Environment.java revision bdc9d58d06ce9ffd836eb299d38f1d594da36ad6
1/* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 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 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 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. 15 */ 16 17package android.os; 18 19import android.app.admin.DevicePolicyManager; 20import android.content.Context; 21import android.os.storage.StorageManager; 22import android.os.storage.StorageVolume; 23import android.text.TextUtils; 24import android.util.Log; 25 26import java.io.File; 27 28/** 29 * Provides access to environment variables. 30 */ 31public class Environment { 32 private static final String TAG = "Environment"; 33 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_STORAGE = "ANDROID_STORAGE"; 38 private static final String ENV_DOWNLOAD_CACHE = "DOWNLOAD_CACHE"; 39 private static final String ENV_OEM_ROOT = "OEM_ROOT"; 40 private static final String ENV_ODM_ROOT = "ODM_ROOT"; 41 private static final String ENV_VENDOR_ROOT = "VENDOR_ROOT"; 42 43 /** {@hide} */ 44 public static final String DIR_ANDROID = "Android"; 45 private static final String DIR_DATA = "data"; 46 private static final String DIR_MEDIA = "media"; 47 private static final String DIR_OBB = "obb"; 48 private static final String DIR_FILES = "files"; 49 private static final String DIR_CACHE = "cache"; 50 51 /** {@hide} */ 52 @Deprecated 53 public static final String DIRECTORY_ANDROID = DIR_ANDROID; 54 55 private static final File DIR_ANDROID_ROOT = getDirectory(ENV_ANDROID_ROOT, "/system"); 56 private static final File DIR_ANDROID_DATA = getDirectory(ENV_ANDROID_DATA, "/data"); 57 private static final File DIR_ANDROID_STORAGE = getDirectory(ENV_ANDROID_STORAGE, "/storage"); 58 private static final File DIR_DOWNLOAD_CACHE = getDirectory(ENV_DOWNLOAD_CACHE, "/cache"); 59 private static final File DIR_OEM_ROOT = getDirectory(ENV_OEM_ROOT, "/oem"); 60 private static final File DIR_ODM_ROOT = getDirectory(ENV_ODM_ROOT, "/odm"); 61 private static final File DIR_VENDOR_ROOT = getDirectory(ENV_VENDOR_ROOT, "/vendor"); 62 63 private static UserEnvironment sCurrentUser; 64 private static boolean sUserRequired; 65 66 static { 67 initForCurrentUser(); 68 } 69 70 /** {@hide} */ 71 public static void initForCurrentUser() { 72 final int userId = UserHandle.myUserId(); 73 sCurrentUser = new UserEnvironment(userId); 74 } 75 76 /** {@hide} */ 77 public static class UserEnvironment { 78 private final int mUserId; 79 80 public UserEnvironment(int userId) { 81 mUserId = userId; 82 } 83 84 public File[] getExternalDirs() { 85 final StorageVolume[] volumes = StorageManager.getVolumeList(mUserId, 86 StorageManager.FLAG_FOR_WRITE); 87 final File[] files = new File[volumes.length]; 88 for (int i = 0; i < volumes.length; i++) { 89 files[i] = volumes[i].getPathFile(); 90 } 91 return files; 92 } 93 94 @Deprecated 95 public File getExternalStorageDirectory() { 96 return getExternalDirs()[0]; 97 } 98 99 @Deprecated 100 public File getExternalStoragePublicDirectory(String type) { 101 return buildExternalStoragePublicDirs(type)[0]; 102 } 103 104 public File[] buildExternalStoragePublicDirs(String type) { 105 return buildPaths(getExternalDirs(), type); 106 } 107 108 public File[] buildExternalStorageAndroidDataDirs() { 109 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA); 110 } 111 112 public File[] buildExternalStorageAndroidObbDirs() { 113 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_OBB); 114 } 115 116 public File[] buildExternalStorageAppDataDirs(String packageName) { 117 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA, packageName); 118 } 119 120 public File[] buildExternalStorageAppMediaDirs(String packageName) { 121 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_MEDIA, packageName); 122 } 123 124 public File[] buildExternalStorageAppObbDirs(String packageName) { 125 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_OBB, packageName); 126 } 127 128 public File[] buildExternalStorageAppFilesDirs(String packageName) { 129 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA, packageName, DIR_FILES); 130 } 131 132 public File[] buildExternalStorageAppCacheDirs(String packageName) { 133 return buildPaths(getExternalDirs(), DIR_ANDROID, DIR_DATA, packageName, DIR_CACHE); 134 } 135 } 136 137 /** 138 * Return root of the "system" partition holding the core Android OS. 139 * Always present and mounted read-only. 140 */ 141 public static File getRootDirectory() { 142 return DIR_ANDROID_ROOT; 143 } 144 145 /** {@hide} */ 146 public static File getStorageDirectory() { 147 return DIR_ANDROID_STORAGE; 148 } 149 150 /** 151 * Return root directory of the "oem" partition holding OEM customizations, 152 * if any. If present, the partition is mounted read-only. 153 * 154 * @hide 155 */ 156 public static File getOemDirectory() { 157 return DIR_OEM_ROOT; 158 } 159 160 /** 161 * Return root directory of the "odm" partition holding ODM customizations, 162 * if any. If present, the partition is mounted read-only. 163 * 164 * @hide 165 */ 166 public static File getOdmDirectory() { 167 return DIR_ODM_ROOT; 168 } 169 170 /** 171 * Return root directory of the "vendor" partition that holds vendor-provided 172 * software that should persist across simple reflashing of the "system" partition. 173 * @hide 174 */ 175 public static File getVendorDirectory() { 176 return DIR_VENDOR_ROOT; 177 } 178 179 /** {@hide} */ 180 @Deprecated 181 public static File getSystemSecureDirectory() { 182 return getDataSystemDirectory(); 183 } 184 185 /** {@hide} */ 186 @Deprecated 187 public static File getSecureDataDirectory() { 188 return getDataDirectory(); 189 } 190 191 /** 192 * Return the system directory for a user. This is for use by system services to store 193 * files relating to the user. This directory will be automatically deleted when the user 194 * is removed. 195 * 196 * @hide 197 */ 198 public static File getUserSystemDirectory(int userId) { 199 return new File(new File(getDataSystemDirectory(), "users"), Integer.toString(userId)); 200 } 201 202 /** 203 * Returns the config directory for a user. This is for use by system services to store files 204 * relating to the user which should be readable by any app running as that user. 205 * 206 * @hide 207 */ 208 public static File getUserConfigDirectory(int userId) { 209 return new File(new File(new File( 210 getDataDirectory(), "misc"), "user"), Integer.toString(userId)); 211 } 212 213 /** 214 * Return the user data directory. 215 */ 216 public static File getDataDirectory() { 217 return DIR_ANDROID_DATA; 218 } 219 220 /** {@hide} */ 221 public static File getDataDirectory(String volumeUuid) { 222 if (TextUtils.isEmpty(volumeUuid)) { 223 return DIR_ANDROID_DATA; 224 } else { 225 return new File("/mnt/expand/" + volumeUuid); 226 } 227 } 228 229 /** {@hide} */ 230 public static File getDataSystemDirectory() { 231 return new File(getDataDirectory(), "system"); 232 } 233 234 /** {@hide} */ 235 public static File getDataSystemCredentialEncryptedDirectory() { 236 return new File(getDataDirectory(), "system_ce"); 237 } 238 239 /** {@hide} */ 240 public static File getDataSystemCredentialEncryptedDirectory(int userId) { 241 return new File(getDataSystemCredentialEncryptedDirectory(), String.valueOf(userId)); 242 } 243 244 /** {@hide} */ 245 public static File getDataAppDirectory(String volumeUuid) { 246 return new File(getDataDirectory(volumeUuid), "app"); 247 } 248 249 /** {@hide} */ 250 public static File getDataAppEphemeralDirectory(String volumeUuid) { 251 return new File(getDataDirectory(volumeUuid), "app-ephemeral"); 252 } 253 254 /** {@hide} */ 255 @Deprecated 256 public static File getDataUserDirectory(String volumeUuid) { 257 return getDataUserCredentialEncryptedDirectory(volumeUuid); 258 } 259 260 /** {@hide} */ 261 @Deprecated 262 public static File getDataUserDirectory(String volumeUuid, int userId) { 263 return getDataUserCredentialEncryptedDirectory(volumeUuid, userId); 264 } 265 266 /** {@hide} */ 267 @Deprecated 268 public static File getDataUserPackageDirectory(String volumeUuid, int userId, 269 String packageName) { 270 return getDataUserCredentialEncryptedPackageDirectory(volumeUuid, userId, packageName); 271 } 272 273 /** {@hide} */ 274 public static File getDataUserCredentialEncryptedDirectory(String volumeUuid) { 275 return new