Example usage for android.hardware Camera startPreview

Introduction

In this page you can find the example usage for android.hardware Camera startPreview.

Prototype

public native final void startPreview();

Source Link

Document

Starts capturing and drawing preview frames to the screen.

Usage

From source file:hr.abunicic.angular.CameraActivity.java

/**
 * Method that starts detection of shapes.
 *//* w  w  w  .j a v a  2s  .  c o  m*/
public void startDetection() {
    startPreview = !startPreview;

    mCamera.startPreview();
    mCamera.setPreviewCallback(new Camera.PreviewCallback() {
        @Override
        public void onPreviewFrame(byte[] data, Camera camera) {

            //Getting engine results
            VisionEngineResults res = JobScheduler.getEngineResults();
            if (res != null) {
                rp = res;

                updateDescription();
            }

            if (inScheduler < 3 && startPreview) {

                inScheduler++;

                cornersView.setVisibility(View.VISIBLE);

                ByteArrayOutputStream out = new ByteArrayOutputStream();
                params = mCamera.getParameters();
                Camera.Size size = params.getPreviewSize();

                //Compressing frame image to JPEG and then to byte array
                YuvImage yuvImage = new YuvImage(data, ImageFormat.NV21, size.width, size.height, null);
                Rect rectangle = new Rect();
                rectangle.bottom = size.height;
                rectangle.top = 0;
                rectangle.left = 0;
                rectangle.right = size.width;
                yuvImage.compressToJpeg(rectangle, 20, out);
                byte[] imageBytes = out.toByteArray();

                //Starting the PrepareTask for this frame
                new PrepareTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, imageBytes);
                /*
                                    Bitmap bitmap = BitmapFactory.decodeByteArray(imageBytes , 0, imageBytes.length);
                                    try {
                Matrix matrix = new Matrix();
                        
                matrix.postRotate(90);
                        
                Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap,bitmap.getWidth(),bitmap.getHeight(),true);
                        
                Bitmap rotatedBitmap = Bitmap.createBitmap(scaledBitmap , 0, 0, scaledBitmap .getWidth(), scaledBitmap .getHeight(), matrix, true);
                //storeImage(rotatedBitmap);
                if (mRecognizer.getCurrentState().equals(Recognizer.State.READY)) {
                    mRecognizer.recognizeBitmap(rotatedBitmap, Orientation.ORIENTATION_LANDSCAPE_RIGHT, CameraActivity.this);
                }
                                    } catch (IllegalStateException e) {
                        
                                    }
                */

                if (croppedBitmap != null) {
                    if (mRecognizer.getCurrentState().equals(Recognizer.State.READY)) {
                        storeImage(croppedBitmap);
                        mRecognizer.recognizeBitmap(croppedBitmap, Orientation.ORIENTATION_LANDSCAPE_RIGHT,
                                CameraActivity.this);
                    }
                } else {

                }

                camera.startPreview();

            } else if (!startPreview) {
                cornersView.setVisibility(View.GONE);
            }

        }
    });
}

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