[英]how can i check my device is connected with internet or not
如何检查我的设备是否连接到互联网。
我有 android 设备,因为我启动了 wifi 数据,但该 wifi 数据用于本地网络,但它仍然显示您的互联网连接已打开,而实际上却没有。
那么我如何通过我检查来检查这个类的内部连接类
我会给你互联网连接检查的代码
public class NetworkUtil {
public static int TYPE_WIFI = 1;
public static int TYPE_MOBILE = 2;
public static int TYPE_NOT_CONNECTED = 0;
public static int getConnectivityStatus(Context context) {
if (Build.VERSION.SDK_INT >= 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
if (cm.getActiveNetworkInfo() != null && cm.getActiveNetworkInfo().isAvailable() && cm.getActiveNetworkInfo().isConnected()) {
return TYPE_WIFI;
} else {
return TYPE_NOT_CONNECTED;
}
}
public static String getConnectivityStatusString(Context context) {
int conn = NetworkUtil.getConnectivityStatus(context);
String status = null;
if (conn == NetworkUtil.TYPE_WIFI) {
status = "Wifi enabled";
} else if (conn == NetworkUtil.TYPE_MOBILE) {
status = "Mobile data enabled";
} else if (conn == NetworkUtil.TYPE_NOT_CONNECTED) {
status = "Not connected to Internet";
}
return status;
}
public static boolean isInternetWorking() {
boolean success = false;
try {
URL url = new URL("https://google.com");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(10000);
connection.connect();
success = connection.getResponseCode() == 200;
} catch (IOException e) {
e.printStackTrace();
}
return success;
}
}
请使用以下方法检查互联网连接。
private boolean isNetworkConnected() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo() != null;
}
0 表示没有互联网 1 表示互联网
private int checkInternetConnectivity() {
ConnectivityManager conMgr = (ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = conMgr.getActiveNetworkInfo();
if (netInfo == null) {
return 0;
} else {
return 1;
}
}
在课堂上使用这种方式
NetworkUtil networkUtil=new NetworkUtil(this)
if(networkUtil.isInternetWorking()){
Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, "Not Connected", Toast.LENGTH_SHORT).show();
}
您可以通过以下代码轻松检查 Internet 连接:
ConnectivityManager ConnectionManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = ConnectionManager.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected() ) {
//Connected
} else {
//Not connected
}
不要忘记在 Manifest 中声明权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
上课:-
public class ConnctionDetector
{
ConnectivityManager connectivityManager;
Context context;
NetworkInfo info;
public ConnctionDetector(Context context)
{
this.context=context;
}
public boolean checkin(Context context)
{
boolean flag = false;
try {
connectivityManager = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
info = connectivityManager.getActiveNetworkInfo();
if (info.getType() == ConnectivityManager.TYPE_WIFI)
{
System.out.println(info.getTypeName());
flag = true;
}
if (info.getType() == ConnectivityManager.TYPE_MOBILE)
{
System.out.println(info.getTypeName());
flag = true;
}
} catch (Exception exception) {
System.out.println("Exception at network connection....."
+ exception);
}
return flag;
}
}
以及如何检查:-
boolean checkconnection = new
ConnctionDetector(getApplicationContext()).checkin(getApplicationContext());
if (!checkconnection) {
Toast.makeText(getApplicationContext(), "No Internet
Connection", Toast.LENGTH_SHORT).show();
}
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