如何在安卓系统中从.txt文件中获取数据

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

try {
    File file = new File(Environment.getExternalStorageDirectory(), "filename.txt");
    FileReader fileReader = new FileReader(file);
    BufferedReader bufferedReader = new BufferedReader(fileReader);
    StringBuilder stringBuilder = new StringBuilder();
    String line;
    while ((line = bufferedReader.readLine()) != null) {
        stringBuilder.append(line);
    }
    bufferedReader.close();
    String data = stringBuilder.toString();
    // 在这里可以对获取到的数据进行处理或使用
} catch (IOException e) {
    e.printStackTrace();
}

if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, REQUEST_CODE);
}