列表类的列表视图示例（从JSON获取数据）

时间：2014-08-13 08:11:35

标签： android json listview android-fragments

有人可以给我一个关于如何在片段类中使用listview的示例代码。 我有一个JSON，它有一些新闻的数据。我想在列表视图中显示这些新闻。当您点击列表视图中的项目时，您将被引导至详细的新闻栏目。 我怎样才能做到这一点？我已经有一个适配器类，我用于我的程序中的其他活动

LazyAdapter类

package com.fortuna.cinemalk.adapter;

import java.util.ArrayList;
import java.util.LinkedHashMap;

import com.fg.sinhala.Sihala;
import com.fortuna.cinemalk.lazyloading.ImageLoader;
import com.fortuna.cinemalk.R;
import com.fortuna.cinemalk.model.BaseElement;
import com.fortuna.cinemalk.model.Film;
import com.fortuna.cinemalk.model.GridElement;
import com.fortuna.cinemalk.model.News;
import com.fortuna.cinemalk.model.Theater;
import com.fortuna.cinemalk.util.Element;

import android.app.Activity;
import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class LazyAdapter extends BaseAdapter {

    private ArrayList<BaseElement> item;

    private Activity activity;
    private LayoutInflater layoutInflater;
    private int type;

    private static LayoutInflater inflater = null;
    public ImageLoader imageLoader;
    Context context;

    public LazyAdapter(ArrayList<BaseElement> item, Activity activity, int type) {

        this.item = item;

        this.activity = activity;
        this.type = type;
        this.layoutInflater = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        imageLoader = new ImageLoader(activity.getApplicationContext());

    }

    @Override
    public int getCount() {
        return item.size();
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int id) {
        return id;
    }

    @Override
    public View getView(int position, View viewCon, ViewGroup viewGroup) {

        View view = null;
        ListView view1 = null;

        if (Element.LEFT_MENU.getType() == type) {

            view = layoutInflater.inflate(R.layout.leftmenu_list_layout, null);

            GridElement gridElement = (GridElement) item.get(position);

            ImageView image = (ImageView) view.findViewById(R.id.leftmenu_icon);

            TextView title = (TextView) view.findViewById(R.id.leftmenu_title);

            title.setText(gridElement.getTitle());

            image.setImageResource(gridElement.getIcon());

        }
        if (Element.MOVIE_LIST.getType() == type) {

            view = layoutInflater.inflate(R.layout.movie_list_layout, null);

            Film film = (Film) item.get(position);

            ImageView image = (ImageView) view.findViewById(R.id.image);

            TextView title = (TextView) view.findViewById(R.id.title);

            title.setText(film.getTitle());

            // image.setImageResource(film.getImage());

        }

/*  if (Element.NEWS_LIST.getType() == type) {

            view1 = (ListView) layoutInflater.inflate(R.layout.news_list, null);

            News news = (News) item.get(position);

            ImageView image = (ImageView) view.findViewById(R.id.news_image);

            TextView title = (TextView) view.findViewById(R.id.news_title);

            title.setText(news.getTitle());

            // image.setImageResource(film.getImage());

        } */

        if (Element.THEATER_LIST.getType() == type) {

            view = layoutInflater.inflate(R.layout.theater_list_layout, null);

            Theater theater = (Theater) item.get(position);

            TextView name = (TextView) view.findViewById(R.id.theater_name);

            ImageView image = (ImageView) view.findViewById(R.id.image_theater);





        /*  name.setText(theater.getName());

            imageLoader
                    .DisplayImage(theater.getTheaterImage(), activity, image);
        }

        return view;
    }
} */



        //use this to all elements that have sinhala texts  
    Sihala sinhla = new Sihala(activity);

            Typeface typeface = Typeface.createFromAsset(activity.getAssets(), sinhla.font);

            name.setTypeface(typeface);

            name.setText(sinhla.getSinhalaString(theater.getName()));

            imageLoader
                    .DisplayImage(theater.getTheaterImage(), activity, image);
        }

        return view;
    }
}

我尝试过的NewsFragment类（不确定这是否正确）

package com.fortuna.cinemalk;

import java.util.ArrayList;

import com.fortuna.cinemalk.TheaterFragment.BackGround;
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;

