android: Store the ID of the most recently used profile as preference

src/frontends/android/app/src/main/java/org/strongswan/android/logic/CharonVpnService.java

@@ -27,6 +27,7 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.ServiceConnection;
+import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.net.VpnService;
 import android.os.Build;
@@ -34,6 +35,7 @@ import android.os.Bundle;
 import android.os.Handler;
 import android.os.IBinder;
 import android.os.ParcelFileDescriptor;
+import android.preference.PreferenceManager;
 import android.security.KeyChain;
 import android.security.KeyChainException;
 import android.support.v4.app.NotificationCompat;
@@ -52,6 +54,7 @@ import org.strongswan.android.logic.imc.ImcState;
 import org.strongswan.android.logic.imc.RemediationInstruction;
 import org.strongswan.android.ui.MainActivity;
 import org.strongswan.android.ui.VpnProfileControlActivity;
+import org.strongswan.android.utils.Constants;
 import org.strongswan.android.utils.IPRange;
 import org.strongswan.android.utils.IPRangeSet;
 import org.strongswan.android.utils.SettingsWriter;
@@ -146,6 +149,10 @@ public class CharonVpnService extends VpnService implements Runnable, VpnStateSe
 					{
 						String password = bundle.getString(VpnProfileDataSource.KEY_PASSWORD);
 						profile.setPassword(password);
+
+						SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);
+						pref.edit().putString(Constants.PREF_MRU_VPN_PROFILE, profile.getUUID().toString())
+							.apply();
 					}
 				}
 				setNextProfile(profile);

src/frontends/android/app/src/main/java/org/strongswan/android/utils/Constants.java

@@ -53,4 +53,9 @@ public final class Constants
 	 * Value used to signify that the most recently used profile should be used as default
 	 */
 	public static final String PREF_DEFAULT_VPN_PROFILE_MRU = "pref_default_vpn_profile_mru";
+
+	/**
+	 * Preference key to store the most recently used VPN profile
+	 */
+	public static final String PREF_MRU_VPN_PROFILE = "pref_mru_vpn_profile";
 }