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Android APIs
public class

DownloadManager

extends Object
java.lang.Object
   ↳ android.app.DownloadManager

Class Overview

The download manager is a system service that handles long-running HTTP downloads. Clients may request that a URI be downloaded to a particular destination file. The download manager will conduct the download in the background, taking care of HTTP interactions and retrying downloads after failures or across connectivity changes and system reboots. Instances of this class should be obtained through getSystemService(String) by passing DOWNLOAD_SERVICE. Apps that request downloads through this API should register a broadcast receiver for ACTION_NOTIFICATION_CLICKED to appropriately handle when the user clicks on a running download in a notification or from the downloads UI. Note that the application must have the INTERNET permission to use this class.

Summary

Nested Classes
class DownloadManager.Query This class may be used to filter download manager queries. 
class DownloadManager.Request This class contains all the information necessary to request a new download. 
Constants
String ACTION_DOWNLOAD_COMPLETE Broadcast intent action sent by the download manager when a download completes.
String ACTION_NOTIFICATION_CLICKED Broadcast intent action sent by the download manager when the user clicks on a running download, either from a system notification or from the downloads UI.
String ACTION_VIEW_DOWNLOADS Intent action to launch an activity to display all downloads.
String COLUMN_BYTES_DOWNLOADED_SO_FAR Number of bytes download so far.
String COLUMN_DESCRIPTION The client-supplied description of this download.
String COLUMN_ID An identifier for a particular download, unique across the system.
String COLUMN_LAST_MODIFIED_TIMESTAMP Timestamp when the download was last modified, in System.currentTimeMillis() (wall clock time in UTC).
String COLUMN_LOCAL_FILENAME The pathname of the file where the download is stored.
String COLUMN_LOCAL_URI Uri where downloaded file will be stored.
String COLUMN_MEDIAPROVIDER_URI The URI to the corresponding entry in MediaProvider for this downloaded entry.
String COLUMN_MEDIA_TYPE Internet Media Type of the downloaded file.
String COLUMN_REASON Provides more detail on the status of the download.
String COLUMN_STATUS Current status of the download, as one of the STATUS_* constants.
String COLUMN_TITLE The client-supplied title for this download.
String COLUMN_TOTAL_SIZE_BYTES Total size of the download in bytes.
String COLUMN_URI URI to be downloaded.
int ERROR_CANNOT_RESUME Value of COLUMN_REASON when some possibly transient error occurred but we can't resume the download.
int ERROR_DEVICE_NOT_FOUND Value of COLUMN_REASON when no external storage device was found.
int ERROR_FILE_ALREADY_EXISTS Value of COLUMN_REASON when the requested destination file already exists (the download manager will not overwrite an existing file).
int ERROR_FILE_ERROR Value of COLUMN_REASON when a storage issue arises which doesn't fit under any other error code.
int ERROR_HTTP_DATA_ERROR Value of COLUMN_REASON when an error receiving or processing data occurred at the HTTP level.
int ERROR_INSUFFICIENT_SPACE Value of COLUMN_REASON when there was insufficient storage space.
int ERROR_TOO_MANY_REDIRECTS Value of COLUMN_REASON when there were too many redirects.
int ERROR_UNHANDLED_HTTP_CODE Value of COLUMN_REASON when an HTTP code was received that download manager can't handle.
int ERROR_UNKNOWN Value of COLUMN_ERROR_CODE when the download has completed with an error that doesn't fit under any other error code.
String EXTRA_DOWNLOAD_ID Intent extra included with ACTION_DOWNLOAD_COMPLETE intents, indicating the ID (as a long) of the download that just completed.
String EXTRA_NOTIFICATION_CLICK_DOWNLOAD_IDS When clicks on multiple notifications are received, the following provides an array of download ids corresponding to the download notification that was clicked.
String INTENT_EXTRAS_SORT_BY_SIZE Intent extra included with ACTION_VIEW_DOWNLOADS to start DownloadApp in sort-by-size mode.
int PAUSED_QUEUED_FOR_WIFI Value of COLUMN_REASON when the download exceeds a size limit for downloads over the mobile network and the download manager is waiting for a Wi-Fi connection to proceed.
int PAUSED_UNKNOWN Value of COLUMN_REASON when the download is paused for some other reason.
int PAUSED_WAITING_FOR_NETWORK Value of COLUMN_REASON when the download is waiting for network connectivity to proceed.
int PAUSED_WAITING_TO_RETRY Value of COLUMN_REASON when the download is paused because some network error occurred and the download manager is waiting before retrying the request.
int STATUS_FAILED Value of COLUMN_STATUS when the download has failed (and will not be retried).
int STATUS_PAUSED Value of COLUMN_STATUS when the download is waiting to retry or resume.
int STATUS_PENDING Value of COLUMN_STATUS when the download is waiting to start.
int STATUS_RUNNING Value of COLUMN_STATUS when the download is currently running.
int STATUS_SUCCESSFUL Value of COLUMN_STATUS when the download has successfully completed.
Public Methods
long addCompletedDownload(String title, String description, boolean isMediaScannerScannable, String mimeType, String path, long length, boolean showNotification)
Adds a file to the downloads database system, so it could appear in Downloads App (and thus become eligible for management by the Downloads App).
long enqueue(DownloadManager.Request request)
Enqueue a new download.
static Long getMaxBytesOverMobile(Context context)
Returns maximum size, in bytes, of downloads that may go over a mobile connection; or null if there's no limit
String getMimeTypeForDownloadedFile(long id)
Returns the media type of the given downloaded file id, if the file was downloaded successfully.
static Long getRecommendedMaxBytesOverMobile(Context context)
Returns recommended maximum size, in bytes, of downloads that may go over a mobile connection; or null if there's no recommended limit.
Uri getUriForDownloadedFile(long id)
Returns the Uri of the given downloaded file id, if the file is downloaded successfully.
ParcelFileDescriptor openDownloadedFile(long id)
Open a downloaded file for reading.
Cursor query(DownloadManager.Query query)
Query the download manager about downloads that have been requested.
int remove(long... ids)
Cancel downloads and remove them from the download manager.
[Expand]
Inherited Methods
From class java.lang.Object

