如何在android中以编程方式获取相对 - 线性布局的宽度和高度？

我需要相对/线性布局的运行时尺寸.

activity_home.xml:

HomeActivity.java:

private int width, height;

RelativeLayout rlParent = (RelativeLayout) findViewById(R.id.rlParent);

w = rlParent.getWidth();
h = rlParent.getHeight();

Log.i("Width-Height", width+"-"+height);

请分享你的想法.