android - 从 Android 设备 sdcard 中的 txt 文件中读取数据

Question

我想从文件中读取数据：

    FileInputStream in = openFileInput(file);
    InputStreamReader inputStreamReader = new InputStreamReader(in);
    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

但我不知道“文件”。我希望用户告诉我文件在哪里。我想让他用文件管理器搜索文件。我该怎么办？我希望我解释了自己并对英语感到抱歉。提前致谢。

Answer 1

试试这段代码，你可以在网上找到很多例子

 File sdcard = Environment.getExternalStorageDirectory();

//Get the text file
File file = new File(sdcard,"file.txt");

//Read text from file
StringBuilder text = new StringBuilder();

try {
 BufferedReader br = new BufferedReader(new FileReader(file));
 String line;

 while ((line = br.readLine()) != null) {
    text.append(line);
    text.append('\n');
 }
} catch (IOException e) {
//You'll need to add proper error handling here
}