1 files changed, 67 insertions, 0 deletions
diff --git a/app/src/main/java/com/wuhei/reccoon/Formats.java b/app/src/main/java/com/wuhei/reccoon/Formats.java
new file mode 100644
index 0000000..37e0909
--- /dev/null
+++ b/app/src/main/java/com/wuhei/reccoon/Formats.java
@@ -0,0 +1,67 @@
+package com.wuhei.reccoon;
+
+import java.util.Locale;
+
+/** Small formatting helpers shared by the activities. */
+public final class Formats {
+
+    private Formats() {
+    }
+
+    /** Turns {@code reccoon-2026-09-24-153000-00001.wav} into a readable label. */
+    public static String prettyName(String fileName) {
+        if (fileName == null) {
+            return "";
+        }
+        String core = fileName;
+        if (core.startsWith("reccoon-")) {
+            core = core.substring("reccoon-".length());
+        }
+        if (core.endsWith(".wav")) {
+            core = core.substring(0, core.length() - 4);
+        }
+        String[] parts = core.split("-");
+        if (parts.length >= 4) {
+            String date = parts[0] + "-" + parts[1] + "-" + parts[2];
+            String time = parts[3];
+            String sequence = parts.length >= 5 ? parts[4] : "";
+            if (time.length() == 6) {
+                time = time.substring(0, 2) + ":" + time.substring(2, 4) + ":" + time.substring(4);
+            }
+            return date + "  " + time + (sequence.isEmpty() ? "" : "   #" + sequence);
+        }
+        return core;
+    }
+
+    public static String duration(long millis) {
+        long totalSeconds = Math.max(0, millis) / 1000;
+        long hours = totalSeconds / 3600;
+        long minutes = (totalSeconds % 3600) / 60;
+        long seconds = totalSeconds % 60;
+        if (hours > 0) {
+            return String.format(Locale.US, "%d:%02d:%02d", hours, minutes, seconds);
+        }
+        return String.format(Locale.US, "%d:%02d", minutes, seconds);
+    }
+
+    public static String size(long bytes) {
+        double mb = bytes / 1048576.0;
+        if (mb >= 1) {
+            return String.format(Locale.US, "%.1f MB", mb);
+        }
+        return String.format(Locale.US, "%d KB", bytes / 1024);
+    }
+
+    public static String humanBytes(long bytes) {
+        double mb = bytes / 1048576.0;
+        if (mb >= 1) {
+            return String.format(Locale.US, "%.0f MB", mb);
+        }
+        return String.format(Locale.US, "%.0f KB", bytes / 1024.0);
+    }
+
+    /** mm:ss or h:mm:ss from milliseconds. */
+    public static String clock(int millis) {
+        return duration(millis);
+    }
+}