使用okHttp拉取数据(PullToRefreshListView刷新)

最新推荐文章于 2022-02-08 17:05:50 发布

原创最新推荐文章于 2022-02-08 17:05:50 发布 · 734 阅读

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本文介绍了一个基于Android平台的天气应用程序的实现过程，包括如何通过JuHe API获取天气数据，使用OkHttp进行网络请求，以及利用Gson解析JSON数据。文章还详细展示了PullToRefreshListView的使用方法和自定义适配器的编写。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

添加一个library工程，并修改build.gradle

compileSdkVersion 25
buildToolsVersion “25.0.2”
targetSdkVersion 25

还要依赖okhttp：3.8.0 和gson 2.8.0

MainActivity类：

public class MainActivity extends AppCompatActivity  implements PullToRefreshListView.OnRefreshListener2 {
    private PullToRefreshListView pull;
    private int currentPage = 1;
    private ArrayList<String> list;
    private HomeAdapter homeAdapter;

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

    }
    private void getDataforServer() {
        OkHttpClient okHttpClient = new OkHttpClient();
        Request request = new Request.Builder().url("http://v.juhe.cn/weather/index?format=2&cityname=北京&key=e7a94c85b65930fdb88bc0698416287c").build();
        Call call = okHttpClient.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.code() == 200) {
                    String str = response.body().string();
                    Log.d("haha",""+str);
                    Gson gson = new Gson();
                    Bean bean = gson.fromJson(str, Bean.class);
                    final List<Bean.ResultBean.FutureBean> list = bean.getResult().getFuture();

                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {

                            homeAdapter.setData(list);
                            homeAdapter.notifyDataSetChanged();
                        }
                    });

                } else {
                    Log.d("myMessage", "" + response.message());
                }
            }
        });


    }

    private void initData() {
        homeAdapter = new HomeAdapter(this);
        pull.setAdapter(homeAdapter);
        pull.setMode(PullToRefreshBase.Mode.BOTH);
    }

    private void initView() {
        pull = (PullToRefreshListView) findViewById(R.id.pull);
        pull.setOnRefreshListener(this);
        ListView refreshableView = pull.getRefreshableView();
    }
    @Override
    public void onPullDownToRefresh(PullToRefreshBase refreshView) {
        refreshData();
    }
    private void refreshData() {
        currentPage = 1;
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                pull.onRefreshComplete();
                getDataforServer();
            }
        },2000);
    }
    @Override
    public void onPullUpToRefresh(PullToRefreshBase refreshView) {
        loadMore();
    }
    private void loadMore() {
        currentPage++;
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                pull.onRefreshComplete();
                getDataforServer();
            }
        },2000);

    }

}

创建适配器：

public class HomeAdapter extends BaseAdapter {
    private Context mcontext;

    private List<Bean.ResultBean.FutureBean> list = new ArrayList<>();

    public HomeAdapter(Context context) {
        this.mcontext = 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 viewHolder;
        if (convertView == null) {
            viewHolder = new ViewHolder();
            convertView = convertView.inflate(mcontext, R.layout.home_item, null);
            viewHolder.textView = (TextView) convertView.findViewById(R.id.te);

            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.textView.setText(list.get(position).getTemperature());

        return convertView;
    }

    public void setData(List<Bean.ResultBean.FutureBean> data) {
        if (data != null) {
            this.list.addAll(data);
        }
    }

    static class ViewHolder {
        TextView textView;

    }

}