每個列表項目的不同意圖Android

Question

我想給Coins.java中的每個列表項目提供Intents。當我添加意圖時，它將我帶到同一頁面。我在StackOverflow上搜索可能的答案。許多答案表示使用switch語句給出不同的意圖。但是，在我的應用程序中，列表中的項目數量不是常數。它可能是10或5甚至100。我搜索StackOverflow的答案，但我可以找到任何適用於我的應用程序。誰能告訴我該怎麼做？提前致謝。

1. Coins.java

   package com.example.android.cotescol; 
   import android.content.Intent; 
   import android.os.Bundle; 
   import android.view.LayoutInflater; 
   import android.view.View; 
   import android.view.ViewGroup; 
   import android.widget.AdapterView; 
   import android.widget.ListView; 
   import java.util.ArrayList; 
   
   public class Coins extends android.support.v4.app.Fragment{  
       @Override 
       public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
        View rootView = inflater.inflate(R.layout.currency_list, container, false); 
        final ArrayList<CoinObject> coins = new ArrayList<CoinObject>(); 
        coins.add(new CoinObject(1, "India", 1947)); 
        coins.add(new CoinObject(1, "India", 1947)); 
   
        CoinAdapter itemsAdapter = new CoinAdapter(getActivity(), coins); 
        ListView listView = (ListView) rootView.findViewById(R.id.list); 
        listView.setAdapter(itemsAdapter); 
   
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
         @Override 
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
          CoinObject coinObject = coins.get(position); 
          Intent intent = new Intent(Coins.this.getActivity(), DetailsActivity.class); 
          startActivity(intent); 
         } 
        }); 
   
        return rootView; 
       } 
   } 
   

2. CoinObject.java

   package com.example.android.cotescol; 
   
   import java.util.HashMap; 
   import java.util.Locale; 
   import java.util.Map; 
   
   public class CoinObject { 
   
       private final static int NO_IMAGE_AVAILABLE = R.drawable.nia; 
       private final static String NOT_AVAILABLE = "Material Not Specified"; 
       private final static double NOT_KNOWN = 0.00; 
   
       private int denomination; 
       private String country; 
       private String countryCode; 
       private int year; 
       private int obverseImageResourceId = NO_IMAGE_AVAILABLE; 
       private int reverseImageResourceId = NO_IMAGE_AVAILABLE; 
       private String material = NOT_AVAILABLE; 
       private double diameter = NOT_KNOWN; 
       private double weight = NOT_KNOWN; 
       private double thickness = NOT_KNOWN; 
       private double value = NOT_KNOWN; 
   
       public CoinObject(int denomination, String country, int year, int obverseImageResourceId, int reverseImageResourceId , double diameter, double thickness, String material, double weight, double value) { 
        this.denomination = denomination; 
        this.country = country; 
        this.year = year; 
        this.obverseImageResourceId = obverseImageResourceId; 
        this.reverseImageResourceId = reverseImageResourceId; 
        this.diameter = diameter; 
        this.thickness = thickness; 
        this.material = material; 
        this.weight = weight; 
        this.value = value; 
        this.countryCode = getCountryCode(country); 
       } 
   
       public CoinObject(int denomination, String country, int year, double diameter, double thickness, String material, double weight, double value) { 
        this.denomination = denomination; 
        this.country = country; 
        this.year = year; 
        this.diameter = diameter; 
        this.thickness = thickness; 
        this.material = material; 
        this.weight = weight; 
        this.value = value; 
        this.countryCode = getCountryCode(country); 
       } 
   
       public CoinObject(int denomination, String country, int year) { 
        this.denomination = denomination; 
        this.country = country; 
        this.year = year; 
        this.countryCode = getCountryCode(country); 
       } 
   
       public String getCountryCode(String countryName) { 
        // Get all country codes in a string array. 
        String[] isoCountryCodes = Locale.getISOCountries(); 
        Map<String, String> countryMap = new HashMap<>(); 
        // Iterate through all country codes: 
        for (String code : isoCountryCodes) { 
         // Create a locale using each country code 
         Locale locale = new Locale("", code); 
         // Get country name for each code. 
         String name = locale.getDisplayCountry(); 
         // Map all country names and codes in key - value pairs. 
         countryMap.put(name, code); 
        } 
        // Get the country code for the given country name using the map. 
        // Here you will need some validation or better yet 
        // a list of countries to give to user to choose from. 
        String countryCode = countryMap.get(countryName); // "NL" for Netherlands. 
   
        return countryCode; 
       } 
   
       public int getDenomination() { return denomination; } 
       public int getYear() { return year; } 
       public int getObverseImageResourceId() { return obverseImageResourceId; } 
       public int getReverseImageResourceId() { return reverseImageResourceId; } 
       public double getDiameter() { return diameter; } 
       public double getWeight() { return weight; } 
       public double getThickness() { return thickness; } 
       public double getValue() { return value; } 
       public String getCountry() { return country; } 
       public String getCountryCode() { return countryCode; } 
       public String getMaterial() { return material; } 
   } 
   

Answer 1

你應該讓你的硬幣對象Parcelable，然後你可以通過該對象在意向作爲額外，

intent.putExtra("coin", coinObject); 

那麼你提取硬幣的對象在你的活動，

Coin coin = intent.getParcelableExtra("coin");