My app about ble can not work please help me!

MIT App Inventor Help
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Make sure your companion app and BLE extension are updated to the latest versions (2.68 for companion). Also, please translate your blocks to English when you screenshot them.

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Thank you very much for your reply. Please see my English picture。
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Make sure your BLE release is current.

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It seems like you are building your app on a server that is out of date. The isDeniedPermission method was introduced in Form in nb172 (late 2018). Which server are you using?

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Hello Isy

Looks like you are using a very old App Example? In any case, you cannot test a Bluetooth application with the Emulator - you must instead either use the Companion on your phone or an APK on your phone.

Since we have seen a photo of your phone - please tell us the exact Model Name, Android Version and Bluetooth version.

Also, what exactly are you trying to connect to? Model Name and Bluetooth Version. If it is a microcontroller such as Arduino or ESP32, please post the Script (Sketch) here.

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thanks , my BLE release is 20230728

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I use MIT APP Inventor2

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Thank you very much for your reply. I want to connect my ESP32 BLE,but this problem occurs when scanning BLE.

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you forgot to use the permission blocks as described here

(Canned Response ABG - Bluetooth non-BLE SCAN Permission Blocks)

These blocks can be dragged into your Blocks Editor to request permission(s) for Bluetooth non-BLE scanning and connecting. All three parts are needed.

You also will need to pull in TinyDB into your project.

to apiLevel result
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when Screen1 .Initialize do
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When Permission Granted (@Patryk)

Thanks to @Anke for the original code.
My changes include

  • use of the Screen1 permission blocks to avoid the possibility of a typo
  • using a TinyDB tag particular to BT permissions and only for BT permissions.

(Thanks to @Patryk for correction to grant order)
Special note for Xiaomi devices:

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And my Android Version is Android 12, I do not know my Bluetooth version :dizzy_face:

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Thank you , I using the latest version of BLE,it should come with its own permissions. But I will try to add TinyDB in my project. Wish me success!

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sorry, I was confused, I posted the blocks for the bluetooth component but you are using BLE...
for BLE see again the answer from @ABG here My app about ble can not work please help me! - #5 by ABG and study the FAQ

Taifun

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Haha It's okay. My latest version is not compatible with my system's Bluetooth so I'll just switch to the previous version. Thank you for your reply.

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Android version and name + manufacturer of your test device?

Try this:

and post screenshots...

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It should be BLE on an Android 12 phone.

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Tank you very much !