okhttp 请求list数据实例

public class DataBean {


    /**
     * id : 61684
     * movieName : 《猜火车2》先导预告片
     * coverImg : http://img31.mtime.cn/mg/2016/07/26/143142.64770465.jpg
     * movieId : 228230
     * url : http://vfx.mtime.cn/Video/2016/07/26/mp4/160726074707321432_480.mp4
     * hightUrl : http://vfx.mtime.cn/Video/2016/07/26/mp4/160726074707321432.mp4
     * videoTitle : 猜火车2 先导预告片
     * videoLength : 46
     * rating : 0
     * type : ["剧情"]
     * summary : 苏格兰四兄弟回来了！
     */

    private List<ItemData> trailers;

    public void setTrailers(List<ItemData> trailers) {
        this.trailers = trailers;
    }

    public List<ItemData> getTrailers() {
        return trailers;
    }

    public static class ItemData {
        private int id;
        private String movieName;
        private String coverImg;
        private int movieId;
        private String url;
        private String hightUrl;
        private String videoTitle;
        private int videoLength;
        private int rating;
        private String summary;
        private List<String> type;

        get set....
    }
}


public class CacheUtils {


    /**
     * 保持数据
     * @param context
     * @param key
     * @param values
     */
    public static  void putString(Context context,String key,String values){
        SharedPreferences sharedPreferences = context.getSharedPreferences("atguigu",Context.MODE_PRIVATE);
        sharedPreferences.edit().putString(key,values).commit();
    }

    /**
     * 得到缓存的数据
     * @param context
     * @param key
     * @return
     */
    public static String getString(Context context,String key){
        SharedPreferences sharedPreferences = context.getSharedPreferences("atguigu",Context.MODE_PRIVATE);
        return  sharedPreferences.getString(key,"");
    }
}

public class OKHttpListActivity  extends Activity{
    private static final String TAG = OKHttpListActivity.class.getSimpleName();
    private ListView listView;
    private ProgressBar progressBar;
    private TextView tv_nodata;
    private OKHttpListAdapter adapter;
    private String url;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initView();
        getDataFromNet();

    }

    private void getDataFromNet() {
          url = "http://api.m.mtime.cn/PageSubArea/TrailerList.api";
        //得到缓存的数据
        String saveJson = CacheUtils.getString(this,url);
        if(!TextUtils.isEmpty(saveJson)){
            processData(saveJson);
        }


        OkHttpUtils
                .post()
                .url(url)
                .id(100)
                .build()
                .execute(new MyStringCallback());
    }

    private void initView() {
        setContentView(R.layout.activity_okhttplist);
        tv_nodata = (TextView) findViewById(R.id.tv_nodata);
        listView = (ListView) findViewById(R.id.listview);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
    }


    public class MyStringCallback extends StringCallback {
        @Override
        public void onBefore(Request request, int id) {
            setTitle("loading...");
        }

        @Override
        public void onAfter(int id) {
            setTitle("Sample-okHttp");
        }

        @Override
        public void onError(Call call, Exception e, int id) {
            e.printStackTrace();
           tv_nodata.setVisibility(View.VISIBLE);
        }

        @Override
        public void onResponse(String response, int id) {
            Log.e(TAG, "onResponse：complete");
            tv_nodata.setVisibility(View.GONE);

            switch (id) {
                case 100:
                    Toast.makeText(OKHttpListActivity.this, "http", Toast.LENGTH_SHORT).show();
                    break;
                case 101:
                    Toast.makeText(OKHttpListActivity.this, "https", Toast.LENGTH_SHORT).show();
                    break;
            }
            //解析数据和显示数据
            if(response != null){
                //缓存数据
                CacheUtils.putString(OKHttpListActivity.this,url,response);
                processData(response);

            }
        }



        @Override
        public void inProgress(float progress, long total, int id) {
            Log.e(TAG, "inProgress:" + progress);
        }
    }

    /**
     * 解析和显示数据
     * @param json
     */
    private void processData(String json) {

