Question

因此，当我尝试运行以下代码时，我永远无法通过响应行。我究竟做错了什么？我在我的清单文件中允许访问Internet。我必须遗漏一些巨大的东西，因为我已经看到了大约100个类似的例子，它们与我的代码完全相同。我甚至建立了示例项目只是为了运行这几行而且它们都以相同的方式运行。请帮助（最终目标是使这个工作与https一起工作，但任何进展使它与http一起使用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)

Answer 1

完美，这就是我想要的。查找NetworkOnMainThreadException，我们得到this page。这意味着您无法在应用程序的主线程上运行HTTP请求，但仅限于目标Honeycomb。

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，或者说是Jellybean。另一种解决方法是设置AsyncTask来运行HTTP请求。

如果您可以定位其他Android版本，请执行此操作。如果没有，我可以帮助你解决AsyncTask问题。但是，请记住，他们高度推荐您不在主线程上运行网络请求。

至于AsyncTasks，转弯的最佳位置始终是Android documentation。

基本思想是扩展AsyncTask类，这使您可以实现doInBackground方法。然后创建新类的实例，并调用execute（）。以下是文档中的代码段：

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);

HttpResponse不会工作

1 个答案: