
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
Code is working fine. I have not initialized leDeviceListAdapter befor i set it to ListView
1
Popular Android topics

Start building native Android apps the modern way in Kotlin with Jetpack's expansive set of tools, libraries, and best practices. Learn h...
New

I am in the process of research for my next technical blog about bypassing certificate pinning with Frida, thus I need to find some open ...
New

Hi guys, I’m trying to do multi ussd with java on android, I can’t do it.
I looked at the documentation of telephonyManager on android, ...
New

Question: Android Developer
→ is there any way to read the .trash directory?
→ we can copy or save the file before delete ?
#android...
New

Hi,
I made an android app and created a signature with keytool. I then bundled the signature in the apk. So, I was wondering if, wanting...
New

I need to know how to implement outgoing call in my custom application instead of using default phone call app i need my own app call.
New

I am trying to develop an app which will make your smartphone act as a “keyboard”. I need it to send different symbols to another devices...
New

Hello everyone, I recently started learning Kotlin and downloaded Android Studio, but after writing my first code and trying to run it, I...
New

Hey everyone! I’m a senior Android dev with over 5 years of experience. I just launched a website called SocialCode to help developers co...
New

I’m using TensorFlow Lite (TFLite) with React Native Expo. When I test the app using the Expo Go app, everything works fine. However, whe...
New
Other popular topics

Why, if your answer is yes?
New

I’ve been hearing quite a lot of comments relating to the sound of a keyboard, with one of the most desirable of these called ‘thock’, he...
New

Hello content creators! Happy new year. What tech topics do you think will be the focus of 2021? My vote for one topic is ethics in tech...
New

Not sure if following fits exactly this thread, or if we should have a hobby thread…
For many years I’m designing and building model air...
New

If you are experiencing Rails console using 100% CPU on your dev machine, then updating your development and test gems might fix the issu...
New

Woooooooo! This is such a huge release for it, and 2 years incoming!
In short, the library is now using an updated hyper backend (not j...
New

Biggest jackpot ever apparently! :upside_down_face:
I don’t (usually) gamble/play the lottery, but working on a program to predict the...
New

Author Spotlight:
VM Brasseur
@vmbrasseur
We have a treat for you today! We turn the spotlight onto Open Source as we sit down with V...
New

Author Spotlight:
Peter Ullrich
@PJUllrich
Data is at the core of every business, but it is useless if nobody can access and analyze ...
New

This is a very quick guide, you just need to:
Download LM Studio: https://lmstudio.ai/
Click on search
Type DeepSeek, then select the o...
New
Latest in Android
Latest (all)
Categories:
Popular Portals
- /elixir
- /rust
- /wasm
- /ruby
- /erlang
- /phoenix
- /keyboards
- /js
- /rails
- /python
- /security
- /go
- /swift
- /vim
- /clojure
- /haskell
- /java
- /emacs
- /svelte
- /onivim
- /typescript
- /crystal
- /c-plus-plus
- /tailwind
- /kotlin
- /gleam
- /react
- /flutter
- /elm
- /ocaml
- /vscode
- /opensuse
- /centos
- /ash
- /php
- /deepseek
- /scala
- /zig
- /html
- /debian
- /nixos
- /lisp
- /agda
- /textmate
- /sublime-text
- /react-native
- /kubuntu
- /arch-linux
- /revery
- /ubuntu
- /manjaro
- /spring
- /django
- /diversity
- /nodejs
- /lua
- /slackware
- /julia
- /c
- /neovim