()) {
            wifiManager.setWifiEnabled(false);

         }
    }
    //断开当前连接
    public boolean disconnectWifi() {
        return wifiManager.disconnect();
    }

    //扫描wifi信息
    public void scanWifi(){
            if(wifiManager.isWifiEnabled()){
                //扫描热点 如果扫描不到热点 把targetSdkVersion改成22
                wifiManager.startScan();
            }
    }

    //获取热点信息 ScanResult.SSID 获取热点名字 ScanResult.level 获取热点信号强度
    public List<ScanResult> scanResultsWifi(){
        if(wifiManager.isWifiEnabled()){
            //扫描热点 如果扫描不到热点 把targetSdkVersion改成22
            return wifiManager.getScanResults();
        }
        return null;
    }

    // 连接指定wifi
    public  void  connect(String ssid, String password, WifiCipherType type) {
        executors.execute(new Thread(new ConnectRunnable(ssid, password, type)));
    }

    // 查看以前是否也配置过这个网络
    public WifiConfiguration isExsits(String SSID) {
        List<WifiConfiguration> existingConfigs = wifiManager .getConfiguredNetworks();
        for (WifiConfiguration existingConfig : existingConfigs) {
            if (existingConfig.SSID.equals("\"" + SSID + "\"")) {
                return existingConfig;
            }
        }
        return null;
    }

    //配置wifi信息
    private WifiConfiguration createWifiInfo(String SSID, String Password,
                                            WifiCipherType 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 =isExsits(SSID);

        // nopass
        if (Type == WifiCipherType.WIFICIPHER_NOPASS) {
            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
        }
        // wep
        if (Type == WifiCipherType.WIFICIPHER_WEP) {
            if (!TextUtils.isEmpty(Password)) {
                if (isHexWepKey(Password)) {
                    config.wepKeys[0] = Password;
                } else {
                    config.wepKeys[0] = "\"" + Password + "\"";
                }
            }
            config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
            config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);
            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
            config.wepTxKeyIndex = 0;
        }
        // wpa
        if (Type == WifiCipherType.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);
            // 此处需要修改否则不能自动重联
            // 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;
    }

   class ConnectRunnable implements Runnable {
        private String ssid;
        private String password;
        private WifiCipherType type;

        private ConnectRunnable(String ssid, String password, WifiCipherType type) {
            this.ssid = ssid;
            this.password = password;
            this.type = type;
        }

        @Override
        public void run() {
            try {
                // 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WIFI_STATE_ENABLED的时候才能执行下面的语句
                while (wifiManager.getWifiState() == WifiManager.WIFI_STATE_ENABLING) {
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException ignored) {
                    }
                }
                WifiConfiguration wifiConfig = createWifiInfo(ssid, password,type);
                if (wifiConfig == null) {
                    return;
                }
                 WifiConfiguration tempConfig = isExsits(ssid);
                 if (tempConfig != null) {
                    wifiManager.removeNetwork(tempConfig.networkId);
                }
                int netID = wifiManager.addNetwork(wifiConfig);
                boolean enabled = wifiManager.enableNetwork(netID, true);
                Thread.sleep(1000);
                if(enabled){
                    sendMsg("0");
                }else{
                    sendMsg("1");
                }
            } catch (Exception e) {
                // TODO: handle exception
                e.printStackTrace();
            }
        }
    }

    private static boolean isHexWepKey(String wepKey) {
        final int len = wepKey.length();
        // WEP-40, WEP-104, and some vendors using 256-bit WEP (WEP-232?)
        return !(len != 10 && len != 26 && len != 58) && isHex(wepKey);
    }

    private static boolean isHex(String key) {
        for (int i = key.length() - 1; i >= 0; i--) {
            final char c = key.charAt(i);
            if (!(c >= '0' && c <= '9' || c >= 'A' && c <= 'F' || c >= 'a'
                    && c <= 'f')) {
                return false;
            }
        }
        return true;
    }
}

连接指定WIFI实例

public class MainActivity extends AppCompatActivity implements ICheckDialogListener{
    private ListView listview;
    private CheckDialog dialg;
    private Button scranButton;
    private WifiManager mainWifi;
    private WifiReceiver receiverWifi;
    private WifiConnector wifycon;

    // 连接WIFI
    private ScanResult scanRet;
    //扫描出的wifi列表
    public List<ScanResult> wifiList;
    //选中的wifi项
    private int wifiPosition;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        scranButton=findViewById(R.id.scranButton);
        listview=findViewById(R.id.listview);
        dialg=new CheckDialog(this,R.style.AppTheme,this);

        //初始化wifi管理器 这里如果用this可能会造成内存泄漏
        mainWifi = (WifiManager) getApplicationContext().getApplicationContext().getSystemService(Context.WIFI_SERVICE);
        //监听wifi的广播,必须动态注册
        receiverWifi = new WifiReceiver();
        //初始化wifi连接类
        wifycon=new WifiConnector(mainWifi,handler);

        scranButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //判断wifi是否打开，否则打开
                wifycon.openWifi();
                //扫描热点 如果扫描不到热点 把targetSdkVersion改成22
                //mainWifi.startScan();
                Toast.makeText(MainActivity.this,"扫描WIFI热点,请稍候", Toast.LENGTH_SHORT).show();
            }
        });

    }
    protected void onResume(){
        super.onResume();
        //注册广播
        registerReceiver(receiverWifi, new IntentFilter(
                WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
    }

    class WifiReceiver extends BroadcastReceiver{
        public void onReceive(Context context, Intent intent){
            //扫描完毕接受到的广播
            if (intent.getAction().equals(
                    WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)){
                wifycon.scanWifi();
                wifiList=wifycon.scanResultsWifi();
                ArrayAdapter<String> adapter = new ArrayAdapter<>(MainActivity.this,
                        R.layout.wify_item,
                        getString(wifiList));
                listview.setAdapter(adapter);
                listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                        dialg.show();
                        wifiPosition=position;
                    }
                });
            }
        }
    }

    @SuppressLint("HandlerLeak")
    Handler handler=new Handler() {
        @Override
        public void handleMessage(Message msg) {
            if("0".equals(msg.obj.toString())){
                Toast.makeText(MainActivity.this,msg.obj.toString(),Toast.LENGTH_SHORT).show();
            }else if("1".equals(msg.obj.toString())){
                Toast.makeText(MainActivity.this,"密码输入错误！",Toast.LENGTH_SHORT).show();
            }
        }
    };

    @Override
    public void sendStr(String msg) {
        scanRet = wifiList.get(wifiPosition);
        wifycon.connect(scanRet.SSID,msg, WifiConnector.WifiCipherType.WIFICIPHER_WPA);
    }

    public String[] getString(List<ScanResult> wifiList){
        ArrayList<String> listStr = new ArrayList<>();

        for (int i = 0; i < wifiList.size(); i++){
            listStr.add(wifiList.get(i).SSID);
        }
        return listStr.toArray(new String[0]);
    }
}

回调接口

public interface ICheckDialogListener {
    public void sendStr(String msg) ;
}

弹框验证

public class CheckDialog extends Dialog implements View.OnClickListener {
    private EditText tvContent;
    private Button butCancel;
    private Button but_confirm;
    private Activity context;
    private ICheckDialogListener dialogListener;
    public CheckDialog(Activity context, int theme, ICheckDialogListener dialListener) {
        super(context, theme);
        this.context = context;
        dialogListener=dialListener;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.check_dialog);
        tvContent=findViewById(R.id.tv_content);
        butCancel=findViewById(R.id.but_cancel);
        butCancel.setOnClickListener(this);
        but_confirm =findViewById(R.id.but_confirm);
        but_confirm.setOnClickListener(this);

    }


    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.but_confirm) {
            String key = (tvContent.getText() + "").trim();
            if ("".equals(key) | "null".equals(key)) {
                Toast.makeText(context, "输入不能为空！", Toast.LENGTH_SHORT).show();
            } else if (dialogListener==null) {
                context.finish();
                System.exit(0);
            } else if(dialogListener!=null){
                dialogListener.sendStr(key);
            } else{
                Toast.makeText(context, "密码输入错误！！", Toast.LENGTH_SHORT).show();
            }
            this.dismiss();
        }else if(v.getId() == R.id.but_cancel){
            this.dismiss();
        }
    }
}