Archived:JSR-135 - VideoControl does not show captured content when Player object is started before setting the Displayable as current (Known Issue)

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Compatibility

Platform(s): S60 3rd Edition FP1

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Article

Created: User:Technical writer 1 (14 Sep 2007)

Last edited: hamishwillee (28 Jun 2012)

Overview

A Player object is created in order to capture an image from the phone’s camera. A VideoControl object is then created and appended to an LCDUI Form. When the Player object is started before setting the form as the current displayable, VideoControl does not show the captured content.The CustomItem control paints only white background.

Description

This happens whenever a Player object is started before Display.getDisplay() is called.

How to reproduce

  Form form = new Form("Camera");
 
  // Initializing VideoControl for snapshot taking
  player = Manager.createPlayer("capture://video");
  player.realize();
  vControl = (VideoControl)player.getControl("VideoControl");
 
  form.append((Item)(vControl.initDisplayMode(VideoControl.USE_GUI_PRIMITIVE, null)));       
  player.start(); // user can see where the camera points
 
  Display.getDisplay(this).setCurrent(form);
 
  vControl.setVisible(true); // the video control remains blank

Solution

There is currently no solution. However, the issue can be avoided if Display.getDisplay() is called at least once during the MIDlet’s lifecycle before starting the Player, e.g. in the beginning of MIDlet’s constructor.

  form.append((Item)(vControl.initDisplayMode(VideoControl.USE_GUI_PRIMITIVE, null)));       
 
  // Calling Display.getDisplay before starting the player
  Display.getDisplay(this).setCurrent(form);
  player.start(); // user can see where the camera points