Added standby bucket names

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

@@ -26,6 +26,7 @@ import android.Manifest;
 import android.app.Activity;
 import android.app.ActivityManager;
 import android.app.KeyguardManager;
+import android.app.usage.UsageStatsManager;
 import android.content.ActivityNotFoundException;
 import android.content.ComponentName;
 import android.content.ContentResolver;
@@ -546,6 +547,23 @@ public class Helper {
         }
     }
 
+    static String getStandbyBucketName(int bucket) {
+        switch (bucket) {
+            case UsageStatsManager.STANDBY_BUCKET_ACTIVE:
+                return "active";
+            case UsageStatsManager.STANDBY_BUCKET_WORKING_SET:
+                return "workingset";
+            case UsageStatsManager.STANDBY_BUCKET_FREQUENT:
+                return "frequent";
+            case UsageStatsManager.STANDBY_BUCKET_RARE:
+                return "rare";
+            case UsageStatsManager.STANDBY_BUCKET_RESTRICTED:
+                return "restricted";
+            default:
+                return Integer.toString(bucket);
+        }
+    }
+
     // View
 
     static Intent getChooser(Context context, Intent intent) {

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

@@ -1766,7 +1766,9 @@ public class Log {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
             UsageStatsManager usm = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);
             int bucket = usm.getAppStandbyBucket();
-            sb.append(String.format("Standby bucket: %d\r\n", bucket));
+            boolean inactive = usm.isAppInactive(BuildConfig.APPLICATION_ID);
+            sb.append(String.format("Standby bucket: %d-%s;p inactive: %b\r\n",
+                    bucket, Helper.getStandbyBucketName(bucket), inactive));
         }
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P)