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

public class NewsFramgment extends Fragment{

    private ListView listview;
    private Activity activity;
    private CommonVariable commonVariable;
    private LazyAdapter adapter;
    private ArrayList<BaseElement> newscolumn;



    @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();

        listview = (ListView) view.findViewById(R.id.listView1);


        /*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) {

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



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

            commonVariable.setTheater(newscolumn);

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

            listview.setAdapter(adapter);

            super.onPostExecute(result);
        }

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

    }


}

我的JSON服务类

package com.fortuna.cinemalk.service;

import java.util.ArrayList;
import java.util.LinkedHashMap;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.graphics.Paint.Join;
import android.widget.TextView;

import com.fortuna.cinemalk.model.BaseElement;
import com.fortuna.cinemalk.model.Film;
import com.fortuna.cinemalk.model.FilmBanner;
import com.fortuna.cinemalk.model.FilmCategory;
import com.fortuna.cinemalk.model.Home;
import com.fortuna.cinemalk.model.News;
import com.fortuna.cinemalk.model.Theater;
import com.fortuna.cinemalk.util.JSONTag;
import com.fortuna.cinemalk.util.ServiceURL;

public class JSONServices {

    public static ArrayList<BaseElement> getCategory() {



        ArrayList<BaseElement> catogory = new ArrayList<BaseElement>();

        try {
            JSONObject jsonObject = new JSONObject(
                    CommonService.readJsonUrl(ServiceURL.CATEGORY_TOPCAT
                            .getUrl()));

            JSONArray array = jsonObject.getJSONArray(JSONTag.CATEGORY.getTag());
            for (int i = 0; i < array.length(); i++) {

                JSONObject jsonObj = array.getJSONObject(i);

                FilmCategory filmCategory = new FilmCategory();

                filmCategory.setCatId(jsonObj.getString(JSONTag.ID.getTag()));
                filmCategory.setCategory(jsonObj.getString(JSONTag.NAME
                        .getTag()));

                catogory.add(filmCategory);

                // news.put(i, newsCategory);

            }

        } catch (JSONException e) {

            e.printStackTrace();
            return null;
        }

        return catogory;

    }

    public static ArrayList<BaseElement> getCategoryById(String id) {

        ArrayList<BaseElement> films = new ArrayList<BaseElement>();

        try {
            JSONObject jsonObject = new JSONObject(CommonService.readJsonFromUrl(ServiceURL.MOVE_BY_CATEGORY
                            .getUrl() + id));

            JSONArray array = jsonObject.getJSONArray(JSONTag.MOVIE.getTag());
            for (int i = 0; i < array.length(); i++) {

                JSONObject jsonObj = array.getJSONObject(i);

                Film film = new Film();

                film.setActorsActress(jsonObj.getString(JSONTag.ACTOER_ACTRESS
                        .getTag()));
                film.setComposer(jsonObj.getString(JSONTag.COMPOSER.getTag()));
                film.setDescrition(jsonObj.getString(JSONTag.DESCRIPTION
                        .getTag()));
                film.setDirecter(jsonObj.getString(JSONTag.DIRECTOR.getTag()));
                film.setGenre(jsonObj.getString(JSONTag.GENERE.getTag()));
                film.setImage(jsonObj.getString(JSONTag.IMAGE_2.getTag()));
                film.setIMDbRating(jsonObj.getString(JSONTag.IMDB_RATING
                        .getTag()));
                film.setLength(jsonObj.getString(JSONTag.LENGTH.getTag()));
                film.setNewsId(jsonObj.getString(JSONTag.ID.getTag()));
                film.setPlot(jsonObj.getString(JSONTag.PLOT.getTag()));
                film.setProducer(jsonObj.getString(JSONTag.PRODUCER.getTag()));

                films.add(film);

            }

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return films;

    }

    public static ArrayList<BaseElement> getNewsDescription() {

        ArrayList<BaseElement> newsitem = new ArrayList<BaseElement>();

        //LinkedHashMap<Integer, BaseElement> news = new LinkedHashMap<Integer, BaseElement>();

        try {
            JSONObject jsonObject = new JSONObject(
                    CommonService
                            .readJsonFromUrl(ServiceURL.NEWS_CONTENT
                                    .getUrl() ));

            JSONArray array = jsonObject.getJSONArray("news");
            for (int i = 0; i < array.length(); i++) {

                JSONObject jsonObj = array.getJSONObject(i);

