基于SnapDragonBoard410C的手势识别

目前在物联网的领域里有许多的交互手段，例如语音交互，手势交互，手柄交互。今天我们就来了解下啥是手势交互！措辞有点糙，请大家见谅。

First:we should download a SDK package from internet.it’s called Touch3D
接下来主要是是向大家介绍这个SDK 是如何集成到我们的应用当中去。

       mCameraEventListener = new CameraEventListener();        mImageRotationListener = new RotationListener();        // Create camera wrapper to handle camera functionality        mCameraWrapper = new CameraWrapper();        // Create touchless wrapper to handle gesture functionality        mTouchlessA3DWrapper = new TouchlessA3DWrapper(new TouchlessEventListener());        // Create helper for managing camera image rotation.        mImageRotationHelper = new ImageRotationHelper(this);

在oncreat中我们先把mTouchlessA3DWrapper对象先实例化。

 private class TouchlessEventListener implements TouchlessA3DWrapper.TouchlessEventListener {        @Override        public void openHandFound() {            // Dispatch UI updates to UI thread            runOnUiThread(new Runnable() {                @Override                public void run() {                    mPoseView.showOpenHand();                }            });        }        @Override        public void closedHandFound() {            // Dispatch UI updates to UI thread            runOnUiThread(new Runnable() {                @Override                public void run() {                    mPoseView.showClosedHand();                }            });        }        @Override        public void pinchFound() {            // Dispatch UI updates to UI thread            runOnUiThread(new Runnable() {                @Override                public void run() {                    mPoseView.showPinch();                }            });        }        @Override        public void thumbsUpFound() {            // Dispatch UI updates to UI thread            runOnUiThread(new Runnable() {                @Override                public void run() {                    mPoseView.showThumbsUp();                }            });        }        @Override        public void poseLost() {            // Dispatch UI updates to UI thread            runOnUiThread(new Runnable() {                @Override                public void run() {                    mPoseView.hideHand();                }            });        }        @Override        public void onError(final Exception e) {            Log.e(LOG_TAG, "TouchlessEventListener.onError: ", e);            // Dispatch event to main queue to update UI            runOnUiThread(new Runnable() {                @Override                public void run() {                    Toast.makeText(TouchlessWorldActivity.this,                            "Error reported from touchless engine. See logs for more info.",                            Toast.LENGTH_LONG).show();                }            });        }    }

PoseView是我们自定的view用于显示手势识别成功后显示相应的图片。
ＣameraWrapper这个类当中主要是封装我们一些操作Camera的一些方法和数据回调。

 private class ImageAvailableListener implements ImageReader.OnImageAvailableListener {        @Override        public void onImageAvailable(ImageReader imageReader) {            Image image = imageReader.acquireLatestImage();            if (image != null) {                int imageWidth = image.getWidth();                int imageHeight = image.getHeight();                //Get Y-plane of the YUV_420_888 image.                Image.Plane yPlane = image.getPlanes()[0];                //Copy plane to a new byte array, skipping row stride.                byte[] bytes = copyPlaneDataToPackedByteArray(yPlane, imageWidth, imageHeight);                //Convert timestamp to milliseconds.                long timestampMilliseconds = (long)(image.getTimestamp() / 1e6f);                if(mCameraEventListener != null) {                    mCameraEventListener.onFrame(bytes, image.getWidth(), image.getHeight(), timestampMilliseconds);//回调数据给Ａｃｔｉｖｉｔｙ！                }                // Return image to image reader for reuse.                image.close();            }        }        private byte[] copyPlaneDataToPackedByteArray(Image.Plane yPlane, int imageWidth, int imageHeight) {            // Create destination buffer            byte[] bytes = new byte[imageWidth * imageHeight];            ByteBuffer buffer = yPlane.getBuffer();            int strideSkip = yPlane.getRowStride() - imageWidth;            // For every row of destination image            for (int row = 0; buffer.hasRemaining(); row += imageWidth) {                // Copy bytes to destination                buffer.get(bytes, row, imageWidth);                // On last row we mus make sure we have room for the stride skip                if(buffer.hasRemaining()) {                    // Skip stride                    buffer.position(buffer.position() + strideSkip);                }            }            return bytes;        }    }

TouchlessA3DWrapper这个类主要是封装了一些手势识别的操作！