Android中的`isConnected（）`和`isAvailable（）```NetworkInfo`

我試圖檢查設備是否連接到互聯網。我有以下的實施做Android中的`isConnected（）`和`isAvailable（）```NetworkInfo`

public static boolean isConnectedToNetwork(Context context) { 
    ConnectivityManager connectivityManager = 
    (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); 
    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo(); 
    return activeNetworkInfo != null && activeNetworkInfo.isConnected(); 
}

NetworkInfo提供了兩種方法isConnected()和isAvailable()。我應該使用哪一個，它們之間有什麼區別。

有沒有一種方法來檢測設備連接到Wifi沒有互聯網連接的狀態？

來源

2017-02-24 arjun

你檢查的[文件]（https://developer.android.com/reference/android/net/NetworkInfo.html）？ – aandis

你做得對。在嘗試建立連接之前，您應該調用'isConnected（）' –

@aandis yes我做了'isConnected（）' - 表示網絡連接是否存在isAvailable（）表示網絡連接是否可能。兩者看起來一樣。需要知道確切的區別和用法 – arjun

如果設備連接到網絡，isConnected返回true。如果設備未連接但網絡可用於連接，則isAvailable返回true，isConnected返回false。

您可以閱讀本主題以查找最後一個問題。 Android Check if there is WiFi but no internet

來源

2017-02-24 13:56:54 HKB

isConnected() 

Indicates whether network connectivity exists and it is possible to establish connections and pass data. 

- Always call this before attempting to perform data transactions. 

isAvailable() 

Indicates whether network connectivity is possible. A network is unavailable when a persistent or semi-persistent condition prevents the possibility of connecting to that network. Examples include 

- The device is out of the coverage area for any network of this type. 

- The device is on a network other than the home network (i.e., roaming), and data roaming has been disabled. 

- The device's radio is turned off, e.g., because airplane mode is enabled.

Reference Link

來源

2017-02-24 16:20:15

Android中的`isConnected（）`和`isAvailable（）```NetworkInfo`

回答

相關問題