BarcodeReaderSample

Barcode Reader

I used google vision api for barcode reader. Can you find basic barcode reader example. I added flash light open and close during when camera preview open.

You would need two permissions Manifest.permission:

This is MainActivity;
-------------------------------------------

public class MainActivity extends Activity{
TextView barcodeResult;

@Override

• protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); barcodeResult = (TextView) findViewById(R.id.barcode_result);

}

public void scanBarcode (View v){
    Intent intent = new Intent(this, ScanBarcodeActivity.class);
    startActivityForResult(intent, 0);

• }

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(requestCode==0){
        if(resultCode== CommonStatusCodes.SUCCESS){
            if(data!=null){
                Barcode barcode = data.getParcelableExtra("barcode");
                barcodeResult.setText("Barcode Value : " + barcode.displayValue);
            }else{
                barcodeResult.setText("No Barcode Found");
            }
        }

    }else
    super.onActivityResult(requestCode, resultCode, data);
}

}

This is ScanBarcodeActivity ;
-------------------------------

public class ScanBarcodeActivity extends Activity implements View.OnClickListener {
SurfaceView cameraPreview;
CameraSource cameraSource;
ImageView flashbtn;
android.hardware.Camera.Parameters params;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_scan_barcode);
    flashbtn = (ImageView) findViewById(R.id.flashbtn);
    flashbtn.setOnClickListener(this);


    cameraPreview = (SurfaceView) findViewById(R.id.camera_preview);
    createCameraSource();

}

@Override
public void onClick(View v) {
    flashOnButton();
}

private Camera camera = null;
boolean flashmode=false;
private void flashOnButton() {
    camera=getCamera(cameraSource);
    if (camera != null) {
        try {
            Camera.Parameters param = camera.getParameters();
            param.setFlashMode(!flashmode?Camera.Parameters.FLASH_MODE_TORCH :Camera.Parameters.FLASH_MODE_OFF);
            camera.setParameters(param);
            flashmode = !flashmode;
            if(flashmode){
                Toast.makeText(this, "Flash Switched ON", Toast.LENGTH_SHORT).show();
            }
            else {
                Toast.makeText(this, "Flash Switched Off", Toast.LENGTH_SHORT).show();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}
private static Camera getCamera(@NonNull CameraSource cameraSource) {
    Field[] declaredFields = CameraSource.class.getDeclaredFields();

    for (Field field : declaredFields) {
        if (field.getType() == Camera.class) {
            field.setAccessible(true);
            try {
                Camera camera = (Camera) field.get(cameraSource);
                if (camera != null) {
                    return camera;
                }
                return null;
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
            break;
        }
    }
    return null;
}

    public void createCameraSource(){

        BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(this).build();
        cameraSource = new CameraSource.Builder(this,barcodeDetector)
                .setRequestedPreviewSize(1600,1024)
                .setFacing(CameraSource.CAMERA_FACING_BACK)
                .setRequestedFps(30.0f)
                .setAutoFocusEnabled(true)
                .build();

        cameraPreview.getHolder().addCallback(new SurfaceHolder.Callback() {

            public static final int REQUEST_PERMISSION_CAMERA = 77;

            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                if(ActivityCompat.checkSelfPermission(ScanBarcodeActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED){
                    ActivityCompat.requestPermissions(ScanBarcodeActivity.this, new String[]{Manifest.permission.CAMERA}, REQUEST_PERMISSION_CAMERA);
                    return;
                }
                try {
                    cameraSource.start(cameraPreview.getHolder());
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
            cameraSource.stop();
            }
        });

        barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
            @Override
            public void release() {

            }

            @Override
            public void receiveDetections(Detector.Detections<Barcode> detections) {
                final SparseArray<Barcode> barcodes = detections.getDetectedItems();
                if(barcodes.size()>0){
                    Intent intent = new Intent();
                    intent.putExtra("barcode",barcodes.valueAt(0)); // son değer
                    setResult(CommonStatusCodes.SUCCESS, intent);
                    finish();
                }


            }
        });
    }

}