Handle null return values from WifiManager.getConfiguredNetworks(). It seems to occur in some instances.

Author: tuaminen

android/src/main/java/com/devstepbcn/wifi/AndroidWifiModule.java

@@ -253,6 +253,10 @@ public Boolean connectTo(ScanResult result, String password, String ssid) {
 		}
 
 		List<WifiConfiguration> mWifiConfigList = wifi.getConfiguredNetworks();
+		if (mWifiConfigList == null) {
+		    return false;
+        }
+
 		int updateNetwork = -1;
 
 		// Use the existing network config if exists
@@ -316,6 +320,11 @@ public int setWifiConfig(String ssid, String sharedKey) {
 	@ReactMethod
 	public void connectToHiddenNetwork(String ssid, String password, Callback networkAdded) {
 		List<WifiConfiguration> list = wifi.getConfiguredNetworks();
+		if (list == null) {
+			networkAdded.invoke(false);
+		    return;
+        }
+
 		int updateNetwork = -1;
 
 		// check if network config exists and it's hidden
@@ -419,6 +428,10 @@ public void getIP(final Callback callback) {
 	@ReactMethod
 	public void isRemoveWifiNetwork(String ssid, final Callback callback) {
 	    List<WifiConfiguration> mWifiConfigList = wifi.getConfiguredNetworks();
+        if (mWifiConfigList == null) {
+            return;
+        }
+
 	    for (WifiConfiguration wifiConfig : mWifiConfigList) {
 			String comparableSSID = ('"' + ssid + '"'); //Add quotes because wifiConfig.SSID has them
 			if(wifiConfig.SSID.equals(comparableSSID)) {
@@ -464,6 +477,10 @@ public static String longToIP(int longIp){
 
 	private WifiConfiguration IsExist(String SSID) {
 		List<WifiConfiguration> existingConfigs = wifi.getConfiguredNetworks();
+		if (existingConfigs == null) {
+			return null;
+		}
+
 		for (WifiConfiguration existingConfig : existingConfigs) {
 			if (existingConfig.SSID.equals("\"" + SSID + "\"")) {
 				return existingConfig;