二.tablayout_NewsFragment

最新推荐文章于 2024-04-28 17:17:00 发布

原创最新推荐文章于 2024-04-28 17:17:00 发布 · 153 阅读

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CC 4.0 BY-SA版权

本文介绍了一个使用Android系统的应用程序如何通过Fragment加载不同类别新闻数据的过程。应用根据传入的新闻类型参数从网络获取对应的新闻列表，并使用AsyncTask异步加载数据，最后将数据显示在一个ListView中。

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private ListView listView;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_layout,container,false);

listView = view.findViewById(R.id.list_view);
return view;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);

//获取数据
String name = getArguments().getString("name", "");

//判断
if (name.equals("头条")){
name = "top";
}else if (name.equals("军事")){
name = "junshi";
}else if (name.equals("社会")){
name = "shehui";
}else if (name.equals("财经")){
name = "caijing";
}else if (name.equals("国内")){
name = "guonei";
}

getDataFromNet(name);

}

private void getDataFromNet(final String name) {
AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {
@Override
protected String doInBackground(Void... voids) {
try {
URL url = new URL("http://v.juhe.cn/toutiao/index?type="+name+"&key=c4479ad58f41e7f78a8fa073d0b1f1b5");

HttpURLConnection connection = (HttpURLConnection) url.openConnection();

connection.setRequestMethod("GET");
connection.setReadTimeout(5000);
connection.setConnectTimeout(5000);

//获取
int responseCode = connection.getResponseCode();
if (responseCode == 200){
InputStream inputStream = connection.getInputStream();

String json = streamToString(inputStream,"utf-8");

//打印字符串
Log.i("---",json);

return json;
}

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

return null;
}

@Override
protected void onPostExecute(String s) {

Gson gson = new Gson();
DataDataBean dataDataBean = gson.fromJson(s, DataDataBean.class);

MyAdapter myAdapter = new MyAdapter(getActivity(), dataDataBean.getResult().getData());

listView.setAdapter(myAdapter);
}
};

asyncTask.execute();
}

private String streamToString(InputStream inputStream,String charset) {
try {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream,charset);

BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String s = null;
StringBuilder builder = new StringBuilder();
while ((s = bufferedReader.readLine()) != null){
builder.append(s);
}

bufferedReader.close();
return builder.toString();

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

return null;
}