Environment class of android, record it

String	MEDIA_BAD_REMOVAL	The storage media has been removed before being mounted.
String	MEDIA_CHECKING	Checking storage media.
String	MEDIA_MOUNTED	The storage media has been mounted and the mount point is readable/written.
String	MEDIA_MOUNTED_READ_ONLY	The storage media has been mounted and the mount point is read-only.
String	MEDIA_NOFS	The storage media is a blank or unsupported file system.
String	MEDIA_REMOVED	The storage media is removed.
String	MEDIA_SHARED	Storage media is being shared via USB.
String	MEDIA_UNMOUNTABLE	Storage media cannot be mounted.
String	MEDIA_UNMOUNTED	The storage media is not mounted.

 

 

Fields
Public static String	DIRECTORY_ALARMS	The standard directory for storing system notification ringtones.
Public static String	DIRECTORY_DCIM	The standard directory of photos and videos taken by the camera.
Public static String	DIRECTORY_DOWNLOADS	The downloaded standard directory.
Public static String	DIRECTORY_MOVIES	The standard directory for storing movies.
Public static String	DIRECTORY_MUSIC	Standard Directory for music storage.
Public static String	Directory_configurications	Standard Directory for storing system notification ringtones.
Public static String	DIRECTORY_PICTURES	Standard Directory for storing images.
Public static String	DIRECTORY_PODCASTS	Standard Directory for system broadcast storage.
Public static String	DIRECTORY_RINGTONES	Standard Directory for storing system ringtones.

 

 

 

 

Public Methods
Static File	GetDataDirectory () Obtain the android data directory.
Static File	GetDownloadCacheDirectory () Obtain the download cache directory.
Static File	GetExternalStorageDirectory () Or an external media directory.
Static File	GetExternalStoragePublicDirectory (String type) Get a top-level public external storage directory for placing files of a particle type.
Static String	GetExternalStorageState () Obtain the status of the current external storage media.
Static File	GetRootDirectory () Obtain the android directory.

 

 

 

Public static File getExternalStoragePublicDirectory (String type) Since: API Level 8

Get a top-level public external storage directory for placing files of a particle type. this is where the user will typically place and manage their own files, so you shoshould be careful about what you put here to ensure you don't erase their files or get in the way of their own organization.

Here is an example of typical code to manipulate a picture on the public external storage:

Void createExternalStoragePublicPicture () {// Create a path where we will place our picture in the user's // public pictures directory. note that you shoshould be careful about // what you place here, since the user often manages these files. for // pictures and other media owned by the application, consider // Context. getExternalMediaDir (). file path = Environment. getExternalStoragePublicDirectory (Environme Nt. DIRECTORY_PICTURES); File file = newFile (path, "DemoPicture.jpg"); try {// Make sure the Pictures directory exists. path. mkdirs (); // Very simple code to copy a picture from the application's // resource into the external file. note that this code does // no error checking, and assumes the picture is small (does not // try to copy it in chunks ). note that if external storage is // not currently mounted t His will silently fail. inputStreamis = getResources (). openRawResource (R. drawable. balloons); OutputStream OS = newFileOutputStream (file); byte [] data = newbyte [is. available ()]; is. read (data); OS. write (data); is. close (); OS. close (); // Tell the media transfer about the new file so that it is // this step is very important !! // Immediately available to the user. mediaScannerConnection. scanFile (this, newString [] {file. toString ()}, null, newMediaScannerConnection. onScanCompletedListener () {publicvoid onScanCompleted (String path, Uri uri) {Log. I ("ExternalStorage", "Scanned" + path + ":"); Log. I ("ExternalStorage", "-> uri =" + uri) ;}}) ;}catch (IOException e) {// Unable to create file, likely because external storage is // not currently mounted. log. w ("ExternalStorage", "Error writing" + file, e) ;}} void deleteExternalStoragePublicPicture () {// Create a path where we will place our picture in the user's // public pictures directory and delete the file. if external // storage is not currently mounted this will fail. file path = Environment. getExternalStoragePublicDirectory (Environment. DIRECTORY_PICTURES); File file = newFile (path, "DemoPicture.jpg"); file. delete ();} boolean hasExternalStoragePublicPicture () {// Create a path where we will place our picture in the user's // public pictures directory and check if the file exists. if // external storage is not currently mounted this will think the // picture doesn' t exist. file path = Environment. getExternalStoragePublicDirectory (Environment. DIRECTORY_PICTURES); File file = newFile (path, "DemoPicture.jpg"); return file. exists ();}

 

Parameters

Type	The type of storage directory to return. shocould be oneDIRECTORY_MUSIC,DIRECTORY_PODCASTS,DIRECTORY_RINGTONES,DIRECTORY_ALARMS,DIRECTORY_NOTIFICATIONS,DIRECTORY_PICTURES,DIRECTORY_MOVIES,DIRECTORY_DOWNLOADS, OrDIRECTORY_DCIM. May not be null.

Returns

• 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 asFile.mkdirs().

The above content is taken from the google android development document