how to show bar-code scanning screen always?

Question

How to show bar-code scanning screen always in android.

IntentIntegrator integrator = new IntentIntegrator(activity);   

Answer 1

first you need to add a FrameLayout to your layout.xml as a container for barcodeScannet :

<FrameLayout
        android:id="@+id/barcode_scanner"
        android:layout_width="match_parent"
        android:layout_height="350dp" />

after that you need to implement ZXingScannerView.ResultHandler in your activity or fragment

then you need to add scanner to this view

private ZXingScannerView mScannerView;

ViewGroup v = (ViewGroup) mainView.findViewById(R.id.barcode_scanner);
mScannerView = new ZXingScannerView(getActivity());
    v.addView(mScannerView);

also you need to override onResume and onPause to start stop the camera:

@Override
public void onResume() {
    super.onResume();
    mScannerView.setResultHandler(this); // Register ourselves as a handler for scan results.
// aslso check for camera permission here too
}

@Override
public void onPause() {
    mScannerView.stopCamera();           // Stop camera on pause
    super.onPause();
}

then :

@Override
public void handleResult(Result rawResult) {

    AppLog.logE("result content", rawResult.getText()); // Prints scan results
    AppLog.logE("result name", rawResult.getBarcodeFormat().toString()); // Prints the scan format (qrcode, pdf417 etc.)

   // the resault of barcode will be given as an string rawResult.getText()
   // and you can do whatEver you want with it
   // handleBarcodeResult(rawResult.getText());

    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            mScannerView.resumeCameraPreview(BillPaymentFragment.this);
        }
    }, 2000);
}

and finally whenever you want to start the barcode scanner just call the following code :

mScannerView.startCamera();