Android Activity MainThread 中不能执行http通信解决办法

MikyTan — Thu, 11 Jul 2013 02:51:00 GMT

今天在做��ȝ��文�g传输时。用HTTP上传文�g。程序一�q�行　报如下的错误

android.os.NetworkOnMainThreadException

原因是Google�?开始，强制默认��止UI�ȝ��E�发起通信��h��　

解决办法�Q?strong>

把通信的代码�{�U�d��子线�E�里��d��Q?比较靠谱的是new一个AyncTask�Q�在里面做通信

有几个细节性的问题是，

�W�一�Q?一般原有通信的代码都是共通的API�Q?被许多个Activity调用�Q?一个良好的修改�Ҏ��是在共通API里面new AyncTask

�W�二�Q?通信的API一般来说都是同步的�Q?你通信�Q�然后画面主�U�程需要堵塞住�Q�等待API的通信�l�果�Q�再军_��下面的业务逻辑的走向�?/strong>

所以，�q�块可以采取 AyncTask.get()�Q?让主�U�程堵塞�Q�直到通信�l�束�?当然�Q�如果你需要将通信异步的话�Q?可以用Handler机制来解�?br />

具体调用代码如下�Q�HTTP�?/strong>

步请�?br />
package com.qqtech.ucstar.utils;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;

import android.os.AsyncTask;

public class HttpReqTask extends AsyncTask<Object, Object, HttpResponse> {

@Override
protected HttpResponse doInBackground(Object arg0) {
String fileUploadUrl = (String) arg0[0];
String streamid = (String) arg0[1];
File file = (File) arg0[2];
//boolean paramBoolean = Boolean.parseBoolean((String) arg0[3]);
//String paramString3 = (String) arg0[4];
HttpClient localHttpClient = new DefaultHttpClient();
//String str1 = "fileName";
File localFile = file;
try {
if ((localFile == null) || (!localFile.exists()))
throw new IOException("文�g不存�?" + localFile);
} catch (IOException e1) {
e1.printStackTrace();
}
HttpPost localPostMethod = new HttpPost(fileUploadUrl+"?streamid="+streamid+"&fileencode=UTF-8");
//MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE,null, Charset.forName("UTF-8"));
try {
FileBody bin = new FileBody(file);
reqEntity.addPart("file", bin);
localPostMethod.setEntity(reqEntity);
HttpResponse response = localHttpClient.execute(localPostMethod);
return response;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

}

调用代码如下�Q?br />

Object[] param = new Object[5];
     param[0] = answer.getUploadURL();
     param[1] = answer.getStreamid();
     param[2] = new File(answer.getFileURL());
     param[3] = "false";
     param[4] = "";
     AsyncTask res = new HttpReqTask().execute(param);
     HttpResponse rep = null;
     rep = (HttpResponse) res.get();
     if (rep.getStatusLine().getStatusCode() == 200) {
      System.out.println("文�g上传成功");
     }else{
      System.out.println("文�g上传��p�|");
     }
    }

MikyTan 2013-07-11 10:51 发表评论

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Android Activity MainThread 中不能执行http通信解决办法

修改模拟器DNS�Ҏ��