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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 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);
}
}
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