To check if your Android device is already connected to a Wi-Fi network, you can use the Android Connectivity Manager. Here’s how you can do it in Java:

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// Check if the device is connected to any network (Wi-Fi, mobile data, etc.)
boolean isConnected = isNetworkConnected(this);

if (isConnected) {
// Check if the device is connected to a Wi-Fi network
boolean isWifiConnected = isWifiConnected(this);

if (isWifiConnected) {
// Get information about the connected Wi-Fi network
WifiInfo wifiInfo = getWifiInfo(this);
String ssid = wifiInfo.getSSID(); // Get the SSID (name) of the network

// You can now use 'ssid' to get the name of the connected Wi-Fi network.
}
}
}

// Check if the device is connected to any network
private boolean isNetworkConnected(Context context) {
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = connectivityManager.getActiveNetworkInfo();
return activeNetwork != null && activeNetwork.isConnected();
}

// Check if the device is connected to a Wi-Fi network
private boolean isWifiConnected(Context context) {
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo wifiNetwork = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
return wifiNetwork != null && wifiNetwork.isConnected();
}

// Get information about the connected Wi-Fi network
private WifiInfo getWifiInfo(Context context) {
WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
return wifiManager.getConnectionInfo();
}
}

In this example:

  1. We use the ConnectivityManager to check if the device is connected to any network using the isNetworkConnected method.
  2. If the device is connected to a network, we then use the ConnectivityManager and WifiManager to check if it’s connected to a Wi-Fi network using the isWifiConnected method.
  3. If the device is connected to Wi-Fi, we use the getWifiInfo method to get information about the connected Wi-Fi network, including the SSID (name) of the network.

Make sure to add the necessary permissions in your AndroidManifest.xml file to access network-related information:

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

With this code, you can determine if your Android device is connected to Wi-Fi and obtain information about the connected Wi-Fi network.