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Classic Bluetooth Extension
See the App Inventor Extensions document about how to use an App Inventor Extension.
For questions about this extension or bug reports please start a new thread in the App Inventor community. Thank you.
For feature requests please contact me by email. To be a sponsor of a new method already is possible starting from only 10 USD! With your contribution you will help the complete App Inventor community. Thank you.
Nov 6th, 2016: Version 1: initial version
Jul 17th, 2017: Version 2: property DisplayRSSI added
Jul 23th, 2017: Version 2a: new build using extension-specific directory in aix file
Oct 21th, 2019: Version 3: for mac address method return default mac address for devices >= Android 8, SetDiscoverable method added
Oct 29th, 2019: Version 3a: Remove duplicates while scanning. Note: 'display RSSI after scan' should be disabled for this to work!
Nov 10th, 2020: Version 4: property DisplayDeviceType added, API29 update concerning path to assets for companion app
Jan 7th, 2021: Version 4a: android.permission.ACCESS_FINE_LOCATION required starting from Android 10
Description
Bluetooth extension.
Minimum API version for this extension is API version 18, which is Android 4.3 (Jelly Bean MR2).
Required permission: android.permission.BLUETOOTH_ADMIN, android.permission.BLUETOOTH, android.permission.ACCESS_FINE_LOCATION, android.permission.READ_EXTERNAL_STORAGE
Properties
Get DisplayRSSI, i.e. whether RSSI (Received Signal Strength Indication) should be displayed after Scanning.
Thank you Merciful for being the sponsor of this functionality.
Set DisplayRSSI, i.e. whether RSSI (Received Signal Strength Indication) should be displayed after Scanning.
Thank you Merciful for being the sponsor of this functionality.
Get Display Device Type, i.e. whether Device Type should be displayed after Scanning.
Thank you 18637 for being the sponsor of this functionality.
Set Display Device Type, i.e. whether Device Type should be displayed after Scanning.
Thank you 18637 for being the sponsor of this functionality.
Methods
Get Bluetooth state.
Possible values: Bluetooth off, Turning Bluetooth off, Bluetooth on, Turning Bluetooth on, Unknown.
Enable Bluetooth without user interaction!
Note: According to the Android documentation, Bluetooth should never be enabled without direct user consent. If you want to turn on Bluetooth in order to create a wireless connection, you should use the ACTION_REQUEST_ENABLE Intent, which will raise a dialog that requests user permission to turn on Bluetooth, see also this snippet.
Disable Bluetooth
Returns Bluetooth MAC address for devices < Android 8. Starting from Android 8, the default mac address 02:00:00:00:00:00 will be returned.
Note: Starting from Android Oreo, the bluetooth mac address is only available to system apps. See also this stackoverflow answer.
Scan Bluetooth devices.
Caution: Performing device discovery is a heavy procedure for the Bluetooth adapter and will consume a lot of its resources. If you already hold a connection with a device, then performing discovery can significantly reduce the bandwidth available for the connection, so you should not perform discovery while connected.
Note: you will have to ask for the permission ACCESS_COARSE_LOCATION before using this method. See the example project about how to do it.
Note: if you use the flag 'display RSSI after scan' you might get duplicates after scanning because the RSSI might change during the scan.
Note: if you use the flag 'display display type after scan' you additionally will get the device type of the detected device, possible values are CLASSIC, BLE, DUAL, UNKNOWN.
Pair Bluetooth device. You will have to accept the connection on the other device manually.
This is currently an experimental block.
Unpair Bluetooth device.
Set device as discoverable. Duration is in seconds. The maximum duration is capped at 300 seconds for each request.
Events
Event indicating that the bluetooth state changed.
Possible values: Bluetooth off, Turning Bluetooth off, Bluetooth on, Turning Bluetooth on, Unknown.
Event indicating that Scanning has finished.
As result two lists will be provided, a list with already paired devices and a list with new devices.
Event indicating that Pairing has finished.
Event indicating that Unpairing has finished.
Event raised after setting device to discoverable.
Event indicating that an error occurred.
Example App: Bluetooth Extension Test
Questions and Answers
Q1: It's too long for search for devices, it lasts 60 seconds. It is possible to make search of devices with timing in seconds? For example to search for devices produced 3 seconds or 5 seconds so that the user himself could choose the time of search the Bluetooth devices.
A: Unfortunately this is not possible. The scan process takes its time. Also performing device discovery is a heavy procedure for the Bluetooth adapter and will consume a lot of its resources. Probably the Bluetooth Low Energy Extension by MIT offers a faster scan method. You might want to check...
Q2: When the Bluetooth device is connected to the phone, search TaifunBluetooth will no longer see the device. Is it possible to fix it?
A: If you are already connected, there is no need to scan for the same device, is it? Also if you already hold a connection with a device, then performing discovery can significantly reduce the bandwidth available for the connection, so you should not perform discovery while connected.
For questions about App Inventor,
please ask in the App Inventor community.Thank you.
Test the functionality of the Bluetooth extension
The test app is available in Google Play. You can test the example following these steps
App Inventor Software
- Follow the opt-in URL to get access to the app and to be able to download it to your device. It might take a few hours for Google to enable you as beta tester!
- Start testing.