feat: runtime.loadJar() cache dex

common/src/main/java/com/stardust/pio/PFiles.java

@@ -395,6 +395,19 @@ public class PFiles {
         return file.delete();
     }
 
+    public static boolean deleteFilesOfDir(File dir) {
+        if (!dir.isDirectory())
+            throw new IllegalArgumentException("not a directory: " + dir);
+        File[] children = dir.listFiles();
+        if (children != null) {
+            for (File child : children) {
+                if (!deleteRecursively(child))
+                    return false;
+            }
+        }
+        return true;
+    }
+
     public static boolean remove(String path) {
         return new File(path).delete();
     }

common/src/main/java/com/stardust/util/MD5.java

@@ -0,0 +1,26 @@
+package com.stardust.util;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+public class MD5 {
+
+    public static byte[] md5Bytes(String message) throws NoSuchAlgorithmException {
+        MessageDigest md5 = MessageDigest.getInstance("MD5");
+        md5.update(message.getBytes());
+        return md5.digest();
+    }
+
+    public static String md5(String message) throws NoSuchAlgorithmException {
+        byte[] bytes = md5Bytes(message);
+        StringBuilder hexString = new StringBuilder(32);
+        for (byte b : bytes) {
+            String hex = Integer.toHexString(0xFF & b);
+            if (hex.length() == 1) {
+                hexString.append('0');
+            }
+            hexString.append(hex);
+        }
+        return hexString.toString();
+    }
+}