我使用的是Android设备
我希望在应用启动时检查当前的网络状态。
所以,我试试这个。
ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERIVCE);
NetworkInfo ethernet = manager.getNetworkInfo(ConnectivityManager.TYPE_ETHERNET);
NetworkInfo wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if (wifi.isConnected()) {
Log.d(TAG, "WIFI isConnected");
} else if (ethernet.isConnected()) {
Log.d(TAG, "Ethernet isConnected");
} else if (wifi.isAvaiable()) {
Log.d(TAG, "Wifi not connect, but wifi isAvailable");
} else {
Log.d(TAG, "not available network");
}
此源检查Wi-Fi和以太网网络状态。
但无法联网时。不检查。
我的设备如果使用wifi,请在我的设备上连接无线局域网。
断开设备上的无线局域网。我的来源是检查wifi.isAvailable()
总之,
如何检查网络何时不可用(当前来源,当网络不可用时检查wifi.isAvailable)
关闭无线局域网和Wifi时,请检查wifi.isAvailable()
但是当关闭无线局域网和Wifi时,请检查wifi.isAvailable()
如何区分这种情况。
感谢。
答案 0 :(得分:0)
您应该使用getActiveNetworkInfo()来检查当前活动的默认数据网络的连接性 - 无需检查特定的数据网络;无论是以太网还是Wi-Fi。
$this->data->subject
答案 1 :(得分:0)
尝试此功能
public boolean isNetworkAvailable(Context context) {
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;
}
并像这样检查
if(isNetworkAvailable(this))
{
System.out.println(""Internet Connected);
}else
{
System.out.println(""Internet Not Connected);
}
答案 2 :(得分:0)
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(
Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
答案 3 :(得分:0)
了解正常工作的互联网状态使用此代码段
public static boolean isInternetAccess() {
try {
HttpURLConnection urlc = (HttpURLConnection)
(new URL("http://www.google.com")
.openConnection());
urlc.setRequestProperty("User-Agent", "Android");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(1500);
urlc.connect();
return (urlc.getResponseCode() == 200);
} catch (IOException e) {
Log.e(TAG, "Error checking internet connection", e);
}
return false;
}
如果此代码返回失败结果,则表示网络不可用,并调用您的代码以获取可用网络。
答案 4 :(得分:0)
您需要使用BroadcastReceiver进行检查连接。当状态改变时,它调用onReceive()方法。
public BroadcastReceiver internetConnectionReciever = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo activeNetInfo = connectivityManager
.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
@SuppressWarnings("static-access")
NetworkInfo activeWIFIInfo = connectivityManager
.getNetworkInfo(connectivityManager.TYPE_WIFI);
if (activeWIFIInfo.isConnected() || activeNetInfo.isConnected()) {
}
}
};
在onResume()中注册Receiver并在onDestroy()
中销毁它 @Override
protected void onResume() {
super.onResume();
registerReceiver(internetConnectionReciever, new IntentFilter(
"android.net.conn.CONNECTIVITY_CHANGE"));
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(internetConnectionReciever);
}
答案 5 :(得分:0)
public static boolean checkInternetConnection(Context context) {
try {
ConnectivityManager connec = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
android.net.NetworkInfo wifi = connec.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
android.net.NetworkInfo mobile = connec.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
android.net.NetworkInfo ethernet = connec.getNetworkInfo(ConnectivityManager.TYPE_ETHERNET);
if ((wifi != null && wifi.isConnected())
|| (mobile != null && mobile.isConnected())
|| (ethernet != null && ethernet.isConnected())) {
return true;
}
log("Connection", "Connection failed");
return false;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
return false;
}
}
使用此方法。你不需要检查wifi.isAvailable(),只需检查isConnected()
答案 6 :(得分:-1)
尝试此操作以在线或离线检查设备。
private boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()){
return true;
}else return false;
}