File(getDataDirectory(volumeUuid), "user"); 276 } 277 278 /** {@hide} */ 279 public static File getDataUserCredentialEncryptedDirectory(String volumeUuid, int userId) { 280 return new File(getDataUserCredentialEncryptedDirectory(volumeUuid), 281 String.valueOf(userId)); 282 } 283 284 /** {@hide} */ 285 public static File getDataUserCredentialEncryptedPackageDirectory(String volumeUuid, int userId, 286 String packageName) { 287 // TODO: keep consistent with installd 288 return new File(getDataUserCredentialEncryptedDirectory(volumeUuid, userId), packageName); 289 } 290 291 /** {@hide} */ 292 public static File getDataUserDeviceEncryptedDirectory(String volumeUuid) { 293 return new File(getDataDirectory(volumeUuid), "user_de"); 294 } 295 296 /** {@hide} */ 297 public static File getDataUserDeviceEncryptedDirectory(String volumeUuid, int userId) { 298 return new File(getDataUserDeviceEncryptedDirectory(volumeUuid), String.valueOf(userId)); 299 } 300 301 /** {@hide} */ 302 public static File getDataUserDeviceEncryptedPackageDirectory(String volumeUuid, int userId, 303 String packageName) { 304 // TODO: keep consistent with installd 305 return new File(getDataUserDeviceEncryptedDirectory(volumeUuid, userId), packageName); 306 } 307 308 /** 309 * Return the primary shared/external storage directory. This directory may 310 * not currently be accessible if it has been mounted by the user on their 311 * computer, has been removed from the device, or some other problem has 312 * happened. You can determine its current state with 313 * {@link #getExternalStorageState()}. 314 * <p> 315 * <em>Note: don't be confused by the word "external" here. This directory 316 * can better be thought as media/shared storage. It is a filesystem that 317 * can hold a relatively large amount of data and that is shared across all 318 * applications (does not enforce permissions). Traditionally this is an SD 319 * card, but it may also be implemented as built-in storage in a device that 320 * is distinct from the protected internal storage and can be mounted as a 321 * filesystem on a computer.</em> 322 * <p> 323 * On devices with multiple users (as described by {@link UserManager}), 324 * each user has their own isolated shared storage. Applications only have 325 * access to the shared storage for the user they're running as. 326 * <p> 327 * In devices with multiple shared/external storage directories, this 328 * directory represents the primary storage that the user will interact 329 * with. Access to secondary storage is available through 330 * {@link Context#getExternalFilesDirs(String)}, 331 * {@link Context#getExternalCacheDirs()}, and 332 * {@link Context#getExternalMediaDirs()}. 333 * <p> 334 * Applications should not directly use this top-level directory, in order 335 * to avoid polluting the user's root namespace. Any files that are private 336 * to the application should be placed in a directory returned by 337 * {@link android.content.Context#getExternalFilesDir 338 * Context.getExternalFilesDir}, which the system will take care of deleting 339 * if the application is uninstalled. Other shared files should be placed in 340 * one of the directories returned by 341 * {@link #getExternalStoragePublicDirectory}. 342 * <p> 343 * Writing to this path requires the 344 * {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE} permission, 345 * and starting in read access requires the 346 * {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission, 347 * which is automatically granted if you hold the write permission. 348 * <p> 349 * Starting in {@link android.os.Build.VERSION_CODES#KITKAT}, if your 350 * application only needs to store internal data, consider using 351 * {@link Context#getExternalFilesDir(String)}, 352 * {@link Context#getExternalCacheDir()}, or 353 * {@link Context#getExternalMediaDirs()}, which require no permissions to 354 * read or write. 355 * <p> 356 * This path may change between platform versions, so applications should 357 * only persist relative paths. 