如何传递列表<object>片段之间 [英] How to pass list <object> between fragment

问题描述

我已经使用 viewPager 和 TabLayout 创建了我的布局:

I've created my layout with viewPager and TabLayout:

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(我只发布了 doInBackground() 方法):

now I need to do this code in Asynctask (I post only doInBackground() method):

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 result; 在 SearchFragment、CardFragment 和 MapFragment.

so now I want to pass List <ParseObject> result; at SearchFragment, CardFragment and MapFragment.

可以使用捆绑包吗?或者我必须使用其他方法吗?

It's possible to use a Bundle? Or have I to use other method?

推荐答案

由于大部分开发者对 Serialization 和 Parcelable 的性能参数感到困惑，我把解释放在下面

As most of the developers are confused with performance parameters of Serialization and Parcelable, Im putting the explanation below

• Parcelable 和序列化与性能结果的比较 对比 b/w Parcelable 和序列化
  
• 为了简化parcelable的实现，IDE有可用的插件参考此链接 naXa 的答案
• 用于 Parcelable 生成器的插件 用于 Android Parcelable 样板代码生成的 Android Studio 插件

• Comparison of Parceleable and Serialization with performance results Comparison b/w Parcelable and Serialization
  
• Inorder to simplify parcelable implementation , there are plugin's available for IDE's Refer this Link for naXa's Answer
• Plugin for Parcelable generator Android Studio Plugin for Android Parcelable boilerplate code generation

现在是如何实现Parceleable接口

Now comes how to implement Parceleable interface

创建要传递的对象类实现Parcelable接口

Create object class which you want to pass implement Parcelable interface

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

Now populate the pojo class by the doing the following

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

将它发送到下一个意图

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

通过下一步检索下一个意图中的数据

Retrieval of data in next intent by next steps

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

这篇关于如何传递列表<object>片段之间的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！