All 3 flavors can be compiled.

app/build.gradle

@@ -40,7 +40,7 @@ android {
                 googlePlayFlavor
                         {
                             dimension "version"
-                            applicationIdSuffix ".googlePlay"
+//                            applicationIdSuffix ".googlePlay"
                             versionNameSuffix "-googlePlay"
                             targetSdkVersion 29
                         }
@@ -48,7 +48,7 @@ android {
                 fdroidFlavor
                         {
                             dimension "version"
-                            applicationIdSuffix ".fdroid"
+//                            applicationIdSuffix ".fdroid"
                             versionNameSuffix "-fdroid"
                             targetSdkVersion 28
                         }
@@ -56,7 +56,7 @@ android {
                 apkFlavor
                         {
                             dimension "version"
-                            applicationIdSuffix ".apk"
+//                            applicationIdSuffix ".apk"
                             versionNameSuffix "-apk"
                             targetSdkVersion 28
                         }

app/src/apkFlavor/java/com/jens/automation2/MyGoogleServicesInterface.java

@@ -1,16 +0,0 @@
-package com.jens.automation2;
-
-import com.google.android.gms.common.ConnectionResult;
-import com.google.android.gms.common.GoogleApiAvailability;
-
-public class MiscellaneousWithGoogleServices
-{
-    public static boolean isPlayServiceAvailable()
-    {
-        GoogleApiAvailability aa = new GoogleApiAvailability();
-        if(aa.isGooglePlayServicesAvailable(Miscellaneous.getAnyContext()) == ConnectionResult.SUCCESS)
-            return true;
-        else
-            return false;
-    }
-}

app/src/apkFlavor/java/com/jens/automation2/receivers/ActivityDetectionReceiver.java

@@ -9,7 +9,6 @@ import android.util.Log;
 import com.google.android.gms.common.ConnectionResult;
 import com.google.android.gms.common.GooglePlayServicesUtil;
 import com.google.android.gms.common.api.GoogleApiClient;
-import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
 import com.google.android.gms.location.ActivityRecognition;
 import com.google.android.gms.location.ActivityRecognitionApi;
 import com.google.android.gms.location.ActivityRecognitionResult;
@@ -199,6 +198,15 @@ public class ActivityDetectionReceiver extends IntentService implements Automati
 		{
 			Miscellaneous.logEvent("e", "ActivityDetectionReceiver", "Error stopping ActivityDetectionReceiver: " + Log.getStackTraceString(ex), 3);
 		}
+	}
+
+	public static boolean isPlayServiceAvailable()
+	{
+		if(GooglePlayServicesUtil.isGooglePlayServicesAvailable(Miscellaneous.getAnyContext()) == ConnectionResult.SUCCESS)
+			return true;
+		else
+			return false;
+	}
 
 
 	@Override

app/src/googlePlayFlavor/java/com/jens/automation2/MyGoogleServicesInterface.java

@@ -1,16 +0,0 @@
-package com.jens.automation2;
-
-import com.google.android.gms.common.ConnectionResult;
-import com.google.android.gms.common.GoogleApiAvailability;
-
-public class MiscellaneousWithGoogleServices
-{
-    public static boolean isPlayServiceAvailable()
-    {
-        GoogleApiAvailability aa = new GoogleApiAvailability();
-        if(aa.isGooglePlayServicesAvailable(Miscellaneous.getAnyContext()) == ConnectionResult.SUCCESS)
-            return true;
-        else
-            return false;
-    }
-}

app/src/main/java/com/jens/automation2/ActivityManageSpecificRule.java

@@ -47,6 +47,8 @@ import java.util.Collections;
 
