問題描述

異常信息如下

java.lang.NullPointerException: Attempt to invoke virtual method ’java.lang.Class java.lang.Object.getClass()’ on a null object reference at org.greenrobot.eventbus.EventBus.postSingleEvent(EventBus.java:363) at org.greenrobot.eventbus.EventBus.post(EventBus.java:251) at com.culsomusic2.coreclass.BasePlayActivity.playBaseMusic(BasePlayActivity.java:90)at com.culsomusic2.songlistmodule.ui.mactivity.activityEntity.SongContentActivity$4.onItemClick(SongContentActivity.java:252) at com.zhy.adapter.recyclerview.MultiItemTypeAdapter$1.onClick(MultiItemTypeAdapter.java:68)at android.view.View.performClick(View.java:5198)at android.view.View$PerformClick.run(View.java:21147) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

EventBus 注冊和反注冊如下 @Override

protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); mContext = MyApplication.getContext(); Intent intent = new Intent(mContext, BaseControlService.class); startService(intent); //注冊EventBus EventBus.getDefault().register(this);}

@Override

protected void onDestroy() { //反注冊EventBus EventBus.getDefault().unregister(this); mContext = null; super.onDestroy();}

調用的方法如下 public void playBaseMusic(@Nullable BaseTagBean bean) {

BaseTagBean tagBean; if (bean==null){tagBean=new BaseTagBean();tagBean.setTag(CONTROL_TAG_PLAY); }else {tagBean=bean;tagBean.setTag(CONTROL_TAG_PLAY); } EventBus.getDefault().post(tagBean);}

只要調用上述playBaseMusic方法它就在EventBus.getDefault().post(tagBean);這個地方報空指針錯誤；請問大家如何解決。

問題解答

目前這種情況看，只有可能是你的tagbean是null了，打個斷點看看吧。