Question

安卓 异步加载报错

代码如下
public class MainActivity extends AppCompatActivity { private static String Url="http://www.imooc.com/api/teacher?type=4&num=30"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); new NewsAsyncTack().execute(Url); } public class NewsAsyncTack extends AsyncTask<String,Void,List<NewsBean>>{ @Override protected List<NewsBean> doInBackground(String... params) { List<NewsBean> list = new ArrayList<>(); String result=""; try { URL url = new URL(params[0]); InputStream is =url.openStream(); InputStreamReader isr = new InputStreamReader(is,"UTF-8"); BufferedReader br = new BufferedReader(isr); String readString; while ((readString=br.readLine())!=null){ result+=readString; } Log.e("HXY",result); } catch (MalformedURLException e) { e.printStackTrace(); }catch (IOException e) { e.printStackTrace(); } return list; } }}

求大神





Answer 1

没有网络访问权限

注意网络连接需要在清单文件中配置app权限

在AndroidManifest.xml中加入

<uses-permission android:name="android.permission.INTERNET"/>