public class MainActivity extends AppCompatActivity {

String urldata="http://api.tianapi.com/huabian/?key=48a7d7193e11bd2dd4a683b6e2f90a4f&num=10";

private ListView lv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

lv = findViewById(R.id.lv);

mytask mk = new mytask();

mk.execute();

}

class mytask extends AsyncTask<String,Void,String>{

@Override

protected String doInBackground(String... strings) {

try {

URL url=new URL(urldata);

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

urlConnection.setRequestMethod("GET");

urlConnection.setReadTimeout(5000);

urlConnection.setConnectTimeout(5000);

if (urlConnection.getResponseCode()==200){

InputStream inputStream = urlConnection.getInputStream();

return steamstring(inputStream);

}

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

//执行网络任务之后的请求，，更新UI

@Override

protected void onPostExecute(String s) {

super.onPostExecute(s);

Gson gson = new Gson();

GetData getData = gson.fromJson(s, GetData.class);

Myadapter myadapter = new Myadapter(MainActivity.this, getData.getNewslist());

lv.setAdapter(myadapter);

}

}

public String steamstring(InputStream inputStream ){

StringBuilder builder = new StringBuilder();

BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

String str;

try {

while((str=reader.readLine())!=null){

builder.append(str);

}

} catch (IOException e) {

e.printStackTrace();

}

return builder.toString();

}

}