与Activity通讯 使用onAttach()方法检查Activity是否实现回调接口 public static class FragmentA extends ListFragment OnNewsSelectedListener mListener; ..·.省略 @Override public void onAttach(Activityactivity){ super.onAttach(activity); try( mListener =(OnNewsSelectedListener)activity; }catch(ClassCastException e){ throw new classCastException(activity.tostring() +"必须继承接口OnNewsSelectedListener"): } } .省略 Android软件开发 主讲：王海 Android软件开发 主讲：王海 与Activity通讯 • 使用onAttach()方法检查Activity是否实现回调接口 public static class FragmentA extends ListFragment { OnNewsSelectedListener mListener; ......省略 @Override public void onAttach(Activity activity){ super.onAttach(activity); try{ mListener =(OnNewsSelectedListener)activity; }catch(ClassCastException e){ throw new ClassCastException(activity.toString() +"必须继承接口 OnNewsSelectedListener"); } } ......省略 }