Getting callback of barcodeScannerView again in decodeSingle on destroy of the Activity

[bakar517]

Description of the problem:

I just modify CustomScannerActivity class of sample project according to my requirement. On getting the result of QR code I showed a progressDialog and finish the Activity after 3 seconds of that but on destroy of activity, I'm getting callback of barcodeScannerView again. How can I stop callback after getting one?

Here is the modified code.

public class CustomScannerActivity extends Activity implements
        DecoratedBarcodeView.TorchListener, BarcodeCallback {

    private CaptureManager capture;
    private DecoratedBarcodeView barcodeScannerView;
    private Button switchFlashlightButton;
    private ViewfinderView viewfinderView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_custom_scanner);
        handler = new Handler();
        barcodeScannerView = (DecoratedBarcodeView) findViewById(R.id.zxing_barcode_scanner);
        barcodeScannerView.setTorchListener(this);

        switchFlashlightButton = (Button) findViewById(R.id.switch_flashlight);

        viewfinderView = (ViewfinderView) findViewById(R.id.zxing_viewfinder_view);

        // if the device does not have flashlight in its camera,
        // then remove the switch flashlight button...
        if (!hasFlash()) {
            switchFlashlightButton.setVisibility(View.GONE);
        }

        capture = new CaptureManager(this, barcodeScannerView);
//        capture.initializeFromIntent(getIntent(), savedInstanceState);
//        capture.decode();

        barcodeScannerView.decodeSingle(this);

        changeMaskColor(null);
    }

    @Override
    protected void onResume() {
        super.onResume();
        capture.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
        capture.onPause();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        capture.onDestroy();
        hideProgressBar();

        Log.v("LogTrack", "onDestroy");

    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        capture.onSaveInstanceState(outState);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        return barcodeScannerView.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
    }

    /**
     * Check if the device's camera has a Flashlight.
     *
     * @return true if there is Flashlight, otherwise false.
     */
    private boolean hasFlash() {
        return getApplicationContext().getPackageManager()
                .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
    }

    public void switchFlashlight(View view) {
        if (getString(R.string.turn_on_flashlight).equals(switchFlashlightButton.getText())) {
            barcodeScannerView.setTorchOn();
        } else {
            barcodeScannerView.setTorchOff();
        }
    }

    public void changeMaskColor(View view) {
        Random rnd = new Random();
        int color = Color.argb(100, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
        viewfinderView.setMaskColor(color);
    }

    @Override
    public void onTorchOn() {
        switchFlashlightButton.setText(R.string.turn_off_flashlight);
    }

    @Override
    public void onTorchOff() {
        switchFlashlightButton.setText(R.string.turn_on_flashlight);
    }

    private Handler handler;
    @Override
    public void barcodeResult(BarcodeResult result) {
        Log.v("LogTrack", "barcodeResult");
        if (result != null) {
            Log.v("LogTrack", "result = " + result.getResult().toString());
            try{
                showProgressBar(result.getResult().toString());
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        finish();
                    }
                }, 3000);

            }catch (Exception e){
                Log.v("LogTrack", "e = " + e.getMessage());
                e.printStackTrace();
            }
        }


    }

    @Override
    public void possibleResultPoints(List<ResultPoint> resultPoints) {

    }

    private ProgressDialog progressDialog;

    public void showProgressBar(String text) {
        if (!isFinishing()){
            progressDialog = ProgressDialog.show(this, "", text, false, false);
        }
    }

    public void hideProgressBar() {
        if (!isFinishing()) {
            if (progressDialog != null && progressDialog.isShowing()) { progressDialog.dismiss(); }
        }
    }
}