package com.example.myapi.md5;import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import com.example.myapi.R;import android.app.Activity;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MD5Activity extends Activity implements OnClickListener{    private Button btn_md5;    protected void onCreate(android.os.Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.md5);        btn_md5 = (Button)findViewById(R.id.md5_btn);        btn_md5.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch(v.getId()){        case R.id.md5_btn:            Toast.makeText(this, getMD5Str("123456"), Toast.LENGTH_LONG).show();//            getMD5Str("123456");            Log.e("md5", getMD5Str("123456"));            break;        }    };    /**     * MD5加密     * @param str 转换前的字符串     * @return 转换后的字符串     */    private String getMD5Str(String str) {                 MessageDigest messageDigest = null;                 try {                     //返回实现指定摘要算法的 MessageDigest对象 例如：MD5、SHA算法              messageDigest = MessageDigest.getInstance("MD5");                     messageDigest.reset(); //重置MessageDigest对象                    messageDigest.update(str.getBytes("UTF-8"));//指定byte数组更新            } catch (NoSuchAlgorithmException e) {                     System.out.println("NoSuchAlgorithmException caught!");                     System.exit(-1);                 } catch (UnsupportedEncodingException e) {                     e.printStackTrace();                 }               //完成哈希算法，完成后   MessageDigest对象被设为初始状态，而且该方法只能调用一次          byte[] byteArray = messageDigest.digest();           StringBuffer md5StrBuff = new StringBuffer();                 for (int i = 0; i < byteArray.length; i++) {                                 if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)                         md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));                     else                         md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));                 }               //16位加密，从第9位到25位  //          return md5StrBuff.substring(8, 24).toString().toUpperCase();          return md5StrBuff.toString();      }    }