Constants

public static final String ACTION_DOWNLOAD_COMPLETE

Added in API level 9

Broadcast intent action sent by the download manager when a download completes.

Constant Value: "android.intent.action.DOWNLOAD_COMPLETE"

public static final String ACTION_NOTIFICATION_CLICKED

Added in API level 9

Broadcast intent action sent by the download manager when the user clicks on a running download, either from a system notification or from the downloads UI.

Constant Value: "android.intent.action.DOWNLOAD_NOTIFICATION_CLICKED"

public static final String ACTION_VIEW_DOWNLOADS

Added in API level 9

Intent action to launch an activity to display all downloads.

Constant Value: "android.intent.action.VIEW_DOWNLOADS"

public static final String COLUMN_BYTES_DOWNLOADED_SO_FAR

Added in API level 9

Number of bytes download so far.

Constant Value: "bytes_so_far"

public static final String COLUMN_DESCRIPTION

Added in API level 9

The client-supplied description of this download. This will be displayed in system notifications. Defaults to the empty string.

Constant Value: "description"

public static final String COLUMN_ID

Added in API level 9

An identifier for a particular download, unique across the system. Clients use this ID to make subsequent calls related to the download.

Constant Value: "_id"

public static final String COLUMN_LAST_MODIFIED_TIMESTAMP

Added in API level 9

Timestamp when the download was last modified, in System.currentTimeMillis() (wall clock time in UTC).

Constant Value: "last_modified_timestamp"

public static final String COLUMN_LOCAL_FILENAME

Added in API level 11

The pathname of the file where the download is stored.

Constant Value: "local_filename"

public static final String COLUMN_LOCAL_URI

Added in API level 9

Uri where downloaded file will be stored. If a destination is supplied by client, that URI will be used here. Otherwise, the value will initially be null and will be filled in with a generated URI once the download has started.

Constant Value: "local_uri"

public static final String COLUMN_MEDIAPROVIDER_URI

Added in API level 9

The URI to the corresponding entry in MediaProvider for this downloaded entry. It is used to delete the entries from MediaProvider database when it is deleted from the downloaded list.

Constant Value: "mediaprovider_uri"

public static final String COLUMN_MEDIA_TYPE

Added in API level 9

Internet Media Type of the downloaded file. If no value is provided upon creation, this will initially be null and will be filled in based on the server's response once the download has started.

Constant Value: "media_type"

public static final String COLUMN_REASON

Added in API level 9

Provides more detail on the status of the download. Its meaning depends on the value of COLUMN_STATUS. When COLUMN_STATUS is STATUS_FAILED, this indicates the type of error that occurred. If an HTTP error occurred, this will hold the HTTP status code as defined in RFC 2616. Otherwise, it will hold one of the ERROR_* constants. When COLUMN_STATUS is STATUS_PAUSED, this indicates why the download is paused. It will hold one of the PAUSED_* constants. If COLUMN_STATUS is neither STATUS_FAILED nor STATUS_PAUSED, this column's value is undefined.

