java - Fragment之间如何共享公共资源？

问题描述

我有一个带有 ViewPager 的 Activity，上面有 3 个选项卡。该应用程序从 EventFragment 开始，这是第一个选项卡，它具有可以在复选框中选中的项目。当我切换到第二个选项卡 TicketFragment 时，我想获取在 EventFragment 中检查的项目。

我最初的想法是制作PagerActivity Singleton并让它存储所有数据，并且可以从那里请求它，但我不知道这是否是一个好方法。

我的代码：

PagerActivity（启动器）

public class PagerActivity extends AppCompatActivity {

    public Activity activity = this;
    private static final String TAG = "PagerActivity";
    private BettingAdapter adapter;
    private BettingListDatabase database;
    private Answer bettingData=null;


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pager);
    }

    @Override
    protected void onResume() {
        super.onResume();
        ViewPager mainViewPager = findViewById(R.id.mainViewPager);
        TabPagerAdapter tabPagerAdapter = new TabPagerAdapter(getSupportFragmentManager(), this);
        mainViewPager.setAdapter(tabPagerAdapter);
    }
}

寻呼机适配器

public class TabPagerAdapter extends FragmentPagerAdapter {
    private Context context;

    public TabPagerAdapter(FragmentManager fm, Context context) {
        super(fm);
        this.context = context;
    }

    // This method is called whenever the adapter needs a Fragment for a certain position
    @Override
    public Fragment getItem(int position) {
        Fragment ret = null;
        switch (position) {
            case 0:
                ret = new EventFragment();
                break;
            case 1:
                ret = new TicketFragment();
                break;

            case 2:
                ret = new BalanceFragment();
                break;
        }
        return ret;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        String title;
        switch (position) {
            case 0:
                title = context.getString(R.string.events);
                break;
            case 1:
                title = context.getString(R.string.ticket);
                break;
            case 2:
                title = context.getString(R.string.balance);
                break;
            default:
                title = "";
        }
        return title;
    }

    @Override
    public int getCount() {
        return 3;
    }
}

事件片段：pastebin

票务片段：

public class TicketFragment extends Fragment {

    private BettingAdapter adapter;
    private RecyclerView recyclerView;


    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.content_ticket,
                container, false);

        recyclerView = view.findViewById(R.id.MainRecyclerView);
        adapter=new BettingAdapter((BettingAdapter.BettingItemClickListener) getActivity().getParent());

        return view;
    }
}

标签： javaandroidfragment

java - Fragment之间如何共享公共资源？

问题描述

解决方案

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