Added always active hint

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

@@ -41,6 +41,7 @@ import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
 import android.widget.ImageButton;
 import android.widget.ScrollView;
 import android.widget.Toast;
@@ -1238,8 +1239,19 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
         @NonNull
         @Override
         public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
+            LayoutInflater inflater = LayoutInflater.from(getContext());
+            View dview = inflater.inflate(R.layout.dialog_first, null);
+            Button btnInfo = dview.findViewById(R.id.btnInfo);
+
+            btnInfo.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    Helper.viewFAQ(getContext(), 39);
+                }
+            });
+
             return new AlertDialog.Builder(getContext())
-                    .setMessage(getString(R.string.title_hint_sync))
+                    .setView(dview)
                     .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                         @Override
                         public void onClick(DialogInterface dialog, int which) {

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

@@ -246,6 +246,7 @@ public class ApplicationEx extends Application {
         } else if (version < 978) {
             if (!prefs.contains("poll_interval"))
                 editor.putInt("poll_interval", 0);
+            editor.remove("first");
         }
 
         if (BuildConfig.DEBUG && false) {

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

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="24dp"
+    android:scrollbarStyle="outsideOverlay">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <TextView
+            android:id="@+id/tvImportant"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/title_hint_important"
+            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
+            android:textColor="?android:attr/textColorPrimary"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <TextView
+            android:id="@+id/tvSync"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/title_hint_sync"
+            android:textAppearance="@style/TextAppearance.AppCompat.Small"
+            android:textColor="?android:attr/textColorPrimary"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/tvImportant" />
+
+        <TextView
+            android:id="@+id/tvBattery"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/title_hint_battery"
+            android:textAppearance="@style/TextAppearance.AppCompat.Small"
+            android:textColor="?android:attr/textColorPrimary"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/tvSync" />
+
+        <Button
+            android:id="@+id/btnInfo"
+            style="?android:attr/buttonStyleSmall"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:minWidth="0dp"
+            android:minHeight="0dp"
+            android:text="@string/title_info"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/tvBattery" />
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</ScrollView>

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

@@ -1034,7 +1034,9 @@
     <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>
+    <string name="title_hint_important">Important</string>
     <string name="title_hint_sync">Downloading messages can take some time, depending on the speed of the provider, internet connection and device and on the number of messages. While downloading messages the app might respond slower.</string>
+    <string name="title_hint_battery">Since FairEmail by default always receives messages, Android will report FairEmail to be always active. Therefore it might look like that FairEmail is always using battery power, but in fact this is not the case.</string>
     <string name="title_hint_contact_actions">Long press for options</string>
     <string name="title_hint_eml">This is a summary of the content of a raw message file. Save the raw message with the save icon in the action bar to view all content.</string>