Code example for Camera

Methods: setOneShotPreviewCallbacksetPreviewCallback

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   */ 
  public void requestPreviewFrame(Handler handler, int message) {
    if (camera != null && previewing) {
      previewCallback.setHandler(handler, message);
      if (useOneShotPreviewCallback) {
        camera.setOneShotPreviewCallback(previewCallback);
      } else { 
        camera.setPreviewCallback(previewCallback);
      } 
    } 
  } 
 
  /** 
   * Asks the camera hardware to perform an autofocus. 
   * 
   * @param handler The Handler to notify when the autofocus completes. 
   * @param message The message to deliver. 
   */ 
  public void requestAutoFocus(Handler handler, int message) {
    if (camera != null && previewing) {
      autoFocusCallback.setHandler(handler, message);