新建項目

一、新建MyDatabaseHelper類繼承自SQLiteOpenHelper

package com.example.databasetest;

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

import androidx.annotation.Nullable;

public class MyDatabaseHelper extends SQLiteOpenHelper {
    public static final String CREATE_BOOK="create table book("
            + "id integer primary key autoincrement,"
            + "author text,"
            + "price real,"
            + "pages integer,"
            + "name text)";
    private Context mContext;
    public MyDatabaseHelper(@Nullable Context context, @Nullable String name, @Nullable SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
        mContext=context;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_BOOK);
        Toast.makeText(mContext,"Create succeeded",Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

將建表語句定義成字符串常量

在onCreate方法中調用SQLiteDatabase的execSQL方法執行建表語句，并且彈出一個Toast提示創建成功

二、在布局文件activity_main.xml中加入按鈕，用于創建數據庫

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <Button
        android:id="@+id/create_database"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Create database"
        />
</LinearLayout>

三、在MainActivity方法中

package com.example.databasetest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    private MyDatabaseHelper dbHelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        dbHelper=new MyDatabaseHelper(this,"BookStore.db",null,1);
        Button createDatabase=(Button) findViewById(R.id.create_database);
        createDatabase.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dbHelper.getWritableDatabase();
            }
        });
    }
}

在onCreate方法中構建一個MyDatabaseHelper對象，通過其構造函數的參數將數據庫名指定為：BookStore.db版本號指定為：1

在按鈕的點擊事件中調用getWritableDatabase方法 ，當第一次點擊按鈕 時會創建數據庫 ，再次點擊發現已經存在不會再創建

四、運行結果：

五、驗證數據庫創建結果：