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【Android】登录注册完整版~SQLite存储、记住密码

一叶轻舟okok 2022-01-23 阅读 86
androidsqlitejava

文章目录

0.目前情况：

1.实现功能

登录：账号，密码不为空；记住密码；登录成功后跳转至主页面
注册：账号、密码、确认密码不为空；同意条款；账号没有被注册过；密码和确认密码一直；跳转回登录页面

2.实现后：

（1）注册：

（2）登录

1.代码目录

在这里插入图片描述

在这里插入图片描述

2.代码：

1.manifests.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mainapp_bleda2">

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="步态压力监测系统"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.MaterialComponents.Light.NoActionBar"
        android:usesCleartextTraffic="true">
        <activity android:name=".MainActivity"></activity>
        <activity android:name=".LoginActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".RegisterActivity" ></activity>
    </application>

</manifest>

2.User.java

package com.example.mainapp_bleda2.bean;

public class User {
    String account;
    String pass;

    public String getAccount() {
        return account;
    }

    public void setAccount(String account) {
        this.account = account;
    }

    public String getPass() {
        return pass;
    }

    public void setPass(String pass) {
        this.pass = pass;
    }

    @Override
    public String toString() {
        return "User{" +
                "account='" + account + '\'' +
                ", pass='" + pass + '\'' +
                '}';
    }
}

3.ToastUtil.java

package com.example.mainapp_bleda2.bean;

public class User {
    String account;
    String pass;

    public String getAccount() {
        return account;
    }

    public void setAccount(String account) {
        this.account = account;
    }

    public String getPass() {
        return pass;
    }

    public void setPass(String pass) {
        this.pass = pass;
    }

    @Override
    public String toString() {
        return "User{" +
                "account='" + account + '\'' +
                ", pass='" + pass + '\'' +
                '}';
    }
}

4.LoginActivity.java

package com.example.mainapp_bleda2;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.nfc.Tag;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.example.mainapp_bleda2.bean.User;

import org.w3c.dom.Text;

import java.util.List;


public class LoginActivity extends AppCompatActivity {

    private Button btnLogin;
    private EditText etAccount, etPassword;
    private TextView toReg;
    private CheckBox cb_Remember;
//    private String userName = "111";
//    private String pwd = "123";

    private MySQLiteOpenHelper mySQLiteOpenHelper;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);

        initView();
        initData();

        //设置点击监听按钮
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String account = etAccount.getText().toString();
                String password = etPassword.getText().toString();

                List<User> userList =  mySQLiteOpenHelper.selectByAccountAndPass(account,password);
                System.out.println(userList);

                if(!userList.isEmpty()){  //说明查到了
                    Toast.makeText(LoginActivity.this,"登录成功！",Toast.LENGTH_LONG).show();

                    if(cb_Remember.isChecked()){
                        SharedPreferences spf = getSharedPreferences("spfRecorid",MODE_PRIVATE);
                        SharedPreferences.Editor edit = spf.edit();
                        edit.putString("account", account);
                        edit.putString("password",password);
                        edit.putBoolean("isRemember",true);
                        edit.apply();
                    }else{
                        SharedPreferences spf = getSharedPreferences("spfRecorid",MODE_PRIVATE);
                        SharedPreferences.Editor edit = spf.edit();
                        edit.putBoolean("isRemember",false);
                        edit.apply();
                    }

                    Intent intent = new Intent(LoginActivity.this,MainActivity.class);
                    startActivity(intent);
                }else{
                    Toast.makeText(LoginActivity.this,"账号或密码错误！",Toast.LENGTH_LONG).show();
                }
            }
        });

        toReg = findViewById(R.id.toReg);
        toReg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(LoginActivity.this,RegisterActivity.class);
                startActivity(intent);
            }
        });
    }


    private void initView(){
        btnLogin = findViewById(R.id.btn_login);
        etAccount = findViewById(R.id.et_account);
        etPassword = findViewById(R.id.et_password);
        mySQLiteOpenHelper = new MySQLiteOpenHelper(this);
        cb_Remember = findViewById(R.id.cb_Remember);
    }

//    记住密码初始化功能
    private void initData(){
        SharedPreferences spf = getSharedPreferences("spfRecorid",MODE_PRIVATE);

        boolean isRem = spf.getBoolean("isRemember",false);
        String account = spf.getString("account","");
        String password = spf.getString("password","");

        if(isRem){
            etAccount.setText(account);
            etPassword.setText(password);
            cb_Remember.setChecked(true);
        }


    }

}

5.RegisterActivity.java

package com.example.mainapp_bleda2;

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.example.mainapp_bleda2.bean.User;
import com.example.mainapp_bleda2.utils.ToastUtil;

import java.util.List;

public class RegisterActivity extends AppCompatActivity implements View.OnClickListener{

    private EditText etAccount, etPass, etPassConfirm;
    private Button btnRegister, button2;
    private CheckBox cbAgree;

    private MySQLiteOpenHelper mySQLiteOpenHelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);

