如何檢查互聯網連接（Wifi /移動數據）是否已啟用？

Question

如何檢查互聯網連接在Android中是否已啟用？ 就像如果LOCATION SERVICE被禁用，我們使用該技術

Location myLocation = locationmanager.getLastKnownLocation(provider);
if(myLocation == null){
      Show the AlertDialog.
}else{
do this.
}

這樣，如何檢查Internet連接是否已啟用。

Answer 1

對於wifi：

ConnectivityManager mgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = mgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
connected = networkInfo != null && networkInfo.isConnected();

對於手機：

ConnectivityManager mgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = mgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
connected = networkInfo != null && networkInfo.isConnected();

Answer 2

您可以使用以下方法：

ConnectivityManager conectivtyManager = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);  
if (conectivtyManager.getActiveNetworkInfo() != null  
    && conectivtyManager.getActiveNetworkInfo().isAvailable()  
    && conectivtyManager.getActiveNetworkInfo().isConnected()) {  
    isConnected = true;  
} else {  
    isConnected= false;  
}  

希望能幫助到你！