Android异常 java.lang.IllegalStateException解决方法

2019-12-12 04:34:33

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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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