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

Popular Android topics Top

PragmaticBookshelf
Programmers don't just use Kotlin, they love it. Even Google has adopted it as a first-class language for Android development. With Kotli...
New
Exadra37
Even so, Mr Hall acknowledged that some of the privacy changes could prove timely. They include: the ability to give apps single-use -...
New
Joakins
Android studio displayed access is denied during gradle build C:\Program Files\Java\jdk1.8.0_251\native\68d5fa5c4cc2d200863cafc0d521ce42...
New
Shadow
Good afternoon. Brief story: My institution has several nfc tags in building which have to be scanned with specific app built and used in...
New
cve60069
Hello I am starting the tearning curve to writing an app for my galaxy phone. Me and my friens play a lot of “Texas Hold-Em” and, for t...
New
freerefills
I have an android app whereby notifications will fire and immediately leave the tray. This doesn’t always happen, it’s unpredictable they...
New
JesperBlom
Hi Hope it is a simple question :slight_smile: I am planning to use a new PC for making my enterprise app. Everything works perfect, b...
New
tsellami
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
AnfaengerAlex
Hello, I’m a beginner in Android development and I’m facing an issue with my project setup. In my build.gradle.kts file, I have the foll...
New
skysnap
Helo, I’m using doubleviewpager in my project: Is there something similar that works with android x?
New

Other popular topics Top

AstonJ
If it’s a mechanical keyboard, which switches do you have? Would you recommend it? Why? What will your next keyboard be? Pics always w...
New
brentjanderson
Bought the Moonlander mechanical keyboard. Cherry Brown MX switches. Arms and wrists have been hurting enough that it’s time I did someth...
New
AstonJ
You might be thinking we should just ask who’s not using VSCode :joy: however there are some new additions in the space that might give V...
New
PragmaticBookshelf
“Finding the Boundaries” Hero’s Journey with Noel Rappin @noelrappin Even when you’re ultimately right about what the future ho...
New
AstonJ
Seems like a lot of people caught it - just wondered whether any of you did? As far as I know I didn’t, but it wouldn’t surprise me if I...
New
mafinar
Crystal recently reached version 1. I had been following it for awhile but never got to really learn it. Most languages I picked up out o...
New
New
New
husaindevelop
Inside our android webview app, we are trying to paste the copied content from another app eg (notes) using navigator.clipboard.readtext ...
New
PragmaticBookshelf
Author Spotlight: Karl Stolley @karlstolley Logic! Rhetoric! Prag! Wow, what a combination. In this spotlight, we sit down with Karl ...
New

Latest in Android

View all threads ❯