Android 휴대폰 시스템 버전 번호, IMEI, 휴대폰 제조업체, 휴대폰 모델

/**
 *     IMEI 
 * 

 *       : android.permission.READ_PHONE_STATE
 */
public static String GetIMEI(Context context) {

    if (Build.VERSION.SDK_INT >= 23 && ActivityCompat.checkSelfPermission(context, Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
        //    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 "       IMEI   ";
    }

    TelephonyManager tm = (TelephonyManager) context.getSystemService(Activity.TELEPHONY_SERVICE);
    if (tm != null) {
        return tm.getDeviceId();
    } else {
        return "       IMEI   ";
    }
}

/**
 *            
 *
 * @return      
 */
public static String GetSystemVersion() {
    return android.os.Build.VERSION.RELEASE;
}

/**
 *       
 *
 * @return     
 */
public static String GetDeviceBrand() {
    return android.os.Build.BRAND;
}

/**
 *       
 *
 * @return     
 */
public static String GetSystemModel() {
    return android.os.Build.MODEL;
}