 public class ActivityManageSpecificRule extends Activity
 {
+	final static String activityDetectionClassPath = "com.jens.automation2.receivers.ActivityDetectionReceiver";
+
 	public Context context;
 	private Button cmdTriggerAdd, cmdActionAdd, cmdSaveRule;
 	private ListView triggerListView, actionListView;
@@ -536,7 +538,7 @@ public class ActivityManageSpecificRule extends Activity
 						{
 							try
 							{
-								Method m = Miscellaneous.getClassMethodReflective("ActivityDetectionReceiver", "isPlayServiceAvailable");
+								Method m = Miscellaneous.getClassMethodReflective(activityDetectionClassPath, "isPlayServiceAvailable");
 								if(m != null)
 								{
 									boolean available = (Boolean)m.invoke(null);
@@ -548,6 +550,8 @@ public class ActivityManageSpecificRule extends Activity
 									else
 										Toast.makeText(myContext, getResources().getString(R.string.triggerOnlyAvailableIfPlayServicesInstalled), Toast.LENGTH_LONG).show();
 								}
+								else
+									Miscellaneous.messageBox(getResources().getString(R.string.error), getResources().getString(R.string.featureNotInFdroidVersion), ActivityManageSpecificRule.this).show();
 							}
 							catch (IllegalAccessException | InvocationTargetException e)
 							{
@@ -921,7 +925,7 @@ public class ActivityManageSpecificRule extends Activity
 
 		alertDialog.setTitle(Miscellaneous.getAnyContext().getResources().getString(R.string.selectTypeOfActivity));
 
-		Method m = Miscellaneous.getClassMethodReflective("ActivityDetectionReceiver", "getAllDescriptions");
+		Method m = Miscellaneous.getClassMethodReflective(activityDetectionClassPath, "getAllDescriptions");
 		if(m != null)
 		{
 			String[] choices = new String[0];
@@ -933,12 +937,12 @@ public class ActivityManageSpecificRule extends Activity
 					@Override
 					public void onClick(DialogInterface dialog, int which)
 					{
-						Method m = Miscellaneous.getClassMethodReflective("ActivityDetectionReceiver", "getAllTypes");
+						Method m = Miscellaneous.getClassMethodReflective(activityDetectionClassPath, "getAllTypes");
 						if(m != null)
 						{
 							try
 							{
-								Integer[] choices = (Integer[])m.invoke(null);
+								int[] choices = (int[])m.invoke(null);
 
 								newTrigger.setActivityDetectionType(choices[which]);
 								ruleToEdit.getTriggerSet().add(newTrigger);

app/src/main/java/com/jens/automation2/Miscellaneous.java

@@ -48,6 +48,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.lang.Thread.UncaughtExceptionHandler;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
@@ -885,13 +886,13 @@ public class Miscellaneous extends Service
 
 	public static Method getClassMethodReflective(String className, String methodName)
 	{
-		Class atRecClass = null;
+		Class foundClass = null;
 		try
 		{
-			atRecClass = Class.forName("ActivityDetectionReceiver");
+			foundClass = Class.forName(className);
-			for(Method m : atRecClass.getMethods())
+			for(Method m : foundClass.getDeclaredMethods())
 			{
-				if(m.getName().equalsIgnoreCase("isPlayServiceAvailable"))
+				if(m.getName().equalsIgnoreCase(methodName))
 				{
 					return m;
 				}
@@ -904,4 +905,27 @@ public class Miscellaneous extends Service
 
 		return null;
 	}
+
+	public static Object runMethodReflective(String className, String methodName, Object[] params)
+	{
+		Method m = getClassMethodReflective(className, methodName);
+		Object result = null;
+		try
+		{
+			if(params == null)
+				result = m.invoke((Object[]) null);
+			else
+				result = m.invoke(null, params);
+		}
+		catch (IllegalAccessException e)
+		{
+			e.printStackTrace();
+		}
+		catch (InvocationTargetException e)
+		{
+			e.printStackTrace();
+		}
+
+		return result;
+	}
 }

app/src/main/java/com/jens/automation2/ReceiverCoordinator.java

@@ -1,5 +1,6 @@
 package com.jens.automation2;
 
+import android.os.Build;
 import android.util.Log;
 
 import com.jens.automation2.location.CellLocationChangedReceiver;
@@ -15,6 +16,13 @@ import com.jens.automation2.receivers.PhoneStatusListener;
 import com.jens.automation2.receivers.ProcessListener;
 import com.jens.automation2.receivers.TimeZoneListener;
 
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import androidx.annotation.RequiresApi;
+
+import static com.jens.automation2.ActivityManageSpecificRule.activityDetectionClassPath;
+
 /**
  * Created by jens on 08.03.2017.
  */
@@ -28,8 +36,15 @@ public class ReceiverCoordinator
 	 * - Accelerometer
 	 */
 
-    public static final Class[] allImplementers = {
+    public static Class[] allImplementers;
-            ActivityDetectionReceiver.class,
+
+    static void fillImplementers()
+    {
+        try
+        {
+            Class adClass = Class.forName("ActivityDetectionReceiver");
+            allImplementers = new Class[] {
+                    adClass,
                     AlarmListener.class,
                     BatteryReceiver.class,
                     BluetoothReceiver.class,
@@ -41,15 +56,38 @@ public class ReceiverCoordinator
                     ProcessListener.class,
                     TimeZoneListener.class
              };
+        }
+        catch (ClassNotFoundException e)
+        {
+            e.printStackTrace();
+
+            allImplementers = new Class[] {
+                    AlarmListener.class,
+                    BatteryReceiver.class,
+                    BluetoothReceiver.class,
+                    ConnectivityReceiver.class,
+                    HeadphoneJackListener.class,
+                    //NfcReceiver.class,
+                    NoiseListener.class,
+                    PhoneStatusListener.class,
+                    ProcessListener.class,
+                    TimeZoneListener.class
+            };
+        }
+    }
 
     private static AutomationListenerInterface[] listeners = null;
 
+    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
     public static void startAllReceivers()
     {
 		/*
 		 * New procedure:
 		 * Save instances of Listeners in ArrayList and run them.
 		 */
+
+        fillImplementers();
+
         try
         {
             if(listeners == null)
@@ -130,7 +168,10 @@ public class ReceiverCoordinator
 
         //startActivityDetectionReceiver
         if(Rule.isAnyRuleUsing(Trigger.Trigger_Enum.activityDetection))
-            ActivityDetectionReceiver.startActivityDetectionReceiver();
+        {
+            Miscellaneous.runMethodReflective(activityDetectionClassPath, "startActivityDetectionReceiver", null);
+//            ActivityDetectionReceiver.startActivityDetectionReceiver();
+        }
 
         //startBluetoothReceiver
         if(Rule.isAnyRuleUsing(Trigger.Trigger_Enum.bluetoothConnection))
@@ -153,7 +194,8 @@ public class ReceiverCoordinator
             AlarmListener.stopAlarmListener(AutomationService.getInstance());
             NoiseListener.stopNoiseListener();
             ProcessListener.stopProcessListener(AutomationService.getInstance());
-            ActivityDetectionReceiver.stopActivityDetectionReceiver();
+            Miscellaneous.runMethodReflective("ActivityDetectionReceiver", "stopActivityDetectionReceiver", null);
+//            ActivityDetectionReceiver.stopActivityDetectionReceiver();
             BluetoothReceiver.stopBluetoothReceiver();
             HeadphoneJackListener.getInstance().stopListener(AutomationService.getInstance());
         }
@@ -213,25 +255,32 @@ public class ReceiverCoordinator
 
