From b3fb84666de61546f9fa759ead7a630b3203cb9c Mon Sep 17 00:00:00 2001
From: Chip Weinberger <weinberger.c@gmail.com>
Date: Tue, 23 Jul 2024 21:37:52 +0800
Subject: [PATCH] android: perf: speed up bytesToHex

---
 .../com/lib/flutter_blue_plus/FlutterBluePlusPlugin.java     | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/android/src/main/java/com/lib/flutter_blue_plus/FlutterBluePlusPlugin.java b/android/src/main/java/com/lib/flutter_blue_plus/FlutterBluePlusPlugin.java
index efe80313..5c6b419a 100644
--- a/android/src/main/java/com/lib/flutter_blue_plus/FlutterBluePlusPlugin.java
+++ b/android/src/main/java/com/lib/flutter_blue_plus/FlutterBluePlusPlugin.java
@@ -2721,9 +2721,10 @@ private static String bytesToHex(byte[] bytes) {
         if (bytes == null) {
             return "";
         }
-        StringBuilder sb = new StringBuilder();
+        StringBuilder sb = new StringBuilder(bytes.length * 2);
         for (byte b : bytes) {
-            sb.append(String.format("%02x", b));
+            sb.append(Character.forDigit((b >> 4) & 0xF, 16));
+            sb.append(Character.forDigit(b & 0xF, 16));
         }
         return sb.toString();
     }