以下是我的问题: 我从服务器获取一系列值。 这些值填充了UI中的ListView。 直到列表被填满,我才能继续加载View并向用户显示它。 由于Android强制要求我在单独的线程中进行http调用,我的问题是如何创建一个类来执行http请求,在调用类中等待直到我得到HttpRequest的响应后,才继续加载View? 现在我有一个执行请求的类:
public class WapConnector extends AsyncTask<String, String, String>{
private static final String TAG = "WapConnector";
private String html = "";
private Handler mHandler;
private String server = "http://....whatever";
private String callUrl = "/api/";
private String params = "login?u=Admin&pw=234234&format=json";
private int _callstate = 1;
@Override
protected String doInBackground(String... uri) {
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response;
String responseString = null;
try {
String fullUrl = "";
Log.i(TAG,fullUrl);
if(params.length() > 0){
fullUrl = server + callUrl + params + "&alf_ticket=" + Globals.getInstance().getTicket() + "&udid=" + Globals.getInstance().udid() + "&phoneNumber=" + Globals.getInstance().phoneNumber();
}
else{
fullUrl = server + callUrl + "?udid=" + Globals.getInstance().udid() + "&alf_ticket=" + Globals.getInstance().getTicket() + "&phoneNumber=" + Globals.getInstance().phoneNumber();
}
Log.i(TAG,fullUrl);
response = httpclient.execute(new HttpGet(fullUrl));
StatusLine statusLine = response.getStatusLine();
if(statusLine.getStatusCode() == HttpStatus.SC_OK){
ByteArrayOutputStream out = new ByteArrayOutputStream();
response.getEntity().writeTo(out);
out.close();
responseString = out.toString();
Log.i(TAG,responseString);
} else{
//Closes the connection.
response.getEntity().getContent().close();
throw new IOException(statusLine.getReasonPhrase());
}
} catch (ClientProtocolException e) {
e.printStackTrace();
//TODO Handle problems..
} catch (IOException e) {
//TODO Handle problems..
e.printStackTrace();
}
return responseString;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
Log.i(TAG + "onPostExecute",result);
activity.getClass().handleResponse();
//main load
JSONObject jobj;
JSONObject jvalue;
try {
jobj = new JSONObject(result);
if(_callstate == 1){
jvalue = jobj.getJSONObject("data");
String ticket = jvalue.getString("ticket");
Log.i("loginwap",ticket);
Globals.getInstance().setTicket(ticket);
_callstate = 2;
}
else{
jvalue = jobj.getJSONObject("countries");
JSONArray countries = jvalue.getJSONArray("countries");
}
}
catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
这是我从父类中调用函数的方法:
WapConnector wap = new WapConnector();
wap.setCallUrl("/anyurl/");
wap.callstate(3);
wap.setParams("");
wap.execute("");
现在我的问题是,由于请求在线程中运行,一旦我调用wap.execute(),我的Activity就会继续加载,但我希望它等待直到我收到响应,解析响应然后才继续加载。
感谢大家的回复!!!