问使用sqlite android将数组转换为字符串格式

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    public ArrayList<String> getpid (int id){
    sqLiteDatabase =this.getReadableDatabase();
    ArrayList<String> list=new ArrayList<>();
    String sql="select p_id from cart where customer_id = '" + id + "' ";
    Cursor cursor=sqLiteDatabase.rawQuery(sql,null);
    if (cursor.moveToFirst()) {
        do {
            String idd = cursor.getString(0);
            String pid = cursor.getString(cursor.getColumnIndex("p_id"));
            list.add(pid);
            System.out.println("===pid"+pid);
        } while (cursor.moveToNext());
    }return list;

enter code here  ArrayList<String> arrayList=mydatabase.getpid(idd);
    System.out.println("--outside"+arrayList);
    for(int i =0; i<arrayList.size(); i++){

        String value=arrayList.get(i).toString();
        System.out.println("---size"+value);

    }