Added doze info button

FAQ.md

@@ -313,6 +313,7 @@ Fonts, sizes, colors, etc should be material design whenever possible.
 * [(172) How can I import contacts?](#user-content-faq172)
 * [(173) What is the difference between Play store / GitHub / F-Droid version?](#user-content-faq173)
 * [(174) Is auto discovery supported?](#user-content-faq174)
+* [(175) Why should battery optimizations be disabled?](#user-content-faq175)
 
 [I have another question.](#user-content-get-support)
 
@@ -3922,6 +3923,20 @@ There is no auto discovery for POP3.
 
 <br />
 
+<a name="faq175"></a>
+**(175) Why should battery optimizations be disabled?**
+
+If battery optimizations ([Doze mode](https://developer.android.com/training/monitoring-device-state/doze-standby)) are enabled,
+Android might stop the app, which will result in not sending and receiving messages anymore.
+
+It shouldn't be necessary to disable battery optimizations for Android version 11 or earlier,
+but unfortunately modifications by manufacturers often [require it anyway](https://dontkillmyapp.com/).
+
+For Android 12 or later, battery optimizations need to be disabled to receive push messages
+due to [strict foreground restrictions](https://developer.android.com/about/versions/12/foreground-services).
+If battery optimizations are enabled, the app will periodically check for messages.
+
+<br />
 
 <h2><a name="get-support"></a>Get support</h2>
 

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

@@ -94,6 +94,7 @@ public class FragmentSetup extends FragmentBase {
     private TextView tvDozeDone;
     private Button btnDoze;
     private TextView tvDoze12;
+    private ImageButton ibDoze;
 
     private Button btnInexactAlarms;
     private Button btnBackgroundRestricted;
@@ -160,6 +161,7 @@ public class FragmentSetup extends FragmentBase {
         tvDozeDone = view.findViewById(R.id.tvDozeDone);
         btnDoze = view.findViewById(R.id.btnDoze);
         tvDoze12 = view.findViewById(R.id.tvDoze12);
+        ibDoze = view.findViewById(R.id.ibDoze);
 
         btnInexactAlarms = view.findViewById(R.id.btnInexactAlarms);
         btnBackgroundRestricted = view.findViewById(R.id.btnBackgroundRestricted);
@@ -448,6 +450,13 @@ public class FragmentSetup extends FragmentBase {
             }
         });
 
+        ibDoze.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Helper.viewFAQ(v.getContext(), 175, true);
+            }
+        });
+
         tvStamina.setPaintFlags(tvStamina.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);
         tvStamina.setOnClickListener(new View.OnClickListener() {
             @Override

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

@@ -715,6 +715,17 @@
                     app:layout_constraintStart_toStartOf="parent"
                     app:layout_constraintTop_toBottomOf="@id/tvDozeHint" />
 
+                <ImageButton
+                    android:id="@+id/ibDoze"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="12dp"
+                    android:contentDescription="@string/title_info"
+                    android:tooltipText="@string/title_info"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toBottomOf="@id/tvDoze12"
+                    app:srcCompat="@drawable/twotone_info_24" />
+
                 <eu.faircode.email.FixedTextView
                     android:id="@+id/tvInexactAlarms"
                     android:layout_width="wrap_content"
@@ -725,7 +736,7 @@
                     android:textColor="?attr/colorWarning"
                     android:textStyle="bold"
                     app:layout_constraintStart_toStartOf="parent"
-                    app:layout_constraintTop_toBottomOf="@id/tvDoze12" />
+                    app:layout_constraintTop_toBottomOf="@id/ibDoze" />
 
                 <eu.faircode.email.FixedTextView
                     android:id="@+id/tvInexactAlarmsWarning"