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I have integrated ZBar library for QR scanner. But it didn't work perfectly in one of my devices. The camera does not focus automatically on specifically Samsung Galaxy J7+ phone. We have checked in other phones like Motorola, Xiomi, Oneplus and it's working fine.
So can anyone suggest what changes should I make?
Here is my code.

 @Override
 protected void onStart() 
 super.onStart();
 initCamera();
 

 @Override
 protected void onStop() 
 super.onStop();
 releaseCamera();
 

 private void initCamera() 

 autoFocusHandler = new Handler();
 mCamera = getCameraInstance();

 /* Instance barcode scanner */
 scanner = new ImageScanner();
 scanner.setConfig(0, Config.X_DENSITY, 1);
 scanner.setConfig(0, Config.Y_DENSITY, 1);
 scanner.setConfig(0, Config.ENABLE, 0);
 // Only enable the codes your app requires
 scanner.setConfig(Symbol.QRCODE, Config.ENABLE, 1);

 CameraPreview mPreview = new CameraPreview(this, mCamera, previewCb, getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_AUTOFOCUS) ? autoFocusCB : null);

 if (mBinding.preview.getChildCount() > 0) 
 mBinding.preview.removeAllViews();
 
 mBinding.preview.addView(mPreview);
 

 /**
 * A safe way to get an instance of the Camera object.
 */
 public static Camera getCameraInstance() 
 Camera c = null;
 try 
 c = Camera.open();
 catch (Exception e) 
 e.printStackTrace();
 
 return c;
 

 private void releaseCamera() 
 if (mCamera != null) 
 previewing = false;
 mCamera.setPreviewCallback(null);
 mCamera.release();
 mCamera = null;
 
 

 private Runnable doAutoFocus = new Runnable() 
 public void run() 
 if (previewing)
 mCamera.autoFocus(autoFocusCB);
 
 ;

 Camera.PreviewCallback previewCb = new Camera.PreviewCallback() 
 public void onPreviewFrame(byte data, Camera camera) 
 Camera.Parameters parameters = camera.getParameters();
 Camera.Size size = parameters.getPreviewSize();

 Image barcode = new Image(size.width, size.height, "Y800");
 barcode.setData(data);

 int result = scanner.scanImage(barcode);

 if (result != 0) 
 previewing = false;
 mCamera.setPreviewCallback(null);
 mCamera.stopPreview();

 SymbolSet syms = scanner.getResults();
 for (Symbol sym : syms) 
 final String code = sym.getData(); 
 
 
 
 ;

 // Mimic continuous auto-focusing
 Camera.AutoFocusCallback autoFocusCB = new Camera.AutoFocusCallback() 
 public void onAutoFocus(boolean success, Camera camera) 
 autoFocusHandler.postDelayed(doAutoFocus, 1000);
 
 ;