我怎样才能让我的自定义对象是Parcelable？

问题描述

我试图让我的对象是Parcelable。不过，我有自定义的对象和这些对象有我做了其他自定义对象的ArrayList属性。

I'm trying to make my objects be Parcelable. However, I have custom objects and those objects have arraylist attributes of other custom objects I have made.

什么是我能做到这一点的最好方法是什么？

What would be the best way I could do this?

推荐答案

您可以找到一些这方面的例子的，这里（code被带至此处），。

You can find some examples of this here, here (code is taken here), .

您可以创建一个POJO类，但你需要添加一些额外的code，使其Parcelable。看一看执行。

You can create a POJO class for this, but you need to add some extra code to make it Parcelable. Have a look at the implementation.

public class Student implements Parcelable{
        private String id;
        private String name;
        private String grade;

        // Constructor
        public Student(String id, String name, String grade){
            this.id = id;
            this.name = name;
            this.grade = grade;
       }
       // Getter and setter methods
       .........
       .........

       // Parcelling part
       public Student(Parcel in){
           String[] data = new String[3];

           in.readStringArray(data);
           this.id = data[0];
           this.name = data[1];
           this.grade = data[2];
       }

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

       @Override
       public void writeToParcel(Parcel dest, int flags) {
           dest.writeStringArray(new String[] {this.id,
                                               this.name,
                                               this.grade});
       }
       public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {
           public Student createFromParcel(Parcel in) {
               return new Student(in);
           }

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

一旦你创建了这个类，你可以很容易地通过这样的意图通过这个类的对象，并在目标活动中恢复这个对象。

Once you have created this class, you can easily pass objects of this class through the Intent like this, and recover this object in the target activity.

intent.putExtra("student", new Student("1","Mike","6"));

下面，学生，你将需要从束unparcel的数据的密钥。

Here, the student is the key which you would require to unparcel the data from the bundle.

Bundle data = getIntent().getExtras();
Student student = (Student) data.getParcelable("student");

这个例子只显示字符串类型。但是，你可以包裹你想要的任何类型的数据。试试吧。

This example shows only String types. But, you can parcel any kind of data you want. Try it out.

编辑：另一个例如，通过Rukmal迪亚斯建议

Another example, suggested by Rukmal Dias.

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