Creator

Creator

By debbuging after @RequiresBluetoothLocationPermission annotation program will exit function startScan in BluetoothLeScanner object

Could you please help me to find the problem why startScan function is not executed. By debugging after @RequiresBluetoothLocationPermission program will not go the next line.

My phone is Samsung Galaxy S22 Ultra Anfroid14, Compile Target SDK 34
Location, Connect, Scan - Permissions will be grandet at Run time This is a function that should be executed with provided ScanCallback

@RequiresLegacyBluetoothAdminPermission
@RequiresBluetoothScanPermission
**@RequiresBluetoothLocationPermission**
@RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
public void startScan(final ScanCallback callback) {
    startScan(null, new ScanSettings.Builder().build(), callback);
}

My program Code:

package com.example.navigationleftexample.ui.gallery;

import android.Manifest;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.bluetooth.le.BluetoothLeScanner;
import android.bluetooth.le.ScanCallback;
import android.bluetooth.le.ScanResult;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CompoundButton;
import android.widget.ListView;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;


import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.ListFragment;
import androidx.lifecycle.ViewModelProvider;

import android.os.*;

import com.example.navigationleftexample.MainActivity;
import com.example.navigationleftexample.R;
import com.example.navigationleftexample.databinding.FragmentBluetoothBinding;
import com.example.navigationleftexample.ui.Bluetooth.LeDeviceListAdapter;

import pub.devrel.easypermissions.EasyPermissions;


public class BluetoothFragment extends Fragment {
Switch bluetoothSwitch;
private FragmentBluetoothBinding binding;
private BluetoothAdapter mBluetoothAdapter;

private LayoutInflater layoutInflater;
private BluetoothLeScanner bluetoothLeScanner;


private boolean scanning;
private Handler handler = new Handler();

public static final String[] BLUETOOTH_PERMISSIONS_S = 
{ Manifest.permission.BLUETOOTH_SCAN,     Manifest.permission.BLUETOOTH_CONNECT} ;


private static final int PERMISSION_REQUEST_COARSE_LOCATION = 456;

private static final int REQUEST_CODE_BLUETOOTH_SCAN = 1;

// Stops scanning after 10 seconds.
private static final long SCAN_PERIOD = 10000;



//LeDeviceListAdapter leDeviceListAdapter = new LeDeviceListAdapter(layoutInflater);
LeDeviceListAdapter leDeviceListAdapter;



private boolean checkPermission() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
        int permission = ContextCompat.checkSelfPermission
 (getContext(),   Manifest.permission.ACCESS_FINE_LOCATION);
        return permission == PackageManager.PERMISSION_GRANTED;
    }else{
        return true;
    }
}
            // Device scan callback.
private ScanCallback leScanCallback =
        new ScanCallback() {
            @Override
            public void onScanResult(int callbackType, ScanResult result) {
                super.onScanResult(callbackType, result);
                leDeviceListAdapter.addDevice(result.getDevice());
                leDeviceListAdapter.notifyDataSetChanged();
            }
        };


private void scanLeDevice() {
    if (!scanning) {
        // Stops scanning after a predefined scan period.
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                scanning = false;
                if (ActivityCompat.checkSelfPermission(getContext(),
         Manifest.permission.BLUETOOTH_SCAN) 
!= PackageManager.PERMISSION_GRANTED) {
                    // TODO: Consider calling
                    //    ActivityCompat#requestPermissions
                    // here to request the missing permissions, and then overriding
                    //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                    //                                          int[] grantResults)
                    // to handle the case where the user grants the permission. See the documentation
                    // for ActivityCompat#requestPermissions for more details.
                    return;
                }
                bluetoothLeScanner.stopScan(leScanCallback);
            }
        }, SCAN_PERIOD);

        scanning = true;
        bluetoothLeScanner.startScan(leScanCallback);
    } else {
        scanning = false;
        //bluetoothLeScanner.stopScan(leScanCallback);
        scanLeDevice();
    }
}




public View onCreateView(@NonNull LayoutInflater inflater,
                         ViewGroup container, Bundle savedInstanceState) {
    BluetoothViewModel bluetoothViewModel =
            new ViewModelProvider(this).get(BluetoothViewModel.class);


