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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.os;
import android.Manifest;
import android.annotation.NonNull;
import android.annotation.SuppressLint;
import android.annotation.SystemApi;
import android.annotation.TestApi;
import android.app.AppGlobals;
import android.app.AppOpsManager;
import android.app.admin.DevicePolicyManager;
import android.compat.Compatibility;
import android.compat.annotation.ChangeId;
import android.compat.annotation.Disabled;
import android.compat.annotation.UnsupportedAppUsage;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.os.storage.StorageManager;
import android.os.storage.StorageVolume;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.util.Log;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;
/**
* Provides access to environment variables.
*/
public class Environment {
private static final String TAG = "Environment";
// NOTE: keep credential-protected paths in sync with StrictMode.java
private static final String ENV_EXTERNAL_STORAGE = "EXTERNAL_STORAGE";
private static final String ENV_ANDROID_ROOT = "ANDROID_ROOT";
private static final String ENV_ANDROID_DATA = "ANDROID_DATA";
private static final String ENV_ANDROID_EXPAND = "ANDROID_EXPAND";
private static final String ENV_ANDROID_STORAGE = "ANDROID_STORAGE";
private static final String ENV_DOWNLOAD_CACHE = "DOWNLOAD_CACHE";
private static final String ENV_OEM_ROOT = "OEM_ROOT";
private static final String ENV_ODM_ROOT = "ODM_ROOT";
private static final String ENV_VENDOR_ROOT = "VENDOR_ROOT";
private static final String ENV_PRODUCT_ROOT = "PRODUCT_ROOT";
private static final String ENV_SYSTEM_EXT_ROOT = "SYSTEM_EXT_ROOT";
private static final String ENV_APEX_ROOT = "APEX_ROOT";
/** {@hide} */
public static final String DIR_ANDROID = "Android";
private static final String DIR_DATA = "data";
private static final String DIR_MEDIA = "media";
private static final String DIR_OBB = "obb";
private static final String DIR_FILES = "files";
private static final String DIR_CACHE = "cache";
/**
* The folder name prefix for the user credential protected data directory. This is exposed for
* use in string path caching for {@link ApplicationInfo} objects, and should not be accessed
* directly otherwise. Prefer {@link #getDataUserCeDirectory(String, int)}.
* {@hide}
*/
public static final String DIR_USER_CE = "user";
/**
* The folder name prefix for the user device protected data directory. This is exposed for use
* in string path caching for {@link ApplicationInfo} objects, and should not be accessed
* directly otherwise. Prefer {@link #getDataUserDeDirectory(String, int)}.
* {@hide}
*/
public static final String DIR_USER_DE = "user_de";
/** {@hide} */
@Deprecated
public static final String DIRECTORY_ANDROID = DIR_ANDROID;
private static final File DIR_ANDROID_ROOT = getDirectory(ENV_ANDROID_ROOT, "/system");
private static final String DIR_ANDROID_DATA_PATH = getDirectoryPath(ENV_ANDROID_DATA, "/data");
private static final File DIR_ANDROID_DATA = new File(DIR_ANDROID_DATA_PATH);
private static final File DIR_ANDROID_EXPAND = getDirectory(ENV_ANDROID_EXPAND, "/mnt/expand");
private static final File DIR_ANDROID_STORAGE = getDirectory(ENV_ANDROID_STORAGE, "/storage");
private static final File DIR_DOWNLOAD_CACHE = getDirectory(ENV_DOWNLOAD_CACHE, "/cache");
private static final File DIR_OEM_ROOT = getDirectory(ENV_OEM_ROOT, "/oem");
private static final File DIR_ODM_ROOT = getDirectory(ENV_ODM_ROOT, "/odm");
private static final File DIR_VENDOR_ROOT = getDirectory(ENV_VENDOR_ROOT, "/vendor");
private static final File DIR_PRODUCT_ROOT = getDirectory(ENV_PRODUCT_ROOT, "/product");
private static final File DIR_SYSTEM_EXT_ROOT = getDirectory(ENV_SYSTEM_EXT_ROOT,
"/system_ext");
private static final File DIR_APEX_ROOT = getDirectory(ENV_APEX_ROOT,
"/apex");
/**
* Scoped Storage is on by default. However, it is not strictly enforced and there are multiple
* ways to opt out of scoped storage:
*
* - Target Sdk < Q
* - Target Sdk = Q and has `requestLegacyExternalStorage` set in AndroidManifest.xml
* - Target Sdk > Q: Upgrading from an app that was opted out of scoped storage and has
* `preserveLegacyExternalStorage` set in AndroidManifest.xml
*
* This flag is enabled for all apps by default as Scoped Storage is enabled by default.
* Developers can disable this flag to opt out of Scoped Storage and have legacy storage
* workflow.
*
* Note: {@code FORCE_ENABLE_SCOPED_STORAGE} should also be disabled for apps to opt out of
* scoped storage.
* Note: This flag is also used in {@code com.android.providers.media.LocalCallingIdentity}.
* Any modifications to this flag should be reflected there as well.
* See https://developer.android.com/training/data-storage#scoped-storage for more information.
*/
@ChangeId
private static final long DEFAULT_SCOPED_STORAGE = 149924527L;
/**
* See definition in com.android.providers.media.LocalCallingIdentity
*/
/**
* Setting this flag strictly enforces Scoped Storage regardless of:
*
* - The value of Target Sdk
* - The value of `requestLegacyExternalStorage` in AndroidManifest.xml
* - The value of `preserveLegacyExternalStorage` in AndroidManifest.xml
*
*
* Note: {@code DEFAULT_SCOPED_STORAGE} should also be enabled for apps to be enforced into
* scoped storage.
* Note: This flag is also used in {@code com.android.providers.media.LocalCallingIdentity}.
* Any modifications to this flag should be reflected there as well.
* See https://developer.android.com/training/data-storage#scoped-storage for more information.
