Android使用API​​分页实现无限滚动

Question

我有一个带有分页方案的API，如：

-meta: {
    -pagination: {
        total: 100
        count: 20
        per_page: 20
        current_page: 1
        total_pages: 5
     -links: {
            next: "http://dev.app/api/posts?page=2"         
            }
        }
    }

我试图找到一种方法在我的Android应用程序上使用凌空和无限滚动来实现它，应用程序必须从API读取json分页并向下滚动到20项，然后自动加载到下一页问题是当我到达＆＃34; page = 2＆＃34;然后我再次按下LoadMore按钮它仍然是第2页而不是第3页，我的意思是，当前页面总是1，我不知道为什么会发生这种情况，我试图做的是：

  public class MainActivity extends ListActivity {
    ConnectionDetector cd;
    AlertDialogManager alert = new AlertDialogManager();

    //Progress Dialog
    private ProgressDialog pDialog;

    //make json parser Object
    JSONParser jsonParser = new JSONParser();

    ArrayList<HashMap<String, String>> restaurant_list;

    //Restaurant Json array
    JSONArray restaurants = null;

    JSONObject pagination = null;
    JSONObject link = null;

    private String url_posts = "http://dev.app/api/posts";

    //Flag for current page
    private String nPage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        cd = new ConnectionDetector(getApplicationContext());

        //Check for Internet Connection
        if (!cd.isConnectingToInternet()) {
            //Internet connection not present
            alert.showAlertDialog(MainActivity.this, "Internet Connection Error", "Please Check Your Internet Connection");
            //stop executing code by return
            return;
        }

        restaurant_list = new ArrayList<HashMap<String, String>>();
        new LoadRestaurants().execute();



        Button btnLoadMore = new Button(MainActivity.this);
        btnLoadMore.setText("Show More");

        getListView().addFooterView(btnLoadMore);

        btnLoadMore.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                url_posts = nPage;

                new LoadRestaurants().execute();
            }
        });


    }


    class LoadRestaurants extends AsyncTask<String, String, String> {

        //Show Progress Dialog
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Loading All Restaurants...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        @TargetApi(Build.VERSION_CODES.KITKAT)
        protected String doInBackground(String... arg) {
            //building parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();



            JSONObject json = jsonParser.makeHttpRequest(url_posts, "GET", params);


            try {
                restaurants = json.getJSONArray("data");

                JSONObject meta = json.getJSONObject("meta");

                pagination = meta.getJSONObject("pagination");

                link = pagination.getJSONObject("links");

                nPage = link.getString("next");

                if (restaurants != null) {
                    //loop through all restaurants
                    for (int i = 0; i < restaurants.length(); i++) {
                        JSONObject c = restaurants.getJSONObject(i);

                        //Creating New Hashmap
                        HashMap<String, String> map = new HashMap<String, String>();

                        //adding each child node to Hashmap key
                        map.put("id", c.getString("id"));
                        map.put("look1", c.getString("look1"));
                        map.put("look2", c.getString("look2"));
                        map.put("comment", c.getString("comment"));

                        //adding HashList to ArrayList
                        restaurant_list.add(map);
                    }

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

            return null;
        }

        protected void onPostExecute(String file_url) {

            //dismiss the dialog
            pDialog.dismiss();


            //Updating UI from the Background Thread
            runOnUiThread(new Runnable() {
                @Override
                public void run() {

                    ListAdapter adapter = new SimpleAdapter(
                            MainActivity.this, restaurant_list,
                            R.layout.feed_item, new String[]{
                            "id", "look1", "look2", "comment"}, new int[]{
                            R.id.profilePic, R.id.name, R.id.txtUrl});

                    setListAdapter(adapter);

                    ListView lv = getListView();
                    int currentPosition = lv.getFirstVisiblePosition();
                    lv.setSelectionFromTop(currentPosition + 1, 1);



                }
            });


        }
    }
}