How to capture images using LWUIt VIdeoComponent

问题:

I have tried using MediaComponent, but since it is now deprecated it wont be good moving forward. Also i was not able to get it to re-size to full screen on the form. I am trying to use VideoComponent to capture a screen shot in an S40 device. I cant find how to instantiate the VideoComponent properly for capturing an image and not playing a video.

回答1:

You can use VideoComponent for capturing an image.

First, to instantiate the VideoComponent, you need to create a native peer:

VideoComponent videoComponent = VideoComponent.createVideoPeer("capture://video");
Player player = (Player) videoComponent.getNativePeer();
player.realize();
VideoControl videoControl = (VideoControl) player.getControl("VideoControl");

To capture the image, you have to start video component and use getSnapshot of Video Control:

videoComponent.start();
videoControl.getSnapshot(null);

If you want to resize the video component to full screen you can use:

videoComponent.setFullScreen(false);

Other posibility is:

videoComponent.setPreferredH(Display.getInstance().getDisplayHeight());
videoComponent.setPreferredW(Display.getInstance().getDisplayWidth());

回答2:

Right now the VideoComponent is mostly designed for playback and doesn't really work well for capture. We will try to improve it in the near future to make it more flexible. Its relatively easy to migrate from MediaComponent to VideoComponent so it shouldn't be a problem.