public class LoginActivity extends Activity {

    private EditText username;

    private EditText userpassword;

    private CheckBox remember;

    private CheckBox autologin;

    private Button login;

    private SharedPreferences sp;

    private String userNameValue,passwordValue;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.login);

        // 初始化用户名、密码、记住密码、自动登录、登录按钮

        username = (EditText) findViewById(R.id.username);

        userpassword = (EditText) findViewById(R.id.userpassword);

        remember = (CheckBox) findViewById(R.id.remember);

        autologin = (CheckBox) findViewById(R.id.autologin);

        login = (Button) findViewById(R.id.login);

        sp = getSharedPreferences("userInfo", );

        String name=sp.getString("USER_NAME", "");

        String pass =sp.getString("PASSWORD", "");

        boolean choseRemember =sp.getBoolean("remember", false);

        boolean choseAutoLogin =sp.getBoolean("autologin", false);

  //      Toast.makeText(this, name, Toast.LENGTH_SHORT).show();

        //如果上次选了记住密码，那进入登录页面也自动勾选记住密码，并填上用户名和密码

        if(choseRemember){

            username.setText(name);

            userpassword.setText(pass);

            remember.setChecked(true);

        }

        //如果上次登录选了自动登录，那进入登录页面也自动勾选自动登录

        if(choseAutoLogin){

            autologin.setChecked(true);

        }

        login.setOnClickListener(new OnClickListener() {

            // 默认可登录帐号tinyphp,密码123

            @Override

            public void onClick(View arg0) {

                userNameValue = username.getText().toString();

                passwordValue = userpassword.getText().toString();

                SharedPreferences.Editor editor =sp.edit();

                // TODO Auto-generated method stub

                if (userNameValue.equals("tinyphp")

                        && passwordValue.equals("")) {

                    Toast.makeText(LoginActivity.this, "登录成功",

                            Toast.LENGTH_SHORT).show();

                    //保存用户名和密码

                    editor.putString("USER_NAME", userNameValue);

                    editor.putString("PASSWORD", passwordValue);

                    //是否记住密码

                    if(remember.isChecked()){

                        editor.putBoolean("remember", true);

                    }else{

                        editor.putBoolean("remember", false);

                    }

                    //是否自动登录

                        if(autologin.isChecked()){

                            editor.putBoolean("autologin", true);

                        }else{

                            editor.putBoolean("autologin", false);

                        }

                    editor.commit();

                    //跳转

                    Intent intent =new Intent(LoginActivity.this,SuccessActivity.class);

                    startActivity(intent);

                } else {

                    Toast.makeText(LoginActivity.this, "用户名或密码错误，请重新登录!",

                            Toast.LENGTH_SHORT).show();

                }

            }

        });

    }

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:padding="10dp" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="用户名：" />

    <EditText

        android:id="@+id/username"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:ems="10"

        android:inputType="textPersonName" >

    </EditText>

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="10dp"

        android:text="密码：" />

    <EditText

        android:id="@+id/userpassword"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:ems="10"

        android:inputType="textPassword" >

    </EditText>

    <CheckBox

        android:id="@+id/remember"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="记住密码" />

    <CheckBox

        android:id="@+id/autologin"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="自动登录" />

    <Button

        android:id="@+id/login"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="登录" />

</LinearLayout>