android: perf: speed up bytesToHex

chipweinberger · Jul 23, 2024 · b3fb846 · b3fb846
1 parent 51d3d24
commit b3fb846
Showing 1 changed file with 3 additions and 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
@@ -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();
  }