【框架】swiperefreshlayout&OkHttp

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();
Call call = client.newCall(request);
call.enqueue(callback);
}
}

public class MyAdapter extends BaseAdapter {
private List<String> list;
private Context context;
private LayoutInflater inflater;

public MyAdapter(Context context, List<String> list) {
this.context = context;
this.list = list;
inflater = LayoutInflater.from(context);
}

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

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

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listview_item, null);
holder = new ViewHolder();
holder.content = (TextView) convertView.findViewById(R.id.content);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.content.setText(list.get(position));
return convertView;
}

class ViewHolder {
TextView content;
}
}

public class MainActivity extends AppCompatActivity {

private String qiubaiURL = "http://m2.qiushibaike.com/article/list/text?page=%d";
private List<String> list;
private ListView listView;
private int currentPage = 1;
private SwipeRefreshLayout refreshLayout;
private Callback callback;
private MyAdapter adapter;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
adapter.notifyDataSetChanged();
refreshLayout.setRefreshing(false);
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = new ArrayList<>();
refreshLayout = (SwipeRefreshLayout) findViewById(R.id.srl);
listView = (ListView) findViewById(R.id.lv);
initData();
adapter = new MyAdapter(this, list);
listView.setAdapter(adapter);
refreshLayout.setColorSchemeColors(Color.RED, Color.BLUE, Color.GREEN);
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
OkHttpUtils.getData(String.format(qiubaiURL, (++currentPage)), callback);
}
});
}

private void initData() {
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(qiubaiURL, currentPage), callback);
}

private void parseJson(String jsonStr) {
if (list != null) {
list.clear();
}
try {
JSONObject json = new JSONObject(jsonStr);
JSONArray items = json.getJSONArray("items");
for (int i = 0; i < items.length(); i++) {
JSONObject data = items.getJSONObject(i);
String content = data.getString("content");
list.add(content);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}