android - 如何在不使用异步任务的情况下避免 networkonmainthread 异常

Question

我遇到网络速度非常慢的问题。出于测试目的，我尝试使用 Android 4.0.4 完全切断 asynctask，当然我需要避免在主线程上进行网络调用，否则会出现 networkNotOnMainThread 异常.. 所以我把我的电话包裹在一个线程中，但我仍然收到这个错误。这里到底出了什么问题？？

public class DrupalTestActivity extends Activity {

    private Context mCtx;

    final static String URL = "http://www.mytestsite.com/";
    final static String ENDPOINT = "rest/";
    String mResponse = null;
    TextView textView;




    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        textView = (TextView) findViewById(R.id.textView);
                //retrieves the user account JSON object.
        JSONObject mUserAccount = UserAccount.getJSONUserAccount(this);
                //login using the JSON
        userLogin(mUserAccount);
    }



    public void userLogin(final JSONObject mUserAccount) {
        Thread t = new Thread() {
            public void run() {
                String uri = URL + ENDPOINT + "user/login";
                HttpPost httppost = new HttpPost(uri);
                httppost.setHeader("Content-type", "application/json");
                StringEntity se;
                try {
                    HttpClient mHttpClient = new DefaultHttpClient();
                    HttpParams mHttpParams = new BasicHttpParams();
                    HttpConnectionParams.setConnectionTimeout(mHttpParams,
                            10000);
                    HttpConnectionParams.setSoTimeout(mHttpParams, 10000);

                    se = new StringEntity(mUserAccount.toString());
                    se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
                            "application/json"));
                    httppost.setEntity(se);
                    Log.d("STATUS", "CALLING DRUPAL");
                    ResponseHandler<String> handler = new BasicResponseHandler();
                    mResponse = mHttpClient.execute(httppost, handler);
                    mHttpClient.getConnectionManager().shutdown();


                    Log.d("STATUS", "LOGIN COMPLETE");
                    Log.d("RESPONSE", mResponse);

                } catch (UnsupportedEncodingException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (ClientProtocolException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        };
        t.run();
    }
}

用户帐户方法..我认为这甚至不是问题的一部分。

public static JSONObject getJSONUserAccount(Context ctx) {
        SharedPreferences accountSettings = PreferenceManager
                .getDefaultSharedPreferences(ctx);
        String nUsername = accountSettings.getString("username", "tester");
        String nPassword = accountSettings.getString("password", "password");
        JSONObject JSONUser = new JSONObject();
        try {
            JSONUser.put("password", nPassword);
            JSONUser.put("username", nUsername);
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return JSONUser;
    }

日志是..

07-05 10:34:58.377: E/AndroidRuntime(32538): FATAL EXCEPTION: main
07-05 10:34:58.377: E/AndroidRuntime(32538): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.seine.drupal/com.seine.drupal.DrupalTestActivity}: android.os.NetworkOnMainThreadException
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2049)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2083)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.app.ActivityThread.access$600(ActivityThread.java:134)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1233)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.os.Looper.loop(Looper.java:137)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.app.ActivityThread.main(ActivityThread.java:4697)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at java.lang.reflect.Method.invokeNative(Native Method)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at java.lang.reflect.Method.invoke(Method.java:511)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at dalvik.system.NativeStart.main(Native Method)
07-05 10:34:58.377: E/AndroidRuntime(32538): Caused by: android.os.NetworkOnMainThreadException
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1119)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at java.net.InetAddress.lookupHostByName(InetAddress.java:441)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:243)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at java.net.InetAddress.getAllByName(InetAddress.java:220)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:653)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at com.seine.drupal.DrupalTestActivity.userLogin(DrupalTestActivity.java:90)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at com.seine.drupal.DrupalTestActivity$1.run(DrupalTestActivity.java:65)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at com.seine.drupal.DrupalTestActivity.onCreate(DrupalTestActivity.java:69)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.app.Activity.performCreate(Activity.java:4539)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
07-05 10:34:58.377: E/AndroidRuntime(32538):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2013)
07-05 10:34:58.377: E/AndroidRuntime(32538):    ... 11 more

我很困惑，这一定是 ICS 中的新东西，因为这一切都适用于早期版本的 android。我真的被迫使用 AsyncTask 吗？我简直不敢相信。

Answer 1

您在线程对象上调用 run() 而不是 start()。调用 run() 只是在主线程上执行您的线程过程。

线走

t.run(); 

最后。应该是

t.start();