drawableRightset 和 CompoundDrawables

android:drawableRight="@drawable/check_down"

在代码中的用法是：

Drawable drawable = getResources().getDrawable(R.drawable.spinner_checked);
drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight());  //设置边界
titleTv.setCompoundDrawables(null, null, drawable, null);   //画在右边