radiobutton动态设置drawable

平方X

                StateListDrawable stateListDrawable=new StateListDrawable();
                stateListDrawable.addState(new int[]{android.R.attr.state_checked},getContext().getResources().getDrawable(R.drawable.ic_launcher));
                stateListDrawable.addState(new int[]{},getContext().getResources().getDrawable(R.drawable.ic_launcher));
                radiobutton.setButtonDrawable(stateListDrawable);
1，StateListDrawable extends DrawableContainer
DrawableContainer extends Drawable
2，addState(int[] stateSet, Drawable drawable)
引用的是android.R.attr.state_checked，注意是state_checked，而不是checked
3,空数组为默认4，设置的是ButtonDrawable，而不是Drawable