SQLite:没有这样的表错误Android P问题

在Android P之前,我的代码一切正常,但现在在Android P中,我在处理数据库时遇到了很多问题。

我在assets文件夹中存储了.db sqlite数据库文件。我把它们导入android的数据库空间,直到android P。在android P中,我得到了一个例外: SQLite: No Such Table Error

我在这里搜索了一下,找到了这个,我试着用公认的答案: Android P - 'SQLite: No Such Table Error' after copying database from assets

问题是,现在我有另一个问题,它仍然不起作用。现在我的问题是 每次我试图检查数据库是否已经存在,这段代码总是返回true,所以我从不创建数据库 . 即使没有创建数据库,即使最近安装了应用程序:

private boolean checkIfDBExists() {
    File dbFile = new File(DB_COMPLETE_PATH);
    return dbFile.exists();
}

我的源代码是前面引用的问题中接受答案的源代码。

public static String getDatabasePath(String fileNname){
    MySQLiteOpenHelper helper = new MySQLiteOpenHelper(ApplicationContextProvider.getContext(), fileNname);
    SQLiteDatabase database = helper.getReadableDatabase();
    String path = database.getPath();
    database.close();
    return path;
}

public class MySQLiteOpenHelper extends SQLiteOpenHelper {
    public MySQLiteOpenHelper(Context context, String databaseName) {
        super(context, databaseName, null, 2);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {

    }

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

    }

    @Override
    public void onOpen(SQLiteDatabase db) {
        super.onOpen(db);
        db.disableWriteAheadLogging();
    }
}

我的DBHelper类:

public class DbHelper extends SQLiteOpenHelper{ 
    private  String DB_NAME;
    private  String DB_COMPLETE_PATH;
    private SQLiteDatabase mDataBase;
    private static final int DATABASE_VERSION = 1;

    public DbHelper(String name) throws IOException {
        super(ApplicationContextProvider.getContext(), name+".db", null, DATABASE_VERSION);
        this.DB_NAME = name+".db";
        this.DB_COMPLETE_PATH = Util.getDatabasePath(DB_NAME);

        boolean mustOverWriteDB; 

        if (checkIfDBExists()==false) {
            createDataBase();
        }

        openDataBase();
    }

    private void createDataBase() throws IOException {
        this.getReadableDatabase();
        try {           
            copyDataBase();            
        } catch (IOException e) {           
            throw new RuntimeException(e);
        }
    }

    public void copyDataBase() throws IOException {
        InputStream myInput = App.getInstance().getAssetsFile(DB_NAME);
        String outFileName = DB_COMPLETE_PATH;
        OutputStream myOutput = new FileOutputStream(outFileName);
        byte[] buffer = new byte[1024];
        int length;
        while ((length = myInput.read(buffer)) > 0) {
            myOutput.write(buffer, 0, length);
        }
        myOutput.flush();
        myOutput.close();
        myInput.close();
    }
}