修改网络获取，无网络判断

@@ -133,10 +133,15 @@ export class NetworkManager {
    * 同步获取网络类型，耗时
    */
   public getNetTypeSync(): NetworkType {
+    try {
       let netHandle = connection.getDefaultNetSync();
       let netCapabilities = connection.getNetCapabilitiesSync(netHandle)
       this.reset(netCapabilities.bearerTypes)
       return this.networkType;
+    } catch (e) {
+      Logger.error(TAG, 'getNetTypeSync e: ' + JSON.stringify(e))
+    }
+    return NetworkType.TYPE_UNKNOWN
   }
 
   private parseData(data: connection.NetCapabilityInfo) {

@@ -43,7 +43,7 @@ export class NetworkUtil {
    */
   static isNetConnected(): boolean {
     let type = NetworkManager.getInstance().getNetType()
-    if (type == NetworkType.TYPE_NONE) {
+    if (type == NetworkType.TYPE_UNKNOWN || type == NetworkType.TYPE_NONE) {
       return false
     }
     return true