【问题标题】:Can't retrieve extra data in new activity无法在新活动中检索额外数据
【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:ResultsHelperClass{localScore=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:ResultsHelperClass{localScore=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

【问题讨论】:

    标签: java android android-intent parcelable


    【解决方案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!

    【讨论】:

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