網上請求圖檔

public class Fragment01 extends Fragment implements XListView.IXListViewListener {
    private View view;
    private ViewPager mVp;
    private XListView mXlv;
    private String json_url="http://api.expoon.com/AppNews/getNewsList/type/1/p";
    int curnetpage=0;
    private List<Bean.DataBean> data;
    private List<String> img;
    private  MyAdapter adapter;
    private ViewPagerAdapter adapter1;
    private int i;
    private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            mVp.setCurrentItem(msg.what);
        }
    };
    private String json_img="http://result.eolinker.com/iYXEPGn4e9c6dafce6e5cdd23287d2bb136ee7e9194d3e9?uri=banner";
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment01, container, false);

        initView(view);
        data = new ArrayList<>();
        img = new ArrayList<>();
        new AsyncTask<String, Integer, String>() {
            @Override
            protected String doInBackground(String... params) {
                String jsonimg = new NetWorkUtil().getImg(json_img);
                return jsonimg;
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                Gson gson = new Gson();
                UserBean userBean = gson.fromJson(s, UserBean.class);
                List<UserBean.BannerBean> banner = userBean.getBanner();
                for (int i=0;i<banner.size();i++){
                    String image_url = banner.get(i).getImage_url();
                    img.add(image_url);
                }
                //建立擴充卡
                adapter1 = new ViewPagerAdapter(img,getActivity());
                mVp.setAdapter(adapter1);
                mVp.setCurrentItem(img.size()*10000);
                i = mVp.getCurrentItem();
                new Thread(){
                    public void run(){
                        while (true){
                            try {
                                sleep(2000);
                                i++;
                                handler.sendEmptyMessage(i);
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                }.start();


            }
        }.execute();
        new AsyncTask<String, Integer, String>() {
            @Override
            protected String doInBackground(String... params) {
                String json = new NetWorkUtil().getJson(json_url+curnetpage);
                return json;
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                Gson gson = new Gson();
                Bean bean = gson.fromJson(s, Bean.class);
                 data = bean.getData();
                //建立擴充卡
                adapter = new MyAdapter(data, getActivity());
                mXlv.setAdapter(adapter);
            }
        }.execute();


        return view;
    }

    private void initView(View view) {
        mVp = (ViewPager) view.findViewById(R.id.vp);
        mXlv = (XListView) view.findViewById(R.id.xlv);
        mXlv.setPullLoadEnable(true);
        mXlv.setPullRefreshEnable(true);
        mXlv.setXListViewListener(this);

    }
    public void onLoad(){
        mXlv.stopRefresh();
        mXlv.stopLoadMore();
        mXlv.setRefreshTime("剛剛");
    }

    @Override
    public void onRefresh() {

        new AsyncTask<String, Intent, String>() {

            @Override
            protected String doInBackground(String... params) {
                String json = new NetWorkUtil().getJson(json_url+curnetpage);
                return json;
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                Gson gson = new Gson();
                Bean bean = gson.fromJson(s, Bean.class);
                data = bean.getData();
                //建立擴充卡
                adapter = new MyAdapter(data, getActivity());
                mXlv.setAdapter(adapter);
                onLoad();
            }
        }.execute();

    }

    @Override
    public void onLoadMore() {
        curnetpage++;
        new AsyncTask<String, Intent, String>() {
            @Override
            protected String doInBackground(String... params) {
                String json = new NetWorkUtil().getJson(json_url+curnetpage);
                return json;
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                Gson gson = new Gson();
                Bean bean = gson.fromJson(s, Bean.class);
                List<Bean.DataBean> data1 = bean.getData();
                data.addAll(data1);
                adapter.notifyDataSetChanged();
            }
        }.execute();


    }

}


       
<android.support.v4.view.ViewPager
    android:id="@+id/vp"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="3"
    ></android.support.v4.view.ViewPager>
<com.bawei.wzq.wzlibrary.view.XListView
    android:id="@+id/xlv"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="7"
    />      
    
public class ViewPagerAdapter extends PagerAdapter{
    private List<String> img;
    private Context context;

    public ViewPagerAdapter(List<String> img, Context context) {
        this.img = img;
        this.context = context;
    }

    @Override
    public int getCount() {
        return Integer.MAX_VALUE;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view==object;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        ImageView imageView = new ImageView(context);
        ImageLoader.getInstance().displayImage(img.get(position%img.size()),imageView);

        container.addView(imageView);
        return imageView;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }

}