• API > 16
• Since Android 6, you are able to configure WifiNetworks that your app has created, you cannot edit wifi configurations from others apps.

• Add this on your root build.gradle of your project:

   allprojects {
   		repositories {
   			...
   			maven { url 'https://jitpack.io' }
   		}
   	}
  

• And add the dependency:

   compile 'com.github.jflavio1:WifiConnector:v1.0'
  

• Add to you build file

   <repositories>
   		<repository>
   		    <id>jitpack.io</id>
   		    <url>https://jitpack.io</url>
   		</repository>
   	</repositories>
  

• And the dependency

   <dependency>
   	    <groupId>com.github.jflavio1</groupId>
   	    <artifactId>WifiConnector</artifactId>
   	    <version>v1.0</version>
   	</dependency>
  

	// third and fith parameters could be null
	WifiConnector connector = new WifiConnector(this, "NEW_SSID", "NEW_BSSID", "WEP", "wifiPassword");
	connector.connectToWifi(new WifiConnector.ConnectionResultListener() {
	    @Override
                public void successfulConnect(String SSID) {
                    // toast!
                }

                @Override
                public void errorConnect(int codeReason) {
                    // toast!
                }

                @Override
                public void onStateChange(SupplicantState supplicantState) {
		// update UI!
                }
	});

WifiConnector instance must be implemented on Service or IntentService Remember, you have to put these permissions on your Manifest:

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

All tests and suggestions are well received.