sdremote: disable wifi by default in the client

It can be still enabled, but it makes little sense to have it on by
default when the server is off by default.

Change-Id: I625f90fd67781244cc4fffa90127fd1c8707c580

android/sdremote/res/values/strings.xml

@@ -18,6 +18,8 @@
     <string name="options_description">Automatically decline all incoming calls.</string>
     <string name="options_volumeswitching">Volume Switching</string>
     <string name="options_volumeswitching_descripton">Change slides using volume buttons</string>
+    <string name="options_enablewifi">Enable wireless</string>
+    <string name="options_enablewifi_descripton">Try to connect to the computer over wireless</string>
     <string name="options_switchcomputer">Switch computer</string>
     <string name="blankscreen_return">Return to Slide</string>
     <string name="bluetooth">Bluetooth</string>

android/sdremote/res/xml/preferences.xml

@@ -8,6 +8,12 @@
         android:summary="@string/options_volumeswitching_descripton"
         android:title="@string/options_volumeswitching" />
 
+    <CheckBoxPreference
+        android:defaultValue="false"
+        android:key="option_enablewifi"
+        android:summary="@string/options_enablewifi_descripton"
+        android:title="@string/options_enablewifi" />
+
     <Preference
         android:key="option_switchcomputer"
         android:title="@string/options_switchcomputer" />

android/sdremote/src/org/libreoffice/impressremote/communication/CommunicationService.java

@@ -23,6 +23,7 @@ import android.content.SharedPreferences;
 import android.content.SharedPreferences.Editor;
 import android.os.Binder;
 import android.os.IBinder;
+import android.preference.PreferenceManager;
 import android.support.v4.content.LocalBroadcastManager;
 
 public class CommunicationService extends Service implements Runnable {
@@ -125,7 +126,10 @@ public class CommunicationService extends Service implements Runnable {
     private boolean mBluetoothPreviouslyEnabled;
 
     public void startSearching() {
-        mNetworkFinder.startFinding();
+        SharedPreferences aPref = PreferenceManager.getDefaultSharedPreferences(this);
+        boolean bEnableWifi = aPref.getBoolean("option_enablewifi", false);
+        if (bEnableWifi)
+            mNetworkFinder.startFinding();
         BluetoothAdapter aAdapter = BluetoothAdapter.getDefaultAdapter();
         if (aAdapter != null) {
             mBluetoothPreviouslyEnabled = aAdapter.isEnabled();