我如何使我的应用程序成为记住/保存我的应用程序用户获得我的应用程序的硬币？

您应该在Android上使用共享首选项。

You should use shared preferences on Android.

我写下了共享应用程序的完整功能示例偏好。

I write down a fully functional example of an application of a shared preferences. This one is taken from my project (link down the code).

首先，您应该创建一个类（假设您的硬币将用于更多活动） 。
这个叫做 SessionManager.java ：

First, you should create a class (supposing that your "coins" will be used in more activities). This one is called SessionManager.java:

    public class SessionManager {
    // Shared Preferences
    SharedPreferences pref;

    // Editor for Shared preferences
    Editor editor;

    // Context
    Context _context;

    // Shared pref mode
    int PRIVATE_MODE = 0;

    // Sharedpref file name
    private static final String PREF_NAME = "FoodAdvisorPref";

    // All Shared Preferences Keys
    private static final String IS_LOGIN = "IsLoggedIn";
    public static final String KEY_AZIENDA = "aziendaName";
    public static final String KEY_EMAIL = "email";
    public static final String KEY_NAME = "name";
    public static final String KEY_SECOND_NAME = "second_name";
    public static final String KEY_DESCRIPTION = "description";
    public static final String KEY_ID = "id";
    public static final String KEY_PHOTO = "photo";



    // Constructor
    public SessionManager(Context context){
        this._context = context;
        pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
        editor = pref.edit();
    }


    /**
     * Create login session
     * */
    public void createLoginSession(String azienda,String name,String second_name, String email,String description,String id,String photo){
        // Storing login value as TRUE
        editor.putBoolean(IS_LOGIN, true);

        editor.putString(KEY_NAME, name);
        editor.putString(KEY_EMAIL, email);
        editor.putString(KEY_AZIENDA,azienda);
        editor.putString(KEY_SECOND_NAME,second_name);
        editor.putString(KEY_DESCRIPTION,description);
        editor.putString(KEY_PHOTO,photo);
        editor.putString(KEY_ID,id);
        // commit changes
        editor.commit();
    }

    /**
     * Check login method wil check user login status
     * If false it will redirect user to login page
     * Else won't do anything
     * */
    public void checkLogin(){
        // Check login status
        if(!this.isLoggedIn()){
            // user is not logged in redirect him to Login Activity
            Intent i = new Intent(_context, LoginActivity.class);
            // Closing all the Activities
            i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            // Add new Flag to start new Activity
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

            // Staring Login Activity
            _context.startActivity(i);
        }

    }


//session data like hash
    public HashMap<String, String> getUserDetails(){
        HashMap<String, String> user = new HashMap<String, String>();
        user.put(KEY_NAME, pref.getString(KEY_NAME, null));
        user.put(KEY_EMAIL, pref.getString(KEY_EMAIL, null));
        user.put(KEY_AZIENDA, pref.getString(KEY_AZIENDA, null));
        user.put(KEY_SECOND_NAME, pref.getString(KEY_SECOND_NAME, null));
        user.put(KEY_DESCRIPTION, pref.getString(KEY_DESCRIPTION, null));
        user.put(KEY_ID, pref.getString(KEY_ID, null));
        user.put(KEY_PHOTO,pref.getString(KEY_PHOTO,null));

        return user;
    }

//close session
    public void logoutUser(){
        // Clearing all data from Shared Preferences
        editor.clear();
        editor.commit();

        // After logout redirect user to Loing Activity
        Intent i = new Intent(_context, LoginActivity.class);
        // Closing all the Activities
        i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

        // Add new Flag to start new Activity
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        // Starting Login Activity
        _context.startActivity(i);
    }

    // Get Login State
    public boolean isLoggedIn(){
        return pref.getBoolean(IS_LOGIN, false);
    }
}

要在其他活动中使用此类：

  SessionManager session; //as global variable if you want
  session = new pro.rane.foodadvisor.SessionManager(getApplicationContext()); //inside create view
 session.checkLogin();
 // get user data from session
 HashMap<String, String> user = session.getUserDetails();
 // name example
 String name = user.get(SessionManager.KEY_NAME);
 // email example
 String email = user.get(SessionManager.KEY_EMAIL);

这里是我的项目的来源。

此处是教程指向的实用链接。

Here is a practical link by tutorials point.

此处是Android开发人员。

Here is the official guide for Android developers.