                News newsDescription = new News();

                newsDescription.setNewsId(jsonObj.getString(JSONTag.ID.getTag()));

                newsDescription.setTitle(jsonObj.getString(JSONTag.TITLE.getTag()));

                //newsDescription.setShortDescription(jsonObj.getString(JSONTag.SHORTDESCRIPTION.getTag()));

                //newsDescription.setDescrition(jsonObj.getString(JSONTag.DESCRIPTION.getTag()));

                newsDescription.setThumbImage(jsonObj.getString(JSONTag.THUMBNAIL.getTag()));

                //newsDescription.setImage(jsonObj.getString(JSONTag.IMAGE.getTag()));

                //newsDescription.setTrailerImage(jsonObj.getString(JSONTag.TRAILER_IMAGE.getTag()));

                //newsDescription.setVideo(jsonObj.getString(JSONTag._VIDEO.getTag()));

                //news.put(i, newsDescription);

                newsitem.add(newsDescription);

}

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;

        }

        return newsitem;

    }




    public static LinkedHashMap<Integer, BaseElement> getHomeContent() {

        LinkedHashMap<Integer, BaseElement> news = new LinkedHashMap<Integer, BaseElement>();

        try {
            JSONObject jsonObject = new JSONObject(
                    CommonService.readJsonFromUrl(ServiceURL.HOME_CONTENT
                            .getUrl()));

            JSONArray array = jsonObject.getJSONArray("home");
            for (int i = 0; i < array.length(); i++) {

                JSONObject jsonObj = array.getJSONObject(i);

                Home home = new Home();

                JSONArray homeArray = jsonObj.getJSONArray("photos");

                LinkedHashMap<Integer, BaseElement> banner = new LinkedHashMap<Integer, BaseElement>();

                for (int j = 0; j < homeArray.length(); j++) {

                    JSONObject jsonObject2 = homeArray.getJSONObject(j);

                    FilmBanner filmBanner = new FilmBanner();

                    filmBanner.setId(jsonObject2.getString(JSONTag.ID.getTag()));
                    filmBanner.setTitle(jsonObject2.getString(JSONTag.TITLE.getTag()));
                    filmBanner.setDescription(jsonObject2.getString(JSONTag.SHORTDESCRIPTION.getTag()));
                    filmBanner.setImage(jsonObject2.getString(JSONTag.IMAGE.getTag()));
                    filmBanner.setThumb(jsonObject2.getString(JSONTag.THUMBNAIL.getTag()));
                    filmBanner.setType(jsonObject2.getString(JSONTag.TYPE.getTag()));

                    banner.put(j, filmBanner);

                }

                home.setCategory(jsonObj.getString(JSONTag.CATEGORY.getTag()));
                home.setImages(banner);

                news.put(i, home);

            }

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return news;

    }

    public static ArrayList<BaseElement> getTheater() {

        ArrayList<BaseElement> theaters = new ArrayList<BaseElement>();

        try {
            JSONObject jsonObject = new JSONObject(
                    CommonService.readJsonUrl(ServiceURL.THEATER_CONTENT.getUrl()));

            JSONArray array = jsonObject.getJSONArray("theater");
            for (int i = 0; i < array.length(); i++) {

                JSONObject jsonObj = array.getJSONObject(i);

                Theater theater = new Theater();

                theater.setTheaterId(jsonObj.getString(JSONTag.ID.getTag()));
                theater.setTheaterImage(jsonObj.getString(JSONTag.IMAGE.getTag()));
                theater.setName(jsonObj.getString(JSONTag.NAME.getTag()));

                theaters.add(theater);

}

        } catch (JSONException e) {

            e.printStackTrace();
            return null;
        }

        return theaters;

    }

}

1 个答案:

答案 0 :(得分：1)

在LazyAdapter类中，在getView（）重写中，在返回之前在构建视图上添加OnClickListener：

view.setOnClickListener( new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            activity.getFragmentManager().beginFragmentTransaction()
            .replace(
                   R.id.your_place_for_the_details_fragment, 
                   new DetailsFragment(item.get(position)))
            .commit();
        }
    });

这将提供在单击任何动态生成的视图后显示新片段的方法。请记住，根据项目数组中的JSON信息构建新的Details片段。

您可以考虑使用Retrofit of Square组，以便轻松实现REST JSON通信。 http://square.github.io/retrofit/

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