package com.loulijun.md5demo;
import java.security.MessageDigest;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MD5Demo extendsActivity {
privateEditText username, password;
privateButton savebtn, loginbtn;
String user, pass;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
username = (EditText) findViewById(R.id.username);
password = (EditText) findViewById(R.id.password);
savebtn = (Button) findViewById(R.id.save);
loginbtn = (Button) findViewById(R.id.login);
savebtn.setOnClickListener(newButton.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences pre = getSharedPreferences("loginvalue",
MODE_WORLD_WRITEABLE);
pass = MD5(password.getText().toString());
user = username.getText().toString();
if (!pass.equals("") && !user.equals("")) {
pre.edit()
.putString("username",
username.getText().toString())
.putString("password", encryptmd5(pass)).commit();
Toast.makeText(getApplicationContext(),"保存成功!",
Toast.LENGTH_SHORT).show();
} else{
Toast.makeText(getApplicationContext(),"密码不能为空！",
Toast.LENGTH_LONG).show();
}
}
});
loginbtn.setOnClickListener(newButton.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences sp = getSharedPreferences("loginvalue",
MODE_WORLD_READABLE);
String loginuser = sp.getString("username",null);
String loginpass = sp.getString("password",null);
user = username.getText().toString();
pass = password.getText().toString();
String passmd5 = MD5(pass);
String encryptmd5 = encryptmd5(passmd5);
System.out.println("username="+ loginuser
+ "-------------password="+ loginpass);
System.out.println("user=="+ user
+ "-------------encryptmd5=="+ encryptmd5);
if (!user.equals("") && !pass.equals("")) {
if (user.equals(loginuser) && encryptmd5.equals(loginpass)) {
Intent intent = new Intent();
intent.setClass(MD5Demo.this, Login.class);
MD5Demo.this.startActivity(intent);
finish();
} else{
Toast.makeText(getApplicationContext(),"密码是错误的！",
Toast.LENGTH_LONG).show();
}
} else{
Toast.makeText(getApplicationContext(),"密码不能为空！",
Toast.LENGTH_LONG).show();
}
}
});
}
public static String MD5(String str) {
MessageDigest md5 =null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch(Exception e) {
e.printStackTrace();
return "";
}
char[] charArray = str.toCharArray();
byte[] byteArray =new byte[charArray.length];
for (int i = 0; i < charArray.length; i++) {
byteArray[i] = (byte) charArray[i];
}
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue =new StringBuffer();
for (int i = 0; i < md5Bytes.length; i++) {
int val = ((int) md5Bytes[i]) &0xff;
if (val < 16) {
hexValue.append("0");
}
hexValue.append(Integer.toHexString(val));
}
returnhexValue.toString();
}
publicstatic String encryptmd5(String str) {
char[] a = str.toCharArray();
for (int i = 0; i < a.length; i++) {
a[i] = (char) (a[i] ^‘l‘);
}
String s = new String(a);
returns;
}
}
