Полагаю, в вашем коде нет onActivityResult, и поэтому вы не можете захватить и вернуть какой-либо результат.
Итак, я прилагаю свою работу, и это поможет вам.
cameraView = (SurfaceView) v.findViewById(R.id.cameraView);
textResult = (TextView) v.findViewById(R.id.textView);
barcodeDetector = new BarcodeDetector.Builder(v.getContext())
.setBarcodeFormats(Barcode.QR_CODE)
.build();
cameraSource = new CameraSource.Builder(v.getContext(), barcodeDetector)
.setRequestedPreviewSize(640, 640).build();
cameraView.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (ActivityCompat.checkSelfPermission(v.getContext(), android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
//Request permission
ActivityCompat.requestPermissions(getActivity(),
new String[]{android.Manifest.permission.CAMERA}, RequestCameraPermissionID);
return;
}
try {
cameraSource.start(cameraView.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
cameraSource.stop();
}
});
barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
@Override
public void release() {
}
@Override
public void receiveDetections(Detector.Detections<Barcode> detections) {
final SparseArray<Barcode> qrcodes = detections.getDetectedItems();
if (qrcodes.size() != 0) {
textResult.post(new Runnable() {
@Override
public void run() {
//Create vibrate
Vibrator vibrator = (Vibrator) getContext().getSystemService(Context.VIBRATOR_SERVICE);
vibrator.vibrate(1000);
textResult.setText(qrcodes.valueAt(0).displayValue);
showResultDialogue(qrcodes.valueAt(0).displayValue);
}
});
}//End if Statement
}
});
Вот onActivityResult, и я думаю, что у вас его нет.
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
//We will get scan results here
IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
//check for null
if (result != null) {
if (result.getContents() == null) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(getContext());
alertDialog.setTitle("Error");
alertDialog.setMessage("Scanning Error. Please try Again");
alertDialog.show();
} else {
//show dialogue with result
showResultDialogue(result.getContents());
}
} else {
// This is important, otherwise the result will not be passed to the fragment
super.onActivityResult(requestCode, resultCode, data);
}
}
//method to construct dialogue with scan results
public void showResultDialogue(final String result) {
final AlertDialog.Builder builder;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
builder = new AlertDialog.Builder(getContext(), android.R.style.Theme_Material_Dialog_Alert);
} else {
builder = new AlertDialog.Builder(getContext());
}
//If the text of QR Code is success then Check-in Successful.
//if(result.equalsIgnoreCase("success")){
//Stop the scanner
barcodeDetector.release();
builder.setTitle("Successfully Scan QR Code")
.setMessage("Result ---> " + result)
.setPositiveButton("DONE", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(getContext(), MainActivity.class);
startActivity(intent);
//Click ok and Back to Main Page
}
}).create().show();