老师，能帮我看看为什么这里拿不到这个手机应用信息的集合呢？

protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   
   listView = (ListView)findViewById(R.id.list_view);

   IntentFilter filter = new IntentFilter();
   filter.addAction("com.App_information");
   registerReceiver(new BroadcastReceiver() {
       @Override
       public void onReceive(Context context, Intent intent) {
           List<ApplicationInfo> result = intent.getParcelableArrayListExtra("App_info");
           Myapplication app = (Myapplication)getApplication();
           app.setApplist(result);
       }
   }, filter);
   Myapplication app = (Myapplication)getApplication();
   listView.setAdapter(new AppAdapter(app.getApplist(), MainActivity.this));
}

系统提示说setAdapter里面的app.getApplist()是空的，怎么才能将onReceive里的这个集合拿到外边使用啊，我用了applicaiton的全局属性也不行！