程序包 ohos.data.usage

类 DataUsage

java.lang.Object

ohos.data.usage.DataUsage

public final class DataUsage
extends Object

A basic class for device space management. This class provides interfaces to query information about external storage devices, such as their mount state and whether they are pluggable.

从以下版本开始:

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方法概要

限定符和类型	方法	说明
static MountState	getDiskMountedStatus()	Queries the mount state of the primary device.
static MountState	getDiskMountedStatus(File path)	Queries the mount state of the device that houses a specified file path.
static Optional<Volume>	getVolume(File file)	Obtains the device volume that houses a specified file path.
static Optional<Volume>	getVolume(Context context, Uri uri)	Obtains the device volume with a specified URI.
static Optional<List<Volume>>	getVolumes()	Obtains the list of all available device volumes.
static boolean	isDiskEmulated()	Checks whether the primary device is emulated.
static boolean	isDiskEmulated(File path)	Checks whether the device that houses the specified file path is emulated.
static boolean	isDiskPluggable()	Checks whether the primary device is pluggable.
static boolean	isDiskPluggable(File path)	Checks whether the device that houses a specified file path is pluggable.
static boolean	isSupported()	Checks whether DataUsage is supported on current device.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

方法详细资料

isSupported

public static boolean isSupported()

Checks whether DataUsage is supported on current device.

返回:

Returns true if DataUsage is supported on current device; returns false otherwise.

从以下版本开始:

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getDiskMountedStatus

public static MountState getDiskMountedStatus()

Queries the mount state of the primary device. The mount state can be mounted, unmounted, removed, or unknown.

返回:

Returns MountState, which indicates the mount state of the primary device.

从以下版本开始:

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getDiskMountedStatus

public static MountState getDiskMountedStatus(File path)

Queries the mount state of the device that houses a specified file path. The mount state can be mounted, unmounted, removed, or unknown.

参数:

path - Indicates the specified file path.

返回:

Returns MountState, which indicates the mount state of the device that houses the specified file path.

从以下版本开始:

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isDiskPluggable

public static boolean isDiskPluggable()

Checks whether the primary device is pluggable.

返回:

Returns true if the primary device is pluggable; returns false otherwise.

从以下版本开始:

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isDiskPluggable

public static boolean isDiskPluggable(File path)

Checks whether the device that houses a specified file path is pluggable.

参数:

path - Indicates the specified file path.

返回:

Returns true if the device is pluggable; returns false otherwise.

从以下版本开始:

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getVolumes

public static Optional<List<Volume>> getVolumes()

Obtains the list of all available device volumes. You can also query information about each device, such as its mount state and whether it is pluggable.

返回:

Returns the list of all available devices.

从以下版本开始:

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getVolume

public static Optional<Volume> getVolume(File file)

Obtains the device volume that houses a specified file path. You can also query information about the device, such as its mount state and whether it is pluggable.

参数:

file - Indicates the specified file path.

返回:

Returns the device volume that houses the specified file path.

从以下版本开始:

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getVolume

public static Optional<Volume> getVolume(Context context,
                                         Uri uri)

Obtains the device volume with a specified URI. You can also query information about the device, such as its mount state and whether it is pluggable.

参数:

context - Indicates the application context.

uri - Indicates the specified URI, which must be of the multimedia type. The current application must have the permission to access the URI.

返回:

Returns the device volume with the specified URI.

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isDiskEmulated

public static boolean isDiskEmulated()

Checks whether the primary device is emulated.

返回:

Returns true if the primary device is emulated; returns false otherwise.

从以下版本开始:

3

isDiskEmulated

public static boolean isDiskEmulated(File path)

Checks whether the device that houses the specified file path is emulated.

参数:

path - Indicates the file path.

返回:

Returns true if the device is emulated; returns false otherwise.

从以下版本开始:

3