如何在 Android 中读取文件

Question

我有一个名为“high.txt”的文本文件。我需要我的 Android 应用程序内部的数据。但我完全不知道如何将它读入字符串的 ArrayList。我尝试了在 Java 中执行此操作的正常方法，但显然这在 Android 中不起作用，因为它找不到文件。那么我该怎么做呢？我已经把它放在我的 res 文件夹中了。但是，您如何获取在 Android 中打开文件所获得的输入流并将其读入字符串的 ArrayList。我被困在那部分了。

基本上它看起来像这样：

3.  What do you do for an upcoming test?
L: make sure I know what I'm studying and really review and study for this thing. Its what Im good at. Understand the material really well.
CL: Time to study. I got this, but I really need to make sure I know it,
M: Tests can be tough, but there are tips and tricks. Focus on the important, interesting stuff. Cram in all the little details just to get past this test. 
CR: -sigh- I don't like these tests. Hope I've studied enough to pass or maybe do well.
R: Screw the test. I'll study later, day before should be good.

这是一个示例问题，所有行都将作为单独的字符串存储在数组列表中。

Answer 1

//find all files from folder /assets/txt/

String[] elements;

try {
    elements = getAssets().list("txt");
} catch (IOException e) {
    e.printStackTrace();
}

//for every files read text per line
for (String fileName : elements) {
    Log.d("xxx", "File: " + fileName);

    try {
        InputStream open = getAssets().open("txt/" + fileName);
        InputStreamReader inputStreamReader = new InputStreamReader(open);
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        String line = "";

        while ((line = bufferedReader.readLine()) != null) {
            Log.d("xxx", line);     
        }

    } catch (IOException e) {
        e.printStackTrace();
    }
}

Answer 2

如果你想从外部存储中读取文件而不是使用下面的方法。

public void readFileFromExternal(){
    String path = Environment.getExternalStorageDirectory().getPath()
               + "/AppTextFile.txt";
    try {
        BufferedReader reader = new BufferedReader(new FileReader(path));
        String line, results = "";
        while( ( line = reader.readLine() ) != null)
        {
            results += line;
        }
        reader.close();
                Log.d("FILE","Data in your file : " + results);
      } catch (Exception e) {
    }
}

Answer 3

如果您将文本文件放在资产文件夹中，您可以使用我从我的一个项目中获取和修改的类似代码：

public static void importData(Context context) {
    try {
        BufferedReader br = new BufferedReader(new InputStreamReader(context.getAssets().open("high.txt")));

        String line;

        while ((line = br.readLine()) != null) {
            String[] columns = line.split(",");

            Model model = new Model();

            model.date = DateUtil.getCalendar(columns[0], "MM/dd/yyyy");
            model.name = columns[1];

            dbHelper.insertModel(model);
        }

    } catch (IOException e) {
        e.printStackTrace();
    }
}

在循环中，您可以对列执行任何您需要的操作，此示例所做的是从每一行创建一个对象并将其保存在数据库中。

对于这个例子，文本文件看起来像这样：

15/04/2013,Bob
03/03/2013,John
21/04/2013,Steve