无法使用 mkdir 在 Android Q 中创建文件夹

Question

我的应用程序在所有 android 版本中创建文件夹都没有问题，除了 android Q，我不知道为什么我的代码在 android q

中不起作用

这是我的代码：

File dir = new File("/sdcard/test");
       try{
              if(dir.mkdir()) {
                      Log.d("DOWNLOAD","Directory created");
              } else {
                     Log.d("DOWNLOAD","Directory is not created");
              }
            }catch(Exception e){
                  e.printStackTrace();
        }

Answer 1

在 Q 中，如果您想要访问不是普通音乐或媒体文件的文件，即在您的情况下 sdcard/test，那么您需要执行以下操作：

In order to access any other file that another app has created, including files in a "downloads" directory, your app must use the Storage Access Framework, which allows the user to select a specific file.

引用来源：http://developer.android.com/preview/privacy/scoped-storage

// Here are some examples of how you might call this method.
// The first parameter is the MIME type, and the second parameter is the name
// of the file you are creating:
//
// createFile("text/plain", "foobar.txt");
// createFile("image/png", "mypicture.png");

// Unique request code.
private const val WRITE_REQUEST_CODE: Int = 43
...
private fun createFile(mimeType: String, fileName: String) {
    val intent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
        // Filter to only show results that can be "opened", such as
        // a file (as opposed to a list of contacts or timezones).
        addCategory(Intent.CATEGORY_OPENABLE)

        // Create a file with the requested MIME type.
        type = mimeType
        putExtra(Intent.EXTRA_TITLE, fileName)
    }

    startActivityForResult(intent, WRITE_REQUEST_CODE)
}

示例 src https://developer.android.com/guide/topics/providers/document-provider

Answer 2

 <manifest ... >
 <!-- This attribute is "false" by default on apps targeting Android Q. ->
  <application android:requestLegacyExternalStorage="true" ... >

 </application>
</manifest>

无法使用 mkdir 在 Android Q 中创建文件夹

Cant Create Folder in Android Q with mkdir

java

android

mkdir

android-10.0