Question

我在片段类中有一个listview，它从JSON获取数据。到目前为止，我能够在列表视图中显示数据。（这里的数据是新闻项目）。我想在列表视图中点击特定新闻时显示新闻的详细页面。

Ex：Listview仅包含新闻的标题和图像。单击该列表视图时，它应显示该特定新闻片段的详细版本。我怎么能这样做？

这是具有Listview的片段类。

package com.fortuna.cinemalk;

import java.util.ArrayList;

import android.app.Activity;
import android.app.FragmentManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.ListView;
import android.content.Intent;
import android.widget.AdapterView;



import com.fortuna.cinemalk.adapter.LazyAdapter;
import com.fortuna.cinemalk.model.BaseElement;
import com.fortuna.cinemalk.service.CommonVariable;
import com.fortuna.cinemalk.service.JSONServices;
import com.fortuna.cinemalk.util.Element;

public class NewsFramgment extends Fragment {

    private GridView gridView;
    private ListView listView;

    private ArrayList<BaseElement> News;
    private LazyAdapter adapter;
    private Activity activity;
    private CommonVariable commonVariable;

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

        View view = inflater.inflate(R.layout.news_fragment, container,
                false);

        activity = this.getActivity();

        commonVariable = (CommonVariable) activity.getApplication();

        //gridView = (GridView) view.findViewById(R.id.gridView2);
        listView = (ListView) view.findViewById(R.id.list);


        listView.setOnItemClickListener(new OnItemClickListener() {
               public void onItemClick(AdapterView<?> parent, View v,
                 int position, long id) {


              android.support.v4.app.Fragment detail = new NewsDetailFragment();
              android.support.v4.app.FragmentManager fragmentManager = getFragmentManager();
              fragmentManager.beginTransaction().add(R.id.content_frame, detail).addToBackStack("back").commit();
               }
              });



            new BackGround().execute();

        return view;
    }


public class BackGround extends AsyncTask<Void, Void, Void> {

        @Override
        protected Void doInBackground(Void... params) {

            News = JSONServices.getNewsDescription();
            return null;
        } 



        @Override
        /* check again */
        protected void onPostExecute(Void result) {

            commonVariable.setNewsDescription(News);

            adapter = new LazyAdapter(News, activity,Element.NEWS_LIST.getType());

            listView.setAdapter(adapter);

            super.onPostExecute(result);
        }

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();
        }

    }


}

在代码中，您会注意到单击某个项目时会移动到NewsDetailFragment。这就是我想要编写的类。

PS：我的JSON已经包含了所有细节，包括标题，图片，描述..

UPDATE ::这是我的NewsDetailFragment类。它显示所有新闻，而不是我点击的那个。

package com.fortuna.cinemalk;

import java.util.ArrayList;

import android.app.Activity;
import android.app.FragmentManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.ListAdapter;
import android.content.Intent;
import android.widget.AdapterView;



import com.fortuna.cinemalk.adapter.LazyAdapter;
import com.fortuna.cinemalk.model.BaseElement;
import com.fortuna.cinemalk.service.CommonVariable;
import com.fortuna.cinemalk.service.JSONServices;
import com.fortuna.cinemalk.util.Element;

public class NewsDetailFragment extends Fragment {

    private GridView gridView;
    private View view1;

    private ArrayList<BaseElement> newsdetail;
    private LazyAdapter adapter;
    private Activity activity;
    private CommonVariable commonVariable;

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

        View view = inflater.inflate(R.layout.newsdetail_fragment, container,
                false);

        activity = this.getActivity();

        commonVariable = (CommonVariable) activity.getApplication();

        view1 = (View) view.findViewById(R.id.list);


        /*gridView.setOnItemClickListener(new OnItemClickListener() {
               public void onItemClick(AdapterView<?> parent, View v,
                 int position, long id) {


              android.support.v4.app.Fragment detail = new TheaterDetailFragment();
              android.support.v4.app.FragmentManager fragmentManager = getFragmentManager();
              fragmentManager.beginTransaction().add(R.id.content_frame, detail).addToBackStack("back").commit();
               }
              }); */



            new BackGround().execute();

        return view;
    }


public class BackGround extends AsyncTask<Void, Void, Void> {

        @Override
        protected Void doInBackground(Void... params) {

            newsdetail = JSONServices.getNewsDescription();
            return null;
        } 



