Run lifecycle events on main thread

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -828,6 +828,7 @@ public class ServiceSynchronize extends LifecycleService {
                             folders.put(folder, null);
 
                         final TwoStateOwner cowner = new TwoStateOwner(ServiceSynchronize.this, folder.name);
+                        cowner.start();
 
                         new Handler(getMainLooper()).post(new Runnable() {
                             @Override
@@ -914,7 +915,6 @@ public class ServiceSynchronize extends LifecycleService {
                                         }
                                     }
                                 });
-                                cowner.start();
                             }
                         });
 
@@ -1000,13 +1000,8 @@ public class ServiceSynchronize extends LifecycleService {
                     db.account().setAccountError(account.id, Helper.formatThrowable(ex));
                 } finally {
                     // Stop watching for operations
-                    new Handler(getMainLooper()).post(new Runnable() {
-                        @Override
-                        public void run() {
-                            for (TwoStateOwner owner : cowners)
-                                owner.stop();
-                        }
-                    });
+                    for (TwoStateOwner owner : cowners)
+                        owner.destroy();
 
                     // Update state
                     EntityLog.log(this, account.name + " closing");

app/src/main/java/eu/faircode/email/TwoStateOwner.java

@@ -1,5 +1,8 @@
 package eu.faircode.email;
 
+import android.os.Handler;
+import android.os.Looper;
+
 import androidx.annotation.NonNull;
 import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.LifecycleObserver;
@@ -10,15 +13,17 @@ import androidx.lifecycle.OnLifecycleEvent;
 public class TwoStateOwner implements LifecycleOwner {
     private String name;
     private LifecycleRegistry registry;
+    private Handler handler;
 
     // https://developer.android.com/topic/libraries/architecture/lifecycle#lc
 
     TwoStateOwner(String aname) {
         name = aname;
 
-        // Initialize registry
+        // Initialize
         registry = new LifecycleRegistry(this);
-        registry.handleLifecycleEvent(Lifecycle.Event.ON_CREATE);
+        handler = new Handler(Looper.getMainLooper());
+        transition(Lifecycle.State.CREATED);
 
         // Logging
         registry.addObserver(new LifecycleObserver() {
@@ -45,11 +50,11 @@ public class TwoStateOwner implements LifecycleOwner {
     }
 
     void start() {
-        registry.handleLifecycleEvent(Lifecycle.Event.ON_START);
+        transition(Lifecycle.State.STARTED);
     }
 
     void stop() {
-        registry.handleLifecycleEvent(Lifecycle.Event.ON_STOP);
+        transition(Lifecycle.State.CREATED);
     }
 
     void restart() {
@@ -58,13 +63,35 @@ public class TwoStateOwner implements LifecycleOwner {
     }
 
     void destroy() {
+        if (Looper.myLooper() == Looper.getMainLooper())
+            _destroy();
+        else
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    _destroy();
+                }
+            });
+    }
+
+    void _destroy() {
         Lifecycle.State state = registry.getCurrentState();
-        if (state.equals(Lifecycle.State.INITIALIZED))
-            registry.handleLifecycleEvent(Lifecycle.Event.ON_CREATE);
-        if (state.equals(Lifecycle.State.STARTED))
-            registry.handleLifecycleEvent(Lifecycle.Event.ON_STOP); // transition to created
+        if (!state.equals(Lifecycle.State.CREATED))
+            registry.markState(Lifecycle.State.CREATED);
         if (!state.equals(Lifecycle.State.DESTROYED))
-            registry.handleLifecycleEvent(Lifecycle.Event.ON_DESTROY);
+            registry.markState(Lifecycle.State.DESTROYED);
+    }
+
+    private void transition(final Lifecycle.State state) {
+        if (Looper.myLooper() == Looper.getMainLooper())
+            registry.markState(state);
+        else
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    registry.markState(state);
+                }
+            });
     }
 
     @NonNull