| java.lang.Object | |
| ↳ | android.nfc.cardemulation.CardEmulation |
This class can be used to query the state of NFC card emulation services. For a general introduction into NFC card emulation, please read the NFC card emulation developer guide.
Use of this class requires the
FEATURE_NFC_HOST_CARD_EMULATION to be present
on the device.
| Constants | |||||||||||
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| String | ACTION_CHANGE_DEFAULT | Activity action: ask the user to change the default card emulation service for a certain category. | |||||||||
| String | CATEGORY_OTHER | Category that can be used for all other card emulation services. | |||||||||
| String | CATEGORY_PAYMENT | Category used for NFC payment services. | |||||||||
| String | EXTRA_CATEGORY | The category extra for ACTION_CHANGE_DEFAULT. |
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| String | EXTRA_SERVICE_COMPONENT | The service ComponentName object passed in as an
extra for ACTION_CHANGE_DEFAULT. |
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| int | SELECTION_MODE_ALWAYS_ASK | Return value for getSelectionModeForCategory(String). |
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| int | SELECTION_MODE_ASK_IF_CONFLICT | Return value for getSelectionModeForCategory(String). |
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| int | SELECTION_MODE_PREFER_DEFAULT | Return value for getSelectionModeForCategory(String). |
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| Public Methods | |||||||||||
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Helper to get an instance of this class.
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Returns the service selection mode for the passed in category.
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Allows an application to query whether a service is currently
the default handler for a specified ISO7816-4 Application ID.
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Allows an application to query whether a service is currently
the default service to handle a card emulation category.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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Activity action: ask the user to change the default
card emulation service for a certain category. This will
show a dialog that asks the user whether he wants to
replace the current default service with the service
identified with the ComponentName specified in
EXTRA_SERVICE_COMPONENT, for the category
specified in EXTRA_CATEGORY
Category that can be used for all other card emulation services.
Category used for NFC payment services.
The service ComponentName object passed in as an
extra for ACTION_CHANGE_DEFAULT.
Return value for getSelectionModeForCategory(String).
In this mode, when using ISO-DEP card emulation with HostApduService
or OffHostApduService, whenever an Application ID (AID) of this category
is selected, the user is asked which service he wants to use to handle
the transaction, even if there is only one matching service.
Return value for getSelectionModeForCategory(String).
In this mode, when using ISO-DEP card emulation with HostApduService
or OffHostApduService, the user will only be asked to select a service
if the Application ID (AID) selected by the reader has been registered by multiple
services. If there is only one service that has registered for the AID,
that service will be invoked directly.
Return value for getSelectionModeForCategory(String).
In this mode, the user has set a default service for this category.
When using ISO-DEP card emulation with HostApduService
or OffHostApduService, if a remote NFC device selects
any of the Application IDs (AIDs)
that the default service has registered in this category,
that service will automatically be bound to to handle
the transaction.
Helper to get an instance of this class.
| adapter | A reference to an NfcAdapter object. |
|---|
Returns the service selection mode for the passed in category. Valid return values are:
SELECTION_MODE_PREFER_DEFAULT the user has requested a default
service for this category, which will be preferred.
SELECTION_MODE_ALWAYS_ASK the user has requested to be asked
every time what service he would like to use in this category.
SELECTION_MODE_ASK_IF_CONFLICT the user will only be asked
to pick a service if there is a conflict.
| category | The category, for example CATEGORY_PAYMENT |
|---|
Allows an application to query whether a service is currently the default handler for a specified ISO7816-4 Application ID.
| service | The ComponentName of the service |
|---|---|
| aid | The ISO7816-4 Application ID |
Requires the NFC permission.
Allows an application to query whether a service is currently the default service to handle a card emulation category.
Note that if getSelectionModeForCategory(String)
returns SELECTION_MODE_ALWAYS_ASK or SELECTION_MODE_ASK_IF_CONFLICT,
this method will always return false. That is because in these
selection modes a default can't be set at the category level. For categories where
the selection mode is SELECTION_MODE_ALWAYS_ASK or
SELECTION_MODE_ASK_IF_CONFLICT, use
isDefaultServiceForAid(ComponentName, String) to determine whether a service
is the default for a specific AID.
| service | The ComponentName of the service |
|---|---|
| category | The category |
Requires the NFC permission.