Saved Perf in Android

Just add this class in your package

package com.plzf1.rollearn;
import android.app.Application;import android.content.SharedPreferences;
public class MyApplication extends Application {


    public static final String MENULIST = "menulist";    public static final String VEGLIST="veglist";    public static final String CARTLIST="cartlist";    public static final String FRUITLIST ="fruitlist";    @Override    public void onCreate() {
        super.onCreate();    }

    public void saveIntoPrefs(String key, String value) {
        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME,MODE_PRIVATE);        SharedPreferences.Editor edit = prefs.edit();        edit.putString(key, value);        edit.commit();
    }

    public void saveIntoPrefs(String key, int value) {
        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME,MODE_PRIVATE);        SharedPreferences.Editor edit = prefs.edit();        edit.putInt(key, value);        edit.commit();
    }

    public void saveDoubleIntoPrefs(String key, double value) {
        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME,MODE_PRIVATE);        SharedPreferences.Editor edit = prefs.edit();        edit.putLong(key, Double.doubleToRawLongBits(value));        edit.commit();
    }

    public String getFromPrefs(String key) {
        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME,MODE_PRIVATE);        return prefs.getString(key, Fconstants.DEFAULT_VALUE);    }

    public double getDoubleFromPrefs(String key) {
        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME,MODE_PRIVATE);        return Double.longBitsToDouble(prefs.getLong(key,                Double.doubleToLongBits(0)));    }

    public int getIntFromPrefs(String key) {
        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME,MODE_PRIVATE);        return prefs.getInt(key, 0);    }

    public long getLongFromPrefs(String key) {
        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME,MODE_PRIVATE);        return prefs.getLong(key, -1);    }

    public void clearPrefs() {
        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME,MODE_PRIVATE);        prefs.edit().clear().commit();    }

//    public void storeMenuList(Context context, @SuppressWarnings("rawtypes") List favorites) {//        // used for store arrayList in json format//        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME_A,MODE_PRIVATE);//        SharedPreferences.Editor editor;//        editor = prefs.edit();//        Gson gson = new Gson();//        String jsonFavorites = gson.toJson(favorites);//        editor.putString(MENULIST, jsonFavorites);//        editor.commit();//    }
//    public ArrayList<MenuListVO> getMenuList(Context context) {////        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME_A,MODE_PRIVATE);//        List<MenuListVO> arrMenuList;//        if (prefs.contains(MENULIST)) {//            String jsonFavorites = prefs.getString(MENULIST, null);//            Gson gson = new Gson();//            MenuListVO[] favoriteItems = gson.fromJson(jsonFavorites,//                    MenuListVO[].class);////            arrMenuList = Arrays.asList(favoriteItems);//            arrMenuList = new ArrayList<MenuListVO>(arrMenuList);//        } else//            return null;////        return (ArrayList<MenuListVO>) arrMenuList;//    }////    public void storeVegitableList(Context context, @SuppressWarnings("rawtypes") List favorites) {//        // used for store arrayList in json format//        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME_A,MODE_PRIVATE);//        SharedPreferences.Editor editor;//        editor = prefs.edit();//        Gson gson = new Gson();//        String jsonFavorites = gson.toJson(favorites);//        editor.putString(VEGLIST, jsonFavorites);//        editor.commit();//    }
//    public ArrayList<VegVo> getVegitableList(Context context) {////        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME_A,MODE_PRIVATE);//        List<VegVo> arrveglist;//        if (prefs.contains(VEGLIST)) {//            String jsonFavorites = prefs.getString(VEGLIST, null);//            Gson gson = new Gson();//            VegVo[] favoriteItems = gson.fromJson(jsonFavorites,//                    VegVo[].class);////            arrveglist = Arrays.asList(favoriteItems);//            arrveglist = new ArrayList<VegVo>(arrveglist);//        } else//            return null;////        return (ArrayList<VegVo>) arrveglist;//    }
//    public void storeCartList(Context context, @SuppressWarnings("rawtypes") List cart) {//        // used for store arrayList in json format//        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME_A,MODE_PRIVATE);//        SharedPreferences.Editor editor;//        editor = prefs.edit();//        Gson gson = new Gson();//        String jsonFavorites = gson.toJson(cart);//        editor.putString(CARTLIST, jsonFavorites);//        editor.commit();//    }

//    public ArrayList<cartVo> getcartList(Context context) {////        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME_A,MODE_PRIVATE);//        List<cartVo> arrcartList;//        if (prefs.contains(CARTLIST)) {//            String jsonFavorites = prefs.getString(CARTLIST, null);//            Gson gson = new Gson();//            cartVo[] cartItems = gson.fromJson(jsonFavorites,//                    cartVo[].class);////            arrcartList = Arrays.asList(cartItems);//            arrcartList = new ArrayList<cartVo>(arrcartList);//        } else//            return null;////        return (ArrayList<cartVo>) arrcartList;//    }
//    public void storeFruitList(Context context, @SuppressWarnings("rawtypes") List cart) {//        // used for store arrayList in json format//        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME_A,MODE_PRIVATE);//        SharedPreferences.Editor editor;//        editor = prefs.edit();//        Gson gson = new Gson();//        String jsonFavorites = gson.toJson(cart);//        editor.putString(FRUITLIST, jsonFavorites);//        editor.commit();//    }////    public ArrayList<FruitVo> getfruitList(Context context) {////        SharedPreferences prefs = getSharedPreferences(Fconstants.PREF_NAME_A,MODE_PRIVATE);//        List<FruitVo> arrfruitList;//        if (prefs.contains(FRUITLIST)) {//            String jsonFavorites = prefs.getString(FRUITLIST, null);//            Gson gson = new Gson();//            FruitVo[] cartItems = gson.fromJson(jsonFavorites,//                    FruitVo[].class);////            arrfruitList = Arrays.asList(cartItems);//            arrfruitList = new ArrayList<FruitVo>(arrfruitList);//        } else//            return null;////        return (ArrayList<FruitVo>) arrfruitList;//    }arrfruitList



}

create MVVM Architecture Pattern for my android app

Here is an example of how you could implement the MVVM (Model-View-ViewModel) architecture pattern in an Android app using Java: Create a View class, for example MainActivity that extends AppCompatActivity and is responsible for handling user interactions and displaying data to the user. public class MainActivity extends AppCompatActivity { private ActivityMainBinding binding; private MainViewModel viewModel; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); binding = DataBindingUtil.setContentView(this, R.layout.activity_main); viewModel = new ViewModelProvider(this).get(MainViewModel.class); binding.setViewModel(viewModel); binding.setLifecycleOwner(this); } } } } Create a ViewModel class, for example MainViewModel that extends AndroidViewModel and is responsible for holding and processing the data for the View , as well as handling any business logicy code public cla...

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