public?class?BookActivity?extends?AppCompatActivity?{ ????private?BookBiz?bookBiz=new?BookBiz(); ????private?List<BookList.DataBean>?mData=new?ArrayList<>(); ????private?BookListAdapter?adapter; ????private?ListView?mlistView; ????@Override ????protected?void?onCreate(Bundle?savedInstanceState)?{ ????????super.onCreate(savedInstanceState); ????????setContentView(R.layout.activity_book); ????????mlistView=findViewById(R.id.book_lv); ????????initView(); ???????? ????} ????private?void?initView()?{ ????????bookBiz.listView(new?BookCallback<List<BookList.DataBean>>()?{ ????????????@Override ????????????public?void?onError(Exception?ex)?{ ????????????} ????????????@Override ????????????public?void?onSuccess(List<BookList.DataBean>?response)?{ ????????????????if?(response.size()==0){ ????????????????????Log.e("List","返回結(jié)果是空"); ????????????????????return; ????????????????} ????????????????mData.addAll(response); ????????????????Log.e("main1","數(shù)據(jù)"+mData.size()); ??????????????? ????????????} ????????}); ????????Log.e("main2","數(shù)據(jù)"+mData.size());???? ????????adapter=new?BookListAdapter(this,mData); ????????mlistView.setAdapter(adapter); ????} ????protected?static?void?start(Context?context){ ????????Intent?intent=new?Intent(context,BookActivity.class); ????????context.startActivity(intent); ????} }我在后臺的log顯示的main1 有數(shù)據(jù)可是在main2里顯示沒有數(shù)據(jù)。在Callback返回有數(shù)據(jù)? 可是就是拿不到