MAC Address always returns 02:00:00:00:00:00; Serial Number not valid as well

[natterstefan]

Hi, I am using the latest version of your package and encounter the following issues:

• MAC Address always returns a wrong address
• Serial Number is not valid, means I cannot find the result in the "About Device" Settings

Probably this PR is related (not tested/verified though): #150

I've read the following on stackoverflow:

(...) To provide users with greater data protection, starting in this release, Android removes programmatic access to the device’s local hardware identifier for apps using the Wi-Fi and Bluetooth APIs. The WifiInfo.getMacAddress() and the BluetoothAdapter.getAddress() methods now return a constant value of 02:00:00:00:00:00. (...)

Could this help somehow? ==> https://stackoverflow.com/questions/44613285/how-do-i-get-local-mac-address-of-my-mobiles-own-bluetooth-in-react-native

Does anyone encounter these issues as well? Thanks for your help.

[yuansun235]

package com.learnium.RNDeviceInfo;

import android.Manifest;
import android.app.KeyguardManager;
import android.bluetooth.BluetoothAdapter;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiInfo;
import android.os.Build;
import android.provider.Settings.Secure;
import android.webkit.WebSettings;
import android.telephony.TelephonyManager;
import android.text.format.Formatter;

import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.Callback;
import com.facebook.react.bridge.Promise;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import java.net.NetworkInterface;
import java.util.Collections;
import java.util.List;

import javax.annotation.Nullable;

public class RNDeviceModule extends ReactContextBaseJavaModule {
...
@ReactMethod
public void getMacAddress(Promise p) {
String macAddress = getWifiInfo().getMacAddress();

try {
	List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
	for (NetworkInterface nif : all) {
		if (!nif.getName().equalsIgnoreCase("wlan0")) continue;

		byte[] macBytes = nif.getHardwareAddress();
		if (macBytes == null) {
			macAddress = "";
		}

		StringBuilder res1 = new StringBuilder();
		for (byte b : macBytes) {
			//res1.append(Integer.toHexString(b & 0xFF) + ":");
			res1.append(String.format("%02X:",b));
		}

		if (res1.length() > 0) {
			res1.deleteCharAt(res1.length() - 1);
		}
		macAddress = res1.toString();
	}
} catch (Exception ex) {
	//Log.d("DEBUG", ex.getMessage());
}	
p.resolve(macAddress);

}

...
}

Please rewrite the RNDeviceModule.java's getMacAddress() function like the above.

Thanks!

[machour]

Hi @yuansun235. The best thing would probably be to open a PR for this :)

[machour]

getMACAddress() was fixed in 0.17.4

As for the serial, we're using Build.SERIAL that seems to work well on my OnePlus 5T (don't mind the mac address in the screenshot):

Test	Settings

Could you please re-open a new issue for the serial problem, providing more information?

[natterstefan]

Hi @machour, I will test it (as soon as I can) and re-open it if needed. Thanks for your help.