传递和 ArrayList<Service>通过意图 [英] Passing and ArrayList&lt;Service&gt; through intent

问题描述

我有一个叫做Service的类，它用来使用这个构造函数来创建Service对象

I have a class called Service, which is used to create Service objects using this constructor

public Service(int id, String service_name, String service_code) {
    this.id = id;
    this.service_name = service_name;
    this.service_code = service_code;
}

然后我创建一个列表调用服务列表，如下签名

then I create a list call service list as with the following signature

List<Service> serviceList = new ArrayList<Service>

我尝试通过这样的Intent对象传递这个ArrayList

I have try to pass this ArrayList through Intent Object like this

Intent i = new Intent(Classname.this, anotherClass.class);
i.putExtras("serviceList",serviceList);
startActivity(i);

但它失败了.我通过 ArrayList 对象传递意图的方式是什么.

But it fails. What is the way I pass through intent with ArrayList object.

推荐答案

您的自定义类必须实现 Parcelable 或 Serializable 以便在一个意图.

Your custom class has to implement Parcelable or Serializable in order to serialize/de-serialize within an Intent.

你的类 Service 必须看起来像这样(使用生成器 http://www.parcelabler.com/)

Your class Service has to look like this for example (used a generator http://www.parcelabler.com/)

public class Service implements Parcelable {
private int id;
private String service_name;
private String service_code;
public Service(int id, String service_name, String service_code) {
this.id = id;
this.service_name = service_name;
this.service_code = service_code;
}


protected Service(Parcel in) {
    id = in.readInt();
    service_name = in.readString();
    service_code = in.readString();
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeInt(id);
    dest.writeString(service_name);
    dest.writeString(service_code);
}

@SuppressWarnings("unused")
public static final Parcelable.Creator<Service> CREATOR = new Parcelable.Creator<Service>() {
    @Override
    public Service createFromParcel(Parcel in) {
        return new Service(in);
    }

    @Override
    public Service[] newArray(int size) {
        return new Service[size];
    }
};

}

然后你可以使用 getIntent().getParcelableArrayListExtra() 进行转换

Then you can use getIntent().getParcelableArrayListExtra() with casting

ArrayList<Service> serviceList= intent.<Service>getParcelableArrayList("list"));

发送给你这样使用

intent.putParcelableArrayListExtra("list", yourServiceArrayList);

注意 yourServiceArrayList 应该是一个 ArrayList

Note that the yourServiceArrayList should be an ArrayList

如果是List则可以通过

if it is List the you can pass through

intent.putParcelableArrayListExtra("list", (ArrayList) yourServiceArrayList);

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