2 * Copyright (C) 2007 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 import android.app.admin.DevicePolicyManager;
20 import android.content.Context;
21 import android.os.storage.StorageManager;
22 import android.os.storage.StorageVolume;
23 import android.text.TextUtils;
24 import android.util.Log;
29 * Provides access to environment variables.
31 public class Environment {
32 private static final String TAG = "Environment";
34 private static final String ENV_EXTERNAL_STORAGE = "EXTERNAL_STORAGE";
35 private static final String ENV_ANDROID_ROOT = "ANDROID_ROOT";
36 private static final String ENV_ANDROID_DATA = "ANDROID_DATA";
37 private static final String ENV_ANDROID_EXPAND = "ANDROID_EXPAND";
38 private static final String ENV_ANDROID_STORAGE = "ANDROID_STORAGE";
39 private static final String ENV_DOWNLOAD_CACHE = "DOWNLOAD_CACHE";
40 private static final String ENV_OEM_ROOT = "OEM_ROOT";
41 private static final String ENV_ODM_ROOT = "ODM_ROOT";
42 private static final String ENV_VENDOR_ROOT = "VENDOR_ROOT";
45 public static final String DIR_ANDROID = "Android";
46 private static final String DIR_DATA = "data";
47 private static final String DIR_MEDIA = "media";
48 private static final String DIR_OBB = "obb";
49 private static final String DIR_FILES = "files";
50 private static final String DIR_CACHE = "cache";
54 public static final String DIRECTORY_ANDROID = DIR_ANDROID;
56 private static final File DIR_ANDROID_ROOT = getDirectory(ENV_ANDROID_ROOT, "/system");
57 private static final File DIR_ANDROID_DATA = getDirectory(ENV_ANDROID_DATA, "/data");
58 private static final File DIR_ANDROID_EXPAND = getDirectory(ENV_ANDROID_EXPAND, "/mnt/expand");
59 private static final File DIR_ANDROID_STORAGE = getDirectory(ENV_ANDROID_STORAGE, "/storage");
60 private static final File DIR_DOWNLOAD_CACHE = getDirectory(ENV_DOWNLOAD_CACHE, "/cache");
61 private static final File DIR_OEM_ROOT = getDirectory(ENV_OEM_ROOT, "/oem");
62 private static final File DIR_ODM_ROOT = getDirectory(ENV_ODM_ROOT, "/odm");
63 private static final File DIR_VENDOR_ROOT = getDirectory(ENV_VENDOR_ROOT, "/vendor");
65 private static UserEnvironment sCurrentUser;
66 private static boolean sUserRequired;
73 public static void initForCurrentUser() {
74 final int userId = UserHandle.myUserId();
75 sCurrentUser = new UserEnvironment(userId);
79 public static class UserEnvironment {
80 private final int mUserId;
82 public UserEnvironment(int userId) {
86 public File[] getExternalDirs() {
87 final StorageVolume[] volumes = StorageManager.getVolumeList(mUserId,
88 StorageManager.FLAG_FOR_WRITE);
89 final File[] files = new File[volumes.length];
90 for (int i = 0; i < volumes.length; i++) {
91 files[i] = volumes[i].getPathFile();
97 public File getExternalStorageDirectory() {
98 return getExternalDirs()[0];
102 public File getExternalStoragePublicDirectory(String type) {
103 return buildExternalStoragePublicDirs(type)[0];
106 public File[] buildExternalStoragePublicDirs(String type) {
107 return buildPaths(getExternalDirs(), type);
110 public File[] buildExternalStorageAndroidDataDirs() {
111 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA);
114 public File[] buildExternalStorageAndroidObbDirs() {
115 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_OBB);
118 public File[] buildExternalStorageAppDataDirs(String packageName) {
119 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA, packageName);
122 public File[] buildExternalStorageAppMediaDirs(String packageName) {
123 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_MEDIA, packageName);
126 public File[] buildExternalStorageAppObbDirs(String packageName) {
127 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_OBB, packageName);
130 public File[] buildExternalStorageAppFilesDirs(String packageName) {
131 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA, packageName, DIR_FILES);
134 public File[] buildExternalStorageAppCacheDirs(String packageName) {
135 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA, packageName, DIR_CACHE);
140 * Return root of the "system" partition holding the core Android OS.
