[英]Bad or no internet connection checker
im trying to implement for my app offline mode. 即时尝试实现我的应用程序离线模式。 I found some codes on SO First time i was using
我在第一次使用时发现了一些代码
public static boolean CheckConnection() {
boolean haveConnectedWifi = false;
boolean haveConnectedMobile = false;
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[] netInfo = cm.getAllNetworkInfo();
for (NetworkInfo ni : netInfo) {
if (ni.getTypeName().equalsIgnoreCase("WIFI"))
if (ni.isConnected())
haveConnectedWifi = true;
if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
if (ni.isConnected())
haveConnectedMobile = true;
}
return haveConnectedWifi || haveConnectedMobile;
}
This function called every 1-3 seconds in service. 此功能每1-3秒就会调用一次。 and this part work if we realy set off wifi or 3g/4g .
如果我们真的启动wifi或3g / 4g这部分工作。 But if we connected to wifi and wifi dont have access to internet than this code also return (internet ok)
但是,如果我们连接到wifi和wifi没有访问互联网比这个代码也返回(互联网确定)
I found another way .. look like good . 我找到了另一种方式..看起来很好。 BUT
但
public boolean isOnline() {
try {
HttpURLConnection httpURLConnection = (HttpURLConnection)(new URL("http://www.google.com").openConnection());
httpURLConnection.setRequestProperty("User-Agent", "Test");
httpURLConnection.setRequestProperty("Connection", "close");
httpURLConnection.setConnectTimeout(10000);
httpURLConnection.connect();
return (httpURLConnection.getResponseCode() == 200);
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
but what about : if i will use this code every 1-2 seconds in service (i have service which checking internet connections ). 但是,如果我将每1-2秒使用此代码(我有检查互联网连接的服务)。 Its bad or no ?
它的坏或不好? Can any answer.
可以回答。 Regard Peter.
彼得。
Everything will be covered if you use this class: 如果您使用此课程,将会涵盖所有内容:
public class Connectivity {
public static NetworkInfo getNetworkInfo(Context context){
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo();
}
public static boolean isConnected(Context context){
NetworkInfo info = Connectivity.getNetworkInfo(context);
return (info != null && info.isConnected());
}
public static boolean isConnectedWifi(Context context){
NetworkInfo info = Connectivity.getNetworkInfo(context);
return (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_WIFI);
}
public static boolean isConnectedMobile(Context context){
NetworkInfo info = Connectivity.getNetworkInfo(context);
return (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_MOBILE);
}
public static boolean isConnectedFast(Context context){
NetworkInfo info = Connectivity.getNetworkInfo(context);
return (info != null && info.isConnected() && Connectivity.isConnectionFast(info.getType(),info.getSubtype()));
}
public static boolean isConnectionFast(int type, int subType){
if(type== ConnectivityManager.TYPE_WIFI){
return true;
}else if(type==ConnectivityManager.TYPE_MOBILE){
switch(subType){
case TelephonyManager.NETWORK_TYPE_1xRTT:
return false; // ~ 50-100 kbps
case TelephonyManager.NETWORK_TYPE_CDMA:
return false; // ~ 14-64 kbps
case TelephonyManager.NETWORK_TYPE_EDGE:
return false; // ~ 50-100 kbps
case TelephonyManager.NETWORK_TYPE_EVDO_0:
return true; // ~ 400-1000 kbps
case TelephonyManager.NETWORK_TYPE_EVDO_A:
return true; // ~ 600-1400 kbps
case TelephonyManager.NETWORK_TYPE_GPRS:
return false; // ~ 100 kbps
case TelephonyManager.NETWORK_TYPE_HSDPA:
return true; // ~ 2-14 Mbps
case TelephonyManager.NETWORK_TYPE_HSPA:
return true; // ~ 700-1700 kbps
case TelephonyManager.NETWORK_TYPE_HSUPA:
return true; // ~ 1-23 Mbps
case TelephonyManager.NETWORK_TYPE_UMTS:
return true; // ~ 400-7000 kbps
case TelephonyManager.NETWORK_TYPE_EHRPD: // API level 11
return true; // ~ 1-2 Mbps
case TelephonyManager.NETWORK_TYPE_EVDO_B: // API level 9
return true; // ~ 5 Mbps
case TelephonyManager.NETWORK_TYPE_HSPAP: // API level 13
return true; // ~ 10-20 Mbps
case TelephonyManager.NETWORK_TYPE_IDEN: // API level 8
return false; // ~25 kbps
case TelephonyManager.NETWORK_TYPE_LTE: // API level 11
return true; // ~ 10+ Mbps
// Unknown
case TelephonyManager.NETWORK_TYPE_UNKNOWN:
default:
return false;
}
}else{
return false;
}
}
}
check Internet Connection: 检查Internet连接:
private Boolean isInternetPresent = false;
isInternetPresent =isConnectingToInternet() ;
if(isInternetPresent){
}else{}
public boolean isConnectingToInternet() {
ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null)
for (int i = 0; i < info.length; i++)
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
return false;
}
You could try using a simple InetAddress
, like this: 您可以尝试使用简单的
InetAddress
,如下所示:
public boolean isOnline() {
try {
InetAddress.getByName("www.google.com");
return true;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
This may draw less resources off your device. 这可能会减少您设备上的资源。
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