android - 如何获取下载文件夹中的文件名列表？

Question

我试过这个:

File f =Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);

        System.out.println(f.list());
        System.out.println(f.listFiles().toString());

但它显示为空。我已在 list 中授予读写权限。

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

Answer 1

READ_EXTERNAL_STORAGE 是危险权限你需要请求它的运行时权限

Beginning in Android 6.0 (API level 23), users grant permissions to apps while the app is running, not when they install the app.

您需要ask runtime permission

也试试这个

试试这个

private void getfiles() {
    String[] filenames = new String[0];
    ArrayList<String> fileArrayList = new ArrayList<>();
    File path = new File(Environment.getExternalStorageDirectory() + "/folder_name");
    if (path.exists()) {
        filenames = path.list();
    }
    for (int i = 0; i < filenames.length; i++) {
        fileArrayList.add(path.getPath() + "/" + filenames[i]);
        Log.e("fileArrayList", fileArrayList.get(i));

    }
}