我的应用程序中有一个偏好设置页面,询问用户要将文件保存到哪个位置。使用Storage Access Framework返回此位置作为URI,我能够在活动之间存储文件。问题是,在重新启动手机后,我从sharedPreferences检索URI时会收到以下内容:
DocumentFile: Failed query: java.lang.SecurityException: Permission Denial: opening provider com.android.externalstorage.ExternalStorageProvider from ProcessRecord (pid=23302, uid=10334) requires that you obtain access using ACTION_OPEN_DOCUMENT or related APIs
这里是启动意图的代码:
folderPicker = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
folderPicker.addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION)
startActivityForResult(folderPicker, READ_REQUEST_BY_USER)
并且是onActivityResult:
val takeFlags: Int = folderPicker.flags and (Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
activity!!.contentResolver!!.takePersistableUriPermission(uri, takeFlags)
val sharedPref = PreferenceManager.getDefaultSharedPreferences(activity?.baseContext)
with (sharedPref.edit()) {
putString("savePathURI", uri.toString())
commit()
}
这是我尝试重新访问文件夹的方法:
var uri = PreferenceManager.getDefaultSharedPreferences(this).getString("savePathURI","")
var getSelectedDocument = DocumentFile.fromTreeUri(applicationContext, Uri.parse(uri))!!
var params = BridgeParams(applicationContext, links, filesDir.absolutePath, button, getResources(), progressBar3, getSelectedDocument, contentResolver)
编辑:我注意到调用contentResolver.persistedUriPermissions总是返回一个空数组,即使我在调用它之后立即调用它:
activity!!.contentResolver!!.takePersistableUriPermission(uri, takeFlags)
startActivityForResult
时它可以工作,但是当我使用registerForActivityResult
时却不行,你能告诉我为什么吗? - Bhavin Patel