public static String getIMEI(Context context) {
	String deviceId = null;
	try {
		TelephonyManager tm = (TelephonyManager) context
				.getSystemService(Context.TELEPHONY_SERVICE);
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
			deviceId = Settings.System.getString(context.getContentResolver(), Settings.Secure.ANDROID_ID);
		} else {
			// request old storage permission
			if (ActivityCompat.checkSelfPermission(context, Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
				// TODO: Consider calling
				//    ActivityCompat#requestPermissions
				// here to request the missing permissions, and then overriding
				//   public void onRequestPermissionsResult(int requestCode, String[] permissions,
				//                                          int[] grantResults)
				// to handle the case where the user grants the permission. See the documentation
				// for ActivityCompat#requestPermissions for more details.
				return null;
			}
			deviceId = tm.getDeviceId();
		}
		if (deviceId == null || "".equals(deviceId)) {
			return getLocalMacAddress(context);
		}
	} catch (Exception e) {
		e.printStackTrace();
		if (deviceId == null || "".equals(deviceId)) {
			return getLocalMacAddress(context);
		}
	}
	return deviceId;
}

public static String getLocalMacAddress(Context context) {
	String strMac = null;
	if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
		Log.e("=====", "6.0以下");
		strMac = getLocalMacAddressFromWifiInfo(context);
		return strMac;
	} else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N
			&& Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
		Log.e("=====", "6.0以上7.0以下");
		strMac = getMacAddress(context);
		return strMac;
	} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
		Log.e("=====", "7.0以上");
		if (!TextUtils.isEmpty(getMacAddress())) {
			Log.e("=====", "7.0以上1");
			strMac = getMacAddress();
			return strMac;
		} else if (!TextUtils.isEmpty(getMachineHardwareAddress())) {
			Log.e("=====", "7.0以上2");
			strMac = getMachineHardwareAddress();
			return strMac;
		} else {
			Log.e("=====", "7.0以上3");
			strMac = getLocalMacAddressFromBusybox();
			return strMac;
		}
	}
	return "02:00:00:00:00:00";
}