यह केवल जाँचता है कि नेटवर्क इंटरफ़ेस उपलब्ध है या नहीं, किसी विशेष नेटवर्क सेवा की गारंटी नहीं है, उदाहरण के लिए, निम्न संकेत या सर्वर डाउनटाइम हो सकता है
private boolean isNetworkInterfaceAvailable(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return activeNetwork != null && activeNetwork.isConnectedOrConnecting();
}
यदि आप यह सुनिश्चित करना चाहते हैं कि आपका कनेक्शन किसी सर्वर या किसी url से डेटा एकत्र कर सके तो यह सुनिश्चित करें:
private boolean isAbleToConnect(String url, int timeout) {
try {
URL myUrl = new URL(url);
URLConnection connection = myUrl.openConnection();
connection.setConnectTimeout(timeout);
connection.connect();
return true;
} catch (Exception e) {
Log.i("exception", "" + e.getMessage());
return false;
}
}
इस फ़ंक्शन को पृष्ठभूमि थ्रेड में लपेटने की आवश्यकता है:
final String action = intent.getAction();
if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
checkConnectivity(context);
}
}
private void checkConnectivity(final Context context) {
if (!isNetworkInterfaceAvailable(context)) {
Toast.makeText(context, "You are OFFLINE!", Toast.LENGTH_SHORT).show();
return;
}
final Handler handler = new Handler();
new Thread(new Runnable() {
@Override
public void run() {
final boolean isConnected = isAbleToConnect("http://www.google.com", 1000);
handler.post(new Runnable() {
@Override
public void run() {
if (isConnected)
Toast.makeText(context, "You are ONLINE!", Toast.LENGTH_SHORT).show();
else
Toast.makeText(context, "You are OFFLINE!", Toast.LENGTH_SHORT).show();
}
});
}
}).start();
}
आवश्यक अनुमतियाँ जोड़ें:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET"/>
मेनिफ़ेस्ट फ़ाइल में एप्लिकेशन के तहत इस लाइन को जोड़ें:
android:usesCleartextTraffic="true"
प्रकट फ़ाइल में रिसीवर जोड़ें:
<receiver android:name=".ConnectivityChangeReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
आप गतिविधि में बीआर को पंजीकृत / अपंजीकृत करें:
@Override
protected void onStart() {
super.onStart();
IntentFilter filter = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
registerReceiver(connectivityChangeReceiver, filter);
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(connectivityChangeReceiver);
}
यह संपूर्ण प्रसारण वर्ग है:
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Handler;
import android.util.Log;
import android.widget.Toast;
import java.net.URL;
import java.net.URLConnection;
public class ConnectivityChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, final Intent intent) {
final String action = intent.getAction();
if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
checkConnectivity(context);
}
}
private void checkConnectivity(final Context context) {
if (!isNetworkInterfaceAvailable(context)) {
Toast.makeText(context, "You are OFFLINE!", Toast.LENGTH_SHORT).show();
return;
}
final Handler handler = new Handler();
new Thread(new Runnable() {
@Override
public void run() {
final boolean isConnected = isAbleToConnect("http://www.google.com", 1000);
handler.post(new Runnable() {
@Override
public void run() {
if (isConnected)
Toast.makeText(context, "You are ONLINE!", Toast.LENGTH_SHORT).show();
else
Toast.makeText(context, "You are OFFLINE!", Toast.LENGTH_SHORT).show();
}
});
}
}).start();
}
//This only checks if the network interface is available, doesn't guarantee a particular network service is available, for example, there could be low signal or server downtime
private boolean isNetworkInterfaceAvailable(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return activeNetwork != null && activeNetwork.isConnectedOrConnecting();
}
//This makes a real connection to an url and checks if you can connect to this url, this needs to be wrapped in a background thread
private boolean isAbleToConnect(String url, int timeout) {
try {
URL myUrl = new URL(url);
URLConnection connection = myUrl.openConnection();
connection.setConnectTimeout(timeout);
connection.connect();
return true;
} catch (Exception e) {
Log.i("exception", "" + e.getMessage());
return false;
}
}
}