Constant Value: "reason"

public static final String COLUMN_STATUS

Added in API level 9

Current status of the download, as one of the STATUS_* constants.

Constant Value: "status"

public static final String COLUMN_TITLE

Added in API level 9

The client-supplied title for this download. This will be displayed in system notifications. Defaults to the empty string.

Constant Value: "title"

public static final String COLUMN_TOTAL_SIZE_BYTES

Added in API level 9

Total size of the download in bytes. This will initially be -1 and will be filled in once the download starts.

Constant Value: "total_size"

public static final String COLUMN_URI

Added in API level 9

URI to be downloaded.

Constant Value: "uri"

public static final int ERROR_CANNOT_RESUME

Added in API level 9

Value of COLUMN_REASON when some possibly transient error occurred but we can't resume the download.

Constant Value: 1008 (0x000003f0)

public static final int ERROR_DEVICE_NOT_FOUND

Added in API level 9

Value of COLUMN_REASON when no external storage device was found. Typically, this is because the SD card is not mounted.

Constant Value: 1007 (0x000003ef)

public static final int ERROR_FILE_ALREADY_EXISTS

Added in API level 9

Value of COLUMN_REASON when the requested destination file already exists (the download manager will not overwrite an existing file).

Constant Value: 1009 (0x000003f1)

public static final int ERROR_FILE_ERROR

Added in API level 9

Value of COLUMN_REASON when a storage issue arises which doesn't fit under any other error code. Use the more specific ERROR_INSUFFICIENT_SPACE and ERROR_DEVICE_NOT_FOUND when appropriate.

Constant Value: 1001 (0x000003e9)

public static final int ERROR_HTTP_DATA_ERROR

Added in API level 9

Value of COLUMN_REASON when an error receiving or processing data occurred at the HTTP level.

Constant Value: 1004 (0x000003ec)

public static final int ERROR_INSUFFICIENT_SPACE

Added in API level 9

Value of COLUMN_REASON when there was insufficient storage space. Typically, this is because the SD card is full.

Constant Value: 1006 (0x000003ee)

public static final int ERROR_TOO_MANY_REDIRECTS

Added in API level 9

Value of COLUMN_REASON when there were too many redirects.

Constant Value: 1005 (0x000003ed)

public static final int ERROR_UNHANDLED_HTTP_CODE

Added in API level 9

Value of COLUMN_REASON when an HTTP code was received that download manager can't handle.

Constant Value: 1002 (0x000003ea)

public static final int ERROR_UNKNOWN

Added in API level 9

Value of COLUMN_ERROR_CODE when the download has completed with an error that doesn't fit under any other error code.

Constant Value: 1000 (0x000003e8)

public static final String EXTRA_DOWNLOAD_ID

Added in API level 9

Intent extra included with ACTION_DOWNLOAD_COMPLETE intents, indicating the ID (as a long) of the download that just completed.

Constant Value: "extra_download_id"

public static final String EXTRA_NOTIFICATION_CLICK_DOWNLOAD_IDS

Added in API level 11

When clicks on multiple notifications are received, the following provides an array of download ids corresponding to the download notification that was clicked. It can be retrieved by the receiver of this Intent using getLongArrayExtra(String).

Constant Value: "extra_click_download_ids"

public static final String INTENT_EXTRAS_SORT_BY_SIZE

Added in API level 12

Intent extra included with ACTION_VIEW_DOWNLOADS to start DownloadApp in sort-by-size mode.

Constant Value: "android.app.DownloadManager.extra_sortBySize"

public static final int PAUSED_QUEUED_FOR_WIFI

Added in API level 9

Value of COLUMN_REASON when the download exceeds a size limit for downloads over the mobile network and the download manager is waiting for a Wi-Fi connection to proceed.

Constant Value: 3 (0x00000003)

public static final int PAUSED_UNKNOWN

Added in API level 9

Value of COLUMN_REASON when the download is paused for some other reason.

Constant Value: 4 (0x00000004)

public static final int PAUSED_WAITING_FOR_NETWORK

Added in API level 9

Value of COLUMN_REASON when the download is waiting for network connectivity to proceed.

Constant Value: 2 (0x00000002)

public static final int PAUSED_WAITING_TO_RETRY

Added in API level 9

Value of COLUMN_REASON when the download is paused because some network error occurred and the download manager is waiting before retrying the request.