*/
@ChangeId
@Disabled
private static final long FORCE_ENABLE_SCOPED_STORAGE = 132649864L;
@UnsupportedAppUsage
private static UserEnvironment sCurrentUser;
private static boolean sUserRequired;
static {
initForCurrentUser();
}
/** {@hide} */
@UnsupportedAppUsage
public static void initForCurrentUser() {
final int userId = UserHandle.myUserId();
sCurrentUser = new UserEnvironment(userId);
}
/** {@hide} */
public static class UserEnvironment {
private final int mUserId;
@UnsupportedAppUsage
public UserEnvironment(int userId) {
mUserId = userId;
}
@UnsupportedAppUsage
public File[] getExternalDirs() {
final StorageVolume[] volumes = StorageManager.getVolumeList(mUserId,
StorageManager.FLAG_FOR_WRITE);
final File[] files = new File[volumes.length];
for (int i = 0; i < volumes.length; i++) {
files[i] = volumes[i].getPathFile();
}
return files;
}
@UnsupportedAppUsage
public File getExternalStorageDirectory() {
return getExternalDirs()[0];
}
@UnsupportedAppUsage
public File getExternalStoragePublicDirectory(String type) {
return buildExternalStoragePublicDirs(type)[0];
}
public File[] buildExternalStoragePublicDirs(String type) {
return buildPaths(getExternalDirs(), type);
}
public File[] buildExternalStorageAndroidDataDirs() {
return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA);
}
public File[] buildExternalStorageAndroidObbDirs() {
return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_OBB);
}
public File[] buildExternalStorageAppDataDirs(String packageName) {
return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA, packageName);
}
public File[] buildExternalStorageAppMediaDirs(String packageName) {
return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_MEDIA, packageName);
}
public File[] buildExternalStorageAppObbDirs(String packageName) {
return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_OBB, packageName);
}
public File[] buildExternalStorageAppFilesDirs(String packageName) {
return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA, packageName, DIR_FILES);
}
public File[] buildExternalStorageAppCacheDirs(String packageName) {
return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA, packageName, DIR_CACHE);
}
}
/**
* Return root of the "system" partition holding the core Android OS.
* Always present and mounted read-only.
*/
public static @NonNull File getRootDirectory() {
return DIR_ANDROID_ROOT;
}
/**
* Return root directory where all external storage devices will be mounted.
* For example, {@link #getExternalStorageDirectory()} will appear under
* this location.
*/
public static @NonNull File getStorageDirectory() {
return DIR_ANDROID_STORAGE;
}
/**
* Return root directory of the "oem" partition holding OEM customizations,
* if any. If present, the partition is mounted read-only.
*
* @hide
*/
@SystemApi
public static @NonNull File getOemDirectory() {
return DIR_OEM_ROOT;
}
/**
* Return root directory of the "odm" partition holding ODM customizations,
* if any. If present, the partition is mounted read-only.
*
* @hide
*/
@SystemApi
public static @NonNull File getOdmDirectory() {
return DIR_ODM_ROOT;
}
/**
* Return root directory of the "vendor" partition that holds vendor-provided
* software that should persist across simple reflashing of the "system" partition.
* @hide
*/
@SystemApi
public static @NonNull File getVendorDirectory() {
return DIR_VENDOR_ROOT;
}
/**
* Return root directory of the "product" partition holding product-specific
* customizations if any. If present, the partition is mounted read-only.
*
* @hide
*/
@SystemApi
public static @NonNull File getProductDirectory() {
return DIR_PRODUCT_ROOT;
}
/**
* Return root directory of the "product_services" partition holding middleware
* services if any. If present, the partition is mounted read-only.
*
* @deprecated This directory is not guaranteed to exist.
* Its name is changed to "system_ext" because the partition's purpose is changed.
* {@link #getSystemExtDirectory()}
* @hide
*/
@SystemApi
@Deprecated
public static @NonNull File getProductServicesDirectory() {
return getDirectory("PRODUCT_SERVICES_ROOT", "/product_services");
}
/**
* Return root directory of the "system_ext" partition holding system partition's extension
* If present, the partition is mounted read-only.
*
* @hide
*/
@SystemApi
public static @NonNull File getSystemExtDirectory() {
return DIR_SYSTEM_EXT_ROOT;
}
/**
* Return root directory of the apex mount point, where all the apex modules are made available
* to the rest of the system.
*
* @hide
*/
public static @NonNull File getApexDirectory() {
return DIR_APEX_ROOT;
}
/**
* Return the system directory for a user. This is for use by system
* services to store files relating to the user. This directory will be
* automatically deleted when the user is removed.
*
* @deprecated This directory is valid and still exists, but but callers
* should strongly consider switching to using either
* {@link #getDataSystemCeDirectory(int)} or
* {@link #getDataSystemDeDirectory(int)}, both of which support
* fast user wipe.
* @hide
*/
@Deprecated
public static File getUserSystemDirectory(int userId) {
return new File(new File(getDataSystemDirectory(), "users"), Integer.toString(userId));
}
/**
* Returns the config directory for a user. This is for use by system
* services to store files relating to the user which should be readable by
* any app running as that user.
*
* @deprecated This directory is valid and still exists, but callers should
* strongly consider switching to
* {@link #getDataMiscCeDirectory(int)} which is protected with
* user credentials or {@link #getDataMiscDeDirectory(int)}
* which supports fast user wipe.
* @hide
*/
@Deprecated
public static File getUserConfigDirectory(int userId) {
return new File(new File(new File(
getDataDirectory(), "misc"), "user"), Integer.toString(userId));
}
/**
* Return the user data directory.
*/
public static File getDataDirectory() {
return DIR_ANDROID_DATA;
}
/**
* @see #getDataDirectory()
* @hide
*/
public static String getDataDirectoryPath() {
return DIR_ANDROID_DATA_PATH;
}
/** {@hide} */
public static File getDataDirectory(String volumeUuid) {
if (TextUtils.isEmpty(volumeUuid)) {
return DIR_ANDROID_DATA;
} else {
return new File("/mnt/expand/" + volumeUuid);
}
}
/** @hide */
public static String getDataDirectoryPath(String volumeUuid) {
if (TextUtils.isEmpty(volumeUuid)) {
return DIR_ANDROID_DATA_PATH;
} else {
return getExpandDirectory().getAbsolutePath() + File.separator + volumeUuid;
}
}
/** {@hide} */
public static File getExpandDirectory() {
return DIR_ANDROID_EXPAND;
}
/** {@hide} */
@UnsupportedAppUsage
public static File getDataSystemDirectory() {
return new File(getDataDirectory(), "system");
}
/**
* Returns the base directory for per-user system directory, device encrypted.