//        返回登录页面
        button2 = (Button) findViewById(R.id.button2);

        etAccount = findViewById(R.id.et_account1);
        etPass = findViewById(R.id.et_password1);
        etPassConfirm = findViewById(R.id.et_password_confirm);
        btnRegister = findViewById(R.id.btn_register);
        cbAgree = findViewById(R.id.cb_Agree);

        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //Intent intent = new Intent(MainActivity.this,DetailActivity.class);
                Intent intent = new Intent(RegisterActivity.this,LoginActivity.class);
                startActivity(intent);
            }
        });


//       第一种方式写监听事件
//        btnRegister.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View view) {
//                …………
//            }
//        });

//        第二种方式写监听事件
        btnRegister.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        String account = etAccount.getText().toString().trim();
        String pass = etPass.getText().toString().trim();
        String passConfirm = etPassConfirm.getText().toString();

//        TextUtils.isEmpty()  和   name.isEmpty()   的区别
//        第一个可以判断 NULL 和 “”  两种为空的情况，且均判断为空
//        第二个只能判断“”这一种情况，如果为NULL则会报空指针异常。

        if(TextUtils.isEmpty(account)){
            Toast.makeText(RegisterActivity.this,"用户名不能为空", Toast.LENGTH_LONG).show();
            return;
        }
        mySQLiteOpenHelper = new MySQLiteOpenHelper(this);
//        查询这个账号是否已经被注册
        List<User> userList = mySQLiteOpenHelper.selectByAccount(account);
        if(!userList.isEmpty()){  //说明已经被注册过了
            Toast.makeText(RegisterActivity.this,"该账号已经被注册！",Toast.LENGTH_LONG).show();
            return;
        }

        if(TextUtils.isEmpty(pass)){
            Toast.makeText(RegisterActivity.this,"密码不能为空",Toast.LENGTH_LONG).show();
            return;
        }
        if(!TextUtils.equals(pass,passConfirm)){
            Toast.makeText(RegisterActivity.this,"两次密码不一致",Toast.LENGTH_LONG).show();
            return;
        }
        if(!cbAgree.isChecked()){
            Toast.makeText(RegisterActivity.this,"请同意用户协议",Toast.LENGTH_LONG).show();
            return;
        }


        User user = new User();
        user.setAccount(account);
        user.setPass(pass);

        //插入数据到数据库中
        mySQLiteOpenHelper = new MySQLiteOpenHelper(this);
        long rowId = mySQLiteOpenHelper.insertData(user);
        if(rowId != -1){
            ToastUtil.toastShort(this,"注册成功");
            Intent intent = new Intent(RegisterActivity.this,LoginActivity.class);
            startActivity(intent);
        }else {
            ToastUtil.toastShort(this,"注册失败");
        }


    }
}

6.MySQLiteOpenHelper.java

package com.example.mainapp_bleda2;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.text.TextUtils;

import androidx.annotation.Nullable;

import com.example.mainapp_bleda2.bean.User;
import com.example.mainapp_bleda2.utils.ToastUtil;

import java.util.ArrayList;
import java.util.List;

public class MySQLiteOpenHelper extends SQLiteOpenHelper {

    //数据库的名字
    private static final String DB_NAME = "mySQLite.db";
    //表格的名字
    private static final String TABLE_NAME_USER = "user";
    //插入语句
    private static final String CREATE_TABLE_SQL = "create table " + TABLE_NAME_USER + "(id INTEGER PRIMARY KEY AUTOINCREMENT, account text, pass text)";
    public MySQLiteOpenHelper(Context context) {
        super(context, DB_NAME, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE_SQL);
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

    }

    //插入数据
    public long insertData(User user){
        SQLiteDatabase db = getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put("account",user.getAccount());
        values.put("pass",user.getPass());
        return db.insert(TABLE_NAME_USER,null,values);

    }


    //通过账号密码查询
    public List<User> selectByAccountAndPass(String account, String password) {
        SQLiteDatabase db = getReadableDatabase();
        Cursor cursor = db.query(TABLE_NAME_USER, null, "account=? and pass=?", new String[]{account, password}, null, null, null);
        List<User> userList = new ArrayList<>();
        if (cursor != null) {
            while (cursor.moveToNext()) {
                String account1 = cursor.getString(cursor.getColumnIndex("account"));
                String password1 = cursor.getString(cursor.getColumnIndex("pass"));
                User user = new User();
                user.setAccount(account1);
                user.setPass(password1);
                userList.add(user);
            }
            return userList;
        }
        return null;
    }

    //通过账号查询
    public List<User> selectByAccount(String account) {
        SQLiteDatabase db = getReadableDatabase();
        Cursor cursor = db.query(TABLE_NAME_USER, null, "account=?", new String[]{account}, null, null, null);
        List<User> userList = new ArrayList<>();
        if (cursor != null) {
            while (cursor.moveToNext()) {
                String account1 = cursor.getString(cursor.getColumnIndex("account"));
                User user = new User();
                user.setAccount(account1);
                userList.add(user);
            }
            return userList;
        }
        return null;
    }
}

7. btn_bg_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@color/colorPrimary"/>
    <item android:state_pressed="false" android:drawable="@color/colorPrimaryVariant"/>
</selector>

