Android异常 java.lang.IllegalStateException解决方法

public HttpClient httpClient = new DefaultHttpClient();
 public void postNoResult(final Context context, final String url, final Map<String, String> maps, final String show) {
  new Thread() {
   @Override
   public void run() {
    try {
     HttpPost post = new HttpPost(url);
     List<NameValuePair> params = new ArrayList<NameValuePair>();
     for (String key : maps.keySet()) {
      params.add(new BasicNameValuePair(key, maps.get(key)));
     }
     post.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
     HttpResponse response = httpClient.execute(post);//报错位置
     if (response.getStatusLine().getStatusCode() == 200) {
      Looper.prepare();
      String r = EntityUtils.toString(response.getEntity());
      ToastUtil.print_log(r);
      if (show != null) {
       ToastUtil.show(context, show);
      }
      Looper.loop();}
    } catch (UnsupportedEncodingException e) {
     e.printStackTrace();
    } catch (ClientProtocolException e) {
     e.printStackTrace();
    } catch (IOException e) {
     e.printStackTrace();
    }}}.start();
 }

public HttpClient httpClient = getThreadSafeClient();//获得httpclient线程安全。
public static DefaultHttpClient getThreadSafeClient() {
//获得httpclient线程安全的方法
  DefaultHttpClient client = new DefaultHttpClient();
  ClientConnectionManager mgr = client.getConnectionManager();
  HttpParams params = client.getParams();
  client = new DefaultHttpClient(new ThreadSafeClientConnManager(params,
    mgr.getSchemeRegistry()), params);
  return client;
 }

  public void postNoResult(final Context context, final String url, final Map<String, String> maps, final String show) {
  new Thread() {
   @Override
   public void run() {
    try {
     HttpPost post = new HttpPost(url);
     List<NameValuePair> params = new ArrayList<NameValuePair>();
     for (String key : maps.keySet()) {
      params.add(new BasicNameValuePair(key, maps.get(key)));
     }
     post.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
     HttpResponse response = httpClient.execute(post);//报错位置
     if (response.getStatusLine().getStatusCode() == 200) {
      Looper.prepare();
      String r = EntityUtils.toString(response.getEntity());
      ToastUtil.print_log(r);
      if (show != null) {
       ToastUtil.show(context, show);
      }
      Looper.loop();}
    } catch (UnsupportedEncodingException e) {
     e.printStackTrace();
    } catch (ClientProtocolException e) {
     e.printStackTrace();
    } catch (IOException e) {
     e.printStackTrace();
    }}}.start();
 }