小编Laz*_*ion的帖子

我试图从用户控件访问父窗口.

userControl1 uc1 = new userControl1();

mainGrid.Children.Add(uc1);

通过这段代码我加载userControl1到主网格.

但是当我点击里面的按钮userControl1然后我想加载另一个userControl2进入mainGrid主窗口的按钮？

这里我使用此代码加载Json.它与Android 2.2工作正常,但当我使用Android 4.2它抛出android.os.NetworkOnMainThreadException 异常请给我解决方案

 public class JSONParser {

    static InputStream is = null;

static JSONObject jObj = null;
static String json = "";

// constructor
public JSONParser() {

}

public JSONObject getJSONFromUrl(String url) {

    // Making HTTP request
    try {
        // defaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet httpPost = new HttpGet(url);

            HttpResponse getResponse = httpClient.execute(httpPost);
           final int statusCode = getResponse.getStatusLine().getStatusCode();

           if (statusCode != HttpStatus.SC_OK) { 
              Log.w(getClass().getSimpleName(), 
                  "Error " + statusCode + " for URL " + url); 
              return …