除了android Q
以外,我的应用程序创建所有android版本的文件夹都没有问题,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();
}
答案 0 :(得分:3)
在Q中,如果您要访问的文件不是常见的音乐或媒体文件,例如sdcard/test
,则需要执行以下操作:
为了访问其他应用程序创建的任何其他文件,包括“下载”目录中的文件,您的应用程序必须使用存储访问框架,该框架允许用户选择特定文件。
引用src: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
答案 1 :(得分:0)
<manifest ... >
<!-- This attribute is "false" by default on apps targeting Android Q. ->
<application android:requestLegacyExternalStorage="true" ... >
</application>
</manifest>