141 * Always present and mounted read-only.
143 public static File getRootDirectory() {
144 return DIR_ANDROID_ROOT;
148 public static File getStorageDirectory() {
149 return DIR_ANDROID_STORAGE;
153 * Return root directory of the "oem" partition holding OEM customizations,
154 * if any. If present, the partition is mounted read-only.
158 public static File getOemDirectory() {
163 * Return root directory of the "odm" partition holding ODM customizations,
164 * if any. If present, the partition is mounted read-only.
168 public static File getOdmDirectory() {
173 * Return root directory of the "vendor" partition that holds vendor-provided
174 * software that should persist across simple reflashing of the "system" partition.
177 public static File getVendorDirectory() {
178 return DIR_VENDOR_ROOT;
182 * Return the system directory for a user. This is for use by system
183 * services to store files relating to the user. This directory will be
184 * automatically deleted when the user is removed.
186 * @deprecated This directory is valid and still exists, but callers should
187 * <em>strongly</em> consider switching to
188 * {@link #getDataSystemCeDirectory(int)} which is protected
189 * with user credentials or
190 * {@link #getDataSystemDeDirectory(int)} which supports fast
195 public static File getUserSystemDirectory(int userId) {
196 return new File(new File(getDataSystemDirectory(), "users"), Integer.toString(userId));
200 * Returns the config directory for a user. This is for use by system
201 * services to store files relating to the user which should be readable by
202 * any app running as that user.
204 * @deprecated This directory is valid and still exists, but callers should
205 * <em>strongly</em> consider switching to
206 * {@link #getDataMiscCeDirectory(int)} which is protected with
207 * user credentials or {@link #getDataMiscDeDirectory(int)}
208 * which supports fast user wipe.
212 public static File getUserConfigDirectory(int userId) {
213 return new File(new File(new File(
214 getDataDirectory(), "misc"), "user"), Integer.toString(userId));
218 * Return the user data directory.
220 public static File getDataDirectory() {
221 return DIR_ANDROID_DATA;
225 public static File getDataDirectory(String volumeUuid) {
226 if (TextUtils.isEmpty(volumeUuid)) {
227 return DIR_ANDROID_DATA;
229 return new File("/mnt/expand/" + volumeUuid);
234 public static File getExpandDirectory() {
235 return DIR_ANDROID_EXPAND;
239 public static File getDataSystemDirectory() {
240 return new File(getDataDirectory(), "system");
244 * Returns the base directory for per-user system directory, device encrypted.
247 public static File getDataSystemDeDirectory() {
248 return buildPath(getDataDirectory(), "system_de");
252 * Returns the base directory for per-user system directory, credential encrypted.
