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因此，当我尝试运行以下代码时，我永远无法超过响应行。我究竟做错了什么？我在清单文件中允许访问互联网。我一定遗漏了一些巨大的东西，因为我看到了大约 100 个与我具有完全相同代码的类似示例。我什至构建了示例项目来运行这几行代码，它们的行为方式都相同。请帮助（最终目标是使这项工作也与 https 一起工作，但任何进展使其与 http 一起工作对我来说已经足够了）

try{

                        HttpClient myHttpClient = new DefaultHttpClient();
                        HttpPost myHttpPost = new HttpPost("http://www.siirretytnumerot.fi/index.html?clientLanguage=eng");
                       //^Ive tried about 10 different sites (http and https) none of them work

                        //NEVER GETS PAST THE LINE BELOW, JUMPS TO THE LAST CATCH BLOCK OF THE EXCEPTION
                        HttpResponse response = myHttpClient.execute(myHttpPost);
                        //NEVER GETS PAST THE ABOVE LINE...

                        String data = EntityUtils.toString(response.getEntity());
                        json= new JSONObject(data);
                    //parse the JSONObject
                       } catch (UnsupportedEncodingException e){e.printStackTrace();}
                         catch (ClientProtocolException e){e.printStackTrace();}
                         catch (IOException e){e.printStackTrace();}
                         catch (JSONException e) {e.printStackTrace();}
                         catch (NullPointerException e){ Log.e("My APP", "exception: " + e.getMessage());}
                         catch (Exception e ) {Log.e("My APP", "exception", e);} 


10-17 15:31:41.423: E/My APP(974): exception
10-17 15:31:41.423: E/My APP(974): android.os.NetworkOnMainThreadException
10-17 15:31:41.423: E/My APP(974):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
10-17 15:31:41.423: E/My APP(974):  at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
10-17 15:31:41.423: E/My APP(974):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
10-17 15:31:41.423: E/My APP(974):  at java.net.InetAddress.getAllByName(InetAddress.java:220)
10-17 15:31:41.423: E/My APP(974):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
10-17 15:31:41.423: E/My APP(974):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
10-17 15:31:41.423: E/My APP(974):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
10-17 15:31:41.423: E/My APP(974):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
10-17 15:31:41.423: E/My APP(974):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
10-17 15:31:41.423: E/My APP(974):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-17 15:31:41.423: E/My APP(974):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-17 15:31:41.423: E/My APP(974):  at com.example.httpstuff.MainActivity$1.onClick(MainActivity.java:44)
10-17 15:31:41.423: E/My APP(974):  at android.view.View.performClick(View.java:3511)
10-17 15:31:41.423: E/My APP(974):  at android.view.View$PerformClick.run(View.java:14105)
10-17 15:31:41.423: E/My APP(974):  at android.os.Handler.handleCallback(Handler.java:605)
10-17 15:31:41.423: E/My APP(974):  at android.os.Handler.dispatchMessage(Handler.java:92)
10-17 15:31:41.423: E/My APP(974):  at android.os.Looper.loop(Looper.java:137)
10-17 15:31:41.423: E/My APP(974):  at android.app.ActivityThread.main(ActivityThread.java:4424)
10-17 15:31:41.423: E/My APP(974):  at java.lang.reflect.Method.invokeNative(Native Method)
10-17 15:31:41.423: E/My APP(974):  at java.lang.reflect.Method.invoke(Method.java:511)
10-17 15:31:41.423: E/My APP(974):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
10-17 15:31:41.423: E/My APP(974):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
10-17 15:31:41.423: E/My APP(974):  at dalvik.system.NativeStart.main(Native Method)
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1 回答 1

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完美，这就是我想要的。查找 NetworkOnMainThreadException，我们得到这个页面。这意味着您不能在应用程序的主线程上运行 HTTP 请求，但只能在以 Honeycomb 为目标时运行。

因此，解决此问题的最简单方法是针对不同的 Android 版本。也许是 2.3，或者到 Jellybean。另一种解决方法是设置一个 AsyncTask 来运行 HTTP 请求。

如果它适用于您针对不同的 Android 版本，请执行此操作。如果没有，我可以帮助您解决 AsyncTask。但是，请记住，他们强烈建议您不要在主线程上运行网络请求。

至于 AsyncTasks，最好的地方总是Android 文档。

基本思想是扩展 AsyncTask 类，这使您实现 doInBackground 方法。然后创建新类的实例，并调用 execute()。这是文档中的代码片段：

private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> {
    protected Long doInBackground(URL... urls) {
        int count = urls.length;
        long totalSize = 0;
        for (int i = 0; i < count; i++) {
            totalSize += Downloader.downloadFile(urls[i]);
            publishProgress((int) ((i / (float) count) * 100));
            // Escape early if cancel() is called
            if (isCancelled()) break;
        }
        return totalSize;
    }

    protected void onProgressUpdate(Integer... progress) {
        setProgressPercent(progress[0]);
    }

    protected void onPostExecute(Long result) {
        showDialog("Downloaded " + result + " bytes");
    }
}

new DownloadFilesTask().execute(url1, url2, url3);
于 2012-10-17T15:55:39.853 回答