Android wifi 扫描、连接

概述

工作需要用到扫描周围wifi并连接到指定wifi功能，在这里做一个记录。在Android 7.0 和 8.1 都测试过都可用。代码来源网络。扫描并连接指定wifi包括以下4个步骤：

• 受权
• 扫描周围的wifi
• 注册广播监听wifi状态变化
• 连接指定的wifi

受权

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

    //要定位权限才能搜索wifi    PermissionUtil.requestEach(this, new PermissionUtil.OnPermissionListener() {        @Override        public void onSucceed() {            //受权成功后打开wifi            scanWifiInfo();        }        @Override        public void onFailed(boolean showAgain) {        }    }, PermissionUtil.LOCATION);

扫描周围的wifi

    /**     * 扫描周围wifi     */    private void scanWifiInfo() {        String wserviceName = Context.WIFI_SERVICE;        WifiManager mWifiManager = (WifiManager) getSystemService(wserviceName);        mWifiManager.setWifiEnabled(true);        mWifiManager.startScan();        mWifiList.clear();        mWifiList = mWifiManager.getScanResults();        if(mWifiList != null && mWifiList.size() > 0) {            adapter = new ListAdapter(this, mWifiList);            listView.setAdapter(adapter);            listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {                @Override                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                    //连接wifi                    ScanResult scanResult = mWifiList.get(position);                    connectWifi(scanResult.SSID, "ILOVEYOU", "WPA");                }            });        }    }

注册广播监听wifi状态变化

    @Override    public void onResume() {        super.onResume();        //注册广播        wifiReceiver = new WifiBroadcastReceiver();        IntentFilter filter = new IntentFilter();        filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);//监听wifi是开关变化的状态        filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);//监听wifiwifi连接状态广播        filter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);//监听wifi列表变化（开启一个热点或者者关闭一个热点）        registerReceiver(wifiReceiver, filter);    }    @Override    public void onPause() {        super.onPause();        //取消监听        unregisterReceiver(wifiReceiver);    }

    //监听wifi状态广播接收器    public class WifiBroadcastReceiver extends BroadcastReceiver {        @Override        public void onReceive(Context context, Intent intent) {            if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction())) {                int state = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);                switch (state) {                    /**                     * WIFI_STATE_DISABLED    WLAN已经关闭                     * WIFI_STATE_DISABLING   WLAN正在关闭                     * WIFI_STATE_ENABLED     WLAN已经打开                     * WIFI_STATE_ENABLING    WLAN正在打开                     * WIFI_STATE_UNKNOWN     未知                     */                    case WifiManager.WIFI_STATE_DISABLED: {                        Log.i(TAG, "已经关闭");                        break;                    }                    case WifiManager.WIFI_STATE_DISABLING: {                        Log.i(TAG, "正在关闭");                        break;                    }                    case WifiManager.WIFI_STATE_ENABLED: {                        Log.i(TAG, "已经打开");//                        sortScaResult();                        break;                    }                    case WifiManager.WIFI_STATE_ENABLING: {                        Log.i(TAG, "正在打开");                        break;                    }                    case WifiManager.WIFI_STATE_UNKNOWN: {                        Log.i(TAG, "未知状态");                        break;                    }                }            } else if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction())) {                NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);                Log.i(TAG, "--NetworkInfo--" + info.toString());                if (NetworkInfo.State.DISCONNECTED == info.getState()) {//wifi没连接上                    Log.i(TAG, "wifi没连接上");                } else if (NetworkInfo.State.CONNECTED == info.getState()) {//wifi连接上了                    Log.i(TAG, "wifi连接上了");                } else if (NetworkInfo.State.CONNECTING == info.getState()) {//正在连接                    Log.i(TAG, "wifi正在连接");                }            } else if (WifiManager.SCAN_RESULTS_AVAILABLE_ACTION.equals(intent.getAction())) {                Log.i(TAG, "网络列表变化了");            }        }    }

连接指定的wifi

    /**     * 连接wifi     * @param targetSsid wifi的SSID     * @param targetPsd 密码     * @param enc 加密类型     */    @SuppressLint("WifiManagerLeak")    public void connectWifi(String targetSsid, String targetPsd, String enc) {        // 1、注意热点和密码均包含引号，此处需要需要转义引号        String ssid = "\"" + targetSsid + "\"";        String psd = "\"" + targetPsd + "\"";        //2、配置wifi信息        WifiConfiguration conf = new WifiConfiguration();        conf.SSID = ssid;        switch (enc) {            case "WEP":                // 加密类型为WEP                conf.wepKeys[0] = psd;                conf.wepTxKeyIndex = 0;                conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);                conf.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);                break;            case "WPA":                // 加密类型为WPA                conf.preSharedKey = psd;                break;            case "OPEN":                //开放网络                conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);        }        //3、链接wifi        WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);        wifiManager.addNetwork(conf);        List<WifiConfiguration> list = wifiManager.getConfiguredNetworks();        for (WifiConfiguration i : list) {            if (i.SSID != null && i.SSID.equals(ssid)) {                wifiManager.disconnect();                wifiManager.enableNetwork(i.networkId, true);                wifiManager.reconnect();                break;            }        }    }

最后附上代码的 GitHub地址