Added pull down to refresh

Single folders only for now

FAQ.md

@@ -45,7 +45,6 @@ Anything on this list is in random order and *might* be added in the near future
 * Snooze timer: snoozed emails are not supported by [IMAP](https://en.wikipedia.org/wiki/Internet_Message_Access_Protocol).
 * Badge count: there is no standard Android API for this and third party solutions might stop working anytime.
 * Shortcut frequently contacted: Android [doesn't support this anymore](https://developer.android.com/guide/topics/providers/contacts-provider#ObsoleteData).
-* Pull down to refresh: new messages are received in real-time, so manual refreshing is not needed, see also [this FAQ](#user-content-faq2).
 * Switch language: although it is possible to change the language of an app, Android is not designed for this. Better fix the translation in your language if needed, see [this FAQ](#user-content-faq26) about how to.
 * Select identities to show in unified inbox: this would add complexity for something which would hardly be used.
 * Better design: please let me know what you have in mind [in this forum](https://forum.xda-developers.com/android/apps-games/source-email-t3824168).

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

@@ -135,7 +135,9 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
                 else
                     ivState.setImageResource(android.R.drawable.stat_sys_warning);
             } else {
-                if ("syncing".equals(folder.sync_state))
+                if ("requested".equals(folder.sync_state))
+                    ivState.setImageResource(R.drawable.baseline_hourglass_empty_24);
+                else if ("syncing".equals(folder.sync_state))
                     ivState.setImageResource(R.drawable.baseline_compare_arrows_24);
                 else if ("downloading".equals(folder.sync_state))
                     ivState.setImageResource(R.drawable.baseline_cloud_download_24);

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

@@ -92,8 +92,10 @@ public class EntityOperation {
     }
 
     static void sync(DB db, long folder) {
-        if (db.operation().getOperationCount(folder, EntityOperation.SYNC) == 0)
+        if (db.operation().getOperationCount(folder, EntityOperation.SYNC) == 0) {
             queue(db, folder, null, EntityOperation.SYNC, new JSONArray());
+            db.folder().setFolderSyncState(folder, "requested");
+        }
     }
 
     private static void queue(DB db, long folder, Long message, String name, JSONArray jargs) {

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

@@ -24,6 +24,7 @@ import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.graphics.Canvas;
+import android.graphics.Color;
 import android.graphics.drawable.Drawable;
 import android.net.ConnectivityManager;
 import android.os.Bundle;
@@ -31,6 +32,7 @@ import android.os.Handler;
 import android.preference.PreferenceManager;
 import android.text.TextUtils;
 import android.util.Log;
+import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -70,9 +72,11 @@ import androidx.recyclerview.selection.StorageStrategy;
 import androidx.recyclerview.widget.ItemTouchHelper;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
+import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
 
 public class FragmentMessages extends FragmentEx {
     private ViewGroup view;
+    private SwipeRefreshLayout swipeRefresh;
     private View popupAnchor;
     private TextView tvSupport;
     private ImageButton ibHintSupport;
@@ -168,6 +172,7 @@ public class FragmentMessages extends FragmentEx {
         setHasOptionsMenu(true);
 
         // Get controls
+        swipeRefresh = view.findViewById(R.id.swipeRefresh);
         popupAnchor = view.findViewById(R.id.popupAnchor);
         tvSupport = view.findViewById(R.id.tvSupport);
         ibHintSupport = view.findViewById(R.id.ibHintSupport);
@@ -189,6 +194,37 @@ public class FragmentMessages extends FragmentEx {
 
         // Wire controls
 
+        TypedValue tv = new TypedValue();
+        getContext().getTheme().resolveAttribute(R.attr.colorAccent, tv, true);
+        swipeRefresh.setColorSchemeColors(tv.data, tv.data, tv.data);
+        swipeRefresh.setProgressBackgroundColorSchemeColor(Color.WHITE);
+        swipeRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
+            @Override
+            public void onRefresh() {
+                Bundle args = new Bundle();
+                args.putLong("id", folder);
+                new SimpleTask<Void>() {
+                    @Override
+                    protected Void onLoad(Context context, Bundle args) {
+                        long id = args.getLong("id");
+
+                        DB db = DB.getInstance(context);
+                        try {
+                            db.beginTransaction();
+
+                            EntityOperation.sync(db, id);
+
+                            db.setTransactionSuccessful();
+                        } finally {
+                            db.endTransaction();
+                        }
+
+                        return null;
+                    }
+                }.load(FragmentMessages.this, args);
+            }
+        });
+
         tvSupport.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -977,6 +1013,7 @@ public class FragmentMessages extends FragmentEx {
         ((ActivityBase) getActivity()).addBackPressedListener(onBackPressedListener);
 
         // Initialize
+        swipeRefresh.setEnabled(viewType == AdapterMessage.ViewType.FOLDER);
         tvNoEmail.setVisibility(View.GONE);
         bottom_navigation.setVisibility(View.GONE);
         grpReady.setVisibility(View.GONE);
@@ -1072,6 +1109,8 @@ public class FragmentMessages extends FragmentEx {
                             outbox = EntityFolder.OUTBOX.equals(folder.type);
                             getActivity().invalidateOptionsMenu();
                         }
+
+                        swipeRefresh.setRefreshing(folder != null && folder.sync_state != null);
                     }
                 });
                 break;

app/src/main/res/drawable/baseline_hourglass_empty_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0"
+        android:tint="?attr/colorControlNormal">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M6,2v6h0.01L6,8.01 10,12l-4,4 0.01,0.01L6,16.01L6,22h12v-5.99h-0.01L18,16l-4,-4 4,-3.99 -0.01,-0.01L18,8L18,2L6,2zM16,16.5L16,20L8,20v-3.5l4,-4 4,4zM12,11.5l-4,-4L8,4h8v3.5l-4,4z"/>
+</vector>

app/src/main/res/layout/fragment_messages.xml

@@ -6,6 +6,11 @@
     android:layout_height="match_parent"
     tools:context=".ActivityView">
 
+    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+        android:id="@+id/swipeRefresh"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
         <androidx.constraintlayout.widget.ConstraintLayout
             android:layout_width="match_parent"
             android:layout_height="match_parent">
@@ -208,6 +213,8 @@
                 app:constraint_referenced_ids="rvFolder" />
         </androidx.constraintlayout.widget.ConstraintLayout>
 
+    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
+
     <com.google.android.material.floatingactionbutton.FloatingActionButton
         android:id="@+id/fabMore"
         android:layout_width="wrap_content"