         if(Rule.isAnyRuleUsing(Trigger.Trigger_Enum.activityDetection))
         {
-            if(ActivityDetectionReceiver.isActivityDetectionReceiverRunning())
+            boolean isRunning = (Boolean)Miscellaneous.runMethodReflective("ActivityDetectionReceiver", "isActivityDetectionReceiverRunning", null);
+            if(isRunning)
             {
                 Miscellaneous.logEvent("i", "LocationProvider", "Restarting ActivityDetectionReceiver because used in a new/changed rule.", 4);
-                if(ActivityDetectionReceiver.haveAllPermission())
+                boolean haveAllPerms = (Boolean)Miscellaneous.runMethodReflective("ActivityDetectionReceiver", "haveAllPermission", null);
-                    ActivityDetectionReceiver.restartActivityDetectionReceiver();
+                if(haveAllPerms)
+                    Miscellaneous.runMethodReflective("ActivityDetectionReceiver", "restartActivityDetectionReceiver", null);
+//                    ActivityDetectionReceiver.restartActivityDetectionReceiver();
             }
             else
             {
                 Miscellaneous.logEvent("i", "LocationProvider", "Starting ActivityDetectionReceiver because used in a new/changed rule.", 4);
-                if(ActivityDetectionReceiver.haveAllPermission())
+                boolean haveAllPerms = (Boolean)Miscellaneous.runMethodReflective("ActivityDetectionReceiver", "haveAllPermission", null);
-                    ActivityDetectionReceiver.startActivityDetectionReceiver();
+                if(haveAllPerms)
+                    Miscellaneous.runMethodReflective("ActivityDetectionReceiver", "startActivityDetectionReceiver", null);
+//                    ActivityDetectionReceiver.startActivityDetectionReceiver();
             }
         }
         else
         {
-            if(ActivityDetectionReceiver.isActivityDetectionReceiverRunning())
+            boolean isRunning = (Boolean)Miscellaneous.runMethodReflective("ActivityDetectionReceiver", "isActivityDetectionReceiverRunning", null);
+            if(isRunning)
             {
                 Miscellaneous.logEvent("i", "LocationProvider", "Shutting down ActivityDetectionReceiver because not used in any rule.", 4);
-                ActivityDetectionReceiver.stopActivityDetectionReceiver();
+                Miscellaneous.runMethodReflective("ActivityDetectionReceiver", "stopActivityDetectionReceiver", null);
+//                ActivityDetectionReceiver.stopActivityDetectionReceiver();
             }
         }
 

app/src/main/java/com/jens/automation2/Trigger.java

@@ -356,20 +356,20 @@ public class Trigger
 				if(ActivityPermissions.isPermissionDeclaratedInManifest(Miscellaneous.getAnyContext(), "com.google.android.gms.permission.ACTIVITY_RECOGNITION"))
 				{
 					// This type doesn't have an activate/deactivate equivalent, at least not yet.
-					try
+//					try
-					{
+//					{
-						Class activityDetection = Class.forName("com.jens.automation2.receivers.ActivityDetectionReceiver");
+						returnString.append(Miscellaneous.runMethodReflective(ActivityManageSpecificRule.activityDetectionClassPath, "getDescription", new Object[] { getActivityDetectionType() } ));
-						for(Method method : activityDetection.getMethods())
+//						for(Method method : activityDetection.getMethods())
-						{
+//						{
-							if(method.getName().equalsIgnoreCase("getDescription"))
+//							if(method.getName().equalsIgnoreCase("getDescription"))
-								returnString.append(method.invoke(getActivityDetectionType()));
+//								returnString.append(method.invoke());
-//							returnString.append(Miscellaneous.getAnyContext().getResources().getString(R.string.detectedActivity) + " " + activityDetection.getDescription(getActivityDetectionType()));
+////							returnString.append(Miscellaneous.getAnyContext().getResources().getString(R.string.detectedActivity) + " " + activityDetection.getDescription(getActivityDetectionType()));
-						}
+//						}
-					}
+//					}
-					catch (ClassNotFoundException | IllegalAccessException | InvocationTargetException e)
+//					catch (ClassNotFoundException | IllegalAccessException | InvocationTargetException e)
-					{
+//					{
-						e.printStackTrace();
+//						e.printStackTrace();
-					}
+//					}
 
 				}
 				else

app/src/main/res/values/strings.xml

@@ -597,4 +597,6 @@
     <string name="android.permission.ACCESS_BACKGROUND_LOCATION">Read location in background.</string>
     <string name="deviceDoesNotHaveBluetooth">This device does not seem to have bluetooth. You can still continue configuring this, but it will most likely not have an effect.</string>
     <string name="manageLocations">Create or edit locations</string>
+    <string name="error">Error</string>
+    <string name="featureNotInFdroidVersion">This feature is based on non-free software. Therefore is is not available in the F-Droid version.</string>
 </resources>