觅踪5

冲刺阶段过半，开了一次小会，明确了第一阶段的冲刺目标，互相之间加油打气，队内相互鼓励，活跃了一下氛围

个人的登录功能的构建也日趋完善，期间也会有一些小问题，相互讨论，并在一些教程以及CSDN论坛的帖子中寻找解决问题的方法

Main2Activity

package com.example.demo2;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class Main2Activity extends AppCompatActivity  implements View.OnClickListener {

    private String realCode;
    private DBOpenHelper mDBOpenHelper;
    private Button mBtRegisteractivityRegister;
    private RelativeLayout mRlRegisteractivityTop;
    private ImageView mIvRegisteractivityBack;
    private LinearLayout mLlRegisteractivityBody;
    private EditText mEtRegisteractivityUsername;
    private EditText mEtRegisteractivityPassword1;
    private EditText mEtRegisteractivityPassword2;
    private EditText mEtRegisteractivityPhonecodes;
    private ImageView mIvRegisteractivityShowcode;
    private RelativeLayout mRlRegisteractivityBottom;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        initView();
        mDBOpenHelper = new DBOpenHelper(this);
    }

    private void initView(){
        mBtRegisteractivityRegister = findViewById(R.id.bt_registeractivity_register);
        mRlRegisteractivityTop = findViewById(R.id.rl_registeractivity_top);
        mIvRegisteractivityBack = findViewById(R.id.iv_registeractivity_back);
        mLlRegisteractivityBody = findViewById(R.id.ll_registeractivity_body);
        mEtRegisteractivityUsername = findViewById(R.id.et_registeractivity_username);
        mEtRegisteractivityPassword1 = findViewById(R.id.et_registeractivity_password1);
        mEtRegisteractivityPassword2 = findViewById(R.id.et_registeractivity_password2);



        mIvRegisteractivityBack.setOnClickListener(this);

        mBtRegisteractivityRegister.setOnClickListener(this);
    }

    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.iv_registeractivity_back: //返回登录页面
                Intent intent1 = new Intent(this, Main2Activity.class);
                startActivity(intent1);
                finish();
                break;

            case R.id.bt_registeractivity_register:    //注册按钮
                //获取用户输入的用户名、密码、验证码
                String username = mEtRegisteractivityUsername.getText().toString().trim();
                String password = mEtRegisteractivityPassword1.getText().toString().trim();

                //注册验证
                if (!TextUtils.isEmpty(username) && !TextUtils.isEmpty(password)  ) {

                    //将用户名和密码加入到数据库中
                    mDBOpenHelper.add(username, password);
                    Intent intent2 = new Intent(this, MainActivity.class);
                    startActivity(intent2);
                    finish();
                    Toast.makeText(this,  "验证通过，注册成功", Toast.LENGTH_SHORT).show();
                }else {
                    Toast.makeText(this, "未完善信息，注册失败", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }
}

User

package com.example.demo2;


public class User {
    private String name;            //用户名
    private String password;        //密码

    public User(String name, String password) {
        this.name = name;
        this.password = password;

    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", password='" + password + '\'' +

                '}';
    }
}

DBOoenHelper

package com.example.demo2;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import java.util.ArrayList;

public class DBOpenHelper extends SQLiteOpenHelper {

    private SQLiteDatabase db;

    public DBOpenHelper(Context context) {
        super(context, "db_test", null, 1);
        db = getReadableDatabase();
    }

    @Override
    public void onCreate(SQLiteDatabase db){
        db.execSQL("CREATE TABLE IF NOT EXISTS user(" +
                "_id INTEGER PRIMARY KEY AUTOINCREMENT," +
                "name TEXT," +
                "password TEXT)");
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
        db.execSQL("DROP TABLE IF EXISTS user");
        onCreate(db);
    }
    public void add(String name,String password){
        db.execSQL("INSERT INTO user (name,password) VALUES(?,?)",new Object[]{name,password});
    }
    public void delete(String name,String password){
        db.execSQL("DELETE FROM user WHERE name = AND password ="+name+password);
    }
    public void updata(String password){
        db.execSQL("UPDATE user SET password = ?",new Object[]{password});
    }
    public ArrayList<User> getAllData(){

        ArrayList<User> list = new ArrayList<User>();
        Cursor cursor = db.query("user",null,null,null,null,null,"name DESC");
        while(cursor.moveToNext()){
            String name = cursor.getString(cursor.getColumnIndex("name"));
            String password = cursor.getString(cursor.getColumnIndex("password"));
            list.add(new User(name,password));
        }
        return list;
    }
}