I/CameraFramework: handleMessage: 16

package fr.cityfid.cityfidtablet;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Point;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.util.SparseArray;
import android.view.Display;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import com.google.android.gms.vision.CameraSource;
import com.google.android.gms.vision.Detector;
import com.google.android.gms.vision.barcode.Barcode;
import com.google.android.gms.vision.barcode.BarcodeDetector;

import java.io.IOException;

import butterknife.BindView;
import butterknife.ButterKnife;

public class ScanActivity extends AppCompatActivity {

    @BindView(R.id.scan_coordinator)
    CoordinatorLayout coordinatorLayout;
    @BindView(R.id.camera_view)
    SurfaceView cameraView;

    private BarcodeDetector barcodeDetector;
    private CameraSource cameraSource;
    private String lastDetectedCode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scan);
        ButterKnife.bind(this);

        //instanciate barcode detecor
        barcodeDetector = new BarcodeDetector.Builder(this)
                .setBarcodeFormats(Barcode.QR_CODE | Barcode.DATA_MATRIX)
                .build();
        barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
            @Override
            public void release() {
                Log.d("DETECTOR", "Detector processor released");
            }

            @Override
            public void receiveDetections(Detector.Detections<Barcode> detections) {
                final SparseArray<Barcode> barcodes = detections.getDetectedItems();

                if (barcodes.size() != 0){
                    lastDetectedCode = barcodes.valueAt(0).displayValue;

                    Intent intent = new Intent(ScanActivity.this, ScanResultActivity.class);
                    intent.putExtra("QRCODE", lastDetectedCode);
                    startActivity(intent);

                    cameraSource.stop();
                    cameraSource.release();
                    barcodeDetector.release();

                    finish();

                    return;
                }
            }
        });

        //instanciating camera source
        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        cameraSource = new CameraSource.Builder(this, barcodeDetector)
                .setFacing(CameraSource.CAMERA_FACING_FRONT)
                .setAutoFocusEnabled(true)
                .setRequestedFps(1.0f)
                .build();

        //binding camera view
        cameraView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                startCamera(holder);
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {

            }
        });

        //wait before closing activity
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                finish();
            }
        }, 15000);
    }

    /**
     * This method starts the camera and attach it to the SurfaceHolder
     * @param holder SurfaceHolder
     */
    private void startCamera(SurfaceHolder holder){
        try {
            if (ContextCompat.checkSelfPermission(ScanActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED){
                Snackbar.make(coordinatorLayout, R.string.waiting_camera_permission, Snackbar.LENGTH_LONG).show();
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, 9001);
            } else {
                cameraSource.start(holder);
                Snackbar.make(coordinatorLayout, R.string.present_qr, Snackbar.LENGTH_INDEFINITE).show();
            }
        } catch (IOException e){
            Log.e("CAMERA_ERR", e.getMessage());
            Snackbar.make(coordinatorLayout, R.string.camera_io_error, Snackbar.LENGTH_LONG).show();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode){
            case 9001:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
                    startCamera(cameraView.getHolder());
                }
                break;
        }
    }

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