* {@hide}
*/
public static File getDataSystemDeDirectory() {
return buildPath(getDataDirectory(), "system_de");
}
/**
* Returns the base directory for per-user system directory, credential encrypted.
* {@hide}
*/
public static File getDataSystemCeDirectory() {
return buildPath(getDataDirectory(), "system_ce");
}
/**
* Return the "credential encrypted" system directory for a user. This is
* for use by system services to store files relating to the user. This
* directory supports fast user wipe, and will be automatically deleted when
* the user is removed.
*
* Data stored under this path is "credential encrypted", which uses an
* encryption key that is entangled with user credentials, such as a PIN or
* password. The contents will only be available once the user has been
* unlocked, as reported by {@code SystemService.onUnlockUser()}.
*
* New code should strongly prefer storing sensitive data in these
* credential encrypted areas.
*
* @hide
*/
public static File getDataSystemCeDirectory(int userId) {
return buildPath(getDataDirectory(), "system_ce", String.valueOf(userId));
}
/**
* Return the "device encrypted" system directory for a user. This is for
* use by system services to store files relating to the user. This
* directory supports fast user wipe, and will be automatically deleted when
* the user is removed.
*
* Data stored under this path is "device encrypted", which uses an
* encryption key that is tied to the physical device. The contents will
* only be available once the device has finished a {@code dm-verity}
* protected boot.
*
* New code should strongly avoid storing sensitive data in these
* device encrypted areas.
*
* @hide
*/
public static File getDataSystemDeDirectory(int userId) {
return buildPath(getDataDirectory(), "system_de", String.valueOf(userId));
}
/** {@hide} */
public static File getDataMiscDirectory() {
return new File(getDataDirectory(), "misc");
}
/** {@hide} */
public static File getDataMiscCeDirectory() {
return buildPath(getDataDirectory(), "misc_ce");
}
/** {@hide} */
public static File getDataMiscCeDirectory(int userId) {
return buildPath(getDataDirectory(), "misc_ce", String.valueOf(userId));
}
/** {@hide} */
public static File getDataMiscDeDirectory(int userId) {
return buildPath(getDataDirectory(), "misc_de", String.valueOf(userId));
}
private static File getDataProfilesDeDirectory(int userId) {
return buildPath(getDataDirectory(), "misc", "profiles", "cur", String.valueOf(userId));
}
/** {@hide} */
public static File getDataVendorCeDirectory(int userId) {
return buildPath(getDataDirectory(), "vendor_ce", String.valueOf(userId));
}
/** {@hide} */
public static File getDataVendorDeDirectory(int userId) {
return buildPath(getDataDirectory(), "vendor_de", String.valueOf(userId));
}
/** {@hide} */
public static File getDataRefProfilesDePackageDirectory(String packageName) {
return buildPath(getDataDirectory(), "misc", "profiles", "ref", packageName);
}
/** {@hide} */
public static File getDataProfilesDePackageDirectory(int userId, String packageName) {
return buildPath(getDataProfilesDeDirectory(userId), packageName);
}
/** {@hide} */
public static File getDataAppDirectory(String volumeUuid) {
return new File(getDataDirectory(volumeUuid), "app");
}
/** {@hide} */
public static File getDataStagingDirectory(String volumeUuid) {
return new File(getDataDirectory(volumeUuid), "app-staging");
}
/** {@hide} */
public static File getDataUserCeDirectory(String volumeUuid) {
return new File(getDataDirectory(volumeUuid), DIR_USER_CE);
}
/** {@hide} */
public static File getDataUserCeDirectory(String volumeUuid, int userId) {
return new File(getDataUserCeDirectory(volumeUuid), String.valueOf(userId));
}
/** {@hide} */
public static File getDataUserCePackageDirectory(String volumeUuid, int userId,
String packageName) {
// TODO: keep consistent with installd
return new File(getDataUserCeDirectory(volumeUuid, userId), packageName);
}
/** {@hide} */
public static File getDataUserDeDirectory(String volumeUuid) {
return new File(getDataDirectory(volumeUuid), DIR_USER_DE);
}
/** {@hide} */
public static File getDataUserDeDirectory(String volumeUuid, int userId) {
return new File(getDataUserDeDirectory(volumeUuid), String.valueOf(userId));
}
/** {@hide} */
public static File getDataUserDePackageDirectory(String volumeUuid, int userId,
String packageName) {
// TODO: keep consistent with installd
return new File(getDataUserDeDirectory(volumeUuid, userId), packageName);
}
/**
* Return preloads directory.
*
This directory may contain pre-loaded content such as
* {@link #getDataPreloadsDemoDirectory() demo videos} and
* {@link #getDataPreloadsAppsDirectory() APK files} .
* {@hide}
*/
public static File getDataPreloadsDirectory() {
return new File(getDataDirectory(), "preloads");
}
/**
* @see #getDataPreloadsDirectory()
* {@hide}
*/
public static File getDataPreloadsDemoDirectory() {
return new File(getDataPreloadsDirectory(), "demo");
}
/**
* @see #getDataPreloadsDirectory()
* {@hide}
*/
public static File getDataPreloadsAppsDirectory() {
return new File(getDataPreloadsDirectory(), "apps");
}
/**
* @see #getDataPreloadsDirectory()
* {@hide}
*/
public static File getDataPreloadsMediaDirectory() {
return new File(getDataPreloadsDirectory(), "media");
}
/**
* Returns location of preloaded cache directory for package name
* @see #getDataPreloadsDirectory()
* {@hide}
*/
public static File getDataPreloadsFileCacheDirectory(String packageName) {
return new File(getDataPreloadsFileCacheDirectory(), packageName);
}
/**
* Returns location of preloaded cache directory.
* @see #getDataPreloadsDirectory()
* {@hide}
*/
public static File getDataPreloadsFileCacheDirectory() {
return new File(getDataPreloadsDirectory(), "file_cache");
}
/**
* Returns location of packages cache directory.
