无法在Android 10中创建目录 [英] Can't create directory in Android 10

问题描述

我无法在android 10中创建目录.直到android Oreo为止，该设备都可以在设备上使用.

I'm unable to create directory in android 10. It's working on devices till android Oreo.

我尝试了两种创建文件夹的方法.

I tried two ways for creating folders.

使用:File.mkdir():

   File f = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Pastebin");
                    if (!f.isFile()) {
                        if (!(f.isDirectory())) {
                               success =  f.mkdir();
                        }

此处，变量success始终为 false ，这意味着未创建目录.

Here, the variable success is always false which means the directory isn't created.

使用 Files.createDirectory():

   File f = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Pastebin");
                    if (!f.isFile()) {
                        if (!(f.isDirectory())) {
                            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                                try {
                                    Files.createDirectory(Paths.get(f.getAbsolutePath()));
                                } catch (IOException e) {
                                    e.printStackTrace();
                                    Toast.makeText(getApplicationContext(), R.string.unable_to_download, Toast.LENGTH_LONG).show();
                                }
                            } else {
                                f.mkdir();
                            }
                        }

这会导致此异常:

pzy64.pastebinpro W/System.err: java.nio.file.AccessDeniedException: /storage/emulated/0/Pastebin
pzy64.pastebinpro W/System.err:     at sun.nio.fs.UnixFileSystemProvider.createDirectory(UnixFileSystemProvider.java:391)
pzy64.pastebinpro W/System.err:     at java.nio.file.Files.createDirectory(Files.java:674)

我已经实现了运行时权限和

I've implemented the run-time permissions and

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

都准备好了.

推荐答案

正如2019年3月首次披露的那样，默认情况下，您不再有权访问

As was first disclosed back in March 2019, you no longer have access by default to arbitrary locations on external storage or removable storage on Android 10+. This includes Environment.getExternalStorageDirectory() and other methods on Environment (e.g., getExternalStoragePublicDirectory().

对于Android 10和11，您可以将android:requestLegacyExternalStorage="true"添加到清单中的<application>元素中.这使您可以选择旧式存储模型，并且您现有的外部存储代码将起作用.

For Android 10 and 11, you can add android:requestLegacyExternalStorage="true" to your <application> element in the manifest. This opts you into the legacy storage model, and your existing external storage code will work.

否则，您的选择是:

• 使用Context上的方法(例如getExternalFilesDir())访问应用可以写入的外部存储上的目录.您不需要任何权限即可在Android 4.4+上使用这些目录.但是，卸载应用程序后，存储在其中的数据将被删除.

• Use methods on Context, such as getExternalFilesDir(), to get at directories on external storage into which your app can write. You do not need any permissions to use those directories on Android 4.4+. However, the data that you store there gets removed when your app is uninstalled.

使用存储访问框架，例如ACTION_OPEN_DOCUMENT和ACTION_CREATE_DOCUMENT.

Use the Storage Access Framework, such as ACTION_OPEN_DOCUMENT and ACTION_CREATE_DOCUMENT.

如果您的内容是媒体，则可以使用MediaStore将媒体放置在标准媒体位置.

If your content is media, you can use MediaStore to place the media in standard media locations.

这篇关于无法在Android 10中创建目录的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！