可打包，newArray用于什么? [英] Parcelable, what is newArray for?

问题描述

我正在实现Parcelable，以便在整个Intent中传输一些简单的数据.
但是，Parcelable接口中有一种我根本不了解的方法: newArray().
它没有任何相关文档和内容.包裹/取消包裹对象时，甚至没有在我的代码中调用它.

I am implementing Parcelable in order to transmit some simple data throughout an Intent.
However, There is one method in the Parcelable interface that I don't understand at all : newArray().
It does not have any relevant documentation & is not even called in my code when I parcel/deparcel my object.

可打包实施示例:

public class MyParcelable implements Parcelable {
 private int mData;

 public int describeContents() {
     return 0;
     }

 public void writeToParcel(Parcel out, int flags) {
     out.writeInt(mData);
     }

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

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

 private MyParcelable(Parcel in) {
     mData = in.readInt();
     }
 }  

所以，我的问题是:这种方法是做什么用的?什么时候叫?
除了在该方法中 return new MyParcelable [size]; 之外，还有什么别的意思吗?

So, my question is : what is this method for ? and when is it called ?
Is there any point in doing something else than return new MyParcelable[size]; in that method ?

推荐答案

当您尝试反序列化 Parcelable 对象的数组并对每个单个对象 createFromParcel进行序列化时，将调用此函数被调用.

this is a function to be called when you try to deserialize an array of Parcelable objects and for each single object createFromParcel is called.

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