    // Initializes a Bluetooth adapter.  For API level 18 and above, get a reference to
    // BluetoothAdapter through BluetoothManager.
    final BluetoothManager bluetoothManager =
            (BluetoothManager) getContext().getSystemService(Context.BLUETOOTH_SERVICE);
    mBluetoothAdapter = bluetoothManager.getAdapter();




    // Checks if Bluetooth is supported on the device.
    if (mBluetoothAdapter == null) {
        Toast.makeText(getContext(), R.string.ble_not_supported, Toast.LENGTH_SHORT).show();
        getActivity().finish();

    }
    bluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner();

    layoutInflater = inflater;

    binding = FragmentBluetoothBinding.inflate(inflater, container, false);
    View root = binding.getRoot();


    // Check Bluetooth Switch
    bluetoothSwitch = (Switch) binding.switchBluetoothOn;
    bluetoothSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            Toast.makeText(root.getContext(), "Bluetooth was changed", Toast.LENGTH_SHORT).show();
            if (isChecked==true)
            {

                // Use this check to determine whether BLE is supported on the device.  Then you can
                // selectively disable BLE-related features.
                if   (!getActivity().getPackageManager().
hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
                    Toast.makeText(getContext(), 
R.string.ble_not_supported,   Toast.LENGTH_SHORT).show();
                    getActivity().finish();
                }


                //  Check permissions for Bluetooth Connect
                if (ContextCompat.checkSelfPermission(getContext(), 
 Manifest.permission.BLUETOOTH_CONNECT) 
 == PackageManager.PERMISSION_DENIED)
                {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S)
                    {
                        ActivityCompat.requestPermissions(getActivity(), 
new String[] {Manifest.permission.BLUETOOTH_CONNECT}, 2);
                        return;
                    }
                }
                // Request Scan permission
                ActivityCompat.requestPermissions(getActivity(), 
new String[] 
{Manifest.permission.BLUETOOTH_SCAN}, REQUEST_CODE_BLUETOOTH_SCAN);



                boolean fineLocation = checkPermission();


                leDeviceListAdapter = new LeDeviceListAdapter(layoutInflater);
                scanLeDevice();
            }
            else
            {
                leDeviceListAdapter.clear();
                //scanLeDevice(false);
            }
        }
    });

    //  Show Connected Bluetooth Device
    final TextView textView = binding.textViewBluetoothDeviceChosen;
    bluetoothViewModel.getText().observe(getViewLifecycleOwner(), textView::setText);

    // Show List of Bluetooth scanned devices
    final ListView listView = (ListView) binding.listBluetoothDeviceView;
    //String [] deviceArray = bluetoothViewModel.getDeviceArray();





    listView.setAdapter(leDeviceListAdapter);

    // Create Listener for the List
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            final String item = (String) parent.getItemAtPosition(position);
            Toast.makeText(root.getContext(), "You have selected item: " + item,  
  Toast.LENGTH_SHORT).show();


        }
    });



    return root;
}

@Override
public void onAttach(@NonNull Context context) {
    super.onAttach(context);
    ActivityResultLauncher<String[]> locationPermissionRequest =
            registerForActivityResult(new ActivityResultContracts
                            .RequestMultiplePermissions(), result -> {
                        Boolean fineLocationGranted = result.getOrDefault(
                                Manifest.permission.ACCESS_FINE_LOCATION, false);
                        Boolean coarseLocationGranted = result.getOrDefault(
                                Manifest.permission.ACCESS_COARSE_LOCATION,false);
                        if (fineLocationGranted != null && fineLocationGranted) {
                            // Precise location access granted.
                            Toast.makeText(getContext(), "Precise location granted" ,  
 Toast.LENGTH_SHORT).show();
                        } else if (coarseLocationGranted != null && coarseLocationGranted) {
                            // Only approximate location access granted.
                            Toast.makeText(getContext(), "Aproximate location granted" , 
 Toast.LENGTH_SHORT).show();
                        } else {
                            // No location access granted.
                            Toast.makeText(getContext(), "No location granted" , 
 Toast.LENGTH_SHORT).show();
                        }
                    }
            );

    locationPermissionRequest.launch(new String[] {
            Manifest.permission.ACCESS_FINE_LOCATION,
            Manifest.permission.ACCESS_COARSE_LOCATION
    });
}

