记账本的注册

package com.example.myfinancier;
import android.content.Intent;
import android.os.Bundle;
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;

import androidx.appcompat.app.AppCompatActivity;

import java.util.ArrayList;

public class RegisterActivity extends AppCompatActivity implements View.OnClickListener{

    private String realCode;
    private DateBase DateBase;
    private Button mBtRegisteractivityRegister;
    private RelativeLayout mRlRegisteractivityTop;
    private ImageView mIvRegisteractivityBack;
    private LinearLayout mLlRegisteractivityBody;
    private EditText mEtRegisteractivityUsername;
    private EditText mEtRegisteractivityPassword1;
    private EditText mEtRegisteractivityPassword2;

    private RelativeLayout mRlRegisteractivityBottom;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);

        initUI();

        DateBase=new DateBase(this);
    }

    private void initUI(){
        mBtRegisteractivityRegister = findViewById(R.id.bt_registeractivity_register);
        mRlRegisteractivityTop = findViewById(R.id.rl_registeractivity_top);
        mIvRegisteractivityBack = findViewById(R.id.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);

        mRlRegisteractivityBottom = findViewById(R.id.rl_registeractivity_bottom);

        mIvRegisteractivityBack.setOnClickListener(this);
        mBtRegisteractivityRegister.setOnClickListener(this);
    }

    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.back: //返回登录页面
                Intent intent1 = new Intent(this, MainActivity.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 = mEtRegisteractivityPassword2.getText().toString().trim();
                String password_check = mEtRegisteractivityPassword1.getText().toString().trim();
                //注册验证
                if (!TextUtils.isEmpty(username) && !TextUtils.isEmpty(password)  ) {
                        //验证用户名是否已经注册过
                        ArrayList data = DateBase.getAllData();
                        boolean username_repetition = false;
                        for (int i = 0; i < data.size(); i++) {
                            User user = data.get(i);
                            if (username.equals(user.getName())) {
                                username_repetition = true;
                                break;
                            } else {
                                username_repetition = false;
                            }
                        }
                        //用户名已注册
                        if(username_repetition){
                            Toast.makeText(this, "用户名已注册！", Toast.LENGTH_SHORT).show();
                        }
                        //用户名未注册，继续验证
                        if (!username_repetition) {
                            if( password.equals(password_check)) {
                                //将用户名和密码加入到数据库中
                                DateBase.add_user(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, "两次密码输入不一致,注册失败", Toast.LENGTH_SHORT).show();
                            }
                        }

                }else {
                    Toast.makeText(this, "未完善信息，注册失败", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }
}