android 判断是否有导航栏 android判断是否有网络

在开发的时候，往往会遇到在获取数据的时候，突然就把网络关闭的情况，如果后天没有写完善的话，就会直接出去crash。所以在请求的时候很有必要做好用户友好化。

今天和大家分享下android网络的判断：

1.判断是否有网络：

 

<span >	</span>public boolean validateInternet() {
		ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
		if (manager == null) {
			return false;
		} else {
			NetworkInfo[] info = manager.getAllNetworkInfo();
			if (info != null) {
				for (int i = 0; i < info.length; i++) {
					if (info[i].getState() == NetworkInfo.State.CONNECTED) {
						return true;
					}
				}
			}
		}
		return false;
	}

 注：别忘了添加权限 

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>  

2.判断是否为WiFi网络  

   public static boolean isWifiActive(Context icontext){
           Context context = icontext.getApplicationContext();    
           ConnectivityManager connectivity = (ConnectivityManager) context    
                   .getSystemService(Context.CONNECTIVITY_SERVICE);
           NetworkInfo[] info;
           if (connectivity != null) {    
               info = connectivity.getAllNetworkInfo();    
               if (info != null) {    
                  for (int i = 0; i < info.length; i++) {    
                     if (info[i].getTypeName().equals("WIFI") && info[i].isConnected()) {    
                          return true;    
                      }    
                  }    
              }    
         }    
          return false;   
     }

3.判断是否为3g网络

public static boolean is3G(Context context) {
         ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
         NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
         if (activeNetInfo != null && activeNetInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
             return true;
         }
         return false;
     }