auto import from //depot/cupcake/@135843
diff --git a/core/java/android/os/Environment.java b/core/java/android/os/Environment.java
new file mode 100644
index 0000000..f761e8e
--- /dev/null
+++ b/core/java/android/os/Environment.java
@@ -0,0 +1,131 @@
+/*
+ * 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 java.io.File;
+
+/**
+ * Provides access to environment variables.
+ */
+public class Environment {
+
+ private static final File ROOT_DIRECTORY
+ = getDirectory("ANDROID_ROOT", "/system");
+
+ /**
+ * Gets the Android root directory.
+ */
+ public static File getRootDirectory() {
+ return ROOT_DIRECTORY;
+ }
+
+ private static final File DATA_DIRECTORY
+ = getDirectory("ANDROID_DATA", "/data");
+
+ private static final File EXTERNAL_STORAGE_DIRECTORY
+ = getDirectory("EXTERNAL_STORAGE", "/sdcard");
+
+ private static final File DOWNLOAD_CACHE_DIRECTORY
+ = getDirectory("DOWNLOAD_CACHE", "/cache");
+
+ /**
+ * Gets the Android data directory.
+ */
+ public static File getDataDirectory() {
+ return DATA_DIRECTORY;
+ }
+
+ /**
+ * Gets the Android external storage directory.
+ */
+ public static File getExternalStorageDirectory() {
+ return EXTERNAL_STORAGE_DIRECTORY;
+ }
+
+ /**
+ * Gets the Android Download/Cache content directory.
+ */
+ public static File getDownloadCacheDirectory() {
+ return DOWNLOAD_CACHE_DIRECTORY;
+ }
+
+ /**
+ * getExternalStorageState() returns MEDIA_REMOVED if the media is not present.
+ */
+ public static final String MEDIA_REMOVED = "removed";
+
+ /**
+ * getExternalStorageState() returns MEDIA_UNMOUNTED if the media is present
+ * but not mounted.
+ */
+ public static final String MEDIA_UNMOUNTED = "unmounted";
+
+ /**
+ * getExternalStorageState() returns MEDIA_CHECKING if the media is present
+ * and being disk-checked
+ */
+ public static final String MEDIA_CHECKING = "checking";
+
+ /**
+ * getExternalStorageState() returns MEDIA_NOFS if the media is present
+ * but is blank or is using an unsupported filesystem
+ */
+ public static final String MEDIA_NOFS = "nofs";
+
+ /**
+ * getExternalStorageState() returns MEDIA_MOUNTED if the media is present
+ * and mounted at its mount point with read/write access.
+ */
+ public static final String MEDIA_MOUNTED = "mounted";
+
+ /**
+ * getExternalStorageState() returns MEDIA_MOUNTED_READ_ONLY if the media is present
+ * and mounted at its mount point with read only access.
+ */
+ public static final String MEDIA_MOUNTED_READ_ONLY = "mounted_ro";
+
+ /**
+ * getExternalStorageState() returns MEDIA_SHARED if the media is present
+ * not mounted, and shared via USB mass storage.
+ */
+ public static final String MEDIA_SHARED = "shared";
+
+ /**
+ * getExternalStorageState() returns MEDIA_BAD_REMOVAL if the media was
+ * removed before it was unmounted.
+ */
+ public static final String MEDIA_BAD_REMOVAL = "bad_removal";
+
+ /**
+ * getExternalStorageState() returns MEDIA_UNMOUNTABLE if the media is present
+ * but cannot be mounted. Typically this happens if the file system on the
+ * media is corrupted.
+ */
+ public static final String MEDIA_UNMOUNTABLE = "unmountable";
+
+ /**
+ * Gets the current state of the external storage device.
+ */
+ public static String getExternalStorageState() {
+ return SystemProperties.get("EXTERNAL_STORAGE_STATE", MEDIA_REMOVED);
+ }
+
+ static File getDirectory(String variableName, String defaultPath) {
+ String path = System.getenv(variableName);
+ return path == null ? new File(defaultPath) : new File(path);
+ }
+}