diff --git a/MainActivity.java b/MainActivity.java
deleted file mode 100644
index b2f7f42..0000000
--- a/MainActivity.java
+++ /dev/null
@@ -1,206 +0,0 @@
-package com.example.sparrownotes;
-
-import android.content.Intent;
-import android.os.Bundle;
-import android.text.method.HideReturnsTransformationMethod;
-import android.text.method.PasswordTransformationMethod;
-import android.view.View;
-import android.widget.Button;
-import android.widget.CheckBox;
-import android.widget.EditText;
-import android.widget.ImageView;
-import android.widget.TextView;
-import android.widget.Toast;
-
-import androidx.appcompat.app.AppCompatActivity;
-
-import com.example.sparrownotes.bean.UserBean;
-import com.example.sparrownotes.dao.UserDao;
-import com.example.sparrownotes.util.Constant;
-import com.example.sparrownotes.util.SharedPreferenceUtil;
-
-import java.util.List;
-
-import butterknife.BindView;
-import butterknife.ButterKnife;
-import butterknife.OnClick;
-
-/**
- * 登录页面
- * @author Horsen
- */
-public class MainActivity extends AppCompatActivity {
-
-    @BindView(R.id.img_icon)
-    ImageView imgIcon;
-    @BindView(R.id.check_auto_login)
-    CheckBox checkAutoLogin;
-    @BindView(R.id.check_remember_pwd)
-    CheckBox checkRememberPwd;
-    @BindView(R.id.text_forget_pwd)
-    TextView textForgetPwd;
-    @BindView(R.id.btn_login)
-    Button btnLogin;
-    @BindView(R.id.edit_username)
-    EditText editUsername;
-    @BindView(R.id.edit_password)
-    EditText editPassword;
-    @BindView(R.id.text_register)
-    TextView textRegister;
-    @BindView(R.id.check_hide_pwd)
-    CheckBox checkHidePwd;
-
-    private static final String TAG = "MainActivity";
-    private UserDao userDao;
-    private String textUserName;
-    private String textPassword;
-
-    private static boolean REMEMBER_PWD = false;
-    private static boolean AUTO_LOGIN = false;
-    SharedPreferenceUtil spu;
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_main);
-        ButterKnife.bind(this);
-        userDao = new UserDao(this);
-        spu = SharedPreferenceUtil.getInstance(this);
-    }
-
-    @Override
-    protected void onStart() {
-        super.onStart();
-        Intent intent = getIntent();
-        // 如果注册过
-        if (intent.getBooleanExtra(Constant.HAS_REGISTERED, false)) {
-            intent.removeExtra(Constant.HAS_REGISTERED);
-            editUsername.setText(spu.getString(Constant.USER_NAME));
-            editPassword.setText(spu.getString(Constant.PASSWORD));
-        } else {
-            // 如果勾选记住密码
-            if (spu.getBoolean(Constant.REMEMBER_PWD)) {
-                checkRememberPwd.setChecked(true);
-                editUsername.setText(spu.getString(Constant.USER_NAME));
-                editPassword.setText(spu.getString(Constant.PASSWORD));
-            } else {
-                editUsername.setText("");
-                editPassword.setText("");
-            }
-            // 如果勾选自动登录
-            if (spu.getBoolean(Constant.AUTO_LOGIN)) {
-                checkAutoLogin.setChecked(true);
-                Intent intentLogin = new Intent(MainActivity.this, HomeActivity.class);
-                startActivity(intentLogin);
-            }
-        }
-    }
-
-    @OnClick({R.id.check_auto_login, R.id.check_remember_pwd, R.id.btn_login, R.id.text_forget_pwd, R.id.text_register, R.id.check_hide_pwd})
-    public void onViewClicked(View view) {
-        switch (view.getId()) {
-            case R.id.check_auto_login:
-                // 勾选自动登录时自动勾选记住密码
-                if (checkAutoLogin.isChecked()) {
-                    checkRememberPwd.setChecked(true);
-                    AUTO_LOGIN = true;
-                    REMEMBER_PWD = true;
-                } else {
-                    AUTO_LOGIN = false;
-                }
-                break;
-            case R.id.check_remember_pwd:
-                // 勾掉记住密码时自动勾掉自动登录
-                if (!checkRememberPwd.isChecked()) {
-                    checkAutoLogin.setChecked(false);
-                    AUTO_LOGIN = false;
-                    REMEMBER_PWD = false;
-                } else {
-                    REMEMBER_PWD = true;
-                }
-                break;
-            case R.id.btn_login:
-                // 检查非空
-                if (isNotEmpty()) {
-                    // 获得用户输入
-                    getEditText();
-                    // 检查用户名密码
-                    if (checkUser()) {
-                        // 存入sp 用于接下来页面的显示
-                        spu.putBoolean(Constant.REMEMBER_PWD, REMEMBER_PWD);
-                        spu.putBoolean(Constant.AUTO_LOGIN, AUTO_LOGIN);
-                        spu.putString(Constant.USER_NAME, textUserName);
-                        spu.putString(Constant.PASSWORD, textPassword);
-                        spu.putInt(Constant.USER_ID, getUserID());
-                        Intent intentLogin = new Intent(MainActivity.this, HomeActivity.class);
-                        startActivity(intentLogin);
-                        finish();
-                    } else {
-                        Toast.makeText(this, "用户名或密码错误", Toast.LENGTH_SHORT).show();
-                    }
-                } else {
-                    Toast.makeText(this, "用户名或密码不能为空", Toast.LENGTH_SHORT).show();
-                }
-                break;
-            case R.id.text_forget_pwd:
-                // 忘记密码
-                Intent intentFind = new Intent(MainActivity.this, FindPwdActivity.class);
-                startActivity(intentFind);
-                break;
-            case R.id.text_register:
-                // 注册
-                Intent intentRegister = new Intent(MainActivity.this, RegisterActivity.class);
-                startActivity(intentRegister);
-                break;
-            case R.id.check_hide_pwd:
-                if (checkHidePwd.isChecked()) {
-                    // 将密码显示出来
-                    editPassword.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
-                } else {
-                    // 隐藏密码
-                    editPassword.setTransformationMethod(PasswordTransformationMethod.getInstance());
-                }
-                // 将光标移动到文本最后
-                editPassword.setSelection(editPassword.getText().toString().length());
-                break;
-            default:
-                break;
-        }
-    }
-
-    /**
-     * 检验输入非空
-     *
-     * @return
-     */
-    public boolean isNotEmpty() {
-        return !"".equals(editUsername.getText().toString()) &&
-                !"".equals(editPassword.getText().toString());
-    }
-
-    /**
-     * 从控件中得到输入值
-     */
-    public void getEditText() {
-        textUserName = editUsername.getText().toString();
-        textPassword = editPassword.getText().toString();
-    }
-
-    /**
-     * 验证用户名密码
-     */
-    public boolean checkUser() {
-        List<UserBean> userBeans = userDao.queryByUserNameAndPassword(textUserName, textPassword);
-        return userBeans.size() != 0;
-    }
-
-    /**
-     * 获得用户ID
-     *
-     * @return
-     */
-    public int getUserID() {
-        List<UserBean> userBeans = userDao.queryByUserNameAndPassword(textUserName, textPassword);
-        return userBeans.get(0).getUserID();
-    }
-}
\ No newline at end of file