Android小部件读取openFileInput

Question

所以我对这个应用程序的制作都很陌生。

我尝试使用该命令到达文件 InputStream inputStream = openFileInput("files.txt");它给了我错误＆＃34;无法解决方法openFileInput(java.lang.String)＆＃34;。我的资源或资源中没有保存文件，它保存在我保存的任何地方当你在应用程序中创建它时。

问题

1. 我可以在小部件中阅读文件吗
2. 如果是这样，为什么这不起作用？

功能

private void readFiles() throws IOException 
{
    cards.removeAll(cards);
    InputStream inputStream = openFileInput("files.txt");
    if(inputStream != null){
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        int size = Integer.parseInt(bufferedReader.readLine());
        for(int i = 0; i < size; i++){
            card tmp = new card();
            tmp.setAlias(bufferedReader.readLine());
            tmp.setIconID(Integer.parseInt(bufferedReader.readLine()));
            tmp.setId(bufferedReader.readLine());
            tmp.setRemaining(Integer.parseInt(bufferedReader.readLine()));
            tmp.setDescription(bufferedReader.readLine());
            tmp.setPeriodStartDate(bufferedReader.readLine());
            tmp.setPeriodEndDate(bufferedReader.readLine());
            tmp.setPeriodRemaining(Integer.parseInt(bufferedReader.readLine()));
            tmp.setWaitingPeriods(Integer.parseInt(bufferedReader.readLine()));
            tmp.setUnFetched(Integer.parseInt(bufferedReader.readLine()));
            tmp.setNameDescription(bufferedReader.readLine());
            tmp.setCardExpiryDate(bufferedReader.readLine());
            tmp.setCardStatus(bufferedReader.readLine());
            tmp.setDaysUntilCardExpiry(bufferedReader.readLine());
            cards.add(tmp);
        }
        inputStream.close();
    }
}