358 * <p> 359 * Here is an example of typical code to monitor the state of external 360 * storage: 361 * <p> 362 * {@sample development/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.java 363 * monitor_storage} 364 * 365 * @see #getExternalStorageState() 366 * @see #isExternalStorageRemovable() 367 */ 368 public static File getExternalStorageDirectory() { 369 throwIfUserRequired(); 370 return sCurrentUser.getExternalDirs()[0]; 371 } 372 373 /** {@hide} */ 374 public static File getLegacyExternalStorageDirectory() { 375 return new File(System.getenv(ENV_EXTERNAL_STORAGE)); 376 } 377 378 /** {@hide} */ 379 public static File getLegacyExternalStorageObbDirectory() { 380 return buildPath(getLegacyExternalStorageDirectory(), DIR_ANDROID, DIR_OBB); 381 } 382 383 /** 384 * Standard directory in which to place any audio files that should be 385 * in the regular list of music for the user. 386 * This may be combined with 387 * {@link #DIRECTORY_PODCASTS}, {@link #DIRECTORY_NOTIFICATIONS}, 388 * {@link #DIRECTORY_ALARMS}, and {@link #DIRECTORY_RINGTONES} as a series 389 * of directories to categories a particular audio file as more than one 390 * type. 391 */ 392 public static String DIRECTORY_MUSIC = "Music"; 393 394 /** 395 * Standard directory in which to place any audio files that should be 396 * in the list of podcasts that the user can select (not as regular 397 * music). 398 * This may be combined with {@link #DIRECTORY_MUSIC}, 399 * {@link #DIRECTORY_NOTIFICATIONS}, 400 * {@link #DIRECTORY_ALARMS}, and {@link #DIRECTORY_RINGTONES} as a series 401 * of directories to categories a particular audio file as more than one 402 * type. 403 */ 404 public static String DIRECTORY_PODCASTS = "Podcasts"; 405 406 /** 407 * Standard directory in which to place any audio files that should be 408 * in the list of ringtones that the user can select (not as regular 409 * music). 410 * This may be combined with {@link #DIRECTORY_MUSIC}, 411 * {@link #DIRECTORY_PODCASTS}, {@link #DIRECTORY_NOTIFICATIONS}, and 412 * {@link #DIRECTORY_ALARMS} as a series 413 * of directories to categories a particular audio file as more than one 414 * type. 415 */ 416 public static String DIRECTORY_RINGTONES = "Ringtones"; 417 418 /** 419 * Standard directory in which to place any audio files that should be 420 * in the list of alarms that the user can select (not as regular 421 * music). 422 * This may be combined with {@link #DIRECTORY_MUSIC}, 423 * {@link #DIRECTORY_PODCASTS}, {@link #DIRECTORY_NOTIFICATIONS}, 424 * and {@link #DIRECTORY_RINGTONES} as a series 425 * of directories to categories a particular audio file as more than one 426 * type. 427 */ 428 public static String DIRECTORY_ALARMS = "Alarms"; 429 430 /** 431 * Standard directory in which to place any audio files that should be 432 * in the list of notifications that the user can select (not as regular 433 * music). 434 * This may be combined with {@link #DIRECTORY_MUSIC}, 435 * {@link #DIRECTORY_PODCASTS}, 436 * {@link #DIRECTORY_ALARMS}, and {@link #DIRECTORY_RINGTONES} as a series 437 * of directories to categories a particular audio file as more than one 438 * type. 439 */ 440 public static String DIRECTORY_NOTIFICATIONS = "Notifications"; 441 442 /** 443 * Standard directory in which to place pictures that are available to 444 * the user. Note that this is primarily a convention for the top-level 445 * public directory, as the media scanner will find and collect pictures 446 * in any directory. 447 */ 448 public static String DIRECTORY_PICTURES = "Pictures"; 449 450 /** 451 * Standard directory in which to place movies that are available to 452 * the user. Note that this is primarily a convention for the top-level 453 * public directory, as the media scanner will find and collect movies 454 * in any directory. 455 */ 456 public static String DIRECTORY_MOVIES = "Movies"; 457 458 /** 459 * Standard directory in which to place files that have been downloaded by 460 * the user. Note that this is primarily a convention for the top-level 461 * public directory, you are free to download files anywhere in your own 462 * private directories. Also note that though the constant here is 463 * named DIRECTORY_DOWNLOADS (plural), the actual file name is non-plural for 464 * backwards compatibility reasons. 465 */ 466 public static String DIRECTORY_DOWNLOADS = "Download"; 467 468 /** 469 * The traditional location for pictures and videos when mounting the 470 * device as a camera. Note that this is primarily a convention for the 471 * top-level public directory, as this convention makes no sense elsewhere. 472 */ 473 public static String DIRECTORY_DCIM = "DCIM"; 474 475 /** 476 * Standard directory in which to place documents that have been created by 477 * the user. 478 */ 479 public static String DIRECTORY_DOCUMENTS = "Documents"; 480 481 /** 482 * Get a top-level shared/external storage directory for placing files of a 483 * particular type. This is where the user will typically place and manage 484 * their own files, so you should be careful about what you put here to 485 * ensure you don't erase their files or get in the way of their own 486 * organization. 487 * <p> 488 * On devices with multiple users (as described by {@link UserManager}), 489 * each user has their own isolated shared storage. Applications only have 490 * access to the shared storage for the user they're running as. 491 * </p> 492 * <p> 493 * Here is an example of typical code to manipulate a picture on the public 494 * shared storage: 495 * </p> 496 * {@sample development/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.java 497 * public_picture} 498 * 499 * @param type The type of storage directory to return. Should be one of 500 * {@link #DIRECTORY_MUSIC}, {@link #DIRECTORY_PODCASTS}, 501 * {@link #DIRECTORY_RINGTONES}, {@link #DIRECTORY_ALARMS}, 502 * {@link #DIRECTORY_NOTIFICATIONS}, {@link #DIRECTORY_PICTURES}, 503 * {@link #DIRECTORY_MOVIES}, {@link #DIRECTORY_DOWNLOADS}, or 504 * {@link #DIRECTORY_DCIM}. May not be null. 505 * @return Returns the File path for the directory. Note that this directory 506 * may not yet exist, so you must make sure it exists before using 507 * it such as with {@link File#mkdirs File.mkdirs()}. 508 */ 509 public static File getExternalStoragePublicDirectory(String type) { 510 throwIfUserRequired(); 511 return sCurrentUser.buildExternalStoragePublicDirs(type)[0]; 512 } 513 514 /** 515 * Returns the path for android-specific data on the SD card. 516 * @hide 517 */ 518 public static File[] buildExternalStorageAndroidDataDirs() { 519 throwIfUserRequired(); 520 return sCurrentUser.buildExternalStorageAndroidDataDirs(); 521 } 522 523 /** 524 * Generates the raw path to an application's data 525 * @hide 526 */ 527 public static File[] buildExternalStorageAppDataDirs(String packageName) { 528 throwIfUserRequired(); 529 return sCurrentUser.buildExternalStorageAppDataDirs(packageName); 530 } 531 532 /** 533 * Generates the raw path to an application's media 534 * @hide 535 */ 536 public static File[] buildExternalStorageAppMediaDirs(String packageName) { 537 throwIfUserRequired(); 538 return sCurrentUser.buildExternalStorageAppMediaDirs(packageName); 539 } 540 541 /** 542 * Generates the raw path to an application's OBB files 543 * @hide 544 */ 545 public static File[] buildExternalStorageAppObbDirs(String packageName) { 546 throwIfUserRequired(); 547 return sCurrentUser.buildExternalStorageAppObbDirs(packageName); 548 } 549 550 /** 551 * Generates the path to an application's files. 552 * @hide 553 */ 554 public static File[] buildExternalStorageAppFilesDirs(String packageName) { 555 throwIfUserRequired(); 556 return sCurrentUser.buildExternalStorageAppFilesDirs(packageName); 557 } 558 559 /** 560 * Generates the path to an application's cache. 561 * @hide 562 */ 563 public static File[] buildExternalStorageAppCacheDirs(String packageName) { 564 throwIfUserRequired(); 565 return sCurrentUser.buildExternalStorageAppCacheDirs(packageName); 566 } 567 568 /** 569 * Return the download/cache content directory. 570 */ 571 public static File getDownloadCacheDirectory() { 572 return DIR_DOWNLOAD_CACHE; 573 } 574 575 /** 576 * Unknown storage state, such as when a path isn't backed by known storage 577 * media. 578 * 579 * @see #getExternalStorageState(File) 580 */ 581 public static final String MEDIA_UNKNOWN = "unknown"; 582 583 /** 584 * Storage state if the media is not present. 585 * 586 * @see #getExternalStorageState(File) 587 */ 588 public static final String MEDIA_REMOVED = "removed"; 589 590 /** 591 * Storage state if the media is present but not mounted. 