QR code scanner using Zxing library. Scanner for android 

//Scanner activity to scan data and get result. This can be called from other activity and get a result as required.
//You can call scan Activity from any where and get value as reuired and can get type of qr code for example(URI,Text)



public class ScanActivity extends AppCompatActivity implements ZXingScannerView.ResultHandler {








    private static final int REQUEST_CAMERA = 1;



    private static int camId = Camera.CameraInfo.CAMERA_FACING_BACK;



    private ZXingScannerView mScannerView;








    @Override



    protected void onCreate(Bundle savedInstanceState) {



        super.onCreate(savedInstanceState);



        mScannerView = new ZXingScannerView(this);



        setContentView(mScannerView);



        int currentApiVersion = Build.VERSION.SDK_INT;



        if (currentApiVersion >= Build.VERSION_CODES.M) {



            if (checkPermission()) {



                Toast.makeText(getApplicationContext(), "Permission already granted!", Toast.LENGTH_LONG).show();



            } else {



                requestPermission();








            }



        }



    }








    @Override



    public void handleResult(Result result) {



        String type = ResultParser.parseResult(result).getType().toString();



        Log.d("type", type + " " + result.getText());



                Toast.makeText(getApplicationContext(), ResultParser.parseResult(result).getType().toString(), Toast.LENGTH_SHORT).show();



                mScannerView.removeAllViews();



                MainActivity.scannImageData = result.getText();



            }



        }



        finish();



    }








    @Override



    public void onResume() {



        super.onResume();








        int currentapiVersion = android.os.Build.VERSION.SDK_INT;



        if (currentapiVersion >= android.os.Build.VERSION_CODES.M) {



            if (checkPermission()) {



                if (mScannerView == null) {



                    mScannerView = new ZXingScannerView(this);



                }



                setContentView(mScannerView);



                mScannerView.setResultHandler(ScanActivity.this);



                mScannerView.startCamera();



            } else {



                requestPermission();



            }



        }



    }








    private boolean checkPermission() {



        return (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED);



    }








    private void requestPermission() {



        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);



    }








    @Override



    public void onPause() {



        super.onPause();



        mScannerView.stopCamera();           // Stop camera on pause



    }








    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {



        switch (requestCode) {



            case REQUEST_CAMERA:



                if (grantResults.length > 0) {








                    boolean cameraAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;



                    if (cameraAccepted) {



                        Toast.makeText(getApplicationContext(), "Permission Granted, Now you can access camera", Toast.LENGTH_LONG).show();



                    } else {



                        Toast.makeText(getApplicationContext(), "Permission Denied, You cannot access and camera", Toast.LENGTH_LONG).show();



                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {



                            if (shouldShowRequestPermissionRationale(Manifest.permission.CAMERA)) {



                                showMessageOKCancel("You need to allow access to both the permissions",



                                        new DialogInterface.OnClickListener() {



                                            @Override



                                            public void onClick(DialogInterface dialog, int which) {



                                                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {



                                                    requestPermissions(new String[]{Manifest.permission.CAMERA},



                                                            REQUEST_CAMERA);



                                                }



                                            }



                                        });



                                return;



                            }



                        }



                    }



                }



                break;



        }



    }








    private void showMessageOKCancel(String message, DialogInterface.OnClickListener okListener) {



        new android.support.v7.app.AlertDialog.Builder(ScanActivity.this)



                .setMessage(message)



                .setPositiveButton("OK", okListener)



                .setNegativeButton("Cancel", null)



                .create()



                .show();



    }



}








public class MainActivity extends AppCompatActivity{


public static String scannImageurl = "";





@Override



protected void onCreate(Bundle savedInstanceState) {



    super.onCreate(savedInstanceState);



    setContentView(R.layout.activity_main);





    Intent intent = new Intent(this, ScanActivity.class);



    startActivity(intent);




}





@Override



    protected void onResume() {



    



        if (!scannImageurl.equalsIgnoreCase("")) {



            webView.loadUrl(scannImageurl);



            ReloadUrl = mainurl;



            scannImageurl = "";



        }



    }











































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