Question

我正在尝试从Android应用程序中获取Web服务中的xml。我正在运行此代码，但错误消息是'应用程序已意外停止。请再试一次'。我不确定这是一个应用程序异常，因为代码的每个代码都在try块中。这是什么错误？

    public class AndroidTest extends Activity {

             private static final String URL = "http://webservice.url/is/here.aspx";
             TextView v;

            public void onCreate(Bundle savedInstanceState) {
            try {
                super.onCreate(savedInstanceState);
                v = new TextView(this);
                setContentView(v);
                new Obtainer().execute();
            } catch (Exception ex) {
                Toast.makeText(this, ex.toString(), Toast.LENGTH_LONG).show();
            }
        }

        private class Obtainer extends AsyncTask<Void, Void, Void> {

            protected Void doInBackground(Void... params) {
                BufferedReader in = null;
                try {
                    HttpClient client = new DefaultHttpClient();
                    HttpGet request = new HttpGet();
                    request.setURI(new URI(URL));
                    HttpResponse response = client.execute(request);
                    in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
                    StringBuffer sb = new StringBuffer("");
                    String line = "";
                    while ((line = in.readLine()) != null) {
                        sb.append(line + "\n");
                    }
                    in.close();
                    v.setText(sb.toString());
                } catch (Exception ex) {
                    Toast.makeText(getApplicationContext(), ex.toString(), Toast.LENGTH_LONG).show();
                }
                return null;
            }
        }
    }

编辑：现在它抛出异常android.os.NetworkOnMainThreadException虽然创建了这个类（Obtainer）来修复它。

Answer 1

答案非常简单 - 我们无法在非ui线程中运行Toast的show方法，我们也无法在其中使用TextView。

Android从aspx web服务获取xml

1 个答案: