如何使用parcelable將對象從一個Android活動發送到另一個活動？

Question

我想在我的應用程序中將Team類型的對象傳遞給另一個Activity。

的Team類：

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

如何傳遞嵌套TreeMap中與班上其他同學一起：

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()); 
    } 
} 

我編組時收到一個RuntimeException？

Answer 1

String,TreeMap和HashMap全部實現了Serializable接口。您可以考慮在您的Team課程中實施Serializable，並將其在相應的活動之間傳遞。這樣做會使您可以直接從Bundle或Intent加載對象，而無需手動解析它們。

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; 

不需要額外的解析代碼。

（編輯：ArrayList也實現Serializable所以這種解決方案依賴於Event類是可序列化與否）。