* {@hide}
*/
public static File getPackageCacheDirectory() {
return new File(getDataSystemDirectory(), "package_cache");
}
/**
* Return locations where media files (such as ringtones, notification
* sounds, or alarm sounds) may be located on internal storage. These are
* typically indexed under {@link MediaStore#VOLUME_INTERNAL}.
*
* @hide
*/
@SystemApi
public static @NonNull Collection getInternalMediaDirectories() {
final ArrayList res = new ArrayList<>();
addCanonicalFile(res, new File(Environment.getRootDirectory(), "media"));
addCanonicalFile(res, new File(Environment.getOemDirectory(), "media"));
addCanonicalFile(res, new File(Environment.getProductDirectory(), "media"));
return res;
}
private static void addCanonicalFile(List list, File file) {
try {
list.add(file.getCanonicalFile());
} catch (IOException e) {
Log.w(TAG, "Failed to resolve " + file + ": " + e);
list.add(file);
}
}
/**
* Return the primary shared/external storage directory. This directory may
* not currently be accessible if it has been mounted by the user on their
* computer, has been removed from the device, or some other problem has
* happened. You can determine its current state with
* {@link #getExternalStorageState()}.
*
* Note: don't be confused by the word "external" here. This directory
* can better be thought as media/shared storage. It is a filesystem that
* can hold a relatively large amount of data and that is shared across all
* applications (does not enforce permissions). Traditionally this is an SD
* card, but it may also be implemented as built-in storage in a device that
* is distinct from the protected internal storage and can be mounted as a
* filesystem on a computer.
*
* On devices with multiple users (as described by {@link UserManager}),
* each user has their own isolated shared storage. Applications only have
* access to the shared storage for the user they're running as.
*
* In devices with multiple shared/external storage directories, this
* directory represents the primary storage that the user will interact
* with. Access to secondary storage is available through
* {@link Context#getExternalFilesDirs(String)},
* {@link Context#getExternalCacheDirs()}, and
* {@link Context#getExternalMediaDirs()}.
*
* Applications should not directly use this top-level directory, in order
* to avoid polluting the user's root namespace. Any files that are private
* to the application should be placed in a directory returned by
* {@link android.content.Context#getExternalFilesDir
* Context.getExternalFilesDir}, which the system will take care of deleting
* if the application is uninstalled. Other shared files should be placed in
* one of the directories returned by
* {@link #getExternalStoragePublicDirectory}.
*
* Writing to this path requires the
* {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE} permission,
* and starting in {@link android.os.Build.VERSION_CODES#KITKAT}, read
* access requires the
* {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission,
* which is automatically granted if you hold the write permission.
*
* Starting in {@link android.os.Build.VERSION_CODES#KITKAT}, if your
* application only needs to store internal data, consider using
* {@link Context#getExternalFilesDir(String)},
* {@link Context#getExternalCacheDir()}, or
* {@link Context#getExternalMediaDirs()}, which require no permissions to
* read or write.
*
* This path may change between platform versions, so applications should
* only persist relative paths.
*
* Here is an example of typical code to monitor the state of external
* storage:
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.java
* monitor_storage}
*
* Note that alternatives such as {@link Context#getExternalFilesDir(String)} or
* {@link MediaStore} offer better performance.
*
* @see #getExternalStorageState()
* @see #isExternalStorageRemovable()
*/
public static File getExternalStorageDirectory() {
throwIfUserRequired();
return sCurrentUser.getExternalDirs()[0];
}
/** {@hide} */
@UnsupportedAppUsage
public static File getLegacyExternalStorageDirectory() {
return new File(System.getenv(ENV_EXTERNAL_STORAGE));
}
/** {@hide} */
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
public static File getLegacyExternalStorageObbDirectory() {
return buildPath(getLegacyExternalStorageDirectory(), DIR_ANDROID, DIR_OBB);
}
/**
* Standard directory in which to place any audio files that should be
* in the regular list of music for the user.
* This may be combined with {@link #DIRECTORY_AUDIOBOOKS},
* {@link #DIRECTORY_PODCASTS}, {@link #DIRECTORY_NOTIFICATIONS},
* {@link #DIRECTORY_ALARMS}, {@link #DIRECTORY_RINGTONES}, and
* {@link #DIRECTORY_RECORDINGS} as a series of directories to
* categorize a particular audio file as more than one type.
*/
public static String DIRECTORY_MUSIC = "Music";
/**
* Standard directory in which to place any audio files that should be
* in the list of podcasts that the user can select (not as regular
* music).
* This may be combined with {@link #DIRECTORY_MUSIC},
* {@link #DIRECTORY_AUDIOBOOKS}, {@link #DIRECTORY_NOTIFICATIONS},
* {@link #DIRECTORY_ALARMS}, {@link #DIRECTORY_RINGTONES}, and
* {@link #DIRECTORY_RECORDINGS} as a series of directories to
* categorize a particular audio file as more than one type.
*/
public static String DIRECTORY_PODCASTS = "Podcasts";
/**
* Standard directory in which to place any audio files that should be
* in the list of ringtones that the user can select (not as regular
* music).
* This may be combined with {@link #DIRECTORY_MUSIC},
* {@link #DIRECTORY_AUDIOBOOKS}, {@link #DIRECTORY_PODCASTS},
* {@link #DIRECTORY_NOTIFICATIONS}, {@link #DIRECTORY_ALARMS},
* and {@link #DIRECTORY_RECORDINGS} as a series of directories
* to categorize a particular audio file as more than one type.
*/
public static String DIRECTORY_RINGTONES = "Ringtones";
/**
* Standard directory in which to place any audio files that should be
* in the list of alarms that the user can select (not as regular
* music).
* This may be combined with {@link #DIRECTORY_MUSIC},
* {@link #DIRECTORY_AUDIOBOOKS}, {@link #DIRECTORY_PODCASTS},
* {@link #DIRECTORY_NOTIFICATIONS}, {@link #DIRECTORY_RINGTONES},
* and {@link #DIRECTORY_RECORDINGS} as a series of directories
* to categorize a particular audio file as more than one type.
*/
public static String DIRECTORY_ALARMS = "Alarms";
/**
* Standard directory in which to place any audio files that should be
* in the list of notifications that the user can select (not as regular
* music).
