TJCamera

J.Cam := TJCamera.JavaClass.open(0); // J.Cam is JCamera object
J.View := TJView.JavaClass.init( TAndroidHelper.Context ); // JView
J.ViewParams := TJViewGroup_LayoutParams.JavaClass.init(Width, Height); // i got Width and Height from J.Cam.getParameters()
TAndroidHelper.Activity.addContentView( J.View, J.ViewParams );

J.SurfaceView := TJSurfaceView.JavaClass.init( J.View.getContext );
J.LayoutParameters := TJViewGroup_LayoutParams.JavaClass.init(Width, Height);
J.SurfaceView.setLayoutParams( J.LayoutParameters );

J.Cam.setPreviewDisplay( J.SurfaceView.getHolder );
J.Cam.startPreview;