CODEWITHSUNDEEP
javaandroidcamerasurfaceview
Abdulwahid
Abdulwahid

Reputation: 337

I want to restart camera source after it is stopped in the same Activity

I made an application for barcode detector so I used SurfaceView to handle camerasource. After camera detects barcode and returns its value I make it to stop. There is no function to restart the camera source and surface view on any event just one fuction which is camersource.start();

It starts but the problem it works in the background and I can't see anything how to fix this problem? and display surfaceview and camera source again.

here is the whole code of the activity onCreate Method

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

        surfaceView = (SurfaceView) findViewById(R.id.cameraPreview);
        txtShow = (TextView) findViewById(R.id.txtShow);

        startBarcode();

    }

    public void startBarcode() {
        barcodeDetector = new BarcodeDetector.Builder(this)
                .setBarcodeFormats(Barcode.ALL_FORMATS)
                .build();
        cameraSource = new CameraSource.Builder(this, barcodeDetector)
                .setRequestedPreviewSize(800, 600)
                .setAutoFocusEnabled(true)
                .build();

        //Events

        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                if (ActivityCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                    //Make Request Runtime Permission
                    ActivityCompat.requestPermissions(MainActivity.this,
                            new String[]{Manifest.permission.CAMERA}, RequestCameraPermissionId);
                    return;
                }
                try {
                    cameraSource.start(surfaceView.getHolder());

                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
                if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {

                    //Make Request Runtime Permission
                    ActivityCompat.requestPermissions(MainActivity.this,
                            new String[]{Manifest.permission.CAMERA}, RequestCameraPermissionId);
                    return;
                }
                try {
                    cameraSource.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                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) {
                    txtShow.post(new Runnable() {
                        @Override
                        public void run() {
                            //create vibrate
                            Vibrator vibrator = (Vibrator) getApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);
                            vibrator.vibrate(500);


                            //set result for Text View
                            txtShow.setText(qrCodes.valueAt(0).displayValue);

                            // surfaceView.setTop(200);
                            cameraSource.stop();


                            final MediaPlayer mp = MediaPlayer.create(MainActivity.this, R.raw.barcode);
                            mp.start();

Upvotes: 4

Views: 2553

Answers (2)

Amjad
Amjad

Reputation: 1624

After code captured you may stop camera source and restart OnCreate methode again. or you can call the activity again by using Intent like:

Intent intent= new Intent (getBaseContext,MainActivity.class); // your activity
startActivity(intent);

Upvotes: 1

mjames276
mjames276

Reputation: 81

to restart after cameraSource.stop() you need:

cameraSource.start(surfaceView.getHolder());

Upvotes: 6

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