BTChangeVisibility (Function)

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Visible radio and connection request
Required permissions
Limitation
Application in the background: Android 10 specific case

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BTChangeVisibility (Function)

In french: BTChangeVisibilité

Changes the visibility of a Bluetooth radio.

Remark: A Bluetooth radio corresponds to a Bluetooth transmitter. This transmitter can correspond to a Bluetooth USB key or it can be an element included in a computer (laptop for example).

Versions 16 and later

This function is now available for Android applications.

Caution: Bluetooth functions are not available in the Android emulator.

New in version 16

This function is now available for Android applications.

Caution: Bluetooth functions are not available in the Android emulator.

This function is now available for Android applications.

Caution: Bluetooth functions are not available in the Android emulator.

Example

bVisible is boolean
// Identifier of Bluetooth radios listed in a Table control
nRadioID is int
nRadioID = TABLE_Radios.COL_ID[TABLE_Radios]
// Checks whether the selected radio is visible
bVisible = BTIsVisible(nRadioID)
// Display
IF bVisible = True THEN
Trace("Visible")
ELSE
Trace("Not visible")
END
// Change the visibility
BTChangeVisibility(nRadioID, NOT bVisible)

Syntax

Syntax that can be used in Windows Hide the details

<Result> = BTChangeVisibilité(<Radio identifier> , <New status>)

<Result>: Boolean

True if the change of visibility was successfully performed,
False otherwise. ErrorInfo returns more details about the problem.

<Radio identifier>: Integer

Identifier of Bluetooth radio to use. This identifier is returned by BTListRadio.

<New status>: Boolean

True in order for the radio to become visible,
False in order for the radio to be hidden.

Syntax that can be used in Mobile and Android Hide the details

<Result> = BTChangeVisibilité(<New status> [, <Duration>])

<Result>: Boolean

True if the change of visibility was successfully performed,
False otherwise. ErrorInfo returns more details about the problem.

<New status>: Boolean

True in order for the radio to become visible,
False in order for the radio to be hidden.
Versions 16 and later
The visibility cannot be disabled by programming. This deactivation is temporary.
New in version 16
The visibility cannot be disabled by programming. This deactivation is temporary.
The visibility cannot be disabled by programming. This deactivation is temporary.

<Duration>: Optional integer or optional Duration

Duration (in seconds) during which the device must be made visible. This parameter must be included between 1 and 300 seconds. By default, the visibility duration is set to 120 seconds.
This parameter can correspond to:
an integer corresponding to the number of seconds,
a Duration variable,
Versions 23 and later
direct indication of the time (e.g. 1 s).
New in version 23
direct indication of the time (e.g. 1 s).
direct indication of the time (e.g. 1 s).
This parameter is ignored.

Remarks

Visible radio and connection request

A visible Bluetooth radio automatically accepts the connection requests. When BTChangeVisibility is used to make the radio visible, the call to BTChangeConnectivity is automatically performed.

Versions 16 and later

In Android, the visibility of the device in relation to the other Bluetooth devices is always temporary (up to 5 minutes). If BTChangeVisibilité is used to make the device visible, a system dialog box will be displayed to ask for user confirmation.
Remark: This dialog box is imposed by the Android system and therefore it cannot be avoided.

New in version 16

Versions 16 and later

Required permissions

The call to this function modifies the permissions required by the application.

Required permission: BLUETOOTH.

This permission allows the applications to connect to the Bluetooth services.

New in version 16

Required permissions

The call to this function modifies the permissions required by the application.

Required permission: BLUETOOTH.

This permission allows the applications to connect to the Bluetooth services.

Required permissions

The call to this function modifies the permissions required by the application.

Required permission: BLUETOOTH.

This permission allows the applications to connect to the Bluetooth services.

Limitation

Only the Microsoft Bluetooth stack is supported by this function. To find out the stack used, call BTStack.

See Which stacks to use? for more details

Versions 25 and later

Application in the background: Android 10 specific case

From Android 10, it is no longer possible to open a window when the application is in the background.

BTChangeVisibility can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). The application will be brought back to the foreground when the notification is clicked, if the ActivateApplication property is set to True. You can also open a window from the procedure passed to the ActionClick property.

For more details, see Android 10: Behavior of applications in the background.

New in version 25

Application in the background: Android 10 specific case

From Android 10, it is no longer possible to open a window when the application is in the background.

BTChangeVisibility can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). The application will be brought back to the foreground when the notification is clicked, if the ActivateApplication property is set to True. You can also open a window from the procedure passed to the ActionClick property.

For more details, see Android 10: Behavior of applications in the background.

Application in the background: Android 10 specific case

From Android 10, it is no longer possible to open a window when the application is in the background.

BTChangeVisibility can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). The application will be brought back to the foreground when the notification is clicked, if the ActivateApplication property is set to True. You can also open a window from the procedure passed to the ActionClick property.

For more details, see Android 10: Behavior of applications in the background.

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