8.edit_text_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <stroke android:width="2dp" android:color="@color/colorPrimary"/>
    <corners android:radius="10dp"/>
</shape>

9.activity_register.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".RegisterActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="10dp"
        android:gravity="left">

        <ImageView
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:layout_marginLeft="-30dp"
            android:layout_marginTop="-30dp"
            android:src="@mipmap/ic_launcher_foreground"
            />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:gravity="center_vertical"
            android:layout_marginTop="-10dp"
            android:layout_marginLeft="-33dp"
            android:text="步态压力监测系统"
            android:textSize="30sp" />
    </LinearLayout>

    <!-- 账号框-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="账&#12288;&#12288;号:"
            android:textSize="25dp"
            android:gravity="center_vertical"/>
        <EditText
            android:id="@+id/et_account1"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:hint="请输入手机号"
            android:textSize="18dp"
            android:layout_marginLeft="20dp"
            android:paddingLeft="10dp"
            android:inputType="number"
            android:background="@drawable/edit_text_bg"/>
    </LinearLayout>

    <!-- 密码-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="40dp"
        >
        <TextView

            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密&#12288;&#12288;码:"
            android:textSize="25dp"
            android:gravity="center_vertical"/>
        <EditText
            android:id="@+id/et_password1"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:hint="请输入密码"
            android:textSize="18dp"
            android:layout_marginLeft="20dp"
            android:paddingLeft="10dp"
            android:inputType="textPassword"
            android:background="@drawable/edit_text_bg"/>
    </LinearLayout>

    <!-- 确认密码-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="40dp"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="确认密码:"
            android:textSize="25dp"
            android:gravity="center_vertical"/>
        <EditText
            android:id="@+id/et_password_confirm"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:hint="请再次输入密码"
            android:textSize="18dp"
            android:layout_marginLeft="20dp"
            android:paddingLeft="10dp"
            android:inputType="textPassword"
            android:background="@drawable/edit_text_bg"/>
    </LinearLayout>

    <CheckBox
        android:id="@+id/cb_Agree"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="同意协议"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="10dp"/>

    <Button
        android:id="@+id/btn_register"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="注册"
        android:textSize="25sp"
        android:layout_marginTop="40dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:textColor="@color/white"
        android:background="@drawable/btn_bg_selector"/>

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="已有账号"
        android:textSize="25sp"
        android:layout_marginTop="20dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:textColor="@color/white"
        android:background="@drawable/btn_bg_selector"/>



</LinearLayout>

10.login.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".LoginActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="40dp"
        android:gravity="center_horizontal"
        >

        <ImageView
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:src="@mipmap/ic_launcher_foreground"
            />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:gravity="center_vertical"
            android:text="步态压力监测系统"
            android:textSize="43sp"
            android:layout_marginTop="-35dp"/>
    </LinearLayout>

    <!-- 账号框-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="50dp"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="账号:"
            android:textSize="25dp"
            android:gravity="center_vertical"/>
        <EditText
            android:id="@+id/et_account"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:hint="请输入手机号"
            android:textSize="18dp"
            android:layout_marginLeft="20dp"
            android:paddingLeft="10dp"
            android:inputType="number"
            android:background="@drawable/edit_text_bg"/>
    </LinearLayout>

    <!-- 密码-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="40dp"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密码:"
            android:textSize="25dp"
            android:gravity="center_vertical"/>
        <EditText
            android:id="@+id/et_password"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:hint="请输入密码"
            android:textSize="18dp"
            android:layout_marginLeft="20dp"
            android:paddingLeft="10dp"
            android:inputType="textPassword"
            android:background="@drawable/edit_text_bg"/>
    </LinearLayout>

<!--    记住密码-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="20dp"
        >
        <CheckBox
            android:id="@+id/cb_Remember"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="记住密码"/>
    </LinearLayout>

    <Button
        android:id="@+id/btn_login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="登录"
        android:textSize="25sp"
        android:layout_marginTop="20dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:textColor="@color/white"
        android:background="@drawable/btn_bg_selector"/>

    <TextView
        android:id="@+id/toReg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@color/colorPrimary"
        android:text="还没有账号？"
        android:layout_gravity="right"
        android:layout_marginRight="2dp"
        android:layout_marginTop="10dp"/>

</LinearLayout>

11.theam.xml

<resources xmlns:tools="http://schemas.android.com/tools">
<!--    主题色-->
    <color name="colorPrimary">@color/purple_500</color>
    <color name="colorPrimaryVariant">@color/purple_700</color>
    <!-- Base application theme. -->
    <style name="Theme.SimpleAndroidApp" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
        <!-- Primary brand color. -->

        <item name="colorPrimary">@color/purple_500</item>
        <item name="colorPrimaryVariant">@color/purple_700</item>
        <item name="colorOnPrimary">@color/white</item>
        <!-- Secondary brand color. -->
        <item name="colorSecondary">@color/teal_200</item>
        <item name="colorSecondaryVariant">@color/teal_700</item>
        <item name="colorOnSecondary">@color/black</item>
        <!-- Status bar color. -->
        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
        <!-- Customize your themhere. -->
    </style>
</resources>
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