问题描述
public class getString {
String tag_string_req = "string_raq";
String url = "http://10.0.2.2/eat/locations/index.json";
String result="";
public String get_String() {
StringRequest strReq = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
result=response;
System.out.println(response);
;
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
System.out.println(volleyError.getMessage());
}
});
AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
return result;
}}
我想打造的getString的对象,并调用get_String其他领域。但似乎很难从onResponse得到的结果出来。我知道它不能在当前的方式工作。谁能帮我解决这个问题呢?
I would to build an object of getString and call get_String in other fields. But it seems that it is hard to get the result out from the onResponse. I know it cannot work in this current way. Could anyone help me to settle this problem?
推荐答案
您想要使用的回调接口,像这样:
You want to use callback interfaces like so:
public String get_String(VolleyCallback callback) {
StringRequest strReq = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
result=response;
callback.onSuccess(result);
}
}...
}}
public interface VolleyCallback{
void onSuccess(String result);
}
内活动实例code:
Example code inside activity:
public void onResume(){
super.onResume();
getString(new VolleyCallback(){
@Override
public void onSuccess(String result){
... //do stuff here
}
});
}
您还可以VolleyCallback更强劲,使用泛型类型,如果你想要做的处理,或添加的start(),失败(例外五),完成()等方法,以做一些更细致的状态检查。
You can also make VolleyCallback more robust, using generic types if you want to do processing, or adding start(), failed(Exception e), complete(), etc methods to do a little more fine-grained state checking.
请记住,这是一个异步调用,所以你将有更新的观点,等等,当你得到的结果回来(成功()内)。
Keep in mind this is an async call, so you will have to update views, etc when you get the result back (inside success()).
这篇关于如何从抽射功能onResponse返回值?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!