如何在Android中以编程方式一个接一个地连接到多个Wifi网络？
我想使用Android API检查一些预定义的开放Wifi网络的存在（我想在检查它们的存在之前以编程方式添加它们）。 这就是我所做的。 我创建了一个空白的Activity，如下所示：
WifiManager wifiManager; protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); wifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE); myWifis(); } public void myWifis() { //Add first network wcOne = new WifiConfiguration(); wcOne.SSID = "\"" + networkOne + "\""; wcOne.status = WifiConfiguration.Status.ENABLED; wcOne.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); //Get Network ID from the wifiManager Object netOneId = wifiManager.addNetwork(wcOne); if (networkOneId != -1) { networkOnePresent = wifiManager.enableNetwork(wcOne.networkId, true); } //Add second network wcTwo = new WifiConfiguration(); wcTwo.SSID = "\"" + networkTwo + "\""; wcTwo.status = WifiConfiguration.Status.ENABLED; wcTwo.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); //Get Network ID from the wifiManager Object netTwoId = mainWifiObj.addNetwork(wcTwo); if (netTwoId != -1) { networkTwoPresent = mainWifiObj.enableNetwork(wcTwo.networkId, true); } if(networkOnePresent && networkTwoPresent) createAlert(true); else createAlert(false); wifiManager.disconnect(); wifiManager.removeNetwork(wcOne.networkId); wifiManager.removeNetwork(wcTwo.networkId); } public void createAlert(boolean bothNetworksPresent){ if(bothNetworksPresent){ AlertDialog.Builder alertDialog = new AlertDialog.Builder(this); alertDialog.setTitle("Both networks present") .setMessage("Both networks present") .setCancelable(false) .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener(){ public void onClick(DialogInterface dialog, int id){ } }); AlertDialog dialog = alertDialog.create(); dialog.show(); } else{ AlertDialog.Builder alertDialog = new AlertDialog.Builder(this); alertDialog.setTitle("Not Present") .setMessage("Not Present") .setCancelable(false) .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener(){ public void onClick(DialogInterface dialog, int id){ } }); AlertDialog dialog = alertDialog.create(); dialog.show(); } } 。 我看到两个网络都被添加到我的Wifi列表中，但是我收到一条消息“不存在”。 这很奇怪，因为当我进入Android的Wifi菜单时，我最初看不到Wifi存在，但是当我点击扫描时，我看到了那些网络。
我想检查一下我是否可以连接到两个 Wifi热点。 我想连接到一个热点断开然后连接到另一个。 我该怎么做呢？
编辑：
我还注意到我添加的Wifi网络没有从列表中删除。 这有什么特别的原因吗？
编辑2
我甚至尝试改变我的整个代码来分别监听BroadcastReceiver以进行扫描和连接，并且在一定的时间间隔之后也是如此。 所以这就是我做的：
WifiManager wifiManager; private final Handler mHandler = new Handler(); public final String TAG = "myWifiScanner"; boolean isOneAdded = false, isTwoAdded = false, isThreeAdded = false; boolean isOneConnected = false, isTwoConnected = false, isThreeConnected = false; boolean isOneEnabled = false, isTwoEnabled = false, isThreeEnabled = false; IntentFilter iFScan, iFConnect; List scanList; protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); wifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE); checkConnections(); } private void receiverMethod(){ //iFScan = new IntentFilter(); iFConnect = new IntentFilter(); iFConnect.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION); iFConnect.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION); //registerReceiver(scanR, iFScan); registerReceiver(connectR, iFConnect); wifiManager.startScan(); Log.d(TAG, "\nScan started\n"); } private final BroadcastReceiver connectR = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { final String action = intent.getAction(); if(action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)){ if(intent.getBooleanExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED, false)){ String ssid = null; ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI); if(netInfo.isConnected()){ final WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE); final WifiInfo connectionInfo = wifiManager.getConnectionInfo(); if(connectionInfo != null && !TextUtils.isEmpty(connectionInfo.getSSID())){ ssid = connectionInfo.getSSID(); if(isOneAdded && ssid.equals(networkOne)){ isOneConnected = true; Log.d(TAG, "One Connected\n"); } if(isTwoAdded && ssid.equals(networkTwo)){ isTwoConnected = true; Log.d(TAG, "Two Connected\n"); } if(isThreeAdded && ssid.equals(networkThree)){ isThreeConnected = true; Log.d(TAG, "Three Connected\n"); } } } } if(action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)){ scanList = wifiManager.getScanResults(); for(int i = 0; i < scanList.size(); i++){ if(isOneAdded && scanList.get(i).toString().contains(networkOne)){ isOneEnabled = true; Log.d(TAG, "One Enabled\n"); } if(isTwoAdded && scanList.get(i).toString().contains(networkTwo)){ isTwoEnabled = true; Log.d(TAG, "Two Enabled\n"); } if(isThreeAdded && scanList.get(i).toString().contains(networkThree)){ isThreeEnabled = true; Log.d(TAG, "Three Enabled\n"); } } } } }; public final Runnable addNetworkOne = new Runnable() { @Override public void run() { //Add first network wcOne = new WifiConfiguration(); wcOne.SSID = "\"" + networkOne + "\""; wcOne.status = WifiConfiguration.Status.ENABLED; wcOne.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); //Get Network ID from the wifiManager Object netOneId = wifiManager.addNetwork(wcOne); if (networkOneId != -1) { networkOnePresent = wifiManager.enableNetwork(wcOne.networkId, true); } } isOneAdded = true receiverMethod(); }; public final Runnable addNetworkTwo = new Runnable() { @Override public void run() { //Add second network wcTwo = new WifiConfiguration(); wcTwo.SSID = "\"" + networkTwo + "\""; wcTwo.status = WifiConfiguration.Status.ENABLED; wcTwo.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); //Get Network ID from the wifiManager Object netTwoId = wifiManager.addNetwork(wcTwo); if (netTwoId != -1) { networkTwoPresent = wifiManager.enableNetwork(wcTwo.networkId, true); } } isTwoAdded = true receiverMethod(); }; public final Runnable addNetworkThree = new Runnable() { @Override public void run() { //Add three network wcThree = new WifiConfiguration(); wcThree.SSID = "\"" + networkThree + "\""; wcThree.status = WifiConfiguration.Status.ENABLED; wcThree.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); //Get Network ID from the wifiManager Object netThreeId = wifiManager.addNetwork(wcTwo); if (netThreeId != -1) { networkThreePresent = wifiManager.enableNetwork(wcThree.networkId, true); } } isThreeAdded = true receiverMethod(); }; public final Runnable areAllWifisPresent = new Runnable() { @Override public void run() { if(isOneEnabled && isTwoEnabled && isThreeeEnabled){ if(isOneConnected && isTwoConnected && isThreeConnected){ Log.d(TAG, "All three Wifis are present."); } } }; public void checkConnections() { mHandler.postDelayaed(addNetworkOne, 10*1000); mHandler.postDelayed(addNetworkTwo, 20*1000); mHandler.postDelayed(addNetworkThree, 30*1000); mHandler.postDelayed(areAllWifisPresent, 40*1000); //wifiManager.disconnect(); //wifiManager.removeNetwork(wcOne.networkId); //wifiManager.removeNetwork(wcTwo.networkId); //wifiManager.removeNetwork(wcThree.networkId); }
**编辑3：**我还注意到用于检查Wifi是否已连接的接收器未被调用。 我不知道为什么。
请将您的MyWifi（）方法更改为
public void myWifis() { WifiManager wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE); wifiManager.setWifiEnabled(true); //Add first network wcOne = new WifiConfiguration(); wcOne.SSID = "\""+SSID+"\""; wcOne.status = WifiConfiguration.Status.ENABLED; wcOne.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); //Get Network ID from the MainWiFi Object int netOneId = mainWifiObj.addNetwork(wcOne); boolean networkOnePresent = false; //this way we will enable wifi network. List list = wifiManager.getConfiguredNetworks(); for( WifiConfiguration i : list ) { Log.d("wifi", "wifi SSID is = "+i.SSID); if(i.SSID != null && i.SSID.equals("\"" + SSID + "\"")) { wifiManager.disconnect(); networkOnePresent = wifiManager.enableNetwork(i.networkId, true); wifiManager.reconnect(); Log.d("wifi", "net id is = "+netOneId); break; } } if(networkOnePresent) createAlert(true); else createAlert(false); }
它会工作。