Android : How change clarity the camera when scan a bar code with barcodefraglibv2 library?

I built an android application with Xamarin Studio using a library named barcodefraglibv2 and i found a problem with reading of code bar because when the library launch the camera then the library don't have a camera with automatic focus so the code bar is not understandable. I will want to know how fix this problem, maybe exist some option for change the clarity of camera. The test i did do with another device with 5MP and happened the same problem This is the fragment that use this library

import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.content.BroadcastReceiver;
import android.support.v4.content.LocalBroadcastManager;

import com.abhi.barcode.frag.libv2.BarcodeFragment;
import com.abhi.barcode.frag.libv2.IScanResultHandler;
import com.abhi.barcode.frag.libv2.ScanResult;

public class ScanActivity extends FragmentActivity implements IScanResultHandler {      

    private BarcodeFragment fragment;
    private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            finish();
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.scan);

        fragment = (BarcodeFragment)getSupportFragmentManager().findFragmentById(R.id.Scanner);
        fragment.setScanResultHandler(this);
        fragment.setFrontCamera(false);

        LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("SCAN_ACTION"));
    }

    @Override
    protected void onPause() {
        LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
        super.onPause();
    } 
    @Override
    public void scanResult(ScanResult result) {     
        Intent intent = new Intent("SCAN_RESULT");
        intent.putExtra("Code", result.getRawResult().getText());
        sendBroadcast(intent);
    }
}