如何使用parcelable将对象从一个Android活动发送到另一个活动？

Question

我想在我的应用程序中将Team类型的对象传递给另一个Activity。

的Team类：

TreeMap<String, HashMap<Integer, ArrayList<Event>>> matchDays; 

如何传递嵌套TreeMap中与班上其他同学一起：

public class Team implements Parcelable { 

    String teamName; 

    //Name and Link to competition of Team 
    TreeMap<String, String> competitions; 
    //Name of competition with a map of matchdays with all games to a matchday 
    TreeMap<String, HashMap<Integer, ArrayList<Event>>> matchDays; 

    public int describeContents() { 
     return 0; 
    } 

    public void writeToParcel(Parcel dest, int flags) { 
     dest.writeString(teamName); 
     dest.writeMap(competitions);  
    } 

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

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

    private Team(Parcel in) { 
     teamName = in.readString(); 

     in.readMap(competitions, Team.class.getClassLoader()); 
    } 
} 

我编组时收到一个RuntimeException？

Answer 1

String,TreeMap和HashMap全部实现了Serializable接口。您可以考虑在您的Team课程中实施Serializable，并将其在相应的活动之间传递。这样做会使您可以直接从Bundle或Intent加载对象，而无需手动解析它们。

public class Team implements Serializable { 

    String teamName; 

    //Name and Link to competition of Team 
    TreeMap<String, String> competitions; 
    //Name of competition with a map of matchdays with all games to a matchday 
    TreeMap<String, HashMap<Integer, ArrayList<Event>>> matchDays; 

不需要额外的解析代码。

（编辑：ArrayList也实现Serializable所以这种解决方案依赖于Event类是可序列化与否）。