How to disable stretching for camera preview?

Question

When I set my SurfaceView as target surface for my camera preview(as in and-dev tutorial for camera API 1) it will stretching picture from camera as far as needed for filling whole surface with that picture. How I can disable that? I want to have 2 black strips for areas with no appropriate image data from camera rather then scaled image over all surface.

Answer 1

Create a custom view with an inner SurfaceView

as @momo reports in his solution (https://stackoverflow.com/a/21653728/2124387):

public class CroppedCameraPreview extends ViewGroup {
  private SurfaceView cameraPreview;
  public CroppedCameraPreview( Context context ) {
    super( context );
    // i'd probably create and add the SurfaceView here, but it doesn't matter
  }
  @Override
  protected void onMeasure( int widthMeasureSpec, int heightMeasureSpec ) {
    setMeasuredDimension( croppedWidth, croppedHeight );
  }
  @Override
  protected void onLayout( boolean changed, int l, int t, int r, int b ) {
    if ( cameraPreview != null ) {
      cameraPreview.layout( 0, 0, actualPreviewWidth, actualPreviewHeight );
    }
  }
}