Android | Use SQLite to implement user registration & store user personal information in it

I. Overview

This is to implement the registration function and store the registered information in the database.

Some simple understanding of SQLite

SQLite is a lightweight relational database that has fast computing speed and takes up few resources. Features : lightweight, independence, isolation, cross-platform, security, multi-language interface

2. Page display

【figure 1】

3. Code part

1. Registered layout activity_regiter.xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".Register">
    <!--    外部-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:gravity="center">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <TextView
                android:id="@+id/textVeiw"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="帐号注册信息页面"
                android:layout_gravity="center_vertical|center_horizontal"
                android:textSize="30dp"
                android:layout_margin="30dp"
                android:paddingBottom="20dp"/>

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:gravity="center"
            android:padding="5dp">

            <TextView
                android:id="@+id/textView1"
                android:layout_width="71dp"
                android:layout_height="25dp"
                android:text="帐号：" />
            <EditText
                android:id="@+id/et_account"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:ems="10"
                android:inputType="textPersonName"/>


        </LinearLayout>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:padding="5dp"
            android:gravity="center">
            <TextView
                android:id="@+id/textView2"
                android:layout_width="71dp"
                android:layout_height="25dp"
                android:text="密码：" />
            <EditText
                android:id="@+id/et_password"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:inputType="textPassword" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:padding="5dp"
            android:gravity="center">
            <TextView
                android:id="@+id/textView3"
                android:layout_width="71dp"
                android:layout_height="25dp"
                android:text="确认密码：" />


            <EditText
                android:id="@+id/et_repassword"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:inputType="textPassword" />
        </LinearLayout>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:padding="5dp"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/textView4"
                android:layout_width="71dp"
                android:layout_height="25dp"
                android:text="姓名：" />


            <EditText
                android:id="@+id/et_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:ems="10"
                android:inputType="textPersonName"
                />

        </LinearLayout>



        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:padding="5dp"
            android:orientation="horizontal">
            <TextView
                android:id="@+id/textView5"
                android:layout_width="71dp"
                android:layout_height="25dp"
                android:text="手机号：" />
            <EditText
                android:id="@+id/et_phone"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:ems="10"
                android:inputType="phone" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:gravity="center">
            <Button
                android:id="@+id/submit"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="提交"
                android:layout_margin="20dp"/>

            <Button
                android:id="@+id/back"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="返回" />
        </LinearLayout>

    </LinearLayout>

</LinearLayout>

2. Create a new package, name: Bean; create a Userinfo class (registration class) in this directory

Create a new package named: Bean; create a Userinfo class in this directory

[Figure: Directory structure diagram]

Userinfo class code:

package com.sziiit.cgy_620_sql.Bean;

public class Userinfo {
    private String account, password, name, phone;

    public String getAccount() {
        return account;
    }

    public void setAccount(String account) {
        this.account = account;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
}

3. Create a db package and create a MySqliteOpenHpler class in it

SQLite related functions:

MYSQLiteOpenHelper - Create a new database

onCreate(SQLiteDatabase db)——Create a new database table

onUpgrade——Upgrade use of database

 1. Use the SQL statement CREATE_USER to create the user table

 2. The MySqliteOpenHelper class should inherit the parent class SQLiteOpenHelper, implement the constructor MySQLiteOpenHelper(), and assign global variables to mContext

3. Create a data table through SQL statements, use sqliteDatabase.execSQL (CTREATE_USER) - create a user table (registry table)

 MySqliteOpenHpler class code:

package com.sziiit.cgy_620_sql.db;

import android.content.Context;
import android.database.DatabaseErrorHandler;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

public class MySQLiteOpenHelper extends SQLiteOpenHelper {

    public static final String CREATE_USER = "create table user(" +
            "id integer primary key autoincrement," +
            "account text," +
            "password text," +
            "name text," +
            "phone integer)";

    private Context mContext;

    public MySQLiteOpenHelper(@Nullable Context context) {
        super(context, "user.db",null,1);
        this.mContext = context;
    }
    
    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) {
        sqLiteDatabase.execSQL(CREATE_USER);
        Toast.makeText(mContext,"创建表成功",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

    }
}

4. RegiserActivity class

aaaaaaa