@Override
public void onDestroyView() {
    super.onDestroyView();
    binding = null;
}


}

Permissions from Android manifest:

<uses-permission android:name="android.permission.BLUETOOTH_SCAN"/>


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



<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

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


<uses-feature android:name="android.hardware.bluetooth_le" />



<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

<uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="30" />


<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />

<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<uses-permission android:name="android.permission.USE_FULL_SCREEN_INTENT" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.BILLING" />

Most Liked

Creator

Creator

Code is working fine. I have not initialized leDeviceListAdapter befor i set it to ListView

Where Next?

Popular Android topics Top

big_f
I am making an app with Nativescript-vue and I would like to have an event where I click on an icon and then a new box appears. For the i...
New
CristianM92
Hi, I’m working on an app who make the conversion between decimal degrees and degrees minutes seconds. I have to make an “Export” button ...
New
Tuk-tuk
Hello! I’m learning Android Jetpack compose development from tutorials and documentation by Android developers. And I ran into a problem…...
New
mfaamir
Dear Sir, I am a beginner in Android App development and I am currently trying to establish a connection between my Android Studio Java ...
New
faust
Honest question, do companies still use Java for their new android apps? I thought everybody was using Kotlin these days.
New
Briannamari
Old android photo name sequence Help decoding file names Example. I want to see if a file name aligns with a time / date in which the p...
New
sabibo
We recently switched some machines to a network that uses ipV6. Those machines are now unable to package our Unreal game for Android, du...
New
Ujjwala
I’m developing an Android application in which I need to add functionality to automatically read a CSV file from a file manager, parse it...
New
Garrett
This is a question about Android Studio. Where is the Android Studio emulator’s camera default apartment 3D model stored in Android Stud...
New
auroralane7754
Hey developers :waving_hand: I’m currently experimenting with various mobile VPN apps to simulate different network conditions for API t...
New

Other popular topics Top

PragmaticBookshelf
Design and develop sophisticated 2D games that are as much fun to make as they are to play. From particle effects and pathfinding to soci...
New
AstonJ
SpaceVim seems to be gaining in features and popularity and I just wondered how it compares with SpaceMacs in 2020 - anyone have any thou...
New
AstonJ
Curious to know which languages and frameworks you’re all thinking about learning next :upside_down_face: Perhaps if there’s enough peop...
New
AstonJ
I have seen the keycaps I want - they are due for a group-buy this week but won’t be delivered until October next year!!! :rofl: The Ser...
New
AstonJ
If you get Can't find emacs in your PATH when trying to install Doom Emacs on your Mac you… just… need to install Emacs first! :lol: bre...
New
Help
I am trying to crate a game for the Nintendo switch, I wanted to use Java as I am comfortable with that programming language. Can you use...
New
First poster: AstonJ
Jan | Rethink the Computer. Jan turns your computer into an AI machine by running LLMs locally on your computer. It’s a privacy-focus, l...
New
PragmaticBookshelf
Develop, deploy, and debug BEAM applications using BEAMOps: a new paradigm that focuses on scalability, fault tolerance, and owning each ...
New
CommunityNews
A Brief Review of the Minisforum V3 AMD Tablet. Update: I have created an awesome-minisforum-v3 GitHub repository to list information fo...
New
RobertRichards
Hair Salon Games for Girls Fun Girls Hair Saloon game is mainly developed for kids. This game allows users to select virtual avatars to ...
New