can not find BLE device under Android 6.0

[shalongbasi1]

ElfApp.zipThis attached application is based on Nrf_uart demo app.

It works fine under Android 5.0 and 4.4 smartphone. When I click the connect button, it shows the info of an BLE device, but under Android 6.0, it continuously scans and cannot find anything. but Nrf_uart 2.0 app in google play store can find BLE device under same 6.0 smartphone. I compared codes with demo app nRF_UART regarding devicelisting activity and can not find any difference. Anyone could help? Thanks a lot

[Hung Bui]

Hi Shalong,

According to this and this, if you target at SDK 23 or higher, you would need to request permission if the app needed. And as in the link, the permission to do BLE scanning is location.

So the solution is either change your SDK target in the build.gradle to lower than 23 (in NRF UART v2.0 it's 18) or you need to add location permission in your app (in the ..manifest.xml)

[shalongbasi1]

Thanks for helping me tested on your Android 6.0. After the research, I found I missed the step "sync gradle" after changing the target SDK version. Now the program works on my MotoG android 6.0 too. :D. thanks for help again.