255 public static File getDataSystemCeDirectory() {
256 return buildPath(getDataDirectory(), "system_ce");
260 public static File getDataSystemCeDirectory(int userId) {
261 return buildPath(getDataDirectory(), "system_ce", String.valueOf(userId));
265 public static File getDataSystemDeDirectory(int userId) {
266 return buildPath(getDataDirectory(), "system_de", String.valueOf(userId));
270 public static File getDataMiscDirectory() {
271 return new File(getDataDirectory(), "misc");
275 public static File getDataMiscCeDirectory(int userId) {
276 return buildPath(getDataDirectory(), "misc_ce", String.valueOf(userId));
280 public static File getDataMiscDeDirectory(int userId) {
281 return buildPath(getDataDirectory(), "misc_de", String.valueOf(userId));
284 private static File getDataProfilesDeDirectory(int userId) {
285 return buildPath(getDataDirectory(), "misc", "profiles", "cur", String.valueOf(userId));
289 public static File getReferenceProfile(String packageName) {
290 return buildPath(getDataDirectory(), "misc", "profiles", "ref", packageName);
294 public static File getDataProfilesDePackageDirectory(int userId, String packageName) {
295 return buildPath(getDataProfilesDeDirectory(userId), packageName);
299 public static File getDataProfilesDeForeignDexDirectory(int userId) {
300 return buildPath(getDataProfilesDeDirectory(userId), "foreign-dex");
304 public static File getDataAppDirectory(String volumeUuid) {
305 return new File(getDataDirectory(volumeUuid), "app");
309 public static File getDataAppEphemeralDirectory(String volumeUuid) {
310 return new File(getDataDirectory(volumeUuid), "app-ephemeral");
314 public static File getDataUserCeDirectory(String volumeUuid) {
315 return new File(getDataDirectory(volumeUuid), "user");
319 public static File getDataUserCeDirectory(String volumeUuid, int userId) {
320 return new File(getDataUserCeDirectory(volumeUuid), String.valueOf(userId));
324 public static File getDataUserCePackageDirectory(String volumeUuid, int userId,
325 String packageName) {
326 // TODO: keep consistent with installd
327 return new File(getDataUserCeDirectory(volumeUuid, userId), packageName);
331 public static File getDataUserDeDirectory(String volumeUuid) {
332 return new File(getDataDirectory(volumeUuid), "user_de");
336 public static File getDataUserDeDirectory(String volumeUuid, int userId) {
337 return new File(getDataUserDeDirectory(volumeUuid), String.valueOf(userId));
341 public static File getDataUserDePackageDirectory(String volumeUuid, int userId,
342 String packageName) {
343 // TODO: keep consistent with installd
344 return new File(getDataUserDeDirectory(volumeUuid, userId), packageName);
348 * Return preloads directory.
349 * <p>This directory may contain pre-loaded content such as
350 * {@link #getDataPreloadsDemoDirectory() demo videos} and
351 * {@link #getDataPreloadsAppsDirectory() APK files} .
354 public static File getDataPreloadsDirectory() {
355 return new File(getDataDirectory(), "preloads");
359 * @see #getDataPreloadsDirectory()
362 public static File getDataPreloadsDemoDirectory() {
363 return new File(getDataPreloadsDirectory(), "demo");
367 * @see #getDataPreloadsDirectory()
370 public static File getDataPreloadsAppsDirectory() {
371 return new File(getDataPreloadsDirectory(), "apps");
375 * @see #getDataPreloadsDirectory()
378 public static File getDataPreloadsMediaDirectory() {
379 return new File(getDataPreloadsDirectory(), "media");
383 * Return the primary shared/external storage directory. This directory may
384 * not currently be accessible if it has been mounted by the user on their
385 * computer, has been removed from the device, or some other problem has
386 * happened. You can determine its current state with
387 * {@link #getExternalStorageState()}.
389 * <em>Note: don't be confused by the word "external" here. This directory
390 * can better be thought as media/shared storage. It is a filesystem that
391 * can hold a relatively large amount of data and that is shared across all
392 * applications (does not enforce permissions). Traditionally this is an SD
393 * card, but it may also be implemented as built-in storage in a device that
394 * is distinct from the protected internal storage and can be mounted as a
395 * filesystem on a computer.</em>
397 * On devices with multiple users (as described by {@link UserManager}),
398 * each user has their own isolated shared storage. Applications only have
399 * access to the shared storage for the user they're running as.
401 * In devices with multiple shared/external storage directories, this
402 * directory represents the primary storage that the user will interact
403 * with. Access to secondary storage is available through
404 * {@link Context#getExternalFilesDirs(String)},
405 * {@link Context#getExternalCacheDirs()}, and
406 * {@link Context#getExternalMediaDirs()}.
408 * Applications should not directly use this top-level directory, in order
409 * to avoid polluting the user's root namespace. Any files that are private
410 * to the application should be placed in a directory returned by
411 * {@link android.content.Context#getExternalFilesDir
412 * Context.getExternalFilesDir}, which the system will take care of deleting
413 * if the application is uninstalled. Other shared files should be placed in
414 * one of the directories returned by
415 * {@link #getExternalStoragePublicDirectory}.
