我有同样的需求,并希望快速且简单地进行演示。我不担心最终产品的高效处理。可以使用以下java解决方案轻松实现这一点。
我原来用于将camera2预览连接到TextureView的代码已被注释并替换为与ImageReader相关的表面。
mPreviewReader = ImageReader.newInstance(mPreviewWidth, mPreviewHeight, ImageFormat.JPEG, 1);
Surface surface = mPreviewReader.getSurface();
mCaptureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
mCaptureRequestBuilder.addTarget(surface);
mCameraDevice.createCaptureSession(...
然后我为图像注册了一个监听器:
mPreviewReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
@Override
public void onImageAvailable(ImageReader reader) {
Image image = reader.acquireLatestImage();
if (image != null) {
Image.Plane plane = image.getPlanes()[0];
ByteBuffer buffer = plane.getBuffer();
byte[] bytes = new byte[buffer.capacity()];
buffer.get(bytes);
Bitmap preview = BitmapFactory.decodeByteArray(bytes, 0, buffer.capacity());
image.close();
if(preview != null ) {
Canvas canvas = mTextureView.lockCanvas();
if (canvas != null) {
float[] colorTransform = {
0, 0, 0, 0, 0,
.35f, .45f, .25f, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 1, 0};
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.set(colorTransform);
ColorMatrixColorFilter colorFilter = new ColorMatrixColorFilter(colorMatrix);
Paint paint = new Paint();
paint.setColorFilter(colorFilter);
canvas.drawBitmap(preview, 0, 0, paint);
mTextureView.unlockCanvasAndPost(canvas);
}
}
}
}
}, mBackgroundPreviewHandler);