带图标的button setCompoundDrawablesWithIntrinsicBounds

TextView 的setCompoundDrawablesWithIntrinsicBounds与setCompoundDrawables的区别是什么？

大沙发，同问。

public void  setCompoundDrawables  (Drawable left, Drawable top, Drawable right, Drawable bottom)
Since: API Level 1

Sets the Drawables (if any) to appear to the left of, above, to the right of, and below the text. Use null if you do not want a Drawable there. The Drawables must already have had setBounds(Rect) called.
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public void  setCompoundDrawablesWithIntrinsicBounds  (Drawable left, Drawable top, Drawable right, Drawable bottom)
Since: API Level 1

Sets the Drawables (if any) to appear to the left of, above, to the right of, and below the text. Use null if you do not want a Drawable there. The Drawables' bounds will be set to their intrinsic bounds.

文字描述上有差别 但是领悟不了 呵呵

我做了一个测试，大概推出这样的结论：
setCompoundDrawables 画的drawable的宽高是按drawable.setBound()设置的宽高，所以才有The Drawables must already have had setBounds(Rect) called.这句话之说。
而setCompoundDrawablesWithIntrinsicBounds是画的drawable的宽高是按drawable固定的宽高，即通过getIntrinsicWidth()与getIntrinsicHeight()获得，所以才有The Drawables' bounds will be set to their intrinsic bounds.这句话之说！

setCompoundDrawablesWithIntrinsicBounds..

还是看看源码清楚些 
public void setCompoundDrawablesWithIntrinsicBounds(Drawable left, Drawable top,
            Drawable right, Drawable bottom) {

        if (left != null) {
            left.setBounds(0, 0, left.getIntrinsicWidth(), left.getIntrinsicHeight());
        }
        if (right != null) {
            right.setBounds(0, 0, right.getIntrinsicWidth(), right.getIntrinsicHeight());
        }
        if (top != null) {
            top.setBounds(0, 0, top.getIntrinsicWidth(), top.getIntrinsicHeight());
        }
        if (bottom != null) {
            bottom.setBounds(0, 0, bottom.getIntrinsicWidth(), bottom.getIntrinsicHeight());
        }
        setCompoundDrawables(left, top, right, bottom);
    }