417 * Writing to this path requires the
418 * {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE} permission,
419 * and starting in {@link android.os.Build.VERSION_CODES#KITKAT}, read access requires the
420 * {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission,
421 * which is automatically granted if you hold the write permission.
423 * Starting in {@link android.os.Build.VERSION_CODES#KITKAT}, if your
424 * application only needs to store internal data, consider using
425 * {@link Context#getExternalFilesDir(String)},
426 * {@link Context#getExternalCacheDir()}, or
427 * {@link Context#getExternalMediaDirs()}, which require no permissions to
430 * This path may change between platform versions, so applications should
431 * only persist relative paths.
433 * Here is an example of typical code to monitor the state of external
436 * {@sample development/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.java
439 * @see #getExternalStorageState()
440 * @see #isExternalStorageRemovable()
442 public static File getExternalStorageDirectory() {
443 throwIfUserRequired();
444 return sCurrentUser.getExternalDirs()[0];
448 public static File getLegacyExternalStorageDirectory() {
449 return new File(System.getenv(ENV_EXTERNAL_STORAGE));
453 public static File getLegacyExternalStorageObbDirectory() {
454 return buildPath(getLegacyExternalStorageDirectory(), DIR_ANDROID, DIR_OBB);
458 * Standard directory in which to place any audio files that should be
459 * in the regular list of music for the user.
460 * This may be combined with
461 * {@link #DIRECTORY_PODCASTS}, {@link #DIRECTORY_NOTIFICATIONS},
462 * {@link #DIRECTORY_ALARMS}, and {@link #DIRECTORY_RINGTONES} as a series
463 * of directories to categories a particular audio file as more than one
466 public static String DIRECTORY_MUSIC = "Music";
469 * Standard directory in which to place any audio files that should be
470 * in the list of podcasts that the user can select (not as regular
472 * This may be combined with {@link #DIRECTORY_MUSIC},
473 * {@link #DIRECTORY_NOTIFICATIONS},
474 * {@link #DIRECTORY_ALARMS}, and {@link #DIRECTORY_RINGTONES} as a series
475 * of directories to categories a particular audio file as more than one
478 public static String DIRECTORY_PODCASTS = "Podcasts";
481 * Standard directory in which to place any audio files that should be
482 * in the list of ringtones that the user can select (not as regular
484 * This may be combined with {@link #DIRECTORY_MUSIC},
485 * {@link #DIRECTORY_PODCASTS}, {@link #DIRECTORY_NOTIFICATIONS}, and
486 * {@link #DIRECTORY_ALARMS} as a series
487 * of directories to categories a particular audio file as more than one
490 public static String DIRECTORY_RINGTONES = "Ringtones";
493 * Standard directory in which to place any audio files that should be
494 * in the list of alarms that the user can select (not as regular
496 * This may be combined with {@link #DIRECTORY_MUSIC},
497 * {@link #DIRECTORY_PODCASTS}, {@link #DIRECTORY_NOTIFICATIONS},
498 * and {@link #DIRECTORY_RINGTONES} as a series
499 * of directories to categories a particular audio file as more than one
502 public static String DIRECTORY_ALARMS = "Alarms";
505 * Standard directory in which to place any audio files that should be
506 * in the list of notifications that the user can select (not as regular
508 * This may be combined with {@link #DIRECTORY_MUSIC},
509 * {@link #DIRECTORY_PODCASTS},
510 * {@link #DIRECTORY_ALARMS}, and {@link #DIRECTORY_RINGTONES} as a series
511 * of directories to categories a particular audio file as more than one
514 public static String DIRECTORY_NOTIFICATIONS = "Notifications";
517 * Standard directory in which to place pictures that are available to
518 * the user. Note that this is primarily a convention for the top-level
519 * public directory, as the media scanner will find and collect pictures
522 public static String DIRECTORY_PICTURES = "Pictures";
525 * Standard directory in which to place movies that are available to
526 * the user. Note that this is primarily a convention for the top-level
527 * public directory, as the media scanner will find and collect movies
530 public static String DIRECTORY_MOVIES = "Movies";
533 * Standard directory in which to place files that have been downloaded by
534 * the user. Note that this is primarily a convention for the top-level
535 * public directory, you are free to download files anywhere in your own
536 * private directories. Also note that though the constant here is
537 * named DIRECTORY_DOWNLOADS (plural), the actual file name is non-plural for
538 * backwards compatibility reasons.
