3/5每日总结

在今天一整天再弄android stuido 的这个app 很难，自己在网上查找相关代码，对于记事本的增加，删除，连接数据库等等，每个界面都要相互关联。

package com.example.qwe;
/*
* 注册界面
* */
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.Toast;

import com.example.qwe.db.DatabaseHelper;
import com.example.qwe.Bean.User;

import java.util.ArrayList;

public class Register extends AppCompatActivity {

    private DatabaseHelper mSQLite;

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

        //找到各个控件
        Button btn_ready = findViewById(R.id.bt_registeractivity_register);
        ImageView btn_back = findViewById(R.id.iv_registeractivity_back);
        EditText ed_name = findViewById(R.id.et_registeractivity_id);
        EditText ed_password = findViewById(R.id.et_registeractivity_password);
        EditText ed_name1 = findViewById(R.id.et_registeractivity_username);
        EditText ed_tel = findViewById(R.id.et_registeractivity_phone);
        EditText ed_class = findViewById(R.id.et_registeractivity_classes);

        //注册监听事件
        btn_ready.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //获取输入的用户名和密码
                String name = ed_name.getText().toString().trim();
                String password = ed_password.getText().toString().trim();
                String name1 = ed_name1.getText().toString().trim();
                String tel = ed_tel.getText().toString().trim();
                String classs = ed_class.getText().toString().trim();

                //获取数据库数据，判断用户名是否已存在
                ArrayList<User> data = mSQLite.getAllDATA();
                boolean flag = false;
                for (int i = 0; i < data.size(); i++) {
                    User userdata = data.get(i);
                    if (name.equals(userdata.getId())) {
                        flag = true;
                        break;
                    } else {
                        flag = false;
                    }
                }
                //判断用户名和密码是否为空
                if (!TextUtils.isEmpty(name) && !TextUtils.isEmpty(password)) {
                    if (!flag) {
                        mSQLite.insert(name, password, name1, tel, classs);
                        Intent intent1 = new Intent(Register.this, Login.class);
                        startActivity(intent1);
                        finish();
                        Toast.makeText(Register.this, "注册成功", Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(Register.this, "用户名已被注册", Toast.LENGTH_SHORT).show();
                    }
                } else {
                    Toast.makeText(Register.this, "用户名与密码不能为空", Toast.LENGTH_SHORT).show();
                }
            }
        });

        //监听返回按钮
        btn_back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent2 = new Intent(Register.this, Login.class);
                startActivity(intent2);
                finish();
            }
        });
        mSQLite = new DatabaseHelper(Register.this);
    }
}