如何在Android应用程序中插入日期时间设置为"now"的SQLite记录？

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

public class MyDatabaseHelper extends SQLiteOpenHelper {
    public static final String DATABASE_NAME = "my_database.db";
    public static final String TABLE_NAME = "my_table";
    public static final String COLUMN_ID = "_id";
    public static final String COLUMN_DATE_TIME = "date_time";

    public MyDatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTable = "CREATE TABLE " + TABLE_NAME + " (" +
                COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                COLUMN_DATE_TIME + " INTEGER)";
        db.execSQL(createTable);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
        onCreate(db);
    }

    public void insertDateTimeNow() {
        SQLiteDatabase db = this.getWritableDatabase();
        long currentTimeMillis = System.currentTimeMillis();
        String insertQuery = "INSERT INTO " + TABLE_NAME + " (" + COLUMN_DATE_TIME + ") VALUES (" + currentTimeMillis + ")";
        db.execSQL(insertQuery);
    }
}