* This may be combined with {@link #DIRECTORY_MUSIC},
* {@link #DIRECTORY_AUDIOBOOKS}, {@link #DIRECTORY_PODCASTS},
* {@link #DIRECTORY_ALARMS}, {@link #DIRECTORY_RINGTONES}, and
* {@link #DIRECTORY_RECORDINGS} as a series of directories to
* categorize a particular audio file as more than one type.
*/
public static String DIRECTORY_NOTIFICATIONS = "Notifications";
/**
* Standard directory in which to place pictures that are available to
* the user. Note that this is primarily a convention for the top-level
* public directory, as the media scanner will find and collect pictures
* in any directory.
*/
public static String DIRECTORY_PICTURES = "Pictures";
/**
* Standard directory in which to place movies that are available to
* the user. Note that this is primarily a convention for the top-level
* public directory, as the media scanner will find and collect movies
* in any directory.
*/
public static String DIRECTORY_MOVIES = "Movies";
/**
* Standard directory in which to place files that have been downloaded by
* the user. Note that this is primarily a convention for the top-level
* public directory, you are free to download files anywhere in your own
* private directories. Also note that though the constant here is
* named DIRECTORY_DOWNLOADS (plural), the actual file name is non-plural for
* backwards compatibility reasons.
*/
public static String DIRECTORY_DOWNLOADS = "Download";
/**
* The traditional location for pictures and videos when mounting the
* device as a camera. Note that this is primarily a convention for the
* top-level public directory, as this convention makes no sense elsewhere.
*/
public static String DIRECTORY_DCIM = "DCIM";
/**
* Standard directory in which to place documents that have been created by
* the user.
*/
public static String DIRECTORY_DOCUMENTS = "Documents";
/**
* Standard directory in which to place screenshots that have been taken by
* the user. Typically used as a secondary directory under
* {@link #DIRECTORY_PICTURES}.
*/
public static String DIRECTORY_SCREENSHOTS = "Screenshots";
/**
* Standard directory in which to place any audio files that should be
* in the list of audiobooks that the user can select (not as regular
* music).
* This may be combined with {@link #DIRECTORY_MUSIC},
* {@link #DIRECTORY_PODCASTS}, {@link #DIRECTORY_NOTIFICATIONS},
* {@link #DIRECTORY_ALARMS}, {@link #DIRECTORY_RINGTONES},
* and {@link #DIRECTORY_RECORDINGS} as a series of directories
* to categorize a particular audio file as more than one type.
*/
public static String DIRECTORY_AUDIOBOOKS = "Audiobooks";
/**
* Standard directory in which to place any audio files that should be
* in the list of voice recordings recorded by voice recorder apps that
* the user can select (not as regular music).
* This may be combined with {@link #DIRECTORY_MUSIC},
* {@link #DIRECTORY_AUDIOBOOKS}, {@link #DIRECTORY_PODCASTS},
* {@link #DIRECTORY_NOTIFICATIONS}, {@link #DIRECTORY_ALARMS},
* and {@link #DIRECTORY_RINGTONES} as a series of directories
* to categorize a particular audio file as more than one type.
*/
@NonNull
// The better way is that expose a static method getRecordingDirectories.
// But since it's an existing API surface and developers already
// used to DIRECTORY_* constants, we should keep using this pattern
// for consistency. We use SuppressLint here to avoid exposing a final
// field. A final field will prevent us from ever changing the value of
// DIRECTORY_RECORDINGS. Not that it's likely that we will ever need to
// change it, but it's better to have such option.
@SuppressLint({"MutableBareField", "AllUpper"})
public static String DIRECTORY_RECORDINGS = "Recordings";
/**
* List of standard storage directories.
*
* Each of its values have its own constant:
*
* - {@link #DIRECTORY_MUSIC}
*
- {@link #DIRECTORY_PODCASTS}
*
- {@link #DIRECTORY_ALARMS}
*
- {@link #DIRECTORY_RINGTONES}
*
- {@link #DIRECTORY_NOTIFICATIONS}
*
- {@link #DIRECTORY_PICTURES}
*
- {@link #DIRECTORY_MOVIES}
*
- {@link #DIRECTORY_DOWNLOADS}
*
- {@link #DIRECTORY_DCIM}
*
- {@link #DIRECTORY_DOCUMENTS}
*
- {@link #DIRECTORY_AUDIOBOOKS}
*
- {@link #DIRECTORY_RECORDINGS}
*
* @hide
*/
public static final String[] STANDARD_DIRECTORIES = {
DIRECTORY_MUSIC,
DIRECTORY_PODCASTS,
DIRECTORY_RINGTONES,
DIRECTORY_ALARMS,
DIRECTORY_NOTIFICATIONS,
DIRECTORY_PICTURES,
DIRECTORY_MOVIES,
DIRECTORY_DOWNLOADS,
DIRECTORY_DCIM,
DIRECTORY_DOCUMENTS,
DIRECTORY_AUDIOBOOKS,
DIRECTORY_RECORDINGS,
};
/**
* @hide
*/
public static boolean isStandardDirectory(String dir) {
for (String valid : STANDARD_DIRECTORIES) {
if (valid.equals(dir)) {
return true;
}
}
return false;
}
/** {@hide} */ public static final int HAS_MUSIC = 1 << 0;
/** {@hide} */ public static final int HAS_PODCASTS = 1 << 1;
/** {@hide} */ public static final int HAS_RINGTONES = 1 << 2;
/** {@hide} */ public static final int HAS_ALARMS = 1 << 3;
/** {@hide} */ public static final int HAS_NOTIFICATIONS = 1 << 4;
/** {@hide} */ public static final int HAS_PICTURES = 1 << 5;
/** {@hide} */ public static final int HAS_MOVIES = 1 << 6;
/** {@hide} */ public static final int HAS_DOWNLOADS = 1 << 7;
/** {@hide} */ public static final int HAS_DCIM = 1 << 8;
/** {@hide} */ public static final int HAS_DOCUMENTS = 1 << 9;
/** {@hide} */ public static final int HAS_AUDIOBOOKS = 1 << 10;
/** {@hide} */ public static final int HAS_RECORDINGS = 1 << 11;
/** {@hide} */ public static final int HAS_ANDROID = 1 << 16;
/** {@hide} */ public static final int HAS_OTHER = 1 << 17;
/**
* Classify the content types present on the given external storage device.
