Android异常： java.lang.IllegalStateException

详情

这种异常我遇到以下两种情况：
1. java.lang.IllegalStateException: No wrapped connection.
2.java.lang.IllegalStateException: Adapter is detached.

原因：

1.单线程一次执行一个请求可以正常执行，如果使用多线程，同时执行多个请求时就会出现连接超时.
2.HttpConnection没有连接池的概念，多少次请求就会建立多少个IO，在访问量巨大的情况下服务器的IO可能会耗尽。
3.通常是因为HttpClient访问单一实例的不同的线程或未关闭InputStream的httpresponse。

解决方案：获得httpclient线程安全

解决前代码：

public HttpClient httpClient = new DefaultHttpClient();
 public void postNoResult(final Context context, final String url, final Map maps, final String show) {
        new Thread() {
            @Override
            public void run() {
                try {
                    HttpPost post = new HttpPost(url);
                    List params = new ArrayList();
                    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();
    }

解决后代码：

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 maps, final String show) {
        new Thread() {
            @Override
            public void run() {
                try {
                    HttpPost post = new HttpPost(url);
                    List params = new ArrayList();
                    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();
    }