土司AsyncTask的非活动类 [英] Toast in AsyncTask in non Activity class

问题描述

我有一个包含调用一个URL的AsyncTask的非活动类。
如果连接超时因为某些原因，我希望让用户知道这张贴敬酒。
但我就是不能让任何上下文。

如何achive呢？

RPIcall.class

 进口android.os.AsyncTask;
进口android.util.Log;进口org.apache.http.Htt presponse;
进口org.apache.http.client.ClientProtocolException;
进口org.apache.http.client.methods.HttpGet;
进口org.apache.http.conn.HttpHostConnectException;
进口org.apache.http.impl.client.DefaultHttpClient;
进口org.apache.http.params.BasicHttpParams;
进口org.apache.http.params.HttpConnectionParams;
进口org.apache.http.params.HttpParams;进口java.io.IOException异常;类RPicall扩展的AsyncTask＆LT;字符串，字符串，太虚＆GT; {    @覆盖
    保护无效doInBackground（字符串... URI）{        INT timeoutSocket = 3000;
        INT timeoutConnection = 3000;        尝试{            Log.v（电话网址：URI [0]）;            HTTPGET HTTPGET =新HTTPGET（URI [0]）;
            的HttpParams httpParameters =新BasicHttpParams（）;
            //直到建立连接以毫秒为单位设置超时。
            //默认值是零，这意味着未使用的超时。            HttpConnectionParams.setConnectionTimeout（httpParameters，timeoutConnection）;
            //设置默认的套接字超时（SO_TIMEOUT）
            //毫秒是用于等待数据的超时。            HttpConnectionParams.setSoTimeout（httpParameters，timeoutSocket）;            DefaultHttpClient的HttpClient =新DefaultHttpClient（httpParameters）;
            HTT presponse响应= httpClient.execute（HTTPGET）;        }赶上（ClientProtocolException E）{
            //这里连接超时excepion
            //Toast.makeText（你的连接已逾时，Toast.LENGTH_SHORT）.show（）;
            Log.v（服务器不可达，URI [0]）;
            publishProgress（超时）;        }赶上（HttpHostConnectException E）{            Log.e（服务器不可达，URI [0]）;        }        赶上（IOException异常五）{
            e.printStackTrace（）;
        }
        返回null;
    }    @覆盖
    保护无效onPostExecute（虚空结果）{
        super.onPostExecute（结果）;
        字符串测试=测试;
        Log.v（完了，测试）;    }
}
 

解决方案

步骤1：构造函数添加到 RPicall ，需要一个上下文，将其存储在数据成员。

第2步：使用上下文在 onPostExecute（）来显示你的吐司。

第三步：通过在合适的上下文当你创建一个实例 RPicall

。

I have a non Activity class which contains an AsyncTask which calls an URL. If the Connection Timeouts for some reasons, I want to let the user know this by posting a Toast. But I just can't get any Context.

How can achive this?

RPIcall.class

import android.os.AsyncTask;
import android.util.Log;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.HttpHostConnectException;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;

import java.io.IOException;

class RPicall extends AsyncTask<String, String, Void> {

    @Override
    protected Void doInBackground(String... uri) {

        int timeoutSocket       = 3000;
        int timeoutConnection   = 3000;

        try{

            Log.v("call URL: ", uri[0]);

            HttpGet httpGet = new HttpGet(uri[0]);
            HttpParams httpParameters = new BasicHttpParams();
            // Set the timeout in milliseconds until a connection is established.
            // The default value is zero, that means the timeout is not used. 

            HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
            // Set the default socket timeout (SO_TIMEOUT) 
            // in milliseconds which is the timeout for waiting for data.

            HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);

            DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
            HttpResponse response = httpClient.execute(httpGet);

        } catch (ClientProtocolException e) {
            //Here Connection TimeOut excepion
            //Toast.makeText(, "Your connection timedout", Toast.LENGTH_SHORT).show();
            Log.v("Server not Reachable: ", uri[0]);
            publishProgress("TimeOut");

        } catch (HttpHostConnectException e) {

            Log.e("Server not Reachable: ", uri[0]);

        }

        catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        String test = "test";
        Log.v("finished: ", test);

    }
}

解决方案

Step #1: Add a constructor to RPicall that takes a Context, storing it in a data member.

Step #2: Use that Context in onPostExecute() to display your Toast.

Step #3: Pass in a suitable Context when you create an instance of RPicall.

这篇关于土司AsyncTask的非活动类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IT屋！