Android异常 java.lang.IllegalStateException解决方法

Rachel ·

更新时间:2024-11-13

· 810 次阅读

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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java.lang lang JAVA 方法 Android

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