Android实例开发中登录注册界面的框架实现（android studio）

清疚 2022-02-05 12:11 555阅读 0赞

## 小项目框架 ##

今天用QQ的时候想到了，不如用android studio 做一个类似于这样的登录软件。当然QQ的实现的功能特别复杂，UI界面也很多，不是单纯的一时新奇就可以做出来的。就是简单的实现了一些功能，做了三个界面；1.登录界面。2.注册界面。3.登陆后的界面。

## 功能描述 ##

登录按钮\------按钮实现跳转到下一个界面，并且判断输入的账号、密码是否符合规则（不为空），提示，登陆成功或失败  
注册按钮\------按钮实现跳转到注册界面

登录界面  
![在这里插入图片描述][20190506185251182.png]  
main\_activity.xml

注册界面  
确定注册\------按钮实现注册，判断以上四个注册信息是否符合规则，判断两次输入密码是否一样，并且不为空。并且显示提示信息  
返回登录\------按钮实现跳转到刚才的登录界面  
![在这里插入图片描述][20190506190259673.png]  
main\_activity.java

public class MainActivity extends AppCompatActivity {
        private EditText et_username;
        private EditText et_password;
        private EditText et_password2;
        private EditText et_mail;
        private Button btn_login;
        private Button btn_register;
        private CheckBox checkbox;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Map<String, String> userInfo = SaveInfo.getSaveInformation(this);
            if (userInfo != null) {
                et_username.setText(userInfo.get("username"));
                et_password.setText(userInfo.get("password"));
            }
            et_username =(EditText) findViewById(R.id.et_username);
            et_password =(EditText) findViewById(R.id.et_password);
            et_password2 =(EditText) findViewById(R.id.reg_password2);
            et_mail = (EditText) findViewById(R.id.reg_mail);
            checkbox = (CheckBox) findViewById(R.id.checkBox);
            btn_login =(Button) findViewById(R.id.button_login);
            btn_register =(Button) findViewById(R.id.button_register);
            btn_login.setOnClickListener(new MyButton());
            btn_register.setOnClickListener(new MyButton());
                        }
        public  class MyButton implements View.OnClickListener{
            @Override
            public void onClick(View view){
                String username =et_username.getText().toString().trim();
                String password =et_password.getText().toString().trim();
                switch (view.getId()) {
                    //当点击登录按钮时
                    case R.id.button_login:
                        if(TextUtils.isEmpty(username) || TextUtils.isEmpty(password)){
                            Toast.makeText(MainActivity.this,"密码或账号不能为空",Toast.LENGTH_SHORT).show();
                        } else {
                            if(checkbox.isChecked()){
                                //保存密码的操作
                            }
                            Toast.makeText(MainActivity.this,"登录成功",Toast.LENGTH_SHORT).show();
                                Intent intent = new Intent(MainActivity.this, LoginActivity.class);
                                startActivity(intent);
                            }
                        break;
                    //当点击注册按钮事件时
                    case R.id.button_register:
                        Intent intent = new Intent(MainActivity.this,RegisterActivity.class);
                        startActivity(intent);
                        break;
    
                }
            }
        }
                    }

registeractivity.java

public class RegisterActivity extends AppCompatActivity {
        private EditText reg_username;
        private EditText reg_password;
        private EditText reg_password2;
        private EditText reg_mail;
        private Button reg_btn_sure;
        private Button reg_btn_login;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_register);
            reg_username = (EditText) findViewById(R.id.reg_username);
            reg_password = (EditText) findViewById(R.id.reg_password);
            reg_password2 = (EditText) findViewById(R.id.reg_password2);
            reg_mail = (EditText) findViewById(R.id.reg_mail);
            reg_btn_sure = (Button) findViewById(R.id.reg_btn_sure);
            reg_btn_login = (Button) findViewById(R.id.reg_btn_login);
            reg_btn_sure.setOnClickListener(new RegisterButton());
            reg_btn_login.setOnClickListener(new RegisterButton());
        }
    
        public class RegisterButton implements View.OnClickListener {
            @Override
            public void onClick(View v) {
                String username = reg_username.getText().toString().trim();
                String password = reg_password.getText().toString().trim();
                String password2 = reg_password2.getText().toString().trim();
                String mail = reg_mail.getText().toString().trim();
                switch (v.getId()) {
                    //注册开始，判断注册条件
                    case R.id.reg_btn_sure:
                        if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password) || TextUtils.isEmpty(password2) || TextUtils.isEmpty(mail)) {
                            Toast.makeText(RegisterActivity.this, "各项均不能为空", Toast.LENGTH_SHORT).show();
                        } else {
                            if (TextUtils.equals(password, password2)) {
                                //执行注册操作
                                SaveInfo.SaveInformation(RegisterActivity.this,username,password,password2,mail);
                                Toast.makeText(RegisterActivity.this,"注册成功,请返回登录",Toast.LENGTH_SHORT).show();
                            } else {
                                Toast.makeText(RegisterActivity.this, "两次输入的密码不一样", Toast.LENGTH_SHORT).show();
                            }
                        }
                            break;
                            case R.id.reg_btn_login:
                                Intent intent = new Intent(RegisterActivity.this, MainActivity.class);
                                startActivity(intent);
                                break;
    
                        }
                }
            }
        }

登录成功界面创建一个布局文件就可以了，写上你想要的东西，我自己就是创建了一个布局，什么都没有，所以就在这里不写了  
在这里因为要做一个保存操作，所以创建了一个java工具类，其中定义了两个方法，一个保存登录名和密码，一个负责调用保存的登录名和密码  
saveinfo

public class SaveInfo {
        public static boolean SaveInformation(Context context, String username, String password, String password2, String mail) {
            try {
                FileOutputStream fos = context.openFileOutput("data.txt", Context.MODE_APPEND);
                fos.write(("用户名:" + username + " 密码:" + password + "邮箱：" + mail).getBytes());
                fos.close();
                return true;
            } catch (Exception e) {
                e.printStackTrace();
                return false;
            }
        }
    
        public static Map<String, String> getSaveInformation(Context context) {
            try {
                FileInputStream fis = context.openFileInput("data.txt");
                BufferedReader br = new BufferedReader(new InputStreamReader(fis));
                String str = br.readLine();
                String[] infos = str.split("用户名:"+"密码:"+"邮箱:");
                Map<String, String> map = new HashMap<String, String>();
                map.put("username", infos[0]);
                map.put("password", infos[1]);
                fis.close();
                return map;
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }
    }

示例图片  
![注册账号][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70 4]  
【评论需要解决的问题或者文章中的不恰当的地方，接受改正】

[20190506185251182.png]: /images/20220205/06cbc5726d8c449a9bf2ab2ad935c52d.png
[20190506190259673.png]: /images/20220205/04cc6ee30af642998dce35bfdf543ffc.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70]: /images/20220205/725b2c714b8242e4b208bb572648fce8.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70 1]: /images/20220205/6ebf1326f0ba45528d8b31b239912a68.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70 2]: /images/20220205/7633b22afb6f46e59aa9e470c1c76657.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70 3]: /images/20220205/330249112e94404995e6f3e5f8feb375.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70 4]: /images/20220205/28dc4e02c756488d9236f03a7196c5ba.png