Constant Value: 1 (0x00000001)

public static final int STATUS_FAILED

Added in API level 9

Value of COLUMN_STATUS when the download has failed (and will not be retried).

Constant Value: 16 (0x00000010)

public static final int STATUS_PAUSED

Added in API level 9

Value of COLUMN_STATUS when the download is waiting to retry or resume.

Constant Value: 4 (0x00000004)

public static final int STATUS_PENDING

Added in API level 9

Value of COLUMN_STATUS when the download is waiting to start.

Constant Value: 1 (0x00000001)

public static final int STATUS_RUNNING

Added in API level 9

Value of COLUMN_STATUS when the download is currently running.

Constant Value: 2 (0x00000002)

public static final int STATUS_SUCCESSFUL

Added in API level 9

Value of COLUMN_STATUS when the download has successfully completed.

Constant Value: 8 (0x00000008)

Public Methods

public long addCompletedDownload (String title, String description, boolean isMediaScannerScannable, String mimeType, String path, long length, boolean showNotification)

Added in API level 12

Adds a file to the downloads database system, so it could appear in Downloads App (and thus become eligible for management by the Downloads App).

It is helpful to make the file scannable by MediaScanner by setting the param isMediaScannerScannable to true. It makes the file visible in media managing applications such as Gallery App, which could be a useful purpose of using this API.

Parameters
title the title that would appear for this file in Downloads App.
description the description that would appear for this file in Downloads App.
isMediaScannerScannable true if the file is to be scanned by MediaScanner. Files scanned by MediaScanner appear in the applications used to view media (for example, Gallery app).
mimeType mimetype of the file.
path absolute pathname to the file. The file should be world-readable, so that it can be managed by the Downloads App and any other app that is used to read it (for example, Gallery app to display the file, if the file contents represent a video/image).
length length of the downloaded file
showNotification true if a notification is to be sent, false otherwise
Returns
  • an ID for the download entry added to the downloads app, unique across the system This ID is used to make future calls related to this download.

public long enqueue (DownloadManager.Request request)

Added in API level 9

Enqueue a new download. The download will start automatically once the download manager is ready to execute it and connectivity is available.

Parameters
request the parameters specifying this download
Returns
  • an ID for the download, unique across the system. This ID is used to make future calls related to this download.

public static Long getMaxBytesOverMobile (Context context)

Added in API level 11

Returns maximum size, in bytes, of downloads that may go over a mobile connection; or null if there's no limit

Parameters
context the Context to use for accessing the ContentResolver
Returns
  • maximum size, in bytes, of downloads that may go over a mobile connection; or null if there's no limit

public String getMimeTypeForDownloadedFile (long id)

Added in API level 11

Returns the media type of the given downloaded file id, if the file was downloaded successfully. Otherwise, null is returned.

Parameters
id the id of the downloaded file.
Returns
  • the media type of the given downloaded file id, if download was successful. null otherwise.

public static Long getRecommendedMaxBytesOverMobile (Context context)

Added in API level 11

Returns recommended maximum size, in bytes, of downloads that may go over a mobile connection; or null if there's no recommended limit. The user will have the option to bypass this limit.

Parameters
context the Context to use for accessing the ContentResolver
Returns
  • recommended maximum size, in bytes, of downloads that may go over a mobile connection; or null if there's no recommended limit.

public Uri getUriForDownloadedFile (long id)

Added in API level 11

Returns the Uri of the given downloaded file id, if the file is downloaded successfully. Otherwise, null is returned.

If the specified downloaded file is in external storage (for example, /sdcard dir), then it is assumed to be safe for anyone to read and the returned Uri corresponds to the filepath on sdcard.

Parameters
id the id of the downloaded file.
Returns
  • the Uri of the given downloaded file id, if download was successful. null otherwise.

public ParcelFileDescriptor openDownloadedFile (long id)

Added in API level 9

Open a downloaded file for reading. The download must have completed.

Parameters
id the ID of the download
Returns
Throws
FileNotFoundException if the destination file does not already exist

public Cursor query (DownloadManager.Query query)

Added in API level 9

Query the download manager about downloads that have been requested.

Parameters
query parameters specifying filters for this query
Returns
  • a Cursor over the result set of downloads, with columns consisting of all the COLUMN_* constants.

public int remove (long... ids)

Added in API level 9

Cancel downloads and remove them from the download manager. Each download will be stopped if it was running, and it will no longer be accessible through the download manager. If there is a downloaded file, partial or complete, it is deleted.

Parameters
ids the IDs of the downloads to remove
Returns
  • the number of downloads actually removed