Refactoring

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

@@ -416,6 +416,23 @@ public class ConnectionHelper {
                 message.contains("requires valid address");
     }
 
+    static boolean isDataSaving(Context context) {
+        // https://developer.android.com/training/basics/network-ops/data-saver.html
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N)
+            return false;
+
+        ConnectivityManager cm =
+                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+        if (cm == null)
+            return false;
+
+        // RESTRICT_BACKGROUND_STATUS_DISABLED: Data Saver is disabled.
+        // RESTRICT_BACKGROUND_STATUS_ENABLED: The user has enabled Data Saver for this app. (Globally)
+        // RESTRICT_BACKGROUND_STATUS_WHITELISTED: The user has enabled Data Saver but the app is allowed to bypass it.
+        int status = cm.getRestrictBackgroundStatus();
+        return (status == ConnectivityManager.RESTRICT_BACKGROUND_STATUS_ENABLED);
+    }
+
     static boolean vpnActive(Context context) {
         ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
         if (cm == null)

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

@@ -559,20 +559,14 @@ public class FragmentSetup extends FragmentBase {
         tvDozeDone.setCompoundDrawablesWithIntrinsicBounds(ignoring == null || ignoring ? check : null, null, null, null);
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
-            ActivityManager am = (ActivityManager) getContext().getSystemService(Context.ACTIVITY_SERVICE);
-            grpBackgroundRestricted.setVisibility(am.isBackgroundRestricted() ? View.VISIBLE : View.GONE);
+            ActivityManager am =
+                    (ActivityManager) getContext().getSystemService(Context.ACTIVITY_SERVICE);
+            grpBackgroundRestricted.setVisibility(am.isBackgroundRestricted()
+                    ? View.VISIBLE : View.GONE);
         }
 
-        // https://developer.android.com/training/basics/network-ops/data-saver.html
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-            ConnectivityManager cm = (ConnectivityManager) getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
-            if (cm != null) {
-                int status = cm.getRestrictBackgroundStatus();
-                grpDataSaver.setVisibility(
-                        status == ConnectivityManager.RESTRICT_BACKGROUND_STATUS_ENABLED
-                                ? View.VISIBLE : View.GONE);
-            }
-        }
+        grpDataSaver.setVisibility(ConnectionHelper.isDataSaving(getContext())
+                ? View.VISIBLE : View.GONE);
     }
 
     @Override

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

@@ -1727,11 +1727,8 @@ public class Log {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P)
             sb.append(String.format("Background restricted: %b\r\n", am.isBackgroundRestricted()));
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-            ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
-            boolean saving = (cm.getRestrictBackgroundStatus() == ConnectivityManager.RESTRICT_BACKGROUND_STATUS_ENABLED);
-            sb.append(String.format("Data saving: %b\r\n", saving));
-        }
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
+            sb.append(String.format("Data saving: %b\r\n", ConnectionHelper.isDataSaving(context)));
 
         String charset = MimeUtility.getDefaultJavaCharset();
         sb.append(String.format("Default charset: %s/%s\r\n", charset, MimeUtility.mimeCharset(charset)));