        //解析数据
        DataBean dataBean = parsedJson(json);
        List<DataBean.ItemData> datas =  dataBean.getTrailers();

        if(datas != null && datas.size() >0){
            //有数据
            tv_nodata.setVisibility(View.GONE);
            //显示适配器
            adapter = new OKHttpListAdapter(OKHttpListActivity.this,datas);
            listView.setAdapter(adapter);
        }else{
            //没有数据
            tv_nodata.setVisibility(View.VISIBLE);
        }

        progressBar.setVisibility(View.GONE);
    }


    /**
     * 解析json数据
     *
     * @param response
     * @return
     */
    private DataBean parsedJson(String response) {
        DataBean dataBean = new DataBean();
        try {
            JSONObject jsonObject = new JSONObject(response);
            JSONArray jsonArray = jsonObject.optJSONArray("trailers");
            if (jsonArray != null && jsonArray.length() > 0) {
                List<DataBean.ItemData> trailers = new ArrayList<>();
                dataBean.setTrailers(trailers);
                for (int i = 0; i < jsonArray.length(); i++) {

                    JSONObject jsonObjectItem = (JSONObject) jsonArray.get(i);

                    if (jsonObjectItem != null) {

                        DataBean.ItemData mediaItem = new DataBean.ItemData();

                        String movieName = jsonObjectItem.optString("movieName");//name
                        mediaItem.setMovieName(movieName);

                        String videoTitle = jsonObjectItem.optString("videoTitle");//desc
                        mediaItem.setVideoTitle(videoTitle);

                        String imageUrl = jsonObjectItem.optString("coverImg");//imageUrl
                        mediaItem.setCoverImg(imageUrl);

                        String hightUrl = jsonObjectItem.optString("hightUrl");//data
                        mediaItem.setHightUrl(hightUrl);

                        //把数据添加到集合
                        trailers.add(mediaItem);
                    }
                }
            }

        } catch (JSONException e) {
            e.printStackTrace();
        }
        return dataBean;
    }

}

public class OKHttpListAdapter extends BaseAdapter {

    private final Context context;
    private final List<DataBean.ItemData> datas;

    public OKHttpListAdapter(Context context,List<DataBean.ItemData> datas){
        this.context = context;
        this.datas = datas;
    }
    @Override
    public int getCount() {
        return datas.size();
    }

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

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder viewHolder;
        if(convertView ==null){
            convertView = View.inflate(context, R.layout.item_okhttp_list_image,null);
            viewHolder = new ViewHolder();
            viewHolder.iv_icon = (ImageView) convertView.findViewById(R.id.iv_icon);
            viewHolder.tv_name = (TextView) convertView.findViewById(R.id.tv_name);
            viewHolder.tv_desc = (TextView) convertView.findViewById(R.id.tv_desc);
            convertView.setTag(viewHolder);

        }else{
            viewHolder = (ViewHolder) convertView.getTag();
        }

        //根据位置得到数据
        DataBean.ItemData itemData = datas.get(position);
        viewHolder.tv_name.setText(itemData.getMovieName());
        viewHolder.tv_desc.setText(itemData.getVideoTitle());

        //在列表中使用okhttp-utils请求图片
        OkHttpUtils
                .get()//
                .url(itemData.getCoverImg())//
                .tag(this)//
                .build()//
                .connTimeOut(20000)
                .readTimeOut(20000)
                .writeTimeOut(20000)
                .execute(new BitmapCallback() {
                    @Override
                    public void onError(Call call, Exception e, int id) {
//                        tv_result.setText("onError:" + e.getMessage());
                    }

                    @Override
                    public void onResponse(Bitmap bitmap, int id) {
                        Log.e("TAG", "onResponse：complete");
                        viewHolder.iv_icon.setImageBitmap(bitmap);
                    }
                });

        return convertView;
    }

    static class ViewHolder{
        ImageView iv_icon;
        TextView tv_name;
        TextView tv_desc;
    }
}