Added option to disable double back

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

@@ -528,7 +528,9 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
             if (exit || count > 1)
                 super.onBackPressed();
             else if (!backHandled()) {
-                if (searching)
+                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getOriginalContext());
+                boolean double_back = prefs.getBoolean("double_back", true);
+                if (searching || !double_back)
                     super.onBackPressed();
                 else {
                     exit = true;

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

@@ -52,6 +52,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
     private TextView tvSubscriptionPro;
     private SwitchCompat swSubscribedOnly;
     private Spinner spBiometricsTimeout;
+    private SwitchCompat swDoubleBack;
     private SwitchCompat swEnglish;
     private SwitchCompat swWatchdog;
     private SwitchCompat swUpdates;
@@ -67,7 +68,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
     private Group grpDebug;
 
     private final static String[] RESET_OPTIONS = new String[]{
-            "badge", "subscriptions", "subscribed_only", "biometrics_timeout", "english", "watchdog", "updates", "crash_reports", "debug"
+            "badge", "subscriptions", "subscribed_only", "biometrics_timeout", "double_back", "english", "watchdog", "updates", "crash_reports", "debug"
     };
 
     private final static String[] RESET_QUESTIONS = new String[]{
@@ -89,6 +90,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
         tvSubscriptionPro = view.findViewById(R.id.tvSubscriptionPro);
         swSubscribedOnly = view.findViewById(R.id.swSubscribedOnly);
         spBiometricsTimeout = view.findViewById(R.id.spBiometricsTimeout);
+        swDoubleBack = view.findViewById(R.id.swDoubleBack);
         swEnglish = view.findViewById(R.id.swEnglish);
         swWatchdog = view.findViewById(R.id.swWatchdog);
         swUpdates = view.findViewById(R.id.swUpdates);
@@ -147,6 +149,13 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             }
         });
 
+        swDoubleBack.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("double_back", checked).apply();
+            }
+        });
+
         swEnglish.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
@@ -298,6 +307,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
                 break;
             }
 
+        swDoubleBack.setChecked(prefs.getBoolean("double_back", true));
         swEnglish.setChecked(prefs.getBoolean("english", false));
         swWatchdog.setChecked(prefs.getBoolean("watchdog", true));
         swUpdates.setChecked(prefs.getBoolean("updates", true));

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

@@ -110,6 +110,18 @@
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/tvBiometricsTimeout" />
 
+            <androidx.appcompat.widget.SwitchCompat
+                android:id="@+id/swDoubleBack"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="12dp"
+                android:checked="true"
+                android:text="@string/title_advanced_double_back"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@id/spBiometricsTimeout"
+                app:switchPadding="12dp" />
+
             <androidx.appcompat.widget.SwitchCompat
                 android:id="@+id/swEnglish"
                 android:layout_width="0dp"
@@ -118,7 +130,7 @@
                 android:text="@string/title_advanced_english"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintStart_toStartOf="parent"
-                app:layout_constraintTop_toBottomOf="@id/spBiometricsTimeout"
+                app:layout_constraintTop_toBottomOf="@id/swDoubleBack"
                 app:switchPadding="12dp" />
 
             <TextView

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

@@ -254,6 +254,7 @@
     <string name="title_advanced_subscriptions">Manage folder subscriptions</string>
     <string name="title_advanced_sync_subscribed">Synchronize subscribed folders only</string>
     <string name="title_advanced_biometrics_timeout">Biometric authentication timeout</string>
+    <string name="title_advanced_double_back">Double \'back\' to exit</string>
     <string name="title_advanced_english">Force English language</string>
     <string name="title_advanced_watchdog">Periodically check if FairEmail is still active</string>
     <string name="title_advanced_updates">Check for updates</string>