Android Bluetooth LE Scanner only scans when phone's Location is turned on in some devices

1 answer

I am building an Android app that advertises small packets of information as well as scan for information using BLE. The code for advertising is:

   AdvertiseSettings advSettings = new AdvertiseSettings.Builder()                 .setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_BALANCED)                 .setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_MEDIUM)                 .setConnectable(false)                 .build();           AdvertiseData advData = new AdvertiseData.Builder()                 .setIncludeTxPowerLevel(true)                 .addServiceUuid(uuid)                 .build();          AdvertiseData advScanResponse = new AdvertiseData.Builder()                 .setIncludeDeviceName(false)                 .addServiceData(uuid,"1234567890".getBytes( Charset.forName( "UTF-8" ) ))                 .build();          AdvertiseCallback advCallback = new AdvertiseCallback() {             String TAG="status";              @Override             public void onStartFailure(int errorCode) {                 super.onStartFailure(errorCode);                 Log.e(TAG, "Not broadcasting: " + errorCode);                 int statusText;                 switch (errorCode) {                     case ADVERTISE_FAILED_ALREADY_STARTED:                         Log.w(TAG, "ADVERTISE_FAILED_ALREADY_STARTED");                         break;                     case ADVERTISE_FAILED_DATA_TOO_LARGE:                         Log.w(TAG, "ADVERTISE_FAILED_DATA_TOO_LARGE");                         break;                     case ADVERTISE_FAILED_FEATURE_UNSUPPORTED:                         Log.w(TAG, "ADVERTISE_FAILED_FEATURE_UNSUPPORTED");                         break;                     case ADVERTISE_FAILED_INTERNAL_ERROR:                         Log.w(TAG, "ADVERTISE_FAILED_INTERNAL_ERROR");                         break;                     case ADVERTISE_FAILED_TOO_MANY_ADVERTISERS:                         Log.w(TAG, "ADVERTISE_FAILED_TOO_MANY_ADVERTISERS");                         break;                     default:                         Log.wtf(TAG, "Unhandled error: " + errorCode);                 }                 Toast.makeText(MainActivity.this, "Failed", Toast.LENGTH_SHORT).show();             }              @Override             public void onStartSuccess(AdvertiseSettings settingsInEffect) {                 super.onStartSuccess(settingsInEffect);                 Log.v(TAG, "Advertising started");                 mText.setText(uuid.toString());                 Toast.makeText(MainActivity.this, "Started", Toast.LENGTH_SHORT).show();             }         };          mBluetoothAdapter.getBluetoothLeAdvertiser()                 .startAdvertising(advSettings, advData, advScanResponse, advCallback); 

and the code for listening is as follows:

mBluetoothLeScanner=mBluetoothAdapter.getBluetoothLeScanner();       ScanCallback mScanCallback = new ScanCallback() {         @Override         public void onScanResult(int callbackType, ScanResult result) {             super.onScanResult(callbackType, result);             if( result == null                     || result.getDevice() == null                      )                 return;              if(result.getScanRecord().getServiceUuids()!=null) {                  ParcelUuid pp=result.getScanRecord().getServiceUuids().get(0);                  StringBuilder builder = new StringBuilder((pp.toString()+"\n"));                  builder.append(new String (result.getScanRecord().getServiceUuids().size()+""));                  mText.setText(builder.toString());             } 

I have tested it on multiple phones and it works fine. However, Android version 9.0 on Galaxy S8+ can't scan unless the location is turned on. I also tried in on Android version 9.0 on Redmi Note 7 and it works perfectly without the need of turning on the location. What is causing my problem?

All answers to this question, which has the identifier 61239306

The best answer:

Not sure about the Android settings on the Redmi Note 7, but for Android 9 devices ACCESS_COARSE_LOCATION needs to be turned on in order for Bluetooth to function. Maybe this is somehow turned on on the Redmi Note 7 regardless of the location settings, whereas on the S8+ this is tied to the location settings.

You can find more information here:-

https://stackoverflow.com/a/58232014/2215147

I hope this helps.

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