[android] #3960 - Return hex strings of SHA1 digests

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/telemetry/MapboxEventManager.java

@@ -243,7 +243,16 @@ public class MapboxEventManager {
                 messageDigest.reset();
                 messageDigest.update(string.getBytes("UTF-8"));
                 byte[] bytes = messageDigest.digest();
-                return new String(bytes);
+
+                // Get the Hex version of the digest
+                StringBuilder sb = new StringBuilder();
+                for (byte b : bytes) {
+                    sb.append( String.format("%02X", b) );
+                }
+                String hex = sb.toString();
+                Log.d(TAG, "original = " + string + "; hex = " + hex);
+
+                return hex;
             }
         } catch (Exception e) {
             Log.w(TAG, "Error encoding string, will return in original form." + e);