592 * 593 * @see #getExternalStorageState(File) 594 */ 595 public static final String MEDIA_UNMOUNTED = "unmounted"; 596 597 /** 598 * Storage state if the media is present and being disk-checked. 599 * 600 * @see #getExternalStorageState(File) 601 */ 602 public static final String MEDIA_CHECKING = "checking"; 603 604 /** 605 * Storage state if the media is present but is blank or is using an 606 * unsupported filesystem. 607 * 608 * @see #getExternalStorageState(File) 609 */ 610 public static final String MEDIA_NOFS = "nofs"; 611 612 /** 613 * Storage state if the media is present and mounted at its mount point with 614 * read/write access. 615 * 616 * @see #getExternalStorageState(File) 617 */ 618 public static final String MEDIA_MOUNTED = "mounted"; 619 620 /** 621 * Storage state if the media is present and mounted at its mount point with 622 * read-only access. 623 * 624 * @see #getExternalStorageState(File) 625 */ 626 public static final String MEDIA_MOUNTED_READ_ONLY = "mounted_ro"; 627 628 /** 629 * Storage state if the media is present not mounted, and shared via USB 630 * mass storage. 631 * 632 * @see #getExternalStorageState(File) 633 */ 634 public static final String MEDIA_SHARED = "shared"; 635 636 /** 637 * Storage state if the media was removed before it was unmounted. 638 * 639 * @see #getExternalStorageState(File) 640 */ 641 public static final String MEDIA_BAD_REMOVAL = "bad_removal"; 642 643 /** 644 * Storage state if the media is present but cannot be mounted. Typically 645 * this happens if the file system on the media is corrupted. 646 * 647 * @see #getExternalStorageState(File) 648 */ 649 public static final String MEDIA_UNMOUNTABLE = "unmountable"; 650 651 /** 652 * Storage state if the media is in the process of being ejected. 653 * 654 * @see #getExternalStorageState(File) 655 */ 656 public static final String MEDIA_EJECTING = "ejecting"; 657 658 /** 659 * Returns the current state of the primary shared/external storage media. 660 * 661 * @see #getExternalStorageDirectory() 662 * @return one of {@link #MEDIA_UNKNOWN}, {@link #MEDIA_REMOVED}, 663 * {@link #MEDIA_UNMOUNTED}, {@link #MEDIA_CHECKING}, 664 * {@link #MEDIA_NOFS}, {@link #MEDIA_MOUNTED}, 665 * {@link #MEDIA_MOUNTED_READ_ONLY}, {@link #MEDIA_SHARED}, 666 * {@link #MEDIA_BAD_REMOVAL}, or {@link #MEDIA_UNMOUNTABLE}. 667 */ 668 public static String getExternalStorageState() { 669 final File externalDir = sCurrentUser.getExternalDirs()[0]; 670 return getExternalStorageState(externalDir); 671 } 672 673 /** 674 * @deprecated use {@link #getExternalStorageState(File)} 675 */ 676 @Deprecated 677 public static String getStorageState(File path) { 678 return getExternalStorageState(path); 679 } 680 681 /** 682 * Returns the current state of the shared/external storage media at the 683 * given path. 684 * 685 * @return one of {@link #MEDIA_UNKNOWN}, {@link #MEDIA_REMOVED}, 686 * {@link #MEDIA_UNMOUNTED}, {@link #MEDIA_CHECKING}, 687 * {@link #MEDIA_NOFS}, {@link #MEDIA_MOUNTED}, 688 * {@link #MEDIA_MOUNTED_READ_ONLY}, {@link #MEDIA_SHARED}, 689 * {@link #MEDIA_BAD_REMOVAL}, or {@link #MEDIA_UNMOUNTABLE}. 690 */ 691 public static String getExternalStorageState(File path) { 692 final StorageVolume volume = StorageManager.getStorageVolume(path, UserHandle.myUserId()); 693 if (volume != null) { 694 return volume.getState(); 695 } else { 696 return MEDIA_UNKNOWN; 697 } 698 } 699 700 /** 701 * Returns whether the primary shared/external storage media is physically 702 * removable. 703 * 704 * @return true if the storage device can be removed (such as an SD card), 705 * or false if the storage device is built in and cannot be 706 * physically removed. 707 */ 708 public static boolean isExternalStorageRemovable() { 709 if (isStorageDisabled()) return false; 710 final File externalDir = sCurrentUser.getExternalDirs()[0]; 711 return isExternalStorageRemovable(externalDir); 712 } 713 714 /** 715 * Returns whether the shared/external storage media at the given path is 716 * physically removable. 717 * 718 * @return true if the storage device can be removed (such as an SD card), 719 * or false if the storage device is built in and cannot be 720 * physically removed. 