*
* This is typically useful for deciding if an inserted SD card is empty, or
* if it contains content like photos that should be preserved.
*
* @hide
*/
public static int classifyExternalStorageDirectory(File dir) {
int res = 0;
for (File f : FileUtils.listFilesOrEmpty(dir)) {
if (f.isFile() && isInterestingFile(f)) {
res |= HAS_OTHER;
} else if (f.isDirectory() && hasInterestingFiles(f)) {
final String name = f.getName();
if (DIRECTORY_MUSIC.equals(name)) res |= HAS_MUSIC;
else if (DIRECTORY_PODCASTS.equals(name)) res |= HAS_PODCASTS;
else if (DIRECTORY_RINGTONES.equals(name)) res |= HAS_RINGTONES;
else if (DIRECTORY_ALARMS.equals(name)) res |= HAS_ALARMS;
else if (DIRECTORY_NOTIFICATIONS.equals(name)) res |= HAS_NOTIFICATIONS;
else if (DIRECTORY_PICTURES.equals(name)) res |= HAS_PICTURES;
else if (DIRECTORY_MOVIES.equals(name)) res |= HAS_MOVIES;
else if (DIRECTORY_DOWNLOADS.equals(name)) res |= HAS_DOWNLOADS;
else if (DIRECTORY_DCIM.equals(name)) res |= HAS_DCIM;
else if (DIRECTORY_DOCUMENTS.equals(name)) res |= HAS_DOCUMENTS;
else if (DIRECTORY_AUDIOBOOKS.equals(name)) res |= HAS_AUDIOBOOKS;
else if (DIRECTORY_RECORDINGS.equals(name)) res |= HAS_RECORDINGS;
else if (DIRECTORY_ANDROID.equals(name)) res |= HAS_ANDROID;
else res |= HAS_OTHER;
}
}
return res;
}
private static boolean hasInterestingFiles(File dir) {
final LinkedList explore = new LinkedList<>();
explore.add(dir);
while (!explore.isEmpty()) {
dir = explore.pop();
for (File f : FileUtils.listFilesOrEmpty(dir)) {
if (isInterestingFile(f)) return true;
if (f.isDirectory()) explore.add(f);
}
}
return false;
}
private static boolean isInterestingFile(File file) {
if (file.isFile()) {
final String name = file.getName().toLowerCase();
if (name.endsWith(".exe") || name.equals("autorun.inf")
|| name.equals("launchpad.zip") || name.equals(".nomedia")) {
return false;
} else {
return true;
}
} else {
return false;
}
}
/**
* Get a top-level shared/external storage directory for placing files of a
* particular type. This is where the user will typically place and manage
* their own files, so you should be careful about what you put here to
* ensure you don't erase their files or get in the way of their own
* organization.
*
* On devices with multiple users (as described by {@link UserManager}),
* each user has their own isolated shared storage. Applications only have
* access to the shared storage for the user they're running as.
*
*
* Here is an example of typical code to manipulate a picture on the public
* shared storage:
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.java
* public_picture}
*
* Note that alternatives such as {@link Context#getExternalFilesDir(String)} or
* {@link MediaStore} offer better performance.
*
* @param type The type of storage directory to return. Should be one of
* {@link #DIRECTORY_MUSIC}, {@link #DIRECTORY_PODCASTS},
* {@link #DIRECTORY_RINGTONES}, {@link #DIRECTORY_ALARMS},
* {@link #DIRECTORY_NOTIFICATIONS}, {@link #DIRECTORY_PICTURES},
* {@link #DIRECTORY_MOVIES}, {@link #DIRECTORY_DOWNLOADS},
* {@link #DIRECTORY_DCIM}, or {@link #DIRECTORY_DOCUMENTS}. May not be null.
* @return Returns the File path for the directory. Note that this directory
* may not yet exist, so you must make sure it exists before using
* it such as with {@link File#mkdirs File.mkdirs()}.
*/
public static File getExternalStoragePublicDirectory(String type) {
throwIfUserRequired();
return sCurrentUser.buildExternalStoragePublicDirs(type)[0];
}
/**
* Returns the path for android-specific data on the SD card.
* @hide
*/
@UnsupportedAppUsage
public static File[] buildExternalStorageAndroidDataDirs() {
throwIfUserRequired();
return sCurrentUser.buildExternalStorageAndroidDataDirs();
}
/**
* Returns the path for android-specific OBB data on the SD card.
* @hide
*/
public static File[] buildExternalStorageAndroidObbDirs() {
throwIfUserRequired();
return sCurrentUser.buildExternalStorageAndroidObbDirs();
}
/**
* Generates the raw path to an application's data
* @hide
*/
@UnsupportedAppUsage
public static File[] buildExternalStorageAppDataDirs(String packageName) {
throwIfUserRequired();
return sCurrentUser.buildExternalStorageAppDataDirs(packageName);
}
/**
* Generates the raw path to an application's media
* @hide
*/
@UnsupportedAppUsage
public static File[] buildExternalStorageAppMediaDirs(String packageName) {
throwIfUserRequired();
return sCurrentUser.buildExternalStorageAppMediaDirs(packageName);
}
/**
* Generates the raw path to an application's OBB files
* @hide
*/
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
public static File[] buildExternalStorageAppObbDirs(String packageName) {
throwIfUserRequired();
return sCurrentUser.buildExternalStorageAppObbDirs(packageName);
}
/**
* Generates the path to an application's files.
* @hide
*/
@UnsupportedAppUsage
public static File[] buildExternalStorageAppFilesDirs(String packageName) {
throwIfUserRequired();
return sCurrentUser.buildExternalStorageAppFilesDirs(packageName);
}
/**
* Generates the path to an application's cache.
* @hide
*/
@UnsupportedAppUsage
public static File[] buildExternalStorageAppCacheDirs(String packageName) {
throwIfUserRequired();
return sCurrentUser.buildExternalStorageAppCacheDirs(packageName);
}
/** @hide */
public static File[] buildExternalStoragePublicDirs(@NonNull String dirType) {
throwIfUserRequired();
return sCurrentUser.buildExternalStoragePublicDirs(dirType);
}
/**
* Return the download/cache content directory.
