昨天老大叫我看看android加密算法。于是网上找了找，找到了AES加密算法。（当然还有MD5,BASE64什么的这篇文章列举了非常多，可是基本都是j2se平台的，android平台不一定支持，可是AES算法Android是自带了包的，从官方的http://developer.android.com/reference/javax/crypto/Cipher.html能够看到。）
AES加密算法是什么？大家能够自己去google，专家级程序猿写好包，project人员会用即可了。
这个样例事实上是来自。
src文件夹主文件：
package com.qq;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import android.app.Activity;import android.os.Bundle;import android.util.Log;public class SimpleCrypto extends Activity { public static String encrypt(String seed, String cleartext) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] result = encrypt(rawKey, cleartext.getBytes()); return toHex(result); } public static String decrypt(String seed, String encrypted) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] enc = toByte(encrypted); byte[] result = decrypt(rawKey, enc); return new String(result); } private static byte[] getRawKey(byte[] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.setSeed(seed); kgen.init(128, sr); // 192 and 256 bits may not be available SecretKey skey = kgen.generateKey(); byte[] raw = skey.getEncoded(); return raw; } private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted = cipher.doFinal(clear); return encrypted; } private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] decrypted = cipher.doFinal(encrypted); return decrypted; } public static String toHex(String txt) { return toHex(txt.getBytes()); } public static String fromHex(String hex) { return new String(toByte(hex)); } public static byte[] toByte(String hexString) { int len = hexString.length()/2; byte[] result = new byte[len]; for (int i = 0; i < len; i++) result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue(); return result; } public static String toHex(byte[] buf) { if (buf == null) return ""; StringBuffer result = new StringBuffer(2*buf.length); for (int i = 0; i < buf.length; i++) { appendHex(result, buf[i]); } return result.toString(); } private final static String HEX = "0123456789ABCDEF"; private static void appendHex(StringBuffer sb, byte b) { sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f)); } /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); String masterPassword = "a"; String originalText = "0123456789"; byte[] text = new byte[]{'0','1','2','3','4','5','6','7','8','9'}; byte[] password = new byte[]{'a'}; try { String encryptingCode = SimpleCrypto.encrypt(masterPassword,originalText);// System.out.println("加密结果为 " + encryptingCode); Log.i("加密结果为 ",encryptingCode); String decryptingCode = SimpleCrypto.decrypt(masterPassword, encryptingCode); System.out.println("解密结果为 " + decryptingCode); Log.i("解密结果",decryptingCode); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }} 布局文件main.xml和配置文件AndroidManifest.xml默认就好了。最后结果在Log里面看，利用adb logcat > d:\1.txt定位到D盘的1.txt文件，然后用记事本打开就，查找”加密结果为“就能够看到了： 执行结果（从log日志中看到的）：
I/加密结果为 ( 190): BFB77D8F1E1EE9D5E252926A12659DE8
I/解密结果( 190): 0123456789