Android：如何實現Parcelable到我的對象？

Question

我有這個持有我的JSON索引的ConstantData類，我需要在具有額外功能的活動之間傳遞它們。但在此之前，我必須首先實現Parcelable到這個類的對象。

我的問題是，我應該如何在這裏聲明我的類中的對象，並將每個對象放在一個變量中？

我是新手，現在我完全無能爲力。謝謝。隨意修改我的代碼如下。

ConstantData.java

public class ConstantData{ 

     public static String project_title = "project title"; 
     public static String organization_title = "organization title"; 
     public static String keyword = "keyword"; 
     public static String short_code = "short code"; 
     public static String project_description = "description"; 
     public static String smallImageUrl = "smallImageUrl"; 
     public static String bigImageUrl = "bigImageUrl"; 
     public static String price= "price"; 
     public static String country= "country"; 



     public static ArrayList<Project> projectsList = new ArrayList<Project>(); 


     public int describeContents() { 
      return 0; 
     } 

     public void writeToParcel(Parcel out, int flags) { 
      out.writeString(project_title); 
      out.writeString(organization_title); 
      out.writeString(keyword); 
      out.writeString(short_code); 
      out.writeString(project_description); 
      out.writeString(smallImageUrl); 
      out.writeString(bigImageUrl); 
      out.writeString(price); 
      out.writeString(country); 
     } 

     public static final Parcelable.Creator<ConstantData> CREATOR 
       = new Parcelable.Creator<ConstantData>() { 
      public ConstantData createFromParcel(Parcel in) { 
       return new ConstantData(in); 
      } 

      public ConstantData[] newArray(int size) { 
       return new ConstantData[size]; 
      } 
     }; 

     private ConstantData(Parcel in) { 
      project_title = in.readString(); 
      organization_title = in.readString(); 
      keyword = in.readString(); 
      short_code = in.readString(); 
      project_description = in.readString(); 
      smallImageUrl = in.readString(); 
      bigImageUrl = in.readString(); 
      price = in.readString(); 
      country = in.readString(); 
     } 
    } 

如果我的問題不夠清楚，你可以看一下這個問題：How to send an object from one Android Activity to another using Intents?

在那裏，他寫道：myParcelableObject，我只是不知道如何製作可分類的對象。

編輯 Project.java

public class Project { 

    public String project_title; 
    public String organization_title; 
    public String keyword; 
    public String short_code; 
    public String project_description; 
    public String smallImageUrl; 
    public String bigImageUrl; 
    public String price; 
    public String country; 
} 

Answer 1

您需要實現Parcelable接口

public class ConstantData implements Parcelable { 

    public void writeToParcel(Parcel out, int flags) { 
     out.writeString(project_title); 
    .... 
     out.writeString(country); 
     out.writeList(projectsList); // <<-- 
    } 

    private ConstantData(Parcel in) { 
     project_title = in.readString(); 
     .... 
     country = in.readString(); 
     projectsList = in.readList(); 

我認爲對於寫作projectsList的工作，Project類還需要實施Parcelable。

參見例如例如this class。