ScannerActivity

public class ScannerActivity extends BaseScannerActivity implements
        ZXingScannerView.ResultHandler, FormatSelectorDialogFragment.FormatSelectorDialogListener,
        CameraSelectorDialogFragment.CameraSelectorDialogListener {

    private static final String FLASH_STATE = "FLASH_STATE";
    private static final String AUTO_FOCUS_STATE = "AUTO_FOCUS_STATE";
    private static final String SELECTED_FORMATS = "SELECTED_FORMATS";
    private static final String CAMERA_ID = "CAMERA_ID";
    private ZXingScannerView mScannerView;
    private boolean mFlash;
    private boolean mAutoFocus;
    private ArrayList<Integer> mSelectedIndices;
    private int mCameraId = -1;

    private Button buttonNextScan;
    private Activity activity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scanner);
        setTitle("BARCODE SCANNER");

        if (savedInstanceState != null) {
            mFlash = savedInstanceState.getBoolean(FLASH_STATE, false);
            mAutoFocus = savedInstanceState.getBoolean(AUTO_FOCUS_STATE, true);
            mSelectedIndices = savedInstanceState.getIntegerArrayList(SELECTED_FORMATS);
            mCameraId = savedInstanceState.getInt(CAMERA_ID, -1);
        } else {
            mFlash = false;
            mAutoFocus = true;
            mSelectedIndices = null;
            mCameraId = -1;
        }

        setupToolbar();
        buttonNextScan = findViewById(R.id.buttonNextScan);
        activity = ScannerActivity.this;

        ViewGroup contentFrame = (ViewGroup) findViewById(R.id.content_frame);
        mScannerView = new ZXingScannerView(this);
        setupFormats();
        contentFrame.addView(mScannerView);
    }

    @Override
    protected void onResume() {
        super.onResume();
        mScannerView.setResultHandler(this);
        mScannerView.startCamera(mCameraId);
        mScannerView.setFlash(mFlash);
        mScannerView.setAutoFocus(mAutoFocus);
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putBoolean(FLASH_STATE, mFlash);
        outState.putBoolean(AUTO_FOCUS_STATE, mAutoFocus);
        outState.putIntegerArrayList(SELECTED_FORMATS, mSelectedIndices);
        outState.putInt(CAMERA_ID, mCameraId);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuItem menuItem;

        if (mFlash) {
            menuItem = menu.add(Menu.NONE, R.id.menu_flash, 0, R.string.flash_on);
        } else {
            menuItem = menu.add(Menu.NONE, R.id.menu_flash, 0, R.string.flash_off);
        }
        MenuItemCompat.setShowAsAction(menuItem, MenuItem.SHOW_AS_ACTION_NEVER);


        if (mAutoFocus) {
            menuItem = menu.add(Menu.NONE, R.id.menu_auto_focus, 0, R.string.auto_focus_on);
        } else {
            menuItem = menu.add(Menu.NONE, R.id.menu_auto_focus, 0, R.string.auto_focus_off);
        }
        MenuItemCompat.setShowAsAction(menuItem, MenuItem.SHOW_AS_ACTION_NEVER);

        menuItem = menu.add(Menu.NONE, R.id.menu_formats, 0, R.string.formats);
        MenuItemCompat.setShowAsAction(menuItem, MenuItem.SHOW_AS_ACTION_NEVER);

        menuItem = menu.add(Menu.NONE, R.id.menu_camera_selector, 0, R.string.select_camera);
        MenuItemCompat.setShowAsAction(menuItem, MenuItem.SHOW_AS_ACTION_NEVER);

        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle presses on the action bar items
        switch (item.getItemId()) {
            case R.id.menu_flash:
                mFlash = !mFlash;
                if (mFlash) {
                    item.setTitle(R.string.flash_on);
                } else {
                    item.setTitle(R.string.flash_off);
                }
                mScannerView.setFlash(mFlash);
                return true;
            case R.id.menu_auto_focus:
                mAutoFocus = !mAutoFocus;
                if (mAutoFocus) {
                    item.setTitle(R.string.auto_focus_on);
                } else {
                    item.setTitle(R.string.auto_focus_off);
                }
                mScannerView.setAutoFocus(mAutoFocus);
                return true;
            case R.id.menu_formats:
                DialogFragment fragment = FormatSelectorDialogFragment.newInstance(this, mSelectedIndices);
                fragment.show(getSupportFragmentManager(), "format_selector");
                return true;
            case R.id.menu_camera_selector:
                mScannerView.stopCamera();
                DialogFragment cFragment = CameraSelectorDialogFragment.newInstance(this, mCameraId);
                cFragment.show(getSupportFragmentManager(), "camera_selector");
                return true;

            case android.R.id.home:
                onBackPressed();
                return true;

            default:
                return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public void handleResult(Result rawResult) {
        //isi coding kebutuhan kita
    }

    public void closeMessageDialog() {
        closeDialog("scan_results");
    }

    public void closeFormatsDialog() {
        closeDialog("format_selector");
    }

    public void closeDialog(String dialogName) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        DialogFragment fragment = (DialogFragment) fragmentManager.findFragmentByTag(dialogName);
        if (fragment != null) {
            fragment.dismiss();
        }
    }

    public void resume(View view) {
        mScannerView.resumeCameraPreview(this);
        buttonNextScan.setVisibility(View.GONE);
    }

    @Override
    public void onFormatsSaved(ArrayList<Integer> selectedIndices) {
        mSelectedIndices = selectedIndices;
        setupFormats();
    }

    @Override
    public void onCameraSelected(int cameraId) {
        mCameraId = cameraId;
        mScannerView.startCamera(mCameraId);
        mScannerView.setFlash(mFlash);
        mScannerView.setAutoFocus(mAutoFocus);
    }

    public void setupFormats() {
        List<BarcodeFormat> formats = new ArrayList<BarcodeFormat>();
        if (mSelectedIndices == null || mSelectedIndices.isEmpty()) {
            mSelectedIndices = new ArrayList<Integer>();
            for (int i = 0; i < ZXingScannerView.ALL_FORMATS.size(); i++) {
                mSelectedIndices.add(i);
            }
        }

        for (int index : mSelectedIndices) {
            formats.add(ZXingScannerView.ALL_FORMATS.get(index));
        }
        if (mScannerView != null) {
            mScannerView.setFormats(formats);
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        mScannerView.stopCamera();
        closeMessageDialog();
        closeFormatsDialog();
    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }

}