无法在新活动中检索额外数据

Posted 2023-04-19

【中文标题】无法在新活动中检索额外数据

【英文标题】：Can't retrieve extra data in new activity

【发布时间】：2020-12-09 20:33:38

【问题描述】：

当我点击 Recycler 视图中的 CardView 时，我已将 Parcelable 实现为我想在活动之间传递的对象。唯一的问题是对象（ResultsHelperClass）在接收到意图时总是有修改的值。

我现在完全陷入困境，因为我似乎找不到问题所在。

我作为额外对象传递给意图的对象具有正确的值，但无论我如何尝试接收它，它的值总是会发生变化。

我的 ResultsHelperClass

public class ResultsHelperClass implements Parcelable 

    int  localScore, visitorScore, teamId;
    String teamName, localLogoUrl, visitorLogoUrl, local, date;

      //Constructor
public ResultsHelperClass(String localLogoUrl, String visitorLogoUrl, String local, String date, int teamId, int localScore, int visitorScore, String teamName) 
    this.localScore = localScore;
    this.visitorScore = visitorScore;
    this.teamName = teamName;
    this.teamId = teamId;
    this.localLogoUrl = localLogoUrl;
    this.visitorLogoUrl = visitorLogoUrl;
    this.local = local;
    this.date = date;


    //Constructor
    public ResultsHelperClass() 
        this.localScore = 0;
    this.visitorScore = 0;
    this.teamId = 0;
    this.teamName = "";
    this.localLogoUrl = "";
    this.visitorLogoUrl = "";
    this.local = "";
    this.date = "";
    

    protected ResultsHelperClass(Parcel in) 
        localScore = in.readInt();
        visitorScore = in.readInt();
        teamId = in.readInt();
        teamName = in.readString();
        localLogoUrl = in.readString();
        visitorLogoUrl = in.readString();
        local = in.readString();
        date = in.readString();
    

    public static final Creator<ResultsHelperClass> CREATOR = new Creator<ResultsHelperClass>() 
        @Override
        public ResultsHelperClass createFromParcel(Parcel in) 
            return new ResultsHelperClass(in);
        

        @Override
        public ResultsHelperClass[] newArray(int size) 
            return new ResultsHelperClass[size];
        
    ;

    //Getters
    public int getLocalScore() 
        return localScore;
    

    public int getVisitorScore() 
        return visitorScore;
    

    public String getTeamName() 
        return teamName;
    

    public int getTeamId() 
        return teamId;
    


    public String getLocal() 
        return local;
    

    public String getDate() 
        return date;
    

    public String getLocalLogoUrl() 
        return localLogoUrl;
    

    public String getVisitorLogoUrl() 
        return visitorLogoUrl;
    

    //Setters
    public void setLocalScore(int localScore) 
        this.localScore = localScore;
    

    public void setVisitorScore(int visitorScore) 
        this.visitorScore = visitorScore;
    

    public void setTeamName(String teamName) 
        this.teamName = teamName;
    

    public void setTeamId(int teamId) 
        this.teamId = teamId;
    

    public void setLocalLogoUrl(String localLogoUrl) 
        this.localLogoUrl = localLogoUrl;
    

    public void setVisitorLogoUrl(String visitorLogoUrl) 
        this.visitorLogoUrl = visitorLogoUrl;
    

    public void setLocal(String local) 
        this.local = local;
    

    public void setDate(String date) 
        this.date = date;
    

    @Override
    public int describeContents() 
        return 0;
    

    @Override
    public void writeToParcel(Parcel dest, int flags) 

        dest.writeString(teamName);
        dest.writeString(localLogoUrl);
        dest.writeString(visitorLogoUrl);
        dest.writeString(local);
        dest.writeString(date);
        dest.writeInt(localScore);
        dest.writeInt(visitorScore);
        dest.writeInt(teamId);

    

    @Override
    public String toString() 
        return "ResultsHelperClass" +
                "localScore=" + localScore +
                ", visitorScore=" + visitorScore +
                ", teamId=" + teamId +
                ", teamName='" + teamName + '\'' +
                ", localLogoUrl='" + localLogoUrl + '\'' +
                ", visitorLogoUrl='" + visitorLogoUrl + '\'' +
                ", local='" + local + '\'' +
                ", date='" + date + '\'' +
                '';
    

我在将所选项目发送到 Extra Intent 之前打印它：

@Override
    public void onGameClick(int position) 

        Intent in = new Intent(this, Team.class);
        System.out.println(listResults.get(position));
        in.putExtra("game", listResults.get(position));
        startActivity(in);
    

这会打印所选项目的正确值：

I/System.out：ResultsHelperClasslocalScore=0, visitorScore=0, teamId=1, teamName='Sénior Masculí', localLogoUrl='https://pitudev.com/sacabaneta/rivals/scabaneta.jpg', visitorLogoUrl='https://www.pitudev.com/scabaneta/rivals/sonservera.jpg', local='1', date='2020-08-16 18:30:00.000000'

在新活动（团队）中，我这样做是为了从所选项目中检索数据：

if (getIntent().hasExtra("game"))

    ResultsHelperClass selected_game = getIntent().getParcelableExtra("game");
    System.out.println(selected_game);

这会打印这些值：

I/System.out：ResultsHelperClasslocalScore=15，visitorScore=15269971，teamId=6881390，teamName='null'，localLogoUrl='null'，visitorLogoUrl='null'，local='null'，date='空'

这对我来说毫无意义，因为我已经检查过我是否传递了正确的值...如果有人可以提供帮助，我将不胜感激...谢谢

【参考方案1】：

固定...

问题是 writeToParcel() 和 ResultsHelperClass(Parcel in) 属性需要处于相同的顺序...

希望这对未来的人有所帮助！