android - 代码在 Jelly Beans 中不起作用

Question

我有这段代码从 url 返回 Json 对象。它在 froyo 中工作正常，但相同的代码在 Jelly Beans 中不起作用。

我的代码有问题吗？

请帮帮我，这是我的代码

    public static JSONObject getJSONfromURL(String url) {

    // initialize
    InputStream is = null;
    String result = "";
    JSONObject jArray = null;

    // http post
    try {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(url);
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();

    } catch (Exception e) {
        Log.e("log_tag", "Error in http connection " + e.toString());
    }

    // convert response to string
    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        result = sb.toString();
    } catch (Exception e) {
        Log.e("log_tag", "Error converting result " + e.toString());
    }

    // try parse the string to a JSON object
    try {
        jArray = new JSONObject(result);
    } catch (JSONException e) {
        Log.e("log_tag", "Error parsing data " + e.toString());
    }

    return jArray;
}

这是我的日志错误

11-01 11:01:48.437: E/log_tag(1044): http 连接错误 android.os.NetworkOnMainThreadException
11-01 11:01:48.437: E/log_tag(1044): 错误转换结果 java.lang.NullPointerException
11-01 11:01:48.437: E/log_tag(1044): 解析数据时出错 org.json.JSONException: 在

的字符 0 输入结束

Answer 1

从 Android API v15 开始，它不需要在主线程上运行繁重的进程。所以你应该将你的逻辑移动到另一个线程，比如下面的源代码:

new Thread(new Runnable() {
   public void run() {
        // your logic
   }                        
}).start();

更多信息请引用 http://developer.android.com/guide/practices/responsiveness.html