Parcelable

最新推荐文章于 2025-07-24 20:29:24 发布

原创最新推荐文章于 2025-07-24 20:29:24 发布 · 432 阅读

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#Android #Parcelable

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本文详细解释了如何在Android应用中通过Intent传递对象，并深入探讨了Parcelable接口的实现方式及其关键组件，包括描述内容的方法和创建对象的方法。通过示例代码，展示了如何自定义一个Parcelable类，从而在不同组件间高效地共享数据。

实现了Parcelable接口的类，可以通过Intent.putExtra(String name, Parcelable value)这个方法传递其对象。

android.os.Parcelable

Interface for classes whose instances can be written to and restored from a Parcel. Classes
implementing the Parcelable interface must also have a static field called CREATOR, which is an
object implementing the Parcelable.Creator interface.

A typical implementation of Parcelable is:

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();
     }
 }

MyParcelable demo

08-24 23:20:22.161: D/wzf(1893): MyParcelable
08-24 23:20:22.161: D/wzf(1893): writeToParcel
08-24 23:20:22.331: D/wzf(1893): createFromParcel
08-24 23:20:22.331: D/wzf(1893): private MyParcelable
08-24 23:20:22.331: D/wzf(1893): getData
08-24 23:20:22.331: D/wzf(1893): getString