【Android】家庭记账本手机版开发报告五

一、说在前面

昨天	1、添加菜单（查询、清除所有等）2、使用滑动删除
今天	1、创建登入和注册界面 2、向数据库添加一张用户表
问题	做完后在登入时有bug（未解决）

二、界面的搭建

1、登入界面

2、登入界面的代码（粗糙版）

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/frameLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".loginFragment" >

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.9" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.1" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/title_text"
        android:textSize="@dimen/title_font"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/guideline4"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="@+id/guideline6"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.05" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="175dp"
        android:layout_height="174dp"
        android:contentDescription="@string/dec"
        android:src="@drawable/login"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintDimensionRatio="w,1:1"
        app:layout_constraintEnd_toStartOf="@+id/guideline4"
        app:layout_constraintStart_toStartOf="@+id/guideline6"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.2" />

    <EditText
        android:id="@+id/editTextusername"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:ems="10"
        android:hint="@string/username"
        android:importantForAutofill="no"
        android:inputType="textPersonName"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/guideline4"
        app:layout_constraintStart_toStartOf="@+id/guideline6"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.5" />

    <EditText
        android:id="@+id/editTextpassword"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="@string/password"
        android:importantForAutofill="no"
        android:inputType="textPassword"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/editTextusername"
        app:layout_constraintStart_toStartOf="@+id/editTextusername"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.6" />

    <Button
        android:id="@+id/buttonlogin"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/login"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/editTextusername"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="@+id/editTextusername"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.7" />

    <Button
        android:id="@+id/buttonregister"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/button_registe"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/editTextusername"
        app:layout_constraintStart_toStartOf="@+id/editTextusername"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.8" />
</androidx.constraintlayout.widget.ConstraintLayout>

3、注册界面

4、注册界面代码

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/frameLayout2"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".UserAddFragment">

    <TextView
        android:id="@+id/textView6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/user_add_tltle"
        android:textSize="@dimen/title_font"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/guideline10"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="@+id/guideline9"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.15" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.1" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.9" />

    <EditText
        android:id="@+id/editTextU"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:ems="10"
        android:hint="@string/user_add_username"
        android:inputType="textPersonName"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/guideline10"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="@+id/guideline9"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.3"
        android:importantForAutofill="no" />

    <EditText
        android:id="@+id/editTextP"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="@string/user_add_password"
        android:inputType="textPassword"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/editTextU"
        app:layout_constraintStart_toStartOf="@+id/editTextU"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.45"
        android:importantForAutofill="no" />

    <EditText
        android:id="@+id/editTextRP"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="@string/user_add_repressword"
        android:inputType="textPassword"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/editTextP"
        app:layout_constraintStart_toStartOf="@+id/editTextP"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.6"
        android:importantForAutofill="no" />

    <Button
        android:id="@+id/buttonR"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/button_registe"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/editTextU"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="@+id/editTextU"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.75" />
</androidx.constraintlayout.widget.ConstraintLayout>

二、用户表的创建

1、实体（User.java）

package com.me.familybookkeepingbook;

import androidx.room.ColumnInfo;
import androidx.room.Entity;
import androidx.room.PrimaryKey;

@Entity
public class User {
    @PrimaryKey(autoGenerate = true)
    private int id;
    @ColumnInfo(name = "user_name")
    private String userName;
    @ColumnInfo(name = "password")
    private String password;
    @ColumnInfo(name = "current_money")
    private double currentMoney;

    public User(String userName, String password) {
        this.userName = userName;
        this.password = password;
        this.currentMoney = 0;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public double getCurrentMoney() {
        return currentMoney;
    }

    public void setCurrentMoney(double currentMoney) {
        this.currentMoney = currentMoney;
    }
}

2、Dao

package com.me.familybookkeepingbook;

import androidx.room.Dao;
import androidx.room.Delete;
import androidx.room.Insert;
import androidx.room.Query;
import androidx.room.Update;

@Dao
public interface UserDao {
    @Insert
    void insertUser(User...users);
    @Delete
    void deleteUser(User...users);
    @Update
    void updateUser(User...users);
    @Query("SELECT * From USER WHERE user_name like:userName_y AND password like :password_y")
    User findUser(String userName_y ,String password_y);
}

3、DataBase

package com.me.familybookkeepingbook;

import androidx.room.Database;
import android.content.Context;
import androidx.room.Room;
import androidx.room.RoomDatabase;

