Styjun

I am working on BLE devices android application. i am trying to get available bluetooth devices using scanCallBack. It was working fine some days ago but suddenly it stopped. onScanResults or onScanFailed nothing are NOT executing. I have given the ACCESS_COARSE_LOCATION, BLUETOOTH_ADMIN, BLUETOOTH and ACCESS_FINE_LOCATION in manifest and request permissions at run time also.Bluetooth is on and location is also on. Please help.

Measurement.java

public class MeasurementScreen extends AppCompatActivity 
private BluetoothAdapter bluetoothAdapter;
static int REQUEST_ENABLE_BT = 1001;
private Boolean spinnerStatus= false;
private Handler handler = new Handler(Looper.getMainLooper());
final BluetoothAdapter mBluetoothAdapter = 
BluetoothAdapter.getDefaultAdapter();
@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.device_reading_screen);
 Objects.requireNonNull(getSupportActionBar()).hide();
 if (Build.VERSION.SDK_INT >= 23) 
 int permissionCheck = ContextCompat.checkSelfPermission(this,
 Manifest.permission.ACCESS_COARSE_LOCATION);
 if (permissionCheck == -1 ) 
 ActivityCompat.requestPermissions(this,
 new String[]
 Manifest.permission.ACCESS_COARSE_LOCATION
 , 0);
 
 
 final Button tryAgain = findViewById(R.id.tryagain);
 next = findViewById(R.id.next);
 back = findViewById(R.id.back);
 progressDialog = new ProgressDialog(this);
 bluetoothscan();

 

 void bluetoothscan()
 spinner();
 scanBLEDevices(true);
 

 private void scanBLEDevices(final boolean enable)
 final BluetoothLeScanner bluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner();

 final BLEScanCallback scanCallback = new BLEScanCallback();
 if (enable)
 // Stops scanning after a pre-defined scan period.
 handler.postDelayed(new Runnable() 
 @Override
 public void run() 
 mScanning = false;
 bluetoothLeScanner.stopScan(scanCallback);
 
 , 10000);

 mScanning = true;
 bluetoothLeScanner.startScan(scanCallback);
 else
 mScanning = false;
 bluetoothLeScanner.stopScan(scanCallback);
 
 


 public class BLEScanCallback extends ScanCallback
 @Override
 public void onScanResult(int callbackType, ScanResult result) 
 super.onScanResult(callbackType, result);
 Log.e("Scan Success", "Scan Success");
 

 @Override
 public void onBatchScanResults(List<ScanResult> results) 
 super.onBatchScanResults(results);
 Log.e("Scan Success", "Scan Success Batch");
 

 @Override
 public void onScanFailed(int errorCode) 
 super.onScanFailed(errorCode);
 Log.e("Scan Failed", "Error Code: " + errorCode);
 
 

This is the log output:-

 D/BluetoothAdapter: STATE_ON
 D/BluetoothLeScanner: onClientRegistered() - status=0 clientIf=6 
 mClientIf=0