检查Android中是否存在sqlite db

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

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

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

    @Override
    public void onCreate(SQLiteDatabase db) {
        // 创建数据库表格的代码
        // 示例：db.execSQL("CREATE TABLE IF NOT EXISTS mytable (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT);");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // 升级数据库的代码
    }
}

DatabaseHelper dbHelper = new DatabaseHelper(context);
SQLiteDatabase db = dbHelper.getReadableDatabase();

Cursor cursor = db.rawQuery("SELECT name FROM sqlite_master WHERE type='table' AND name='mytable';", null);
if (cursor.getCount() > 0) {
    // 表格存在
} else {
    // 表格不存在
}
cursor.close();