Added airplane mode warning

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

@@ -255,6 +255,7 @@ import me.everything.android.ui.overscroll.adapters.RecyclerViewOverScrollDecorA
 public class FragmentMessages extends FragmentBase implements SharedPreferences.OnSharedPreferenceChangeListener {
     private ViewGroup view;
     private SwipeRefreshLayoutEx swipeRefresh;
+    private TextView tvAirplane;
     private TextView tvSupport;
     private ImageButton ibHintSupport;
     private ImageButton ibHintSwipe;
@@ -276,6 +277,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
     private TextViewAutoCompleteAction etSearch;
     private BottomNavigationView bottom_navigation;
     private ContentLoadingProgressBar pbWait;
+    private Group grpAirplane;
     private Group grpSupport;
     private Group grpHintSupport;
     private Group grpHintSwipe;
@@ -512,6 +514,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
 
         // Get controls
         swipeRefresh = view.findViewById(R.id.swipeRefresh);
+        tvAirplane = view.findViewById(R.id.tvAirplane);
         tvSupport = view.findViewById(R.id.tvSupport);
         ibHintSupport = view.findViewById(R.id.ibHintSupport);
         ibHintSwipe = view.findViewById(R.id.ibHintSwipe);
@@ -534,6 +537,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         bottom_navigation = view.findViewById(R.id.bottom_navigation);
 
         pbWait = view.findViewById(R.id.pbWait);
+        grpAirplane = view.findViewById(R.id.grpAirplane);
         grpSupport = view.findViewById(R.id.grpSupport);
         grpHintSupport = view.findViewById(R.id.grpHintSupport);
         grpHintSwipe = view.findViewById(R.id.grpHintSwipe);
@@ -565,6 +569,16 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
             }
         });
 
+        grpAirplane.setVisibility(View.GONE);
+        tvAirplane.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(android.provider.Settings.ACTION_AIRPLANE_MODE_SETTINGS)
+                        .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                v.getContext().startActivity(intent);
+            }
+        });
+
         grpSupport.setVisibility(View.GONE);
         tvSupport.setOnClickListener(new View.OnClickListener() {
             @Override
@@ -4396,6 +4410,9 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         builder.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET);
         cm.registerNetworkCallback(builder.build(), networkCallback);
 
+        updateAirplaneMode(ConnectionHelper.airplaneMode(getContext()));
+        getContext().registerReceiver(airplanemode, new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED));
+
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
         boolean compact = prefs.getBoolean("compact", false);
         int zoom = prefs.getInt("view_zoom", compact ? 0 : 1);
@@ -4455,6 +4472,8 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
         prefs.unregisterOnSharedPreferenceChangeListener(this);
 
+        getContext().unregisterReceiver(airplanemode);
+
         ConnectivityManager cm = Helper.getSystemService(getContext(), ConnectivityManager.class);
         cm.unregisterNetworkCallback(networkCallback);
 
@@ -4497,11 +4516,25 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                         return;
                     if (!rvMessage.isComputingLayout())
                         adapter.checkInternet();
+                    updateAirplaneMode(ConnectionHelper.airplaneMode(getContext()));
                 }
             });
         }
     };
 
+    private BroadcastReceiver airplanemode = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            boolean on = intent.getBooleanExtra("state", false);
+            updateAirplaneMode(on);
+        }
+    };
+
+    private void updateAirplaneMode(boolean on) {
+        on = on && !ConnectionHelper.getNetworkState(getContext()).isConnected();
+        grpAirplane.setVisibility(on ? View.VISIBLE : View.GONE);
+    }
+
     private boolean checkDoze() {
         if (viewType != AdapterMessage.ViewType.UNIFIED)
             return false;

app/src/main/res/drawable/twotone_flight_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"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M10,19l-2,1.5V22l3.5,-1 3.5,1v-1.5L13,19v-5.5l8,2.5v-2l-8,-5V3.5c0,-0.83 -0.67,-1.5 -1.5,-1.5S10,2.67 10,3.5V9l-8,5v2l8,-2.5V19z"/>
+</vector>

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

@@ -16,6 +16,30 @@
             android:layout_width="match_parent"
             android:layout_height="match_parent">
 
+            <eu.faircode.email.FixedTextView
+                android:id="@+id/tvAirplane"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center_vertical"
+                android:drawableStart="@drawable/twotone_flight_24"
+                android:drawablePadding="6dp"
+                android:drawableTint="?android:attr/textColorPrimary"
+                android:padding="6dp"
+                android:text="@string/title_hint_airplane"
+                android:textAppearance="@style/TextAppearance.AppCompat.Small"
+                android:textColor="?android:attr/textColorPrimary"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="parent" />
+
+            <View
+                android:id="@+id/vSeparatorAirplane"
+                android:layout_width="match_parent"
+                android:layout_height="1dp"
+                android:background="?attr/colorSeparator"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@id/tvAirplane" />
+
             <eu.faircode.email.FixedTextView
                 android:id="@+id/tvSupport"
                 android:layout_width="wrap_content"
@@ -26,7 +50,7 @@
                 android:textAppearance="@style/TextAppearance.AppCompat.Small"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintStart_toStartOf="parent"
-                app:layout_constraintTop_toTopOf="parent" />
+                app:layout_constraintTop_toBottomOf="@+id/vSeparatorAirplane" />
 
             <View
                 android:id="@+id/vSeparatorSupport"
@@ -399,6 +423,12 @@
                 app:layout_constraintStart_toStartOf="parent"
                 app:menu="@menu/action_messages" />
 
+            <androidx.constraintlayout.widget.Group
+                android:id="@+id/grpAirplane"
+                android:layout_width="0dp"
+                android:layout_height="0dp"
+                app:constraint_referenced_ids="tvAirplane,vSeparatorAirplane" />
+
             <androidx.constraintlayout.widget.Group
                 android:id="@+id/grpSupport"
                 android:layout_width="0dp"

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

@@ -1778,6 +1778,7 @@
 
     <string name="title_hint_folder_actions">Long press a folder for options, like adding a folder to the navigation menu for quick access</string>
     <string name="title_hint_folder_sync">To limit battery and network usage not all folders and not all messages will be synchronized by default</string>
+    <string name="title_hint_airplane">Airplane mode is on</string>
     <string name="title_hint_support">If you have a question or a problem, please use the support menu to get help</string>
     <string name="title_hint_message_actions">Swipe left to trash; Swipe right to archive (if available); The swipe actions can be configured in the account settings</string>
     <string name="title_hint_message_selection">Long press a message to start selecting multiple messages; Hold and swipe up or down to select more messages</string>