*/
public static File getDownloadCacheDirectory() {
return DIR_DOWNLOAD_CACHE;
}
/**
* Unknown storage state, such as when a path isn't backed by known storage
* media.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_UNKNOWN = "unknown";
/**
* Storage state if the media is not present.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_REMOVED = "removed";
/**
* Storage state if the media is present but not mounted.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_UNMOUNTED = "unmounted";
/**
* Storage state if the media is present and being disk-checked.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_CHECKING = "checking";
/**
* Storage state if the media is present but is blank or is using an
* unsupported filesystem.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_NOFS = "nofs";
/**
* Storage state if the media is present and mounted at its mount point with
* read/write access.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_MOUNTED = "mounted";
/**
* Storage state if the media is present and mounted at its mount point with
* read-only access.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_MOUNTED_READ_ONLY = "mounted_ro";
/**
* Storage state if the media is present not mounted, and shared via USB
* mass storage.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_SHARED = "shared";
/**
* Storage state if the media was removed before it was unmounted.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_BAD_REMOVAL = "bad_removal";
/**
* Storage state if the media is present but cannot be mounted. Typically
* this happens if the file system on the media is corrupted.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_UNMOUNTABLE = "unmountable";
/**
* Storage state if the media is in the process of being ejected.
*
* @see #getExternalStorageState(File)
*/
public static final String MEDIA_EJECTING = "ejecting";
/**
* Returns the current state of the primary shared/external storage media.
*
* @see #getExternalStorageDirectory()
* @return one of {@link #MEDIA_UNKNOWN}, {@link #MEDIA_REMOVED},
* {@link #MEDIA_UNMOUNTED}, {@link #MEDIA_CHECKING},
* {@link #MEDIA_NOFS}, {@link #MEDIA_MOUNTED},
* {@link #MEDIA_MOUNTED_READ_ONLY}, {@link #MEDIA_SHARED},
* {@link #MEDIA_BAD_REMOVAL}, or {@link #MEDIA_UNMOUNTABLE}.
*/
public static String getExternalStorageState() {
final File externalDir = sCurrentUser.getExternalDirs()[0];
return getExternalStorageState(externalDir);
}
/**
* @deprecated use {@link #getExternalStorageState(File)}
*/
@Deprecated
public static String getStorageState(File path) {
return getExternalStorageState(path);
}
/**
* Returns the current state of the shared/external storage media at the
* given path.
*
* @return one of {@link #MEDIA_UNKNOWN}, {@link #MEDIA_REMOVED},
* {@link #MEDIA_UNMOUNTED}, {@link #MEDIA_CHECKING},
* {@link #MEDIA_NOFS}, {@link #MEDIA_MOUNTED},
* {@link #MEDIA_MOUNTED_READ_ONLY}, {@link #MEDIA_SHARED},
* {@link #MEDIA_BAD_REMOVAL}, or {@link #MEDIA_UNMOUNTABLE}.
*/
public static String getExternalStorageState(File path) {
final StorageVolume volume = StorageManager.getStorageVolume(path, UserHandle.myUserId());
if (volume != null) {
return volume.getState();
} else {
return MEDIA_UNKNOWN;
}
}
/**
* Returns whether the primary shared/external storage media is physically
* removable.
*
* @return true if the storage device can be removed (such as an SD card),
* or false if the storage device is built in and cannot be
* physically removed.
*/
public static boolean isExternalStorageRemovable() {
final File externalDir = sCurrentUser.getExternalDirs()[0];
return isExternalStorageRemovable(externalDir);
}
/**
* Returns whether the shared/external storage media at the given path is
* physically removable.
*
* @return true if the storage device can be removed (such as an SD card),
* or false if the storage device is built in and cannot be
* physically removed.
* @throws IllegalArgumentException if the path is not a valid storage
* device.
*/
public static boolean isExternalStorageRemovable(@NonNull File path) {
final StorageVolume volume = StorageManager.getStorageVolume(path, UserHandle.myUserId());
if (volume != null) {
return volume.isRemovable();
} else {
throw new IllegalArgumentException("Failed to find storage device at " + path);
}
}
/**
* Returns whether the primary shared/external storage media is emulated.
*
* The contents of emulated storage devices are backed by a private user
* data partition, which means there is little benefit to apps storing data
* here instead of the private directories returned by
* {@link Context#getFilesDir()}, etc.
*
* This returns true when emulated storage is backed by either internal
* storage or an adopted storage device.
*
* @see DevicePolicyManager#setStorageEncryption(android.content.ComponentName,
* boolean)
*/
public static boolean isExternalStorageEmulated() {
final File externalDir = sCurrentUser.getExternalDirs()[0];
return isExternalStorageEmulated(externalDir);
}
/**
* Returns whether the shared/external storage media at the given path is
* emulated.
*
* The contents of emulated storage devices are backed by a private user
* data partition, which means there is little benefit to apps storing data
* here instead of the private directories returned by
* {@link Context#getFilesDir()}, etc.
*
* This returns true when emulated storage is backed by either internal
* storage or an adopted storage device.
*
* @throws IllegalArgumentException if the path is not a valid storage
* device.
*/
public static boolean isExternalStorageEmulated(@NonNull File path) {
final StorageVolume volume = StorageManager.getStorageVolume(path, UserHandle.myUserId());
if (volume != null) {
return volume.isEmulated();
} else {
throw new IllegalArgumentException("Failed to find storage device at " + path);
}
}
/**
* Returns whether the shared/external storage media is a
* legacy view that includes files not owned by the app.
*
* This value may be different from the value requested by
* {@code requestLegacyExternalStorage} in the app's manifest, since an app
* may inherit its legacy state based on when it was first installed, target sdk and other
* factors.
*
* Non-legacy apps can continue to discover and read media belonging to
* other apps via {@link android.provider.MediaStore}.
*/
public static boolean isExternalStorageLegacy() {
final File externalDir = sCurrentUser.getExternalDirs()[0];
return isExternalStorageLegacy(externalDir);
}
/**
* Returns whether the shared/external storage media is a
* legacy view that includes files not owned by the app.
