如何在片段之间传递列表<object>

Question

我用viewPager和TabLayout创建了我的布局:

public class HomeFragment extends Fragment
{


public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = 3 ;

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View inflatedView = inflater.inflate(R.layout.fragment_home, container,false);


    viewPager = (ViewPager) inflatedView.findViewById(R.id.viewpager);
    int [] drawables = {R.drawable.home,R.drawable.street,R.drawable.map};

    Bundle bundle = new Bundle();

    final SearchFragment searchFragment = new SearchFragment();
    final CardFragment cardFragment = new CardFragment();
    final MapFragment mapFragment = new MapFragment();

    viewPager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager())
    {
        public Fragment getItem(int position)
        {
            if(position == 0)
             return searchFragment;
            else if(position ==1)
             return cardFragment;
            else
             return mapFragment;
        }

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

    tabLayout = (TabLayout) inflatedView.findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);

    for (int i = 0; i < tabLayout.getTabCount(); i++)
    {
        tabLayout.getTabAt(i).setIcon(drawables[i]);
    }

    return inflatedView;

}





    @Override
    public void onAttach(Context context) {

        super.onAttach(context);

    }

    @Override
    public void onDetach() {
        super.onDetach();

    }
}

现在我需要在Asynctask中执行此代码(我只发布doInBackground()方法):

List <ParseObject> result;
ParseQuery<ParseObject> query;

 protected Void doInBackground(final Void... params)
 {
   try
   {
      query = ParseQuery.getQuery("Trains");
      result = query.find();

   }
   catch (com.parse.ParseException e)
   {
    e.printStackTrace();
   }
}

所以现在我想通过List <ParseObject> result;在SearchFragment,CardFragment和MapFragment.

可以使用Bundle吗？或者我有其他方法吗？

Answer 1

由于大多数开发人员都对Serialization和Parcelable的性能参数感到困惑,因此我将在下面进行说明

• Parceleable和Serialization与性能结果的比较b/w Parcelable和Serialization
  
• 为了简化parcelable实现,有一些插件可供IDE使用.请参阅此链接以获取naXa的答案
• 用于Android Parcelable样板代码生成的 Parcelable生成器Android Studio插件的插件

现在来看如何实现Parceleable接口

创建要传递实现Parcelable接口的对象类

public class ContactPojo implements Parcelable{
       private String name;
       private String job_title;
       public void setName(String name) {
        this.name = name;
       }

       public void setJob_title(String job_title) {
        this.job_title = job_title;
       }
    public String getName() {
        return name;
    }

    public String getJob_title() {
        return job_title;
    }
    private ContactPojo(Parcel parcel){
        name=parcel.readString();
        job_title=parcel.readString();
    }
    @Override
    public int describeContents() {
        return 0;
    }
    @Override
    public void writeToParcel(Parcel parcel, int flags) {
        parcel.writeString(name);
        parcel.writeString(job_title);
    }
public static final Parcelable.Creator<ContactPojo> CREATOR = new
            Parcelable.Creator<ContactPojo>() {
                public ContactPojo createFromParcel(Parcel in) {
                    return new ContactPojo(in);
                }

                public ContactPojo[] newArray(int size) {
                    return new ContactPojo[size];
    }};
}

现在通过执行以下操作来填充pojo类

ContactPojo contactPojo= new ContactPojo();
contactPojo.setName("name");
contactPojo.setJob_title("name");

通过此发送给下一个意图

Intent intent=new Intent(this, DetailView.class);
intent.putExtra("Data", contactPojo);

通过后续步骤检索下一个意图中的数据

ContactPojo contactPojo=new ContactPojo();
contactPojo=getIntent().getParcelableExtra("Data");
Log.i(AppConstants.APPUILOG, "Name: " + contactPojo.getName() );