BluetoothLeGatt sample, missing ACCESS_FINE_LOCATION?

[divjad---]

In the BluetoothLeGatt sample, I am unable to see any BLE devices after the initial scan. I ran the sample on OnePlus 5T running API version 29. I had tried to run this sample with added permission ACCESS_FINE_LOCATION and after the scan, I have seen a list of available devices. I propose for this permission to be added to the Manifest and to be correctly asked for at the app launch.

[EbenezerGH]

Thanks @divjad---

[khuranakaran]

@divjad--- pls list all the new permissions you added, because with original code, I'm unable to detect available devices.

[khuranakaran]

First add this library by google: implementation 'pub.devrel:easypermissions:3.0.0'

Then Add these lines to add location permission :

private final int REQUEST_LOCATION_PERMISSION = 1;

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    // Forward results to EasyPermissions
    EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
}

@AfterPermissionGranted(REQUEST_LOCATION_PERMISSION)
public void requestLocationPermission() {
    String[] perms = {Manifest.permission.ACCESS_FINE_LOCATION};
    if(EasyPermissions.hasPermissions(this, perms)) {
        Toast.makeText(this, "Permission already granted", Toast.LENGTH_SHORT).show();
    }
    else {
        EasyPermissions.requestPermissions(this, "Please grant the location permission", REQUEST_LOCATION_PERMISSION, perms);
    }
}

[sgrue]

Guys, I just built that project and tried to get it work, but unfortunately, even with the changes posted by khuranakaran 20h ago, I don't see any BT devices. Could you probably post the file...or send me the entire code or project?

I'm testing with a Google Pixel (1) with Android 10, Oneplus One with Android 10 and a Oneplus 7T with Android 10.... :-(

[khuranakaran]

what permissions you are using ??

[khuranakaran]

I'm also working on same bluetooth connect, as soon as i have a proper working code, I'll post .

[sgrue]

what permissions you are using ??

At the moment the following should work, according to google's code samples, but it doesn't:

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

[divjad---]

I have just added ACCESS_FINE_LOCATION and asked for it normally as in here https://developer.android.com/training/permissions/requesting without using any external library.

[khuranakaran]

Have you asked permissions at run time ??

[divjad---]

Yes, I have asked for permission at runtime.

[sgrue]

Maybe a stupid question, but which devices should then be listed, only BLE devices, or e.g. when I run the app on my pixel, should I then see also my Oneplus One and 7T, or only a e.g. BLE device like a Heart Rate or a Temperature sensor?

My aim is to see my Xiaomi Mi Band4 and get the Heart Rate data...

[khuranakaran]

This will show Classic Bluetooth devices only

[sgrue]

This will show Classic Bluetooth devices only

Well, then I should see all my discoverable devices (notebook, smartphones, speakers,...) which I don't.

@divjad--- Could you send me your apk and/or source? Just to see if that's doing the job also on my side...

[khuranakaran]

Add these lines as well, to turn on GPS as well without it your bluetooth won't detect nearby devices.

protected void createLocationRequest() { LocationRequest locationRequest = LocationRequest.create(); locationRequest.setInterval(10000); locationRequest.setFastestInterval(5000); locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

    LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
            .addLocationRequest(locationRequest);

    SettingsClient client = LocationServices.getSettingsClient(this);
    Task<LocationSettingsResponse> task = client.checkLocationSettings(builder.build());



    task.addOnSuccessListener(this, new OnSuccessListener<LocationSettingsResponse>() {
        @Override
        public void onSuccess(LocationSettingsResponse locationSettingsResponse) {
            // All location settings are satisfied. The client can initialize
            // location requests here.
            // ...

            Toast.makeText(MainActivity2.this, "Gps already open",
                    Toast.LENGTH_LONG).show();
            Log.d("location settings",locationSettingsResponse.toString());
        }
    });

    task.addOnFailureListener(this, new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            if (e instanceof ResolvableApiException) {
                // Location settings are not satisfied, but this can be fixed
                // by showing the user a dialog.
                try {
                    // Show the dialog by calling startResolutionForResult(),
                    // and check the result in onActivityResult().
                    ResolvableApiException resolvable = (ResolvableApiException) e;
                    resolvable.startResolutionForResult(MainActivity2.this,
                            11);
                } catch (IntentSender.SendIntentException sendEx) {
                    // Ignore the error.
                }
            }
        }
    });
}


@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if(requestCode==11){

        if(resultCode==RESULT_OK){

            Toast.makeText(this, "Gps opened", Toast.LENGTH_SHORT).show();
            //if user allows to open gps
            Log.d("result ok",data.toString());

        }else if(resultCode==RESULT_CANCELED){

            Toast.makeText(this, "refused to open gps",
                    Toast.LENGTH_SHORT).show();
            // in case user back press or refuses to open gps
            Log.d("result cancelled",data.toString());
        }
    }
}

[sgrue]

thanks for the code @khuranakaran - I inserted it with some adaptions, but still it doesn't see any BT devices.