android.os.NetworkOnMainThreadException

                          有几个细节性的问题是，

                                第一， 一般原有通信的代码都是共通的API， 被许多个Activity调用， 一个良好的修改方法是在共通API里面new AyncTask

                               第二， 通信的API一般来说都是同步的， 你通信，然后画面主线程需要堵塞住，等待API的通信结果，再决定下面的业务逻辑的走向。

所以，这块可以采取 AyncTask.get()， 让主线程堵塞，直到通信结束。 当然，如果你需要将通信异步的话， 可以用Handler机制来解决


具体调用代码如下：HTTP异

步请求

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("文件不存在:" + 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;
}

}