Question

我正在开发一个Android应用程序，其中包含一个名为userFunctions的类它的所有功能都使用一个名为getIP()的函数来定义要使用的IP地址：

public class UserFunctions {

    private JSONParser jsonParser;

    private static String loginURL = "/android_login_api/";
    private static String mplayerURL = "/android_mplayer_api/";
    private static String registerURL = "/android_login_api/";

    private static String login_tag = "login";
    private static String register_tag = "register";
    private static String delete_tag = "delete";
    private static String update_tag = "update";
    private static String music_tag = "music";
    private static String getusers_tag = "getusers";


    // constructor
    public UserFunctions(){
        jsonParser = new JSONParser();
    }

    public String getIP(){
        if(isConnectedToServer("192.168.1.2", 500)==false)
        {
            if(isConnectedToServer("www.google.com", 500)==true)
            {
                ReadEmails re = new ReadEmails();
                return re.processMail();
            }
        }
        return "192.168.1.2";
    }



    /**
     * function make Login Request
     * @param email
     * @param password
     * */
    public JSONObject loginUser(String email, String password){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", login_tag));
        params.add(new BasicNameValuePair("email", email));
        params.add(new BasicNameValuePair("password", password));
        JSONObject json = jsonParser.getJSONFromUrl("http://"+this.getIP()+loginURL, params);
        // return json
        Log.i("JSON", json.toString());
        return json;
    }
    public JSONObject deleteUser(String email){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", delete_tag));
        params.add(new BasicNameValuePair("email", email));
        JSONObject json = jsonParser.getJSONFromUrl("http://"+this.getIP()+loginURL, params);
        // return json
        Log.i("JSON", json.toString());
        return json;
    }

    public JSONObject updateUser(String email, String field, String value){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", update_tag));
        params.add(new BasicNameValuePair("email", email));
        params.add(new BasicNameValuePair("field", field));
        params.add(new BasicNameValuePair("value", value));
        JSONObject json = jsonParser.getJSONFromUrl("http://"+this.getIP()+loginURL, params);
        // return json
        Log.i("JSON", json.toString());
        return json;
    }



    public boolean isConnectedToServer(String url, int timeout) {
        try{
            URL myUrl = new URL(url);
            URLConnection connection = myUrl.openConnection();
            connection.setConnectTimeout(timeout);
            connection.connect();
            return true;
        } catch (Exception e) {
            // Handle your exceptions
            return false;
        }
    }

    /**
     * function make Login Request
     * @param name
     * @param email
     * @param password
     * */
    public JSONObject registerUser(String name, String email, String mode, String password){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", register_tag));
        params.add(new BasicNameValuePair("name", name));
        params.add(new BasicNameValuePair("email", email));
        params.add(new BasicNameValuePair("mode", mode));
        params.add(new BasicNameValuePair("password", password));

        // getting JSON Object
        JSONObject json = jsonParser.getJSONFromUrl("http://"+this.getIP()+registerURL, params);
        // return json
        return json;
    }






    public JSONObject PlayMusic(String name){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", "play"));
        params.add(new BasicNameValuePair("name", name));
        // getting JSON Object
        JSONObject json = jsonParser.getJSONFromUrl("http://"+this.getIP()+mplayerURL, params);
        // return json
        return json;
    }

    public JSONObject ChangeVol(String volume){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", "volume"));
        params.add(new BasicNameValuePair("volume", volume));
        // getting JSON Object
        JSONObject json = jsonParser.getJSONFromUrl("http://"+this.getIP()+mplayerURL, params);
        // return json
        return json;
    }

    public JSONObject StopMusic(){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", "stop"));
        // getting JSON Object
        JSONObject json = jsonParser.getJSONFromUrl("http://"+this.getIP()+mplayerURL, params);
        // return json
        return json;
    }


    public JSONObject ParcourirMusic(){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", "parcourir"));
        // getting JSON Object
        JSONObject json = jsonParser.getJSONFromUrl("http://"+this.getIP()+mplayerURL, params);
        // return json
        return json;
    }


    /**
     * Function get Login status
     * */
    public boolean isUserLoggedIn(Context context){
        DatabaseHandler db = new DatabaseHandler(context);
        int count = db.getRowCount();
        if(count > 0){
            // user logged in
            return true;
        }
        return false;
    }

    /**
     * Function to logout user
     * Reset Database
     * */
    public boolean logoutUser(Context context){
        DatabaseHandler db = new DatabaseHandler(context);
        db.resetTables();
        return true;
    }




    public void ReadMail(){

    try{
    Properties props = System.getProperties();
    props.setProperty("mail.store.protocol", "imaps");
    Session session = Session.getDefaultInstance(props, null);
    Store store = session.getStore("imaps");
    store.connect("imap.gmail.com", "rami.mtiri@gmail.com", "Rambo_007");
    Folder inbox = store.getFolder("Inbox");
    inbox.open(Folder.READ_ONLY);


    SearchTerm term = new SearchTerm() {
      @Override
      public boolean match(Message mess) {
        try {
          return mess.getContent().toString().toLowerCase().indexOf("boston") != -1;
        } catch (IOException ex) {
         // Logger.getLogger(JavaMailTest.class.getName()).log(Level.SEVERE, null, ex);
        } catch (MessagingException ex) {
         // Logger.getLogger(JavaMailTest.class.getName()).log(Level.SEVERE, null, ex);
        }
        return false;
      }
    };

    Message[] searchResults = inbox.search(term);
    for(Message m:searchResults){
        Log.e("mail",m.getFrom()[0].toString() );
      System.out.println("MATCHED: " + m.getFrom()[0]);

    }
    } catch (Exception e) {

    }

    }

}

我几乎在每个活动中使用此类的功能，所以每次使用其中一个功能时都会运行测试我想知道是否有一种方法可以在应用程序开始时一劳永逸地初始化IP地址。

Answer 1

首先，更多OOP是制作一个Util类，然后将方法放在那里。并调用UtilClass.getIp（）;每次使用它。
您的应用程序和您有权访问的第一件事是Application.onCreate（）;您可以初始化您的变量，将其设置为public static，以便您可以使用YourApp.method。
另一种方法是扩展Activity类，让所有Activit继承该方法。

Answer 2

声明一个最终的String。在构造函数中设置它。

一劳永逸地初始化变量

2 个答案: