3/5每日总结

所花时间：4小时

代码量：如下

博客量：本学期截至目前16篇

了解到的知识点：链接mysql数据库

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。

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90

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);     } }