还有其他人在使用Android 4.2中的StateListDrawable
时遇到了使用新的ShapeDrawable()
的问题吗?我曾经这样做:
ShapeDrawable bg = new ShapeDrawable(); //default Ctor
ShapeDrawable hl = new ShapeDrawable();
hl.getPaint().setColor(color1);
bg.getPaint().setColor(color2);
StateListDrawable s1 = new StateListDrawable();
s1.addState(new int[]{android.R.attr.state_pressed}, hl);
s1.addState(new int[]{}, bg);
但是在Android4.2中,这种方法不再起作用,会抛出nullpointerexception
异常:
java.lang.NullPointerException
at android.graphics.drawable.ShapeDrawable.mutate(ShapeDrawable.java:387)
at android.graphics.drawable.DrawableContainer.selectDrawable(DrawableContainer.java:315)
at android.graphics.drawable.StateListDrawable.onStateChange(StateListDrawable.java:106)
at android.graphics.drawable.StateListDrawable.addState(StateListDrawable.java:89)
我通过修改ShapeDrawable
的构造函数解决了这个问题:
ShapeDrawable bg = new ShapeDrawable(new RectShape());
ShapeDrawable hl = new ShapeDrawable(new RectShape());
现在这样做很好,但我想知道为什么使用默认构造函数不起作用 =)。谢谢您的时间 :)