【框架】PullToRefresh下拉刷新上拉加载

<com.handmark.pulltorefresh.library.PullToRefreshListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></com.handmark.pulltorefresh.library.PullToRefreshListView>

public class OKHttpUtils {
    private static OkHttpClient client = new OkHttpClient();

    public static void getData(String urlStr, Callback callback) {
        Request request = new Request.Builder().url(urlStr).build();
        client.newCall(request).enqueue(callback);
    }
}

public class MainActivity extends AppCompatActivity {

    private List<String> list;
    private PullToRefreshListView refreshListView;
    private String urlStr = "http://m2.qiushibaike.com/article/list/text?page=%d";
    private int pageCount = 1;
    private ArrayAdapter<String> adapter;
    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            //设置刷新完毕，取消刷新动画
            refreshListView.onRefreshComplete();
            adapter.notifyDataSetChanged();
        }
    };
    private Callback callback;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        list = new ArrayList<>();
        refreshListView = (PullToRefreshListView) findViewById(R.id.lv);
        TextView noDataTv = (TextView) findViewById(R.id.no_data_tv);
        //当ListView中的数据为空时显示的控件
        refreshListView.setEmptyView(noDataTv);
//        initData();
        initNetData();

        //设置既有下拉刷新，又有上拉加载，不设置，默认只有下拉刷新
        refreshListView.setMode(PullToRefreshBase.Mode.BOTH);
        refreshListView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            //下拉刷新回调的方法
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        SystemClock.sleep(3000);
                        mHandler.sendEmptyMessage(0);
                    }
                }).start();
            }

            //上拉加载回调的方法
            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
                OKHttpUtils.getData(String.format(urlStr, ++pageCount), callback);
            }
        });

        refreshListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            //position从1开始
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this, "position:" + position, Toast.LENGTH_SHORT).show();
            }
        });

        ILoadingLayout loadingLayoutProxy = refreshListView.getLoadingLayoutProxy();
        //提示用户松手刷新时的文本
        loadingLayoutProxy.setReleaseLabel("释放时显示的文本");
        //正在加载数据时显示的文本
        loadingLayoutProxy.setRefreshingLabel("正在刷新时显示的文本");
        //下拉时显示的文本
        loadingLayoutProxy.setPullLabel("下拉时显示的文本");
        //显示上次刷新时的文本，可以显示上次刷新时间
        loadingLayoutProxy.setLastUpdatedLabel("显示上次刷新时的文本");
        //获取一个bitmap对象
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
        //设置刷新动画中的图片
        loadingLayoutProxy.setLoadingDrawable(new BitmapDrawable(getResources(), bitmap));
        //设置字体
        loadingLayoutProxy.setTextTypeface(Typeface.createFromAsset(getAssets(), "mycustom.ttf"));


        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);
        refreshListView.setAdapter(adapter);
    }

    /**
     * 初始化网络数据
     */
    private void initNetData() {
        callback = new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.isSuccessful()) {
                    parseJson(response.body().string());
                    mHandler.sendEmptyMessage(0);
                }
            }
        };
        OKHttpUtils.getData(String.format(urlStr, pageCount), callback);
    }

    /**
     * json解析
     *
     * @param string
     */
    private void parseJson(String string) {
        try {
            JSONObject jo = new JSONObject(string);
            JSONArray items = jo.getJSONArray("items");
            for (int i = 0; i < items.length(); i++) {
                String content = items.getJSONObject(i).getString("content");
                list.add(content);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    private void initData() {
        list = new ArrayList<>();
        for (int i = 0; i < 30; i++) {
            list.add("lisi:" + i);
        }
    }
}