721 * @throws IllegalArgumentException if the path is not a valid storage 722 * device. 723 */ 724 public static boolean isExternalStorageRemovable(File path) { 725 final StorageVolume volume = StorageManager.getStorageVolume(path, UserHandle.myUserId()); 726 if (volume != null) { 727 return volume.isRemovable(); 728 } else { 729 throw new IllegalArgumentException("Failed to find storage device at " + path); 730 } 731 } 732 733 /** 734 * Returns whether the primary shared/external storage media is emulated. 735 * <p> 736 * The contents of emulated storage devices are backed by a private user 737 * data partition, which means there is little benefit to apps storing data 738 * here instead of the private directories returned by 739 * {@link Context#getFilesDir()}, etc. 740 * <p> 741 * This returns true when emulated storage is backed by either internal 742 * storage or an adopted storage device. 743 * 744 * @see DevicePolicyManager#setStorageEncryption(android.content.ComponentName, 745 * boolean) 746 */ 747 public static boolean isExternalStorageEmulated() { 748 if (isStorageDisabled()) return false; 749 final File externalDir = sCurrentUser.getExternalDirs()[0]; 750 return isExternalStorageEmulated(externalDir); 751 } 752 753 /** 754 * Returns whether the shared/external storage media at the given path is 755 * emulated. 756 * <p> 757 * The contents of emulated storage devices are backed by a private user 758 * data partition, which means there is little benefit to apps storing data 759 * here instead of the private directories returned by 760 * {@link Context#getFilesDir()}, etc. 761 * <p> 762 * This returns true when emulated storage is backed by either internal 763 * storage or an adopted storage device. 764 * 765 * @throws IllegalArgumentException if the path is not a valid storage 766 * device. 767 */ 768 public static boolean isExternalStorageEmulated(File path) { 769 final StorageVolume volume = StorageManager.getStorageVolume(path, UserHandle.myUserId()); 770 if (volume != null) { 771 return volume.isEmulated(); 772 } else { 773 throw new IllegalArgumentException("Failed to find storage device at " + path); 774 } 775 } 776 777 static File getDirectory(String variableName, String defaultPath) { 778 String path = System.getenv(variableName); 779 return path == null ? new File(defaultPath) : new File(path); 780 } 781 782 /** {@hide} */ 783 public static void setUserRequired(boolean userRequired) { 784 sUserRequired = userRequired; 785 } 786 787 private static void throwIfUserRequired() { 788 if (sUserRequired) { 789 Log.wtf(TAG, "Path requests must specify a user by using UserEnvironment", 790 new Throwable()); 791 } 792 } 793 794 /** 795 * Append path segments to each given base path, returning result. 796 * 797 * @hide 798 */ 799 public static File[] buildPaths(File[] base, String... segments) { 800 File[] result = new File[base.length]; 801 for (int i = 0; i < base.length; i++) { 802 result[i] = buildPath(base[i], segments); 803 } 804 return result; 805 } 806 807 /** 808 * Append path segments to given base path, returning result. 809 * 810 * @hide 811 */ 812 public static File buildPath(File base, String... segments) { 813 File cur = base; 814 for (String segment : segments) { 815 if (cur == null) { 816 cur = new File(segment); 817 } else { 818 cur = new File(cur, segment); 819 } 820 } 821 return cur; 822 } 823 824 private static boolean isStorageDisabled() { 825 return SystemProperties.getBoolean("config.disable_storage", false); 826 } 827 828 /** 829 * If the given path exists on emulated external storage, return the 830 * translated backing path hosted on internal storage. This bypasses any 831 * emulation later, improving performance. This is <em>only</em> suitable 832 * for read-only access. 833 * <p> 834 * Returns original path if given path doesn't meet these criteria. Callers 835 * must hold {@link android.Manifest.permission#WRITE_MEDIA_STORAGE} 836 * permission. 837 * 838 * @hide 839 */ 840 public static File maybeTranslateEmulatedPathToInternal(File path) { 841 return StorageManager.maybeTranslateEmulatedPathToInternal(path); 842 } 843} 844