Implemented option to only use WiFi

app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     package="ch.dissem.apps.abit">
 
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
@@ -128,6 +129,13 @@
             <meta-data android:name="android.content.SyncAdapter"
                 android:resource="@xml/syncadapter" />
         </service>
+
+        <!-- Receive Wi-Fi connection state changes -->
+        <receiver android:name=".listener.WifiReceiver">
+            <intent-filter>
+                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
+            </intent-filter>
+        </receiver>
     </application>
 
 </manifest>