Android DeviceID from Umeng

public static boolean checkPermission(Context context, String permission) {
    boolean result = false;
    if (Build.VERSION.SDK_INT >= 23) {
        try {
            Class clazz = Class.forName("android.content.Context");
            Method method = clazz.getMethod("checkSelfPermission", String.class);
            int rest = (Integer) method.invoke(context, permission);
            if (rest == PackageManager.PERMISSION_GRANTED) {
                result = true;
            } else {
                result = false;
            }
        } catch (Exception e) {
            result = false;
        }
    } else {
        PackageManager pm = context.getPackageManager();
        if (pm.checkPermission(permission, context.getPackageName()) == PackageManager.PERMISSION_GRANTED) {
            result = true;
        }
    }
    return result;
}
public static String getDeviceInfo(Context context) {
    try {
        org.json.JSONObject json = new org.json.JSONObject();
        android.telephony.TelephonyManager tm = (android.telephony.TelephonyManager) context
                .getSystemService(Context.TELEPHONY_SERVICE);
        String device_id = null;
        if (checkPermission(context, permission.READ_PHONE_STATE)) {
            device_id = tm.getDeviceId();
        }
        String mac = null;
        FileReader fstream = null;
        try {
            fstream = new FileReader("/sys/class/net/wlan0/address");
        } catch (FileNotFoundException e) {
            fstream = new FileReader("/sys/class/net/eth0/address");
        }
        BufferedReader in = null;
        if (fstream != null) {
            try {
                in = new BufferedReader(fstream, 1024);
                mac = in.readLine();
            } catch (IOException e) {
            } finally {
                if (fstream != null) {
                    try {
                        fstream.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (in != null) {
                    try {
                        in.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
        json.put("mac", mac);
        if (TextUtils.isEmpty(device_id)) {
            device_id = mac;
        }
        if (TextUtils.isEmpty(device_id)) {
            device_id = android.provider.Settings.Secure.getString(context.getContentResolver(),
                    android.provider.Settings.Secure.ANDROID_ID);
        }
        json.put("device_id", device_id);
        return json.toString();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}
                  

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