【Android】登录注册完整版~SQLite存储、记住密码

文章目录

0.目前情况：

1.实现功能2.实现后：

（1）注册：（2）登录 1.代码目录2.代码：

1.manifests.xml2.User.java3.ToastUtil.java4.LoginActivity.java5.RegisterActivity.java6.MySQLiteOpenHelper.java7. btn_bg_selector.xml8.edit_text_bg.xml9.activity_register.xml10.login.xml11.theam.xml

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

2.代码： 1.manifests.xml

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 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, etPass/confirm/i;
    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/i);
        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 = etPass/confirm/i.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 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,pass/confirm/i)){
            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 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 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 selectByAccount(String account) {
        SQLiteDatabase db = getReadableDatabase();
        Cursor cursor = db.query(TABLE_NAME_USER, null, "account=?", new String[]{account}, null, null, null);
        List 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

8.edit_text_bg.xml

9.activity_register.xml

10.login.xml

11.theam.xml

    @color/purple_500
    @color/purple_700