如何在Android11中创建自定义文件夹（应用程序文件夹

Question

  Im facing a problem when creating app custom folder. like 

通过使用android 11（SDK API 30）设备下面的一些方法

但在Android11中运行良好。无法使用如下所示的方法使其im

 public static String root= Environment.getExternalStorageDirectory().toString();
 public static final String app_hided_folder ="/.HidedAPPTop/";
 public static final String app_showing_folder ="/APPTop/";
 public static final String draft_app_folder= app_hided_folder +"Draft/";


  public static void make_directry(String path,Context context) {
    File dir = new File(path);

    if (!dir.exists())
        Toast.makeText(context,
                (dir.mkdirs() ? "Directory has been created" : "Directory not created"),
                Toast.LENGTH_SHORT).show();
    else
        Toast.makeText(context, "Directory exists", Toast.LENGTH_SHORT).show();
}

函数调用

make_directry(Variables.app_hided_folder,getContext());

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

 <application
     …
        android:requestLegacyExternalStorage="true"
     …
       >

uri是我从拾取器的响应中获得的视频路径。

File video_file = new File(uri.getPath());
            Log.d(Variables.tag + " new path", video_file.getAbsolutePath());
            Functions.copyFile(video_file,
                    new File(Variables.gallery_resize_video));

copyFile的函数调用

public static void copyFile(File sourceFile, File destFile) throws IOException {


        if (!destFile.getParentFile().exists())
            destFile.getParentFile().mkdirs();

        if (!destFile.exists()) {
            destFile.createNewFile();
        }

        FileChannel source = null;
        FileChannel destination = null;

        try {
            source = new FileInputStream(sourceFile).getChannel();
            destination = new FileOutputStream(destFile).getChannel();
            destination.transferFrom(source, 0, source.size());
        } finally {
            if (source != null) {
                source.close();
            }
            if (destination != null) {
                destination.close();
            }
        }
    }

错误：new ；path:/storage/emulated/0/download/stop/mp4_20210128225711.mp4 system.err:java.io.fileNotfoundexception:/storage/emulated/0/download/.hidedtop/gallery_resize_video.mp4:打开失败：EACCES（拒绝权限）

和应用程序在目的地崩溃=

新建FileOutputStream（destFile）.getChannel（）；

Answer 1

通过使用下面的片段，我的问题解决了。

Environment.GetExternalStoragePublicDirectory(Environment.Directory_DCIM)

不推荐使用.GetExternalStoragePublicDirectory()。