@Database(entities = {User.class},version = 1,exportSchema = false)
public abstract class UserDatabase extends RoomDatabase {
    private static UserDatabase INSTANCE;
    public abstract UserDao getUserDao();
    static synchronized UserDatabase getUserDataBase(Context context){
        if (INSTANCE == null){
            INSTANCE = Room.databaseBuilder(context.getApplicationContext(),UserDatabase.class,"user_database")
                    .build();
        }
        return INSTANCE;
    }
}

4、工厂

package com.me.familybookkeepingbook;

import android.content.Context;
import android.os.AsyncTask;

import androidx.lifecycle.LiveData;

import java.util.List;

public class UserRepository {
    private UserDao userDao;
    static User user_0;
    public UserRepository(Context context) {
        UserDatabase userDatabase = UserDatabase.getUserDataBase(context.getApplicationContext());
        userDao = userDatabase.getUserDao();
    }

    void insertUser(User ... users){
        new InsertAsyncTask(userDao).execute(users);
    }
    void deleteUser(User ... users){
        new DeleteAsyncTask(userDao).execute(users);
    }
    void updateUser(User ... users){
        new UpdateAsyncTask(userDao).execute(users);
    }
    Boolean queueUser(User user){
        new QueueAsyncTask(userDao).execute(user);
        if(user==null||user_0==null){
            return false;
        }else if(user_0.getUserName().equals(user.getUserName())&&user_0.getPassword().equals(user.getPassword())){
            return true;
        }else {
            return false;
        }
    }
    static class InsertAsyncTask extends AsyncTask<User ,Void,Void> {
        private UserDao userDao;

        public InsertAsyncTask(UserDao userDao) {
            this.userDao = userDao;
        }

        @Override
        protected Void doInBackground(User... users) {
            userDao.insertUser(users);
            return null;
        }
    }
    static class DeleteAsyncTask extends AsyncTask<User ,Void,Void> {
        private UserDao userDao;

        public DeleteAsyncTask(UserDao userDao) {
            this.userDao = userDao;
        }

        @Override
        protected Void doInBackground(User... users) {
            userDao.deleteUser(users);
            return null;
        }
    }
    static class UpdateAsyncTask extends AsyncTask<User ,Void,Void> {
        private UserDao userDao;

        public UpdateAsyncTask(UserDao userDao) {
            this.userDao = userDao;
        }

        @Override
        protected Void doInBackground(User... users) {
            userDao.updateUser(users);
            return null;
        }
    }
    static class QueueAsyncTask extends AsyncTask<User ,Void,Void> {
        private UserDao userDao;
        public QueueAsyncTask(UserDao userDao) {
            this.userDao = userDao;
        }

        @Override
        protected Void doInBackground(User... users) {
            User user1 = new User("王正帅","123");
            for (User user:users) {
                user1 = userDao.findUser(user.getUserName(),user.getPassword());
                user_0 = user1;
            }
            return null;
        }
    }

}

三、功能逻辑

1、注册

1）点击注册从登入转到注册界面

buttonRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                NavController controller = Navigation.findNavController(v);
                controller.navigate(R.id.action_loginFragment_to_userAddFragment);
            }
        });

2）将正确数据添加导数据库并返回登录界面

@Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        userRepository = new UserRepository(requireActivity());
        buttonRegister = requireActivity().findViewById(R.id.buttonR);
        editTextPassword = requireActivity().findViewById(R.id.editTextP);
        editTextRP = requireActivity().findViewById(R.id.editTextRP);
        editTextUserName = requireActivity().findViewById(R.id.editTextU);
        buttonRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String userName = editTextUserName.getText().toString().trim();
                String password = editTextPassword.getText().toString().trim();
                User user = new User(userName,password);
                userRepository.insertUser(user);
                NavController controller = Navigation.findNavController(v);
                controller.navigate(R.id.action_userAddFragment_to_loginFragment);
            }
        });
    }

2、登入

buttonLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String userName = editTextUserName.getText().toString().trim();
                String password = editTextPassword.getText().toString().trim();
                User user = new User(userName,password);
                Boolean f = userRepository.queueUser(user);
                if(f){
                    NavController controller = Navigation.findNavController(v);
                    controller.navigate(R.id.action_loginFragment_to_accountRecordFragment);
                }else {
                    AlertDialog.Builder builder = new AlertDialog.Builder(requireActivity());
                    builder.setTitle("账号或密码错误，请重新输入！");
                    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                        }
                    });
                    builder.create();
                    builder.show();
                }

            }
        });

四、运行测试