If the app targets Android 8.0 (API level 26), the system grants only
READ_EXTERNAL_STORAGE at that time; however, if the app later requests
WRITE_EXTERNAL_STORAGE, the system immediately grants that privilege
without prompting the user.
现在,我有READ_EXTERNAL_STORAGE,我正在请求DownloadManager下载Public Download文件夹中的文件
downloadRequest.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, mAttachmentItem.getFilename());
不幸的是,我得到了
E/UncaughtException: java.lang.IllegalStateException: Unable to create directory: /storage/emulated/0/data/user/0/com.abc.cba/files
at android.app.DownloadManager$Request.setDestinationInExternalPublicDir(DownloadManager.java:699)
我在Manifest中声明了两个权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
读取权限已被授予,在运行时我正在请求写入权限,系统不会提示任何消息或对话框,它总是在"onRequestPermissionsResult"中被拒绝(未授予)
public static boolean isPermissionsToAccessStorageAreGranted(Context context, Activity activity) {
ArrayList<String> permissions = new ArrayList<>();
if (!PermissionUtil.checkPermissions(context, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
permissions.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
}
if (!permissions.isEmpty()) { …