global config add connect check timeout

Author: YangSen-qn

library/src/main/java/com/qiniu/android/http/connectCheck/ConnectChecker.java

@@ -93,7 +93,7 @@ public void complete(boolean isHostConnected) {
 
     private static void checkHost(final String host, final CheckCompleteHandler completeHandler) {
 
-        Request request = new Request(host, Request.HttpMethodHEAD, null, null, 3);
+        Request request = new Request(host, Request.HttpMethodHEAD, null, null, GlobalConfiguration.getInstance().connectCheckTimeout);
         SystemHttpClient client = new SystemHttpClient();
 
         LogUtil.i("== checkHost:" + host);

library/src/main/java/com/qiniu/android/storage/GlobalConfiguration.java

@@ -54,6 +54,11 @@ public class GlobalConfiguration {
      */
     public String[] connectCheckURLStrings = new String[]{"https://www.baidu.com", "https://www.google.com"};
 
+    /**
+     * 网络连接状态检测HEAD请求超时，默认：3s
+     */
+    public int connectCheckTimeout = 3;
+
     private static GlobalConfiguration configuration = new GlobalConfiguration();
 
     private GlobalConfiguration() {