动态改变margin 布局。

moveUserInfoLayoutInY.java

	private void moveUserInfoLayoutInY(int marginTop) {
	    MarginLayoutParams marginParams = new MarginLayoutParams(mUserInfoLayout.getLayoutParams());
	    float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, marginTop, getResources().getDisplayMetrics());
	    marginParams.setMargins((int)mUserInfoLayout.getLeft(), (int)px, 0, 0);
	    RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(marginParams);
	    mUserInfoLayout.setLayoutParams(layoutParams);
	}