保存列表收藏夹数据静态

Question

我有不同的列表视图，但现在我有问题。我想创建一种保存收藏夹的方法。很抱歉这个简单的问题，但我是 android 和 java 的新手。我知道这些数据是静态的，但我不知道是否可以共享偏好来保存这些数据。

import android.content.Intent;
import android.graphics.Color;
import android.renderscript.Sampler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TextView;

import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.MobileAds;

import java.io.BufferedReader;
import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;

public class ammunition extends AppCompatActivity {

   String[] listaammunition = new String[]{"Arrow Zigzag","Arrow, Alchemist’s Fire(1)"};

    EditText inputSearch;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ammunition);

        final ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(),
                android.R.layout.simple_list_item_1, listaammunition) {
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                View view = super.getView(position, convertView, parent);
                TextView text = (TextView) view.findViewById(android.R.id.text1);
                text.setTextColor(Color.BLACK);
                return view;
            }
        };

        ListView listViewammunition = (ListView) findViewById(R.id.listViewammunition);
        listViewammunition.setAdapter(adapter);


        inputSearch = (EditText) findViewById(R.id.inputSearchmunizioni);

        inputSearch.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                adapter.getFilter().filter(s);
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });


        listViewammunition.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                String Arrowalchemistsfire = adapter.getItem(position);
                if (Arrowalchemistsfire.equals("Arrow, Alchemist’s Fire(1)")) {
                    Intent Arrowalchemistsfire1 = new Intent(getApplicationContext(), dettagli_armi.class);
                    Arrowalchemistsfire1.putExtra("costo", "75 gp");
                    Arrowalchemistsfire1.putExtra("dannis", "1D4");
                    Arrowalchemistsfire1.putExtra("dannim", "1D4");
                    Arrowalchemistsfire1.putExtra("crit", "x2");
                    Arrowalchemistsfire1.putExtra("rangeinc", "30 ft.");
                    Arrowalchemistsfire1.putExtra("weight", "1/5 lb.");
                    Arrowalchemistsfire1.putExtra("type", "fire");
                    Arrowalchemistsfire1.putExtra("dettagli", "Each of these projectiles carries a deadly load of alchemist's fire in its hollow shaft.\n" +
                            " When it strikes a target, the arrow's shaft shatters, releasing the alchemist's fire directly onto the target. One round after impact, the alchemist's fire ignites, dealing 1d4 points of damage.\n" +
                            "\n" +
                            " The target can use a full-round action to attempt to extinguish the flames before taking this damage. It takes a successful Reflex saving throw (DC 15) to extinguish the flames.\n" +
                            " Rolling on the ground earns the target a +2 bonus on the save. Submerging (such as by leaping into a lake) or magically extinguishing the flames automatically kills the flames.\n");
                    Arrowalchemistsfire1.putExtra("Source", "Dragon #349");
                    startActivity(Arrowalchemistsfire1);
                }
                String Arrowalchemistsfrost = adapter.getItem(position);
                if (Arrowalchemistsfrost.equals("Arrow, Alchemist’s Frost(1)")) {
                    Intent Arrowalchemistsfrost1 = new Intent(getApplicationContext(), dettagli_armi.class);
                    Arrowalchemistsfrost1.putExtra("costo", "75 gp");
                    Arrowalchemistsfrost1.putExtra("dannis", "1D4");
                    Arrowalchemistsfrost1.putExtra("dannim", "1D4");
                    Arrowalchemistsfrost1.putExtra("crit", "x2");
                    Arrowalchemistsfrost1.putExtra("rangeinc", "30 ft.");
                    Arrowalchemistsfrost1.putExtra("weight", "1/5 lb.");
                    Arrowalchemistsfrost1.putExtra("type", "cold");
                    Arrowalchemistsfrost1.putExtra("dettagli", "Similar in designed to the Arrow alchemist's fire, this arrow instead carrier an alchemical compound that creates a spray of intense cold.\n" +
                            " If the arrow strikes a target, the arrow immediately shatters and deals 1d4 points of cold damage.\n");
                    Arrowalchemistsfrost1.putExtra("Source", "Dragon #349");
                    startActivity(Arrowalchemistsfrost1);
                }              
        });
    }
}

Answer 1

使用 tinyDB ，你只需要添加一个类。

https://github.com/kcochibili/TinyDB--Android-Shared-Preferences-Turbo

这里是代码sn-p

@Override 
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ecart);

          //Fetch data from DB
        GlobaDataHolder.getGlobaDataHolder().setShoppingList( 
                new TinyDB(getApplicationContext()).getListObject( 
                        PreferenceHelper.MY_CART_LIST_LOCAL, Product.class));


}



    @Override 
    protected void onPause() { 
        super.onPause(); 

        // Store Shopping Cart in DB 
        new TinyDB(getApplicationContext()).putListObject( 
                PreferenceHelper.MY_CART_LIST_LOCAL, GlobaDataHolder 
                        .getGlobaDataHolder().getShoppingList()); 
    } 

完整代码参考

https://github.com/hiteshsahu/ECommerce-App-Android/blob/master/app/src/main/java/com/hitesh_sahu/retailapp/view/activities/ECartHomeActivity.java