*
* This value may be different from the value requested by
* {@code requestLegacyExternalStorage} in the app's manifest, since an app
* may inherit its legacy state based on when it was first installed, target sdk and other
* factors.
*
* Non-legacy apps can continue to discover and read media belonging to
* other apps via {@link android.provider.MediaStore}.
*
* @throws IllegalArgumentException if the path is not a valid storage
* device.
*/
public static boolean isExternalStorageLegacy(@NonNull File path) {
final Context context = AppGlobals.getInitialApplication();
final int uid = context.getApplicationInfo().uid;
// Isolated processes and Instant apps are never allowed to be in scoped storage
if (Process.isIsolated(uid)) {
return false;
}
final PackageManager packageManager = context.getPackageManager();
if (packageManager.isInstantApp()) {
return false;
}
boolean defaultScopedStorage = Compatibility.isChangeEnabled(DEFAULT_SCOPED_STORAGE);
boolean forceEnableScopedStorage = Compatibility.isChangeEnabled(
FORCE_ENABLE_SCOPED_STORAGE);
// if Scoped Storage is strictly enforced, the app does *not* have legacy storage access
// Note: does not require packagename/uid as this is directly called from an app process
if (isScopedStorageEnforced(defaultScopedStorage, forceEnableScopedStorage)) {
return false;
}
// if Scoped Storage is strictly disabled, the app has legacy storage access
// Note: does not require packagename/uid as this is directly called from an app process
if (isScopedStorageDisabled(defaultScopedStorage, forceEnableScopedStorage)) {
return true;
}
final AppOpsManager appOps = context.getSystemService(AppOpsManager.class);
final String opPackageName = context.getOpPackageName();
if (appOps.noteOpNoThrow(AppOpsManager.OP_LEGACY_STORAGE, uid,
opPackageName) == AppOpsManager.MODE_ALLOWED) {
return true;
}
// Legacy external storage access is granted to instrumentations invoked with
// "--no-isolated-storage" flag.
return appOps.noteOpNoThrow(AppOpsManager.OP_NO_ISOLATED_STORAGE, uid,
opPackageName) == AppOpsManager.MODE_ALLOWED;
}
private static boolean isScopedStorageEnforced(boolean defaultScopedStorage,
boolean forceEnableScopedStorage) {
return defaultScopedStorage && forceEnableScopedStorage;
}
private static boolean isScopedStorageDisabled(boolean defaultScopedStorage,
boolean forceEnableScopedStorage) {
return !defaultScopedStorage && !forceEnableScopedStorage;
}
/**
* Returns whether the calling app has All Files Access on the primary shared/external storage
* media.
*
Declaring the permission {@link android.Manifest.permission#MANAGE_EXTERNAL_STORAGE} isn't
* enough to gain the access.
*
To request access, use
* {@link android.provider.Settings#ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION}.
*/
public static boolean isExternalStorageManager() {
final File externalDir = sCurrentUser.getExternalDirs()[0];
return isExternalStorageManager(externalDir);
}
/**
* Returns whether the calling app has All Files Access at the given {@code path}
*
Declaring the permission {@link android.Manifest.permission#MANAGE_EXTERNAL_STORAGE} isn't
* enough to gain the access.
*
To request access, use
* {@link android.provider.Settings#ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION}.
*/
public static boolean isExternalStorageManager(@NonNull File path) {
final Context context = Objects.requireNonNull(AppGlobals.getInitialApplication());
String packageName = Objects.requireNonNull(context.getPackageName());
int uid = context.getApplicationInfo().uid;
final AppOpsManager appOps = context.getSystemService(AppOpsManager.class);
final int opMode =
appOps.checkOpNoThrow(AppOpsManager.OP_MANAGE_EXTERNAL_STORAGE, uid, packageName);
switch (opMode) {
case AppOpsManager.MODE_DEFAULT:
return PackageManager.PERMISSION_GRANTED
== context.checkPermission(
Manifest.permission.MANAGE_EXTERNAL_STORAGE, Process.myPid(), uid);
case AppOpsManager.MODE_ALLOWED:
return true;
case AppOpsManager.MODE_ERRORED:
case AppOpsManager.MODE_IGNORED:
return false;
default:
throw new IllegalStateException("Unknown AppOpsManager mode " + opMode);
}
}
static File getDirectory(String variableName, String defaultPath) {
String path = System.getenv(variableName);
return path == null ? new File(defaultPath) : new File(path);
}
@NonNull
static String getDirectoryPath(@NonNull String variableName, @NonNull String defaultPath) {
String path = System.getenv(variableName);
return path == null ? defaultPath : path;
}
/** {@hide} */
public static void setUserRequired(boolean userRequired) {
sUserRequired = userRequired;
}
private static void throwIfUserRequired() {
if (sUserRequired) {
Log.wtf(TAG, "Path requests must specify a user by using UserEnvironment",
new Throwable());
}
}
/**
* Append path segments to each given base path, returning result.
*
* @hide
*/
@UnsupportedAppUsage
public static File[] buildPaths(File[] base, String... segments) {
File[] result = new File[base.length];
for (int i = 0; i < base.length; i++) {
result[i] = buildPath(base[i], segments);
}
return result;
}
/**
* Append path segments to given base path, returning result.
*
* @hide
*/
@TestApi
public static File buildPath(File base, String... segments) {
File cur = base;
for (String segment : segments) {
if (cur == null) {
cur = new File(segment);
} else {
cur = new File(cur, segment);
}
}
return cur;
}
/**
* If the given path exists on emulated external storage, return the
* translated backing path hosted on internal storage. This bypasses any
* emulation later, improving performance. This is only suitable
* for read-only access.
*
* Returns original path if given path doesn't meet these criteria. Callers
* must hold {@link android.Manifest.permission#WRITE_MEDIA_STORAGE}
* permission.
*
* @deprecated disabled now that FUSE has been replaced by sdcardfs
* @hide
*/
@UnsupportedAppUsage
@Deprecated
public static File maybeTranslateEmulatedPathToInternal(File path) {
return StorageManager.maybeTranslateEmulatedPathToInternal(path);
}
}