Android getParcelableExtra对象始终返回null

所以我试图将一个对象作为可包裹的从一个活动发送到另一个活动，但是接收方的对象总是空的。对象在发送方完全被填充，所以我几乎可以肯定它与读取对象有关

这是可包裹的对象：

import android.graphics.Bitmap;
import android.os.Parcel;
import android.os.Parcelable;

public class Picture implements Parcelable {

    public String pictureID, title, year, price, author;
    public Bitmap picture;

    public Picture(){
    }

    public int describeContents() {
        return 0;
    }

    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(pictureID);
        dest.writeString(title);
        dest.writeString(year);
        dest.writeString(price);
        dest.writeString(author);
        dest.writeParcelable(picture, flags);
    }

    protected Picture(Parcel in) {
        pictureID = in.readString();
        title = in.readString();
        year = in.readString();
        price = in.readString();
        author = in.readString();
        picture = in.readParcelable(Bitmap.class.getClassLoader());
    }

    public static final Parcelable.Creator<Picture> CREATOR = new Parcelable.Creator<Picture>() {
        public Picture createFromParcel(Parcel source) {
            return new Picture(source);
        }
        public Picture[] newArray(int size) {
            return new Picture[size];
        }
    };
}

Picture firstPic = new Picture();
firstPic.pictureID = "1";
firstPic.title = "Mona Lisa";
firstPic.author = "Leonardo Da Vinci";
firstPic.price = "99999000";
firstPic.year = "2250";
firstPic.picture = BitmapFactory.decodeResource(getApplication().getResources(),R.drawable.monalisa);
Intent i = new Intent(getApplicationContext(),MainScreen.class);
i.putExtra("first",firstPic);
startActivity(i);
finish();

Picture currentPicture = new Picture();
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Intent intent = getIntent();
    currentPicture = intent.getParcelableExtra("first");
}

接收者活动：

import android.graphics.Bitmap;
import android.os.Parcel;
import android.os.Parcelable;

public class Picture implements Parcelable {

    public String pictureID, title, year, price, author;
    public Bitmap picture;

    public Picture(){
    }

    public int describeContents() {
        return 0;
    }

    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(pictureID);
        dest.writeString(title);
        dest.writeString(year);
        dest.writeString(price);
        dest.writeString(author);
        dest.writeParcelable(picture, flags);
    }

    protected Picture(Parcel in) {
        pictureID = in.readString();
        title = in.readString();
        year = in.readString();
        price = in.readString();
        author = in.readString();
        picture = in.readParcelable(Bitmap.class.getClassLoader());
    }

    public static final Parcelable.Creator<Picture> CREATOR = new Parcelable.Creator<Picture>() {
        public Picture createFromParcel(Parcel source) {
            return new Picture(source);
        }
        public Picture[] newArray(int size) {
            return new Picture[size];
        }
    };
}

Picture firstPic = new Picture();
firstPic.pictureID = "1";
firstPic.title = "Mona Lisa";
firstPic.author = "Leonardo Da Vinci";
firstPic.price = "99999000";
firstPic.year = "2250";
firstPic.picture = BitmapFactory.decodeResource(getApplication().getResources(),R.drawable.monalisa);
Intent i = new Intent(getApplicationContext(),MainScreen.class);
i.putExtra("first",firstPic);
startActivity(i);
finish();

Picture currentPicture = new Picture();
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Intent intent = getIntent();
    currentPicture = intent.getParcelableExtra("first");
}

编辑：我已经检查了关于Parcelable的所有其他主题，我也遵循了这些主题，但我无法真正找到错误所在的差异

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编辑2：问题已解决。从一开始，一切都很正常，但出于某种原因，我在用数据填充对象和putExtra之间添加了一些代码，所以基本上我发送的是一个空对象”\_(ツ)_/“

首先避免传递位图，它们可能太大，并将字符串

“First”

提取为常量，以

接收活动

类：

public class ReceiverActivity extends ... {
    public static final String EXTRA_FIRST = "first";
    ...
} 

因此：

及

---

这个奇怪的事情已经发生在我身上了，我用这种方法解决了它。

你到底有什么建议？在

i.putExtra（）之后发布代码

您启动活动的地方添加到上述代码中尝试了它，但不幸的是，所有参数仍然为null。请尝试不使用位图。我相信这是默认值，因为我没有设置它。