我想从SD卡中删除重复的文件。所以我需要访问SD卡文件,该文件为我提供了完整路径。例如。 /storage/0C08-291C/Android/Docs/file-sample_500kB.rtf
我获得了所有大于 SDK 22级的Android版本的SD卡路径,但无法在 Android 8 Oreo 8.0版中访问SD卡和版本8.1 SDK级别26和27 。
我正在使用以下方法获取SD卡的根路径:
public static String getExternalStoragePath(Context mContext,boolean is_removable) {
StorageManager mStorageManager = (StorageManager) mContext.getSystemService(Context.STORAGE_SERVICE);
Class<?> storageVolumeclazz = null;
try {
storageVolumeclazz = Class.forName("android.os.storage.StorageVolume");
Method getVolumeList = mStorageManager.getclass().getMethod("getVolumeList");
Method getPath = storageVolumeclazz.getMethod("getPath");
Method isremovable = storageVolumeclazz.getMethod("isremovable");
Object result = getVolumeList.invoke(mStorageManager);
final int length = Array.getLength(result);
for (int i = 0; i < length; i++) {
Object storageVolumeElement = Array.get(result,i);
String path = (String) getPath.invoke(storageVolumeElement);
boolean removable = (Boolean) isremovable.invoke(storageVolumeElement);
if (is_removable == removable) {
return path;
}
}
} catch (ClassnotFoundException | invocationTargetException | NoSuchMethodException | IllegalaccessException e) {
e.printStackTrace();
}
return null;
}
即使SD卡的安装状态为 true ,此方法在Android版本8上也会返回 null 。
我正在使用以下行检查SD卡的状态:
boolean isSDPresent = android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
并将SD卡路径获取为:
String externalSdCard = getExternalStoragePath(mContext,true);
一旦我获得了 externalSdCard ,我将调用以下方法将 GRANT URI PERMISSION 授予 SD卡。
public void takeCardUriPermission(String sdCardRootPath) {
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
File sdCard = new File(sdCardRootPath);
StorageManager storageManager = (StorageManager) getSystemService(Context.STORAGE_SERVICE);
StorageVolume storageVolume = storageManager.getStorageVolume(sdCard);
Intent intent = null;
if (storageVolume != null) {
intent = storageVolume.createaccessIntent(null);
}
try {
startactivityForResult(intent,REQUEST_CODE_OPEN_DOCUMENT_TREE);
} catch (activityNotFoundException e) {
e.printStackTrace();
}
}
}
要调用 takeCardUriPermission(String sdCardRootPath)方法,我需要 SD卡根路径。我的问题是这个“如何在Android 8 Oreo上获取SD卡的根路径”