Android - HttpURLConnection 拋出異常

HttpURLConnection 拋出異常

 

Http的URL鏈接, 會發生錯誤, 主要原因是 在主UI線程中, 使用網絡調用(network call), 就拋出NetworkOnMainThreadException異常.

版本: API level 11以上.

可以使用一個簡單的線程, 在後台(asynctask)調用程序, 可以避免此情況;

否則 在getResponseCode()函數處, 拋出異常.

Android API : http://developer.android.com/reference/android/os/AsyncTask.html.

 

代碼:

 

            String quakeFeed = getString(R.string.quake_feed);
            url = new URL(quakeFeed);

            URLConnection connection;
            connection = url.openConnection();

            HttpURLConnection httpConnection = (HttpURLConnection)connection;
            int responseCode = httpConnection.getResponseCode();

修改:

 

 

        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                refreshEarthquakes();
            }
        });

        t.start();

即, 把需要網絡調用(network call)的程序, 放入線程(thread)中執行.