android4.0 HttpClient 以后不能在主线程发起网络请求

android4.0以后不能在主线程发起网络请求，该异步网络请求。

new Thread(new Runnable()

{

@Override

public void run()

{

// TODO Auto-generated method stub

gethttp();

}

}).start(); //这段代码在主线程中调用，开启一个线程

public void gethttp()

{

String addr = "", name = "";

StringBuilder stringBuilder = new StringBuilder();

String urlString = "";

if (chkbd.isChecked() == true)

{

urlString = String

.format("http://api.map.baidu.com/geocoder/v2/?ak=bjj7HFkUUoHs07rnVNM07TQg&coordtype="

+ "bd09ll"

+ "&callback=renderReverse&location="

+ latlng[0]

+ ","

+ latlng[1]

+ "&output=json&pois=1");

} else

{

urlString = String

.format("http://api.map.baidu.com/geocoder/v2/?ak=bjj7HFkUUoHs07rnVNM07TQg&coordtype="

+ "wgs84ll"

+ "&callback=renderReverse&location="

+ latlng[0]

+ ","

+ latlng[1]

+ "&output=json&pois=1");

}

Log.i(TAG, "latitude:" + latlng[0] + " longitude:" + latlng[1]);

/** 这里采用get方法，直接将参数加到URL上 */

Log.i(TAG, urlString);

/** 新建HttpClient */

HttpClient client = new DefaultHttpClient();

/** 采用GET方法 */

HttpGet get = new HttpGet(urlString);

try

{

/** 发起GET请求并获得返回数据 */

Log.i(TAG, "发起GET请求并获得返回数据");

Log.e(TAG, "ces1");

HttpResponse response = client.execute(get);

int code = response.getStatusLine().getStatusCode();// 返回响应码

Log.e(TAG, "响应码code=" + code);

HttpEntity entity = response.getEntity();

BufferedReader buffReader = new BufferedReader(

new InputStreamReader(entity.getContent()));

StringBuffer strBuff = new StringBuffer();

String result = null;

while ((result = buffReader.readLine()) != null)

{

strBuff.append(result);

}

/** 解析JSON数据，获得物理地址 */

// Log.i(TAG, "解析JSON数据，获得物理地址"+strBuff+" oo");

int indexAdd1 = 0, indexAdd2 = 0, indexAdd3 = 0, indexAdd4 = 0;

indexAdd1 = strBuff.indexOf("status", 1);

Log.i(TAG, "indexAdd1=" + indexAdd1);

String status = strBuff.substring(indexAdd1 + 8, indexAdd1 + 9);

Log.i(TAG, "status=" + status);

if (strBuff != null && strBuff.length() > 0 && status.equals("0"))

{

indexAdd1 = strBuff.indexOf("formatted_address", 1);

indexAdd2 = strBuff.indexOf("pois", indexAdd2);

indexAdd1 = strBuff.indexOf("addr", indexAdd2);

while (indexAdd1 > 1)

{

Log.i(TAG, "indexAdd1=" + indexAdd1 + " indexAdd2="

+ indexAdd2);

indexAdd2 = strBuff.indexOf("cp", indexAdd1);

addr = strBuff.substring(indexAdd1 + "addr".length() + 3,

indexAdd2 - 3);

stringBuilder.append("地址：" + addr);

indexAdd3 = strBuff.indexOf("name", indexAdd2);

indexAdd4 = strBuff.indexOf("poiType", indexAdd3);

name = strBuff.substring(indexAdd3 + "addr".length() + 3,

indexAdd4 - 3);

stringBuilder.append(" 名称：" + name + "\n");

indexAdd1 = strBuff.indexOf("addr", indexAdd4);

Log.e(TAG, "addr=" + addr + "\nname=" + name);

}

;

} else if (status.equals("1"))

{

stringBuilder.append("百度服务器错误");

} else if (status.equals("21"))

{

stringBuilder.append("from非法");

} else if (status.equals("22"))

{

stringBuilder.append("to非法");

} else

{

stringBuilder.append("coords非法");

}

} catch (Exception e)

{

Log.i(TAG, "获取物理位置出现错误" + e.getMessage());

} finally

{

get.abort();

// stringBuilder=null;

client = null;

}

Log.i(TAG, "JSON:" + stringBuilder.toString());

// 1、实例化一个Message对象

Message message = Message.obtain();

// 将图片流赋值给Message对象

message.obj = stringBuilder.toString();

// 定义标签

message.what = 0;

// 3、发送消息到主线程中的Handler

mHandler.sendMessage(message);

}

// 2、在主线程中实例化Handler对象

Handler mHandler = new Handler()

{

@Override

public void handleMessage(Message msg)

{

// TODO Auto-generated method stub

super.handleMessage(msg);

// 4、接收消息并执行UI的更新操作

if (msg.obj != null)

{

showText.setText((String) msg.obj);

} else

{

Log.i(TAG, "不能读取到网络信息!");

}

}

};