540 public static String DIRECTORY_DOWNLOADS = "Download";
543 * The traditional location for pictures and videos when mounting the
544 * device as a camera. Note that this is primarily a convention for the
545 * top-level public directory, as this convention makes no sense elsewhere.
547 public static String DIRECTORY_DCIM = "DCIM";
550 * Standard directory in which to place documents that have been created by
553 public static String DIRECTORY_DOCUMENTS = "Documents";
556 * List of standard storage directories.
558 * Each of its values have its own constant:
560 * <li>{@link #DIRECTORY_MUSIC}
561 * <li>{@link #DIRECTORY_PODCASTS}
562 * <li>{@link #DIRECTORY_ALARMS}
563 * <li>{@link #DIRECTORY_RINGTONES}
564 * <li>{@link #DIRECTORY_NOTIFICATIONS}
565 * <li>{@link #DIRECTORY_PICTURES}
566 * <li>{@link #DIRECTORY_MOVIES}
567 * <li>{@link #DIRECTORY_DOWNLOADS}
568 * <li>{@link #DIRECTORY_DCIM}
569 * <li>{@link #DIRECTORY_DOCUMENTS}
573 public static final String[] STANDARD_DIRECTORIES = {
578 DIRECTORY_NOTIFICATIONS,
589 public static boolean isStandardDirectory(String dir) {
590 for (String valid : STANDARD_DIRECTORIES) {
591 if (valid.equals(dir)) {
599 * Get a top-level shared/external storage directory for placing files of a
600 * particular type. This is where the user will typically place and manage
601 * their own files, so you should be careful about what you put here to
602 * ensure you don't erase their files or get in the way of their own
605 * On devices with multiple users (as described by {@link UserManager}),
606 * each user has their own isolated shared storage. Applications only have
607 * access to the shared storage for the user they're running as.
610 * Here is an example of typical code to manipulate a picture on the public
613 * {@sample development/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.java
616 * @param type The type of storage directory to return. Should be one of
617 * {@link #DIRECTORY_MUSIC}, {@link #DIRECTORY_PODCASTS},
618 * {@link #DIRECTORY_RINGTONES}, {@link #DIRECTORY_ALARMS},
619 * {@link #DIRECTORY_NOTIFICATIONS}, {@link #DIRECTORY_PICTURES},
620 * {@link #DIRECTORY_MOVIES}, {@link #DIRECTORY_DOWNLOADS},
621 * {@link #DIRECTORY_DCIM}, or {@link #DIRECTORY_DOCUMENTS}. May not be null.
622 * @return Returns the File path for the directory. Note that this directory
623 * may not yet exist, so you must make sure it exists before using
624 * it such as with {@link File#mkdirs File.mkdirs()}.
626 public static File getExternalStoragePublicDirectory(String type) {
627 throwIfUserRequired();
628 return sCurrentUser.buildExternalStoragePublicDirs(type)[0];
632 * Returns the path for android-specific data on the SD card.
635 public static File[] buildExternalStorageAndroidDataDirs() {
636 throwIfUserRequired();
637 return sCurrentUser.buildExternalStorageAndroidDataDirs();
641 * Generates the raw path to an application's data
644 public static File[] buildExternalStorageAppDataDirs(String packageName) {
645 throwIfUserRequired();
646 return sCurrentUser.buildExternalStorageAppDataDirs(packageName);
650 * Generates the raw path to an application's media
653 public static File[] buildExternalStorageAppMediaDirs(String packageName) {
654 throwIfUserRequired();
655 return sCurrentUser.buildExternalStorageAppMediaDirs(packageName);
659 * Generates the raw path to an application's OBB files
662 public static File[] buildExternalStorageAppObbDirs(String packageName) {
663 throwIfUserRequired();
664 return sCurrentUser.buildExternalStorageAppObbDirs(packageName);
668 * Generates the path to an application's files.
671 public static File[] buildExternalStorageAppFilesDirs(String packageName) {
672 throwIfUserRequired();
673 return sCurrentUser.buildExternalStorageAppFilesDirs(packageName);
677 * Generates the path to an application's cache.
680 public static File[] buildExternalStorageAppCacheDirs(String packageName) {
681 throwIfUserRequired();
682 return sCurrentUser.buildExternalStorageAppCacheDirs(packageName);
686 * Return the download/cache content directory.
688 public static File getDownloadCacheDirectory() {
689 return DIR_DOWNLOAD_CACHE;
693 * Unknown storage state, such as when a path isn't backed by known storage
696 * @see #getExternalStorageState(File)
698 public static final String MEDIA_UNKNOWN = "unknown";
701 * Storage state if the media is not present.
703 * @see #getExternalStorageState(File)
705 public static final String MEDIA_REMOVED = "removed";
708 * Storage state if the media is present but not mounted.
710 * @see #getExternalStorageState(File)
712 public static final String MEDIA_UNMOUNTED = "unmounted";
715 * Storage state if the media is present and being disk-checked.
717 * @see #getExternalStorageState(File)
719 public static final String MEDIA_CHECKING = "checking";
722 * Storage state if the media is present but is blank or is using an
723 * unsupported filesystem.
725 * @see #getExternalStorageState(File)
727 public static final String MEDIA_NOFS = "nofs";
730 * Storage state if the media is present and mounted at its mount point with
733 * @see #getExternalStorageState(File)
735 public static final String MEDIA_MOUNTED = "mounted";
738 * Storage state if the media is present and mounted at its mount point with
741 * @see #getExternalStorageState(File)
743 public static final String MEDIA_MOUNTED_READ_ONLY = "mounted_ro";
746 * Storage state if the media is present not mounted, and shared via USB
749 * @see #getExternalStorageState(File)
751 public static final String MEDIA_SHARED = "shared";
754 * Storage state if the media was removed before it was unmounted.
756 * @see #getExternalStorageState(File)
758 public static final String MEDIA_BAD_REMOVAL = "bad_removal";
761 * Storage state if the media is present but cannot be mounted. Typically
762 * this happens if the file system on the media is corrupted.
764 * @see #getExternalStorageState(File)
766 public static final String MEDIA_UNMOUNTABLE = "unmountable";
769 * Storage state if the media is in the process of being ejected.
771 * @see #getExternalStorageState(File)
773 public static final String MEDIA_EJECTING = "ejecting";
776 * Returns the current state of the primary shared/external storage media.
778 * @see #getExternalStorageDirectory()
779 * @return one of {@link #MEDIA_UNKNOWN}, {@link #MEDIA_REMOVED},
780 * {@link #MEDIA_UNMOUNTED}, {@link #MEDIA_CHECKING},
781 * {@link #MEDIA_NOFS}, {@link #MEDIA_MOUNTED},
782 * {@link #MEDIA_MOUNTED_READ_ONLY}, {@link #MEDIA_SHARED},
783 * {@link #MEDIA_BAD_REMOVAL}, or {@link #MEDIA_UNMOUNTABLE}.
785 public static String getExternalStorageState() {
786 final File externalDir = sCurrentUser.getExternalDirs()[0];
787 return getExternalStorageState(externalDir);
791 * @deprecated use {@link #getExternalStorageState(File)}
794 public static String getStorageState(File path) {
795 return getExternalStorageState(path);
799 * Returns the current state of the shared/external storage media at the
802 * @return one of {@link #MEDIA_UNKNOWN}, {@link #MEDIA_REMOVED},
803 * {@link #MEDIA_UNMOUNTED}, {@link #MEDIA_CHECKING},
804 * {@link #MEDIA_NOFS}, {@link #MEDIA_MOUNTED},
805 * {@link #MEDIA_MOUNTED_READ_ONLY}, {@link #MEDIA_SHARED},
806 * {@link #MEDIA_BAD_REMOVAL}, or {@link #MEDIA_UNMOUNTABLE}.
808 public static String getExternalStorageState(File path) {
809 final StorageVolume volume = StorageManager.getStorageVolume(path, UserHandle.myUserId());
810 if (volume != null) {
811 return volume.getState();
813 return MEDIA_UNKNOWN;
818 * Returns whether the primary shared/external storage media is physically
821 * @return true if the storage device can be removed (such as an SD card),
822 * or false if the storage device is built in and cannot be
823 * physically removed.
825 public static boolean isExternalStorageRemovable() {
826 if (isStorageDisabled()) return false;
827 final File externalDir = sCurrentUser.getExternalDirs()[0];
828 return isExternalStorageRemovable(externalDir);
832 * Returns whether the shared/external storage media at the given path is
833 * physically removable.
835 * @return true if the storage device can be removed (such as an SD card),
836 * or false if the storage device is built in and cannot be
837 * physically removed.
838 * @throws IllegalArgumentException if the path is not a valid storage
841 public static boolean isExternalStorageRemovable(File path) {
842 final StorageVolume volume = StorageManager.getStorageVolume(path, UserHandle.myUserId());
843 if (volume != null) {
844 return volume.isRemovable();
846 throw new IllegalArgumentException("Failed to find storage device at " + path);
851 * Returns whether the primary shared/external storage media is emulated.
853 * The contents of emulated storage devices are backed by a private user
854 * data partition, which means there is little benefit to apps storing data
855 * here instead of the private directories returned by
856 * {@link Context#getFilesDir()}, etc.
858 * This returns true when emulated storage is backed by either internal
859 * storage or an adopted storage device.
861 * @see DevicePolicyManager#setStorageEncryption(android.content.ComponentName,
864 public static boolean isExternalStorageEmulated() {
865 if (isStorageDisabled()) return false;
866 final File externalDir = sCurrentUser.getExternalDirs()[0];
867 return isExternalStorageEmulated(externalDir);
871 * Returns whether the shared/external storage media at the given path is
874 * The contents of emulated storage devices are backed by a private user
875 * data partition, which means there is little benefit to apps storing data
876 * here instead of the private directories returned by
877 * {@link Context#getFilesDir()}, etc.
879 * This returns true when emulated storage is backed by either internal
880 * storage or an adopted storage device.
882 * @throws IllegalArgumentException if the path is not a valid storage
885 public static boolean isExternalStorageEmulated(File path) {
886 final StorageVolume volume = StorageManager.getStorageVolume(path, UserHandle.myUserId());
887 if (volume != null) {
888 return volume.isEmulated();
890 throw new IllegalArgumentException("Failed to find storage device at " + path);
894 static File getDirectory(String variableName, String defaultPath) {
895 String path = System.getenv(variableName);
896 return path == null ? new File(defaultPath) : new File(path);
900 public static void setUserRequired(boolean userRequired) {
901 sUserRequired = userRequired;
904 private static void throwIfUserRequired() {
906 Log.wtf(TAG, "Path requests must specify a user by using UserEnvironment",
912 * Append path segments to each given base path, returning result.
916 public static File[] buildPaths(File[] base, String... segments) {
917 File[] result = new File[base.length];
918 for (int i = 0; i < base.length; i++) {
919 result[i] = buildPath(base[i], segments);
925 * Append path segments to given base path, returning result.
929 public static File buildPath(File base, String... segments) {
931 for (String segment : segments) {
933 cur = new File(segment);
935 cur = new File(cur, segment);
941 private static boolean isStorageDisabled() {
942 return SystemProperties.getBoolean("config.disable_storage", false);
946 * If the given path exists on emulated external storage, return the
947 * translated backing path hosted on internal storage. This bypasses any
948 * emulation later, improving performance. This is <em>only</em> suitable
949 * for read-only access.
951 * Returns original path if given path doesn't meet these criteria. Callers
952 * must hold {@link android.Manifest.permission#WRITE_MEDIA_STORAGE}
957 public static File maybeTranslateEmulatedPathToInternal(File path) {
958 return StorageManager.maybeTranslateEmulatedPathToInternal(path);