Question

我有一个包含我希望在意图之间传递的数据的类，这个类有包含另一个类对象的arraylist。这是我的班级

    public class ParsedData implements Parcelable {

        public String error;
        public float protectionLevel;
        public int protectionLevelColor;
        public double lastBackup;
        public boolean compressedType;
        public Long driveFreeSpaceSize;
        ArrayList<Item>Items = new ArrayList<Item>();
}

class Item {

    public String name;
    public float percentage;
    public int files;
    public long size;
}

我如何在意图之间发送此类？

Answer 1

您可以让class Item实现Serializable界面，并使用Intent.putExtra(String, Serializable)。由于ArrayList也实现了Serializable接口，因此您可以传递整个Items对象。

Answer 2

您可以查看Intent.putExtra（String name，Parcelable对象）并在您的类中实现parcelable接口。

Answer 3

这可能是你的问题：

实现Parcelable接口的类还必须有一个名为CREATOR的静态字段，它是实现Parcelable.Creator接口的对象。

或者，我也尝试Item实施Parcelable。

故障安全的替代方法是将您的数据结构写入JSON字符串，这也允许您将数据传递给无法访问ParsedData类的其他应用程序。

Answer 4

毕竟我找到了答案。谢谢所有人如何帮助我这就是答案：

import android.os.Parcel;
import android.os.Parcelable;

public class ParsedData implements Parcelable  {

    public String error;
    public float protectionLevel;
    public int protectionLevelColor;
    public double lastBackup;
    public boolean compressedType;
    public Long statusSendTime;
    ArrayList<Item>Items = new ArrayList<Item>();

    //---------------------Constructors---------------------------
    public ParsedData() { ; };

    public ParsedData(Parcel in) {
        readFromParcel(in);
    }
    //------------------------------------------------------------

    @Override
    public int describeContents() {
        return 0;
    }
    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(error);
        dest.writeFloat(protectionLevel);
        dest.writeInt(protectionLevelColor);
        dest.writeDouble(lastBackup);
        dest.writeByte((byte) (compressedType ? 1 : 0));  
        dest.writeLong(statusSendTime);
        dest.writeList(Items);

    }

    private void readFromParcel(Parcel in) {
        error = in.readString();
        protectionLevel = in.readFloat();
        protectionLevelColor = in.readInt();
        lastBackup = in.readDouble();
        compressedType =in.readByte() == 1; 
        statusSendTime = in.readLong();
        in.readList(Items,Item.class.getClassLoader() );

    }

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

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

class Item implements Parcelable {

    public String name;
    public float percentage;

    //---------------------Constructors---------------------------
    public Item() {
       }
    public Item(Parcel in) {
          readFromParcel(in);
       }
    //------------------------------------------------------------

    @Override
    public int describeContents() {
        return 0;
    }
    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(name);
        dest.writeFloat(percentage);
    }
    public static final Creator<Item> CREATOR = new Creator<Item>() {
          public Item createFromParcel(Parcel source) {
             return new Item(source);
          }
          public Item[] newArray(int size) {
             return new Item[size];
          }
       };
       private void readFromParcel(Parcel in) {
           this.name = in.readString();
           this.percentage = in.readFloat();
           }
}

和来电者活动

    ParsedData data = new PArsedData();
    Intent intentBreakDown = new Intent(this,BreakDownBarActivity.class);
    intentBreakDown.putExtra("data", data);
    startActivity(intentBreakDown);

在被调用的活动中（在我的情况下为BreakDownBarActivity）

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.breakdownbar);

        Bundle b = getIntent().getExtras();
        ParsedData data = (ParsedData)b.getParcelable("data");
    }

如何在意图之间传递对象

4 个答案: