尝试使用SQLite在安卓中存储数据，在创建contract类和helper类时出现问题

implementation 'androidx.sqlite:sqlite:2.2.0'

import android.provider.BaseColumns;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import android.provider.BaseColumns;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class MyDatabaseContract {
    private MyDatabaseContract() {}

    public static class MyTable implements BaseColumns {
        public static final String TABLE_NAME = "my_table";
        public static final String COLUMN_NAME_TITLE = "title";
        public static final String COLUMN_NAME_CONTENT = "content";
    }
}

public class MyDatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "my_database.db";
    private static final int DATABASE_VERSION = 1;

    private static final String SQL_CREATE_ENTRIES =
        "CREATE TABLE " + MyDatabaseContract.MyTable.TABLE_NAME + " (" +
        MyDatabaseContract.MyTable._ID + " INTEGER PRIMARY KEY," +
        MyDatabaseContract.MyTable.COLUMN_NAME_TITLE + " TEXT," +
        MyDatabaseContract.MyTable.COLUMN_NAME_CONTENT + " TEXT)";

    private static final String SQL_DELETE_ENTRIES =
        "DROP TABLE IF EXISTS " + MyDatabaseContract.MyTable.TABLE_NAME;

    public MyDatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(SQL_CREATE_ENTRIES);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL(SQL_DELETE_ENTRIES);
        onCreate(db);
    }
}