Android異常 java.lang.IllegalStateException解決方法

Android異常詳情介紹

這種異常我遇到以下兩種情況：
1. java.lang.IllegalStateException: No wrapped connection.
2.java.lang.IllegalStateException: Adapter is detached.

原因：

1.單線程一次執行一個請求可以正常執行，如果使用多線程，同時執行多個請求時就會出現連接超時.
2.HttpConnection沒有連接池的概念，多少次請求就會建立多少個IO，在訪問量巨大的情況下服務器的IO可能會耗盡。
3.通常是因為HttpClient訪問單一實例的不同的線程或未關閉InputStream的httpresponse。

解決方案：獲得httpclient線程安全

解決前代碼：

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);//報錯位置
     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();
 }

解決後代碼：

public HttpClient httpClient = getThreadSafeClient();//獲得httpclient線程安全。
public static DefaultHttpClient getThreadSafeClient() {
//獲得httpclient線程安全的方法
  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);//報錯位置
     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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