java - 安卓工作室 : Storing Strings from a scanner in a String array from a file in/assets

Question

我目前正在尝试从我创建的/main/assets 文件夹中的 list.txt 文件中获取行。

我正在尝试将此 list.txt 文件中的每一行存储到一个字符串数组，但我不确定如何在 Android Studio 中获取与 .getLine() 等效的 java？

到目前为止，这是我的代码:

private String[] line;
private InputStream is;
private static int NUMBER_OF_LINES = 640;
public void getLines(){
    AssetManager am = getAssets();
    try {
        is = am.open("list.txt");
    }catch(Exception e){
        Log.v("GLOBAL_VARIABLES","FILE IS NOT FOUND!");
    }
    Scanner s = new Scanner(is);
    String w[] = new String[NUMBER_OF_LINES];

    for (int i =1; i<= NUMBER_OF_LINES; i++){
        w[i] = is.toString().nextLine(); // This is what i need
    }

如果我在这方面做错了什么，请告诉我。这是我制作的第一个 Android 应用程序之一。

编辑:

所以这就是我想要它做的:

Read the file

Get the first line of that file

Store that line in a String array

Go to the next line

Get that line

Store that line in the String array

Rinse + repeat until the counter is up to 640

我希望足够详细，感谢您的所有帮助!

Answer 1

刚刚确认使用 LineNumberReader 有效。

AssetManager assets = getAssets();

try {
  InputStream in = assets.open("list.txt");
  LineNumberReader lin = new LineNumberReader(new InputStreamReader(in));
  String line;
  while((line = lin.readLine()) != null) {
    Log.i(TAG, "read a line: " + line);
  }
} catch (IOException e) {
  Log.e(TAG, "Error reading assets!", e);
}

这是我的文件的内容:

line 1
line 2
line 3
this is a long line
line 4

这是我的日志输出:

11-30 13:10:32.730 2154-2154/mobappdev.assetstest I/AssetsTestLog: read a line: line 1
11-30 13:10:32.730 2154-2154/mobappdev.assetstest I/AssetsTestLog: read a line: line 2
11-30 13:10:32.730 2154-2154/mobappdev.assetstest I/AssetsTestLog: read a line: line 3
11-30 13:10:32.730 2154-2154/mobappdev.assetstest I/AssetsTestLog: read a line: this is a long line
11-30 13:10:32.730 2154-2154/mobappdev.assetstest I/AssetsTestLog: read a line: line 4

如果您提前知道文件中的行数，则可以修改 while 循环并改用 for 循环。我的文件有 5 行，所以我可以像这样重写上面的代码:

String[] lines = new String[5];
for(int i=0; i<lines.length; i++) {
  lines[i] = lin.readLine();
  Log.i(TAG, "read line: " + lines[i]);
}