我的应用程序应该从 EditText 字段接收用户名和密码，使用 base64 对其进行加密并将它们存储在 sharedPreferences 中，它无法正常工作。该程序编译并运行没有错误，但不加密数据。数据以明文形式存储。不知道我在哪里出错了这段代码。
代码：
public void onClick(View arg0) {
user=rName.getText().toString().trim();
pass=rPwd.getText().toString().trim();
if(arg0==regBttn){
if((user.length()!=0))
{
if((pass.length()!=0))
{
sp=getSharedPreferences("AccessApp",MODE_WORLD_WRITEABLE);
Editor myEditor=sp.edit();
try {
myEditor.putString("USERNAME_KEY", user);
byte[ ] superSecretKeyBytes = Base64.decode(user);
byte[] key = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6 };
for (int i = 0; i < pass.length(); i++) {
key[i] = superSecretKeyBytes[i];
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
myEditor.putString("PASSWORD_KEY", pass);
byte[ ] superSecretKeyBytes = Base64.decode(pass);
byte[] key = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6 };
for (int i = 0; i < pass.length(); i++) {
key[i] = superSecretKeyBytes[i];
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
myEditor.commit();
Toast.makeText(this, "Registration is successfull",10000).show();
i=new Intent(this,AccessApp.class);
startActivity(i);
}
else
{
Toast.makeText(this, "Please Enter password", 10000).show();
}
}
else{
Toast.makeText(this,"Please Enter Username",10000).show();
}
}
else if(arg0==rtnBttn){
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setTitle("Exit");
builder.setMessage("Do you want to exit");
builder.setCancelable(false);
builder.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
finish();
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
arg0.cancel();
}
});
AlertDialog alert=builder.create();
alert.show();
}
}
public String encrypt(String toencrypt, byte key[]) throws Exception {
SecretKeySpec secret = new SecretKeySpec(key, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, secret);
byte[] encryptedbytes = cipher.doFinal(toencrypt.getBytes());
String encrypted = Base64.encodeBytes(encryptedbytes);
return encrypted;
}