android 实现序列化和反序列化是不同包下相同类的解决方案

将ObjectInputStream重写，防止报java.lang.ClassCastException错误，重写如下，里面要指定需要加载的那个类。

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;

public class ObjectInputStreamWithLoader extends ObjectInputStream {


    public ObjectInputStreamWithLoader(InputStream in) throws IOException {
        super(in);
    }

    /**
     * Use the given ClassLoader rather than using the system class
     */
    @SuppressWarnings("rawtypes")
    protected Class resolveClass(ObjectStreamClass classDesc) throws IOException, ClassNotFoundException {
        return com.example.testlivedata.model.Person.class;//此处是指定加载的类
    }

}

序列化和反序列化代码如下：

bt1.setOnClickListener {

            var person = Person();
            person.age = 11
            person.id = 110
            person.name = "张三"
            var objectOutputStream = ObjectOutputStream(FileOutputStream(cacheDir.path+"/p.text"))
            objectOutputStream.writeObject(person)
            objectOutputStream.close()
        }

        bt2.setOnClickListener {

            val urls = arrayOfNulls<URL>(0)

            val classLoader =
                URLClassLoader(urls, ClassLoader.getSystemClassLoader())
//            var objectInputStream = ObjectInputStream(FileInputStream(cacheDir.path+"/p.text"))
//            var person = objectInputStream.readObject() as com.example.testlivedata.model.Person
//            Log.e("sssssssssssss", person.toString())
            var objectInputStreamWithLoader =
                ObjectInputStreamWithLoader(FileInputStream(cacheDir.path + "/p.text"))
            var person =
                objectInputStreamWithLoader.readObject() as com.example.testlivedata.model.Person
            Log.e("sssssss",person.toString())
        }

Person类如下，记得需要写serialVersionUID，并且两边要一致。

import java.io.Serializable;

public class Person implements Serializable {
    private static final long serialVersionUID = -4211449776975163975L;


    private int id;
    private String name;
    private int age;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Person{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}