Android异常详情介绍

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<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(); }

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<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(); }

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