        @Override
        /* check again */
        protected void onPostExecute(Void result) {

            commonVariable.setTheater(newsdetail);

            adapter = new LazyAdapter(newsdetail, activity,Element.NEWS_DETAIL.getType());

            ((AdapterView<ListAdapter>) view1).setAdapter(adapter);

            super.onPostExecute(result);
        }

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();
        }

    }


}

Answer 1

您可以使用以下

FragmentTransaction fragmentTransaction = getSupportFragmentManager()
                .beginTransaction();
Fragment profileFragment = new MovieDetailFragment();//the fragment you want to show
profileFragment.setArguments(bundle);
fragmentTransaction
    .replace(R.id.content_frame, profileFragment);//R.id.content_frame is the layout you want to replace
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();

修改

FragmentTransaction用于执行添加或删除片段等操作，即当您更换/更改现有布局时，我们执行此类事务以替换片段。捆绑包是配置更改时保存数据更改或将数据从一个活动传递到另一个活动或在片段之间传递数据所需的最便捷的工具。Fragments请阅读此内容。

适用于link1和link2以及docs。捆绑包很容易理解。

希望编辑有所帮助。

Answer 2

我这样做......

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View v=inflater.inflate(R.layout.frag_for_accsummary,container, false);
       final FragmentTransaction ft=    getFragmentManager().beginTransaction();


      //geting resources
    Resources res=getActivity().getResources();
    title=res.getStringArray(R.array.title);
        // TODO Auto-generated method stub

    ListView l=(ListView)v.findViewById(R.id.list);
    MyAadapter m=new MyAadapter(getActivity(),R.layout.singlerow, title, icon);//custom adapter
    //title--> array of text to be shown on list    icon-->  array of images to be shown on list     R.layout.singlerow--> tells how single row should appear in list
    l.setAdapter(m);

    l.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View v, int position,
                long id) {
            // TODO Auto-generated method stub
            Log.i("in seton","setonclick");

            switch(position){

            case 0: 
                AccSummary frag0=new AccSummary();

            bun.putString("uname",uname);
            bun.putString("sessid",sessid);
            bun.putString("custid",custid1);
            frag0.setArguments(bun);
            ft.replace(R.id.lin2,frag0);
            ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
            ft.addToBackStack(null);
            ft.commit();
            Log.i("FragFor", uname);

                break;

    //-------------------------------------------------------------------       

            case 1:
                      FromAcc acc=new FromAcc();
                      bun.putString("Name",uname); 
                      bun.putString("sessid",sessid);// key - value pair
                      bun.putString("custid",custid1);
                      acc.setArguments(bun);
                      ft.replace(R.id.lin2, acc);
                      ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                        ft.addToBackStack(null);
                        ft.commit();


            break;
            case 2:break;
            case 3:break;
            case 4:break;
            case 5:ChangepassFrag cf=new ChangepassFrag();
                  bun.putString("uname",uname);
                  bun.putString("sessid",sessid);
                  bun.putString("custid",custid);
                  bun.putString("password",pass);
                 cf.setArguments(bun);
                    ft.replace(R.id.lin2,cf);
                    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                    ft.addToBackStack(null);
                    ft.commit();
                    break;

            case 6:   break;
            case 7:break;
            case 8:break;
            case 9:
                   Fragment1 f=new Fragment1();
                   bun.putString("uname",uname);
                    bun.putString("sessid",sessid);
                //  bun.putString("custid",custid1);
                    f.setArguments(bun);
                        ft.replace(R.id.lin2,f);
                        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                        ft.addToBackStack(null);
                        ft.commit();
                break;
            case 10:break;
            }




            }





    });





    return v;
}

单击列表视图中的项目时显示片段

2 个答案: