android代码中设置TextView的drawable
Drawable drawable= getResources().getDrawable(R.drawable.drawable);
// 这一步必须要做,否则不会显示.
drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight());
myTextview.setCompoundDrawables(drawable,null,null,null);
以上代码等效于：
myTextview.setCompoundDrawablesWithIntrinsicBounds (